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SY87700LZG - 175Mbps AnyRate CDR | Microchip Technology
SY87700LZG

SY87700LZG - 175Mbps AnyRate CDR | Microchip Technology

The Microchip Technology SY87700LZG is a 3.3 V and 5 V AnyRate clock and data recovery integrated circuit designed for serial links operating from 32 Mbps to 175 Mbps. It recovers clock and data from an NRZ data stream, generates a recovered clock, and provides one clock output in a 28-pin SOIC package. The device targets Ethernet, SONET/SDH, ATM, and other telecommunications timing applications. A clock and data recovery IC is a specialized digital timing device that restores a usable clock signal from a serial data stream whose timing relationship may vary because of line coding, transmission delay, jitter, and upstream clock uncertainty. Within the semiconductor hierarchy, the SY87700LZG belongs to the clock and timing IC family, where it combines clock recovery, clock generation, phase-locked loops, and data recovery functions for high-speed serial communication equipment. The SY87700LZG supports operation from 32 Mbps through 175 Mbps and accommodates NRZ data streams. According to the manufacturer datasheet information, the device contains two on-chip phase-locked loops: one dedicated to clock generation and another dedicated to clock recovery. Selectable operating options support 3.3 V and 5 V supply configurations, giving designers flexibility across telecommunications, networking, and industrial serial-interface systems. Its clock-recovery architecture is intended to establish stable timing between the incoming serial data and the recovered output clock. The dual-PLL arrangement separates clock generation from the recovery path, helping the IC support multiple operating rates while maintaining the timing relationship required by the host serializer or interface. The 175 Mbps upper data rate positions the part for legacy SONET/SDH, ATM, Ethernet, and other rate-specific serial links rather than modern multi-gigabit interfaces. Typical uses include SONET/SDH line-card clock recovery, ATM equipment, Ethernet serial links, telecommunications backplanes, and embedded serial timing subsystems. In these systems, the IC can reduce the burden placed on a host FPGA or ASIC by extracting a usable clock from the received NRZ stream and supplying it to downstream logic. It is most appropriate where the link rate remains within the supported 32 Mbps to 175 Mbps range. The principal design considerations are supply decoupling, data and clock input routing, and preserving a clean differential clock relationship across the PCB. Place the required input and output capacitors near their associated pins, route high-speed serial signals over continuous reference planes, and minimize stubs. Because the part combines recovered clock and serial data paths, clock jitter and board skew can affect downstream timing margin even when the nominal data rate is within specification. This product page combines the known operating rates, supply options, PLL architecture, package information, applications, and practical implementation guidance with a conservative drop-in assessment. The SY87700LZG remains the exact 28-pin SOIC ordering code, while related lower-power or different-package family members are clearly distinguished rather than presented as interchangeable drop-in parts.

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SY87700LZI - 175 Mbps AnyRate CDR | Microchip | 28-SOIC
SY87700LZI

SY87700LZI - 175 Mbps AnyRate CDR | Microchip | 28-SOIC

The Microchip Technology SY87700LZI is a 3.3 V AnyRate clock and data recovery integrated circuit for 32–175 Mbps NRZ data streams, with one recovered-clock output in a 28-pin SOIC package. It combines clock and data recovery with clock generation for Ethernet, SONET/SDH, and ATM applications, and uses two on-chip phase-locked loops to support the specified operating range. A clock and data recovery IC, commonly called a CDR, is a timing-integrity device that extracts a coherent clock from a serial data stream and regenerates data aligned to that clock. In the electronic-component hierarchy, a CDR belongs to clock and timing ICs, then to clock-data recovery and PLL-based timing conversion, and ultimately to integrated circuits used for signal integrity and network timing. This distinction from a general-purpose oscillator is important: the SY87700LZI is designed to recover timing directly from incoming NRZ data rather than merely generate a free-running reference frequency. The verified device information identifies a 3.3 V power supply, an operating data range of 32–175 Mbps, PECL input, and PECL or TTL output. The industrial temperature rating extends to +85 °C. Its two internal PLLs support clock generation and clock recovery, while its AnyRate architecture allows the recovered timing system to accommodate changing line rates through the documented operating range. The single-output organization is indicated by the distributor classification “Clock and Data Recovery (CDR), Multiplexer IC.” The SY87700LZI is intended for telecommunications and data-communication equipment where incoming serial streams must be retimed before reaching a downstream receiver, framer, or switching element. Suitable contexts include SONET/SDH line-interface equipment, ATM equipment, Ethernet-related interfaces, and optical or electrical backplanes operating within the supported 32–175 Mbps range. Its AnyRate capability can simplify designs that must support more than one standardized line rate without relying on a separate fixed-frequency clocking strategy. Design implementation requires careful attention to high-speed differential routing, PECL interface termination, supply decoupling, return paths, and output-amplitude compatibility. The manufacturer's datasheet states that input jitter tolerance is defined using the peak-to-peak sinusoidal jitter amplitude that causes an equivalent 1 dB optical or electrical power penalty; this definition should be used when evaluating system margin rather than assuming a simple bit-period budget. The 28-SOIC package also requires adequate lead spacing and assembly clearance during routing. This product data consolidates verified device specifications, source links, selection trade-offs, and application guidance beyond a raw distributor listing. It also clearly distinguishes confirmed characteristics from parameters that require confirmation in the manufacturer datasheet before schematic release, qualification, or production procurement.

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SY87700VHC - 175 Mbps AnyRate CDR | Microchip Technology
SY87700VHC

SY87700VHC - 175 Mbps AnyRate CDR | Microchip Technology

The Microchip Technology SY87700VHC is a 5 V/3.3 V AnyRate clock and data recovery integrated circuit for NRZ data streams operating from 32 Mbps to 175 Mbps. It combines clock recovery, clock generation, and multiplexing functions in a 32-pin TQFP package with an exposed pad. According to the manufacturer datasheet, the device is compatible with SONET, SDH, and ATM applications and provides 100K ECL-compatible I/O with link-fault indication. An AnyRate clock and data recovery, or CDR, is a timing-recovery integrated circuit used to extract a usable clock from a serial data stream and regenerate a synchronized output clock. A CDR belongs to the broader clock and timing IC hierarchy, where it supports communication links, network equipment, and optical-transport systems. Unlike a fixed-rate divider or basic clock buffer, the SY87700VHC can recover data across a stated 32 Mbps to 175 Mbps operating range and can also generate a clock from the same upper-rate class. The SY87700VHC supports both 5 V and 3.3 V power-supply options. Its two on-chip phase-locked loops divide the internal functions into one loop for clock generation and another for clock recovery. The available sources describe one output, while the exposed-pad TQFP package supports thermal management when the device operates continuously. Link-fault indication and ECL-compatible interfaces provide useful features for telecommunications and SONET/SDH-class designs. The architecture supports clock and data recovery from an NRZ data stream up to 175 Mbps and clock generation up to 175 Mbps. The datasheet search excerpt also identifies compliance with Bellcore, ITU/CCITT, and ANSI specifications for applications including OC-1, OC-3, FDDI, and Fast Ethernet. These protocol names describe supported legacy network and transport use cases rather than guaranteeing interoperability with every modern implementation. Typical uses include SONET/SDH equipment, ATM network interfaces, telecom line-card clocking, legacy optical transport links, and recovery paths in Ethernet-oriented equipment. The 100K ECL-compatible interface can be useful where legacy backplane logic levels are required. When using that interface, designers must confirm voltage compatibility, termination, signal integrity, and the exact operating mode against the manufacturer datasheet. For new layouts, use the 32-pin EPAD-TQFP rather than the 28-pin SOIC option that the datasheet notes is available but not recommended for new designs. Keep high-speed routing short, provide clean power and ground planes, and connect the exposed pad to the intended thermal and ground structure. Verify the exposed-pad layout and stack-up against the current Microchip package drawing before release to production. This product record consolidates the verified manufacturer and distributor information for the SY87700VHC and distinguishes documented capabilities from unavailable details. Numeric pricing, exact pin names, electrical limits, and verified drop-in replacements are not inferred when the supplied records do not provide them. It also provides practical application guidance, source links, and a structured comparison framework for engineers evaluating this legacy AnyRate CDR.

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SY87700VHH - 175Mbps AnyRate CDR | Microchip Technology
SY87700VHH

SY87700VHH - 175Mbps AnyRate CDR | Microchip Technology

The Microchip Technology SY87700VHH is a clock and data recovery IC for AnyRate serial links, operating from 32 Mbps to 175 Mbps with 3.3 V or 5 V supply support. The device provides one recovered-clock output and is packaged in a 32-pin TQFP with exposed pad, commonly identified as a 7 mm × 7 mm surface-mount package. It is intended for Ethernet, SONET/SDH, and ATM communication equipment. A clock and data recovery IC, or CDR, is a timing-recovery integrated circuit that reconstructs a synchronized clock from an incoming serial data stream. It belongs to the clock and timing IC hierarchy, where phase-locked-loop and voltage-controlled-oscillator techniques support high-speed data recovery. In a communications receiver, the recovered clock establishes the timing reference needed to sample incoming data reliably. The SY87700VHH supports data rates across the 32 Mbps to 175 Mbps range, making it suitable for legacy packet transport and telecom interfaces operating within that span. Its 3.3 V and 5 V supply options provide flexibility across different receiver architectures. The single recovered-clock output simplifies designs requiring one timing channel, while the exposed-pad TQFP package supports surface-mount assembly and board-level thermal management. Internally, the recovery loop compares the phase relationship between data-edge transitions and generated-clock transitions. A phase-and-frequency detector produces correction pulses, an integral loop filter smooths those pulses, and a voltage-controlled oscillator generates the adjusted clock. This closed-loop arrangement allows the output clock to track the timing of the incoming serial data rather than operating as an independent free-running source. Typical applications include Ethernet line-card receivers, SONET/SDH interface equipment, ATM networking systems, optical-network terminals, and other telecommunications products using serial links in the supported data-rate range. System designers should also account for the selected reference clock, loop-filter components, supply decoupling, and the exposed thermal pad when developing a production board. For layout, place input, reference-clock, and supply bypass connections close to their associated pins, while preserving controlled return paths for high-speed inputs. Treat the exposed pad as a thermal and electrical structure rather than an unused lead. Verify the timing budget, jitter performance, acquisition behavior, and loop-filter values against the manufacturer datasheet before fixing system clock tolerances. This page consolidates the identified operating range, package information, application roles, sourcing guidance, and design considerations into an engineering-oriented overview. It also distinguishes direct same-family options from unsupported cross-package substitutions so engineers can assess replacement choices without changing the board footprint.

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SY87700VSC - 175Mbps CDR | Microchip Technology
SY87700VSC

SY87700VSC - 175Mbps CDR | Microchip Technology

The Microchip Technology SY87700VSC is an AnyRate clock and data recovery IC for Ethernet, SONET/SDH, and ATM equipment, operating at data rates from 32 Mbps to 175 Mbps with one recovered-clock output in a 28-pin SOIC exposed-pad package. The device supports 3.3 V and 5 V operation and uses differential PECL inputs and outputs. A clock and data recovery IC, or CDR, belongs to the clock and timing IC family within application-specific clock and timing semiconductors. It extracts a usable clock from a serialized data stream and can also recover or retime data when the system requires a cleaner relationship between clock and data. In telecommunications equipment, this function supports synchronization across high-speed network interfaces. The SY87700VSC supports data rates of 32 Mbps through 175 Mbps, making it applicable to legacy and emerging SONET/SDH, ATM, and Ethernet transport paths. Its 3.3 V and 5 V operating capability provides supply-voltage flexibility, while the differential PECL interface supports high-speed, noise-sensitive transmission links. The device is identified as a phase-locked-loop clock and data recovery product in the supplied cross-reference data. The integrated PLL architecture recovers timing information and establishes the relationship between the incoming serial stream and the recovered output. According to the manufacturer datasheet, the PLL complies with the proposed SONET/SDH jitter specifications in Bellcore GR-253-CORE, Issue 2, December 1995 and ITU-T Recommendation G.958 when used with differential inputs and outputs. Those standards appear directly in the supplied datasheet source. Typical deployments include SONET/SDH line-interface equipment, ATM switching and transmission systems, Ethernet network-interface modules, and telecommunications line cards. The 175 Mbps upper rate and one-output configuration are particularly relevant to designs that need recovered timing for an optical or copper transmission section rather than a general-purpose multi-channel clock synthesizer. Designers should preserve the differential input and output topology specified by the manufacturer and validate transmission-line impedance, termination, and jitter performance in the final board environment. The exposed-pad package also requires careful thermal and layout treatment so that heat is transferred through the pad and ground-plane area rather than concentrated beneath the device. This page consolidates the verified 175 Mbps, 32 Mbps to 175 Mbps, 3.3 V/5 V, differential PECL, package, application, and standards information into an engineering-oriented product record. It also distinguishes verified characteristics from unspecified electrical details and avoids presenting unavailable pricing or pin data as confirmed facts.

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SY87700VZC - 175Mbps AnyRate CDR | Microchip Technology
SY87700VZC

SY87700VZC - 175Mbps AnyRate CDR | Microchip Technology

The Microchip Technology SY87700VZC is a 175 Mbps AnyRate clock and data recovery integrated circuit designed for Ethernet, SONET/SDH, and ATM applications. It supports 3.3 V and 5 V operation, accepts PECL input, and is housed in a 28-pin SOIC package measuring 7.50 mm wide. The device combines clock recovery, data recovery, and multiplexing functions for high-speed telecommunications and networking equipment. A clock and data recovery IC is a timing IC that extracts a coherent clock from a serial data stream and reconstructs data whose timing has degraded due to noise, jitter, or transmission losses. CDR devices belong to the clock and timing IC hierarchy and ultimately support synchronization in networking, optical transport, and digital communications systems. The SY87700VZC is an application-specific timing solution rather than a general-purpose fixed-frequency oscillator. The verified operating envelope includes data rates from 32 Mbps to 175 Mbps and operation from a 3.3 V or 5 V supply. Its AnyRate architecture supports a broad range of line rates, making it useful when one board design must accommodate multiple standardized transmission rates. The recovered clock and data outputs reduce the external circuitry needed to implement a compliant telecom or network interface. The SY87700VZC includes a phase-locked loop, as identified in the published specification data, and provides one recovered output. It is intended for SONET/SDH, ATM, and Ethernet systems where incoming serial data must be clocked and recovered before downstream processing. Input signaling is identified as PECL, which requires appropriate interface termination and level translation where the surrounding system uses another logic family. Typical deployments include SONET/SDH line cards, ATM switching equipment, optical transport modules, Ethernet backplane links, and telecommunications aggregation systems. A design can place the CDR between a high-speed serial receiver and the system's parallel processing or forwarding circuitry. Its 175 Mbps maximum rate supports legacy and intermediate-rate telecom links while its 28-pin SOIC package simplifies assembly on conventional surface-mount boards. The primary design consideration is verifying the complete signal environment. Board designers must accommodate the device's PECL input interface, provide suitable termination, maintain controlled routing for high-speed signals, and observe all supply and decoupling requirements in the manufacturer datasheet. Because the verified search data does not provide the complete electrical table or pin assignment, engineers should confirm those details before schematic capture or layout release. This page consolidates the verified distributor inventory information, AnyRate operating range, package details, and same-package family references into an engineering-focused comparison. It also distinguishes confirmed specifications from values that still require direct confirmation from the manufacturer datasheet.

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SY87700VZH - 175Mbps AnyRate CDR | Microchip Technology
SY87700VZH

SY87700VZH - 175Mbps AnyRate CDR | Microchip Technology

The Microchip Technology SY87700VZH is an AnyRate clock and data recovery integrated circuit for telecommunications and networking equipment, supporting clock generation and clock recovery from 32 Mbps to 175 Mbps with a single output. It operates from a 3.3 V or 5 V supply and is packaged in a 28-pin SOIC for surface-mount assembly. A clock and data recovery IC is a timing-control semiconductor that reconstructs a usable clock from an incoming serial data stream or generates a synchronized reference clock. The SY87700VZH belongs to the clock and timing IC hierarchy, where phase-locked loops support stable reference generation, clock multiplication, and recovery in SONET/SDH, ATM, Ethernet, and related serial-interface systems. Its AnyRate architecture is useful where the interface rate can vary rather than remaining fixed at one nominal speed. Key features include support for 3.3 V and 5 V power-supply options, NRZ data recovery through 175 Mbps, and clock generation through 175 Mbps. Two on-chip phase-locked loops provide separate clock-generation and clock-recovery functions. The device is designed for SONET/SDH and ATM-compatible interfaces and provides one recovered or generated clock output. Its 28-SOIC package supports conventional PCB assembly and thermal management without a fine-pitch BGA footprint. The two-loop architecture separates reference synthesis from data recovery, allowing one PLL to establish the nominal clock relationship while the other tracks phase variation in the incoming serial stream. This structure supports flexible AnyRate operation while reducing the external circuitry needed for clock generation, jitter control, and data-to-clock alignment in communications equipment. Typical applications include telecommunications line interfaces, SONET/SDH equipment, ATM interfaces, Ethernet system timing, and high-speed network backplane clocking. It is particularly relevant when a board must recover timing from an NRZ stream or produce a clock at a rate selected by the system configuration. The single-output architecture should be matched against the number of clocks required by the target board. For implementation, follow the pin-description table and reference circuit in the manufacturer datasheet, especially for reference-clock connections, PLL loop filters, and supply decoupling. PCB signal integrity is critical because jitter and phase noise at the recovered output depend on trace geometry, grounding, and isolation between high-speed clock paths and surrounding digital circuitry. This page combines the operating limits, package information, application guidance, comparison criteria, and practical design considerations needed to evaluate the SY87700VZH for a clock-and-data-recovery design. It also identifies the distinctions that matter when comparing same-family options or planning a replacement program.

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SY87701LHG - 1.25Gbps Any-Rate CDR | Microchip
SY87701LHG

SY87701LHG - 1.25Gbps Any-Rate CDR | Microchip

Microchip SY87701LHG is a 1.25 Gbps AnyRate clock and data recovery integrated circuit with one recovered output, optimized for 3.3 V systems and packaged in a 32-pin TQFP with exposed pad. The device supports clock and data recovery from data streams up to 1.25 Gbps and clock generation up to the same maximum rate, positioning it between general-purpose clock buffers and application-specific SONET/SDH, ATM, and Ethernet interface circuits. An AnyRate clock and data recovery, or CDR, IC is a timing-integrity component that extracts or reconstructs a usable clock from a serial data stream. It belongs to the clock and timing IC hierarchy, which includes clock buffers, clock generators, phase-locked loops, jitter attenuators, multiplexers, and data-recovery circuits. CDRs are particularly important where serial transmission introduces timing uncertainty, duty-cycle distortion, or inconsistent edge relationships that would otherwise impair receiver sampling. Key verified capabilities include operation from 32 Mbps to 1.25 Gbps, a single recovered output, a 3.3 V supply option, and use in Ethernet, SONET/SDH, and ATM equipment. A second search result describes the family as supporting both 5 V and 3.3 V supply options, while the exact SY87701LHG distributor listing identifies the offered device as the 3.3 V version. The product also supports clock generation in addition to recovery, allowing it to address transmit, receive, and network timing functions. The SY87701LHG is intended for communication systems where a 32-pin TQFP-EP package offers a practical balance between routing access, thermal performance, and assembly complexity. The exposed pad improves heat transfer from the integrated circuit to the PCB, but designers still need to follow the manufacturer's land-pattern and thermal-via requirements. Its AnyRate architecture is useful when one component must accommodate multiple line rates rather than requiring a separate fixed-rate recovery device for each operating mode. Typical application areas include Ethernet line-card and switching equipment, SONET/SDH transport systems, ATM network interfaces, and other serial communication platforms. These environments benefit from synchronized clocking, recovered data outputs, and clock generation from the same timing subsystem. The part may also support telecommunications backplanes and legacy data-communication equipment where NRZ serial links operate at rates through 1.25 Gbps. Designers should confirm signal integrity, loopback behavior, input/output timing, and supply requirements against the manufacturer datasheet before production release. PCB layout should provide a continuous return path, place decoupling capacitors close to the supply pins, and connect the exposed thermal pad to an appropriately sized ground or thermal copper plane according to the recommended land pattern. This page consolidates verified distributor specifications, sourcing information, application context, and package-specific guidance. It also distinguishes the confirmed tape-and-reel ordering code from the base device and clearly identifies the limited number of verified drop-in alternatives rather than presenting unverified substitutes as drop-in replacements.

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SY87701LHI - 1.25Gbps AnyRate CDR | Microchip Technology
SY87701LHI

SY87701LHI - 1.25Gbps AnyRate CDR | Microchip Technology

Microchip Technology SY87701LHI is a 3.3 V AnyRate clock and data recovery (CDR) integrated circuit designed for data rates from 32 Mbps to 1.25 Gbps, packaged in a 32-pin TQFP with an exposed pad. It recovers clock and data from NRZ data streams and generates clock signals from data as high as 1.25 Gbps, making it suitable for telecommunications timing, SONET/SDH, ATM, and other high-speed serial interfaces. A clock and data recovery IC is a timing subsystem that extracts a usable serial clock from an incoming data stream and aligns recovered data with that clock. Within the broader semiconductor hierarchy, the SY87701LHI is an integrated circuit, a clock and timing device, and a CDR. Its AnyRate architecture supports multiple line rates through one clock-recovery solution, reducing the need for separate recovery devices in multi-rate systems. Key verified characteristics include a 3.3 V power supply, an operating data-rate range of 32 Mbps to 1.25 Gbps, NRZ data recovery, and clock generation from a 1.25 Gbps stream. The device also provides an industrial-temperature option, according to the retrieved product documentation. The manufacturer documentation states that the PLL complies with the proposed jitter specifications for SONET/SDH equipment in Bellcore Specifications GR-253-CORE, Issue 2, December 1995 and ITU-T Recommendation G.958 when used with differential inputs and outputs. The device is intended for telecommunications equipment operating at OC-3, OC-12, and related serial-data rates. Its differential interface architecture and integrated clock-recovery function make it relevant to line cards, optical interface modules, SONET/SDH terminal equipment, ATM equipment, and other designs requiring synchronized NRZ data transfer. The exposed-pad TQFP construction also requires attention to thermal dissipation and PCB thermal design. A key design consideration is that the SY87701LHI is a high-speed timing device rather than a general-purpose logic IC. Differential routing, controlled impedance, solid reference planes, short return paths, and careful decoupling are essential for predictable signal integrity. The application circuit and pin assignments should be taken directly from the manufacturer datasheet, including the exposed-pad connection and differential input or output requirements. This product page consolidates the verified 3.3 V supply, 32 Mbps to 1.25 Gbps AnyRate operation, package information, timing-standard references, sourcing links, and practical integration guidance. Pin-level details not exposed in the supplied search evidence are intentionally left unspecified rather than inferred, allowing engineers to download the manufacturer PDF before layout or schematic release.

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SY87701LSI - 1.25Gbps Clock Data Recovery IC | Microchip
SY87701LSI

SY87701LSI - 1.25Gbps Clock Data Recovery IC | Microchip

Microchip SY87701LSI is a 3.3 V clock and data recovery (CDR) integrated circuit designed for protocol-independent recovery of serial data from 32 Mbps to 1.25 Gbps. The device combines clock and data recovery functions in a 28-lead SOIC package, making it suitable for high-speed telecommunications, networking, storage, and backplane interfaces. Its principal advantages are protocol independence, operation from a 3.3 V supply, and support for data rates extending to 1.25 Gbps. A clock and data recovery IC is a timing-integrity device that reconstructs a usable clock from a combined or separated serial-data stream. In the broader semiconductor hierarchy, a CDR is a clock-and-timing IC used to recover timing information corrupted by noise, jitter, propagation delay, and bandwidth loss. The SY87701 family therefore occupies the interface between high-speed serial communication and the clock-generation circuitry required by transmitters, receivers, serializers, and deserializers. The verified source information identifies the SY87701 as an AnyRate CDR operating from 32 Mbps to 1.25 Gbps at 3.3 V. AnyRate operation allows the same device to serve multiple link rates without changing the external data rate, which can simplify qualification inventories for equipment supporting more than one serial interface. The SY87701LSI orderable variant is listed with an advanced 28-lead SOIC package, although separate distributor snippets inconsistently describe the family with other package configurations. Protocol independence is the most important architectural feature for engineers evaluating this part. Instead of imposing a fixed encoding or transport protocol, the recovery circuitry is intended to work across compatible serial links. In a receive path, the recovered clock can provide a timing reference for subsequent deserialization or digital processing. Design work still requires checking the specific protocol, jitter tolerance, reference-clock requirements, input sensitivity, output characteristics, and board-level constraints in the manufacturer datasheet before release to production. Typical uses include telecom line cards, router and switch interfaces, optical-network equipment, backplane links, clock-generation subsystems, and high-speed test equipment. The device may be especially relevant where a 32 Mbps-to-1.25 Gbps AnyRate range is useful across a family of products. Designers should account for high-speed transmission-line behavior, controlled impedance, receiver sensitivity, reference-clock jitter, and connector or package parasitics when laying out the PCB. A critical design consideration is that distributor package descriptions are not fully consistent for the SY87701 family. The available source identifies SY87701LSI as a 28-lead SOIC variant, while other family listings mention a 32-pin TQFP. Confirm the exact mechanical drawing, pin numbering, exposed-pad requirements, and exposed pad status directly against the manufacturer documentation before ordering or substituting any related MPN. This page consolidates the verified Microchip family data, distributor availability information, sourcing links, and engineering guidance into one component record. It also distinguishes confirmed attributes from parameters that still require the manufacturer datasheet, helping engineers evaluate SY87701LSI without treating incomplete distributor descriptions as verified specifications.

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SY87701LZG - 1.25Gbps AnyRate CDR | Microchip | 28-SOIC
SY87701LZG

SY87701LZG - 1.25Gbps AnyRate CDR | Microchip | 28-SOIC

The Microchip Technology SY87701LZG is a 3.3 V clock and data recovery (CDR) integrated circuit designed for serial data rates from 32 Mbps to 1.25 Gbps. It supports NRZ data streams, provides one recovered-clock output, and is packaged in a 28-pin SOIC. The device is intended for high-speed telecom, Ethernet, SONET/SDH, ATM, FDDI, and related optical-network interface applications. A clock and data recovery integrated circuit is a timing-recovery semiconductor that extracts a usable clock from a serial data stream and aligns recovered timing with the incoming data. The CDR belongs to the clock and timing IC hierarchy, where it complements clock generators, buffers, phase-locked loops, and other clock-management circuitry used in telecommunications and digital data links. The SY87701LZG operates from a 3.3 V power supply and recovers clock and data from serial NRZ streams spanning 32 Mbps to 1.25 Gbps. Its AnyRate operating concept allows one clock-and-data recovery function to serve a broad range of line rates. The device includes one clock output according to the product classification for the 28-SOIC package. The core engineering value of the SY87701LZG is interface consolidation. Combining clock recovery with data handling in one dedicated IC can reduce the number of separate timing components required around a high-speed serial transceiver. Its stated compliance with Bellcore, ITU/CCITT, and ANSI specifications supports use in telecom-oriented designs, including OC-3, OC-12, ATM, and FDDI applications. Typical uses include SONET/SDH line interfaces, ATM equipment, Ethernet links, FDDI systems, and other optical-transport paths operating up to 1.25 Gbps. The device is particularly relevant where the receiver must reconstruct timing from an incoming NRZ stream rather than relying on a separate source-synchronous clock. Design work should center on signal integrity, supply decoupling, input/output termination, and correct implementation of the manufacturer's reference interface. Because this is a high-speed timing device, trace geometry, return paths, connector transitions, and ground-plane continuity can materially affect recovered-clock quality even when the nominal data rate is within specification. This page consolidates the device classification, supported data-rate range, voltage, package, application coverage, verified sourcing links, and engineering guidance into one reference for evaluating the SY87701LZG in clock-and-data-recovery designs.

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SY87701LZI - 3.3V 1.25Gbps AnyRate CDR | Microchip Technology
SY87701LZI

SY87701LZI - 3.3V 1.25Gbps AnyRate CDR | Microchip Technology

The Microchip Technology SY87701LZI is a 3.3V AnyRate clock and data recovery IC for NRZ data streams operating from 32Mbps to 1.25Gbps, housed in a 28-pin SOIC package. The device performs clock and data recovery from data streams up to 1.25Gbps and generates a recovered clock up to 1.25Gbps, making it suitable for telecommunications and synchronous digital data links. An AnyRate clock and data recovery IC is a timing-recovery component that extracts a usable clock from a serial data stream and retimes the associated data. Its position within the broader semiconductor hierarchy is clock and timing IC → clock and data recovery IC → integrated circuit → semiconductor. The technology is intended for systems where the transmitting clock is not separately available at the receiver or where accumulated timing drift must be continuously corrected. The verified specifications identify a 3.3V power supply, an operating data-rate range of 32Mbps to 1.25Gbps, and recovery-clock generation up to 1.25Gbps. The SY87701LZI also has an industrial temperature-range option, according to the Micrel datasheet information included in the search results. These characteristics make the device relevant to telecom backplane links, optical transport systems and other high-speed serial interfaces operating with NRZ-coded data. The Micrel device is described as complying with Bellcore, ITU/CCITT and ANSI specifications for applications such as OC-3 and OC-12. It supports clock and data recovery directly from an NRZ data stream, reducing the need for separate source-synchronous clocking across long or timing-sensitive interconnects. Exact architecture details, loop bandwidth, input sensitivity, jitter tolerance, supply-current limits and pin-level signal definitions are not available in the supplied verified records and therefore require confirmation from the manufacturer datasheet. Typical applications include SONET or optical-transport equipment, telecom line cards, high-speed backplanes and serial data links requiring recovered clock and data outputs. In an OC-3-class interface, its 1.25Gbps maximum recovery rate provides operating margin above the nominal line rate. In a lower-rate telecom or proprietary serial link, the 32Mbps lower limit allows one device family to cover multiple interface rates when the surrounding system supports the required encoding and reference-clock architecture. Designers should confirm the exact pin assignment, reference-clock requirements, input and output logic levels, jitter characteristics and recommended decoupling directly from the Micrel datasheet before layout. The 28-SOIC footprint requires careful high-speed routing, short return paths and controlled impedance. Input and output timing must be evaluated for the target data rate because compliance claims alone do not replace board-level signal-integrity validation. This page consolidates the verified distributor price, availability, package information and core SY87701LZI specifications, then adds practical sourcing, selection and implementation guidance. It also distinguishes verified facts from parameters that still require manufacturer confirmation, helping engineers avoid treating search-result summaries as a substitute for the complete datasheet.

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SY87701VHC - 1.25Gbps AnyRate CDR | Microchip Technology
SY87701VHC

SY87701VHC - 1.25Gbps AnyRate CDR | Microchip Technology

The Microchip Technology SY87701VHC is an AnyRate clock and data recovery multiplexer IC that supports NRZ data rates from 32 Mbps to 1.25 Gbps in a 32-pin TQFP exposed-pad package. It accepts 3.3 V or 5 V supply configurations, supports PECL or TTL inputs, and provides a PECL output for Ethernet, SONET/SDH, ATM, Fibre Channel, and other high-speed communication systems. A clock and data recovery IC, or CDR, is a specialized timing integrated circuit that extracts or regenerates a serial clock from a high-speed data stream and aligns the recovered data for downstream processing. The SY87701VHC belongs to the clock and timing IC hierarchy, where it combines clock recovery, data retiming, and multiplexing functions. Its AnyRate operating concept allows one circuit to serve multiple line rates rather than requiring a separate fixed-rate recovery device. Key features include support for 32 Mbps through 1.25 Gbps NRZ data, a maximum operating frequency of 1.25 Gbps, 3.3 V and 5 V power-supply options, and PECL or TTL input compatibility. The recovered clock can operate at up to 1.25 Gbps, while the PECL output is suitable for high-speed optical, ATM, SONET/SDH, and Fibre Channel interfaces. The exposed pad supports improved thermal performance on a 7 mm × 7 mm surface-mount package. The SY87701VHC integrates a phase-locked-loop-based clock recovery architecture with clock and data multiplexing functions. This architecture allows a shared source to feed the device while the internal recovery and multiplexing paths support high-speed serial links. Its dual input and output logic families make it useful when a board must interface between TTL/CMOS-style digital sources and ECL-family PECL links, although input levels, termination, and supply voltage must be verified against the manufacturer datasheet. Typical applications include 1.25 Gbps Fibre Channel equipment, ATM switching systems, SONET/SDH line interfaces, Ethernet transmission equipment, and other recovered-clock or retimed-data designs. The device is most appropriate where a designer needs multiple supported rates, direct clock recovery, and a multiplexed high-speed output within one communication subsystem. A critical design consideration is that high-speed PECL and TTL interfaces require controlled impedance routing, correct reference-plane return paths, and carefully placed termination. Power and ground distribution must also be designed to limit disturbance from the clock recovery circuitry. Before layout, engineers should confirm the exact pin assignment, differential clock requirements, input thresholds, and exposed-pad connection details in the manufacturer datasheet. This page consolidates the verified distributor specifications, source links, package information, pricing status, application guidance, and data limitations for SY87701VHC. It also distinguishes verified facts from parameters that still require confirmation from the manufacturer datasheet, helping engineers evaluate the IC without relying on unverified substitute parts.

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SY87701VHH - 1.25Gbps Clock Recovery IC | Microchip
SY87701VHH

SY87701VHH - 1.25Gbps Clock Recovery IC | Microchip

The Microchip Technology SY87701VHH is a 1.25 Gbps clock and data recovery (CDR) multiplexer IC designed for Ethernet, SONET/SDH, and ATM applications. It operates from a 3.3 V or 5 V supply, provides one recovered-clock output, and is packaged in a 32-pin TQFP with exposed pad (EP) measuring 7 mm by 7 mm. Its core function is to recover a usable clock from an incoming serial NRZ data stream while supporting clock generation and link-failure behavior. A clock and data recovery IC is a specialized timing-control device within the clock and timing IC hierarchy. It extracts timing information from a serial data stream, regenerates a stable clock, and can retime data when the receiving system requires deterministic edge placement. In optical and packet-network equipment, this function supports line-card receivers, multiplexers, test equipment, and other interfaces operating at high serial-data rates. According to the Microchip SY87701V datasheet, the device supports data rates from 32 Mbps to 1.25 Gbps. This range allows one circuit to serve multiple transport and networking formats, including OC-3, OC-12, ATM, and FDDI-related applications cited in the technical documentation. The integrated link fault indication circuit monitors the integrity of the serial inputs and forces the PLL to lock to the local reference clock when the received data fails the frequency test. Internally, the SY87701V combines clock recovery, data retiming, and multiplexing functions. The recovered output can maintain the correct output frequency during loss-of-signal or loss-of-lock conditions by referring to the local reference. This behavior helps downstream logic continue operating deterministically while the link is impaired, although system fault management must still detect and report the failed link through the indication circuitry. Typical uses include telecommunications line cards, ATM and SONET/SDH transport equipment, Ethernet interface assemblies, optical-network test systems, and clock-generation subsystems. The device is particularly relevant when a board must recover timing from an NRZ stream while maintaining a predictable reference-clock relationship during link transitions. The main PCB-design consideration is the exposed-pad thermal and electrical interface. The 7 mm by 7 mm TQFP-EP package requires its exposed pad to be connected to the intended ground plane and soldered according to the package land pattern. High-speed data and clock traces should also follow the layout guidance in the manufacturer datasheet to limit reflections and preserve timing margin. This page combines the manufacturer datasheet information with package details, application guidance, and the documented link-recovery behavior of the SY87701VHH. It also distinguishes the directly replaceable SY87701VHC from the broader clock-recovery design choices, helping engineers evaluate footprint compatibility, data-rate suitability, and recovery behavior before committing a board revision.

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SY87701VSC - 1.25 Gbps Clock/Data Recovery IC | Microchip
SY87701VSC

SY87701VSC - 1.25 Gbps Clock/Data Recovery IC | Microchip

Microchip Technology SY87701VSC is a protocol-independent clock and data recovery IC designed to recover clock and data signals at data rates from 32 Mbps to 1.25 Gbps. The device is supplied in a 32-pin TQFP package with an exposed pad and is intended for Ethernet, SONET/SDH, and ATM signal-chain applications. Its principal functions are parallel-to-serial conversion, clock and data recovery, multiplexing, and serializer output. A clock and data recovery IC, commonly abbreviated CDR, belongs to the clock-and-timing IC hierarchy and provides the timing reference needed by high-speed serial links. Unlike a receiver that only detects transitions, a CDR extracts or reconstructs a usable clock from a serial data stream and aligns recovered data with that clock. The SY87701 therefore supports systems that need deterministic timing, serial-to-parallel or parallel-to-serial conversion, and multiplexing between high-speed data paths. The manufacturer datasheet identifies the SY87701 as a protocol-independent CDR capable of operation through 1.25 Gbps. It is associated with Ethernet, SONET/SDH, and ATM applications, allowing the same device family to address multiple telecommunications and networking signal formats. The 32-TQFP exposed-pad package provides a defined PCB footprint and a central thermal connection for power handling and ground-plane connection. Its clock and data recovery architecture separates the device from generic fixed-format transceivers. Protocol independence allows the surrounding system to establish the required framing and encoding, while the CDR handles the critical task of maintaining clock-to-data alignment. At high data rates, this alignment directly affects whether the receiver can distinguish valid data from timing uncertainty and transition noise. Typical implementation areas include Ethernet line interfaces, SONET/SDH transport equipment, ATM networking systems, optical-module signal paths, and test equipment that reproduces high-speed serial links. The device can be especially relevant where a parallel source must be serialized or where a received serial stream must be converted into a parallel bus for downstream digital processing. When laying out a board for the SY87701VSC, preserve the manufacturer's recommended high-speed differential and bypass-connection topology. Keep the exposed pad tied to the designated ground plane, place input and output decoupling capacitors close to their associated pins, and maintain controlled impedance on high-speed signal routes. Differential routing symmetry and short return paths are important because even small timing skew can reduce margin at 1.25 Gbps. This product record combines the verified device classification, speed, package, and application information with engineering guidance for footprint reuse, high-speed layout, thermal implementation, and replacement assessment. It also distinguishes verified drop-in replacements from generic functional substitutes, helping engineers confirm pin-level and parameter-level compatibility before modifying a production design.

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SY87701VZC - 1.25Gbps AnyRate CDR | Microchip | SONET
SY87701VZC

SY87701VZC - 1.25Gbps AnyRate CDR | Microchip | SONET

The Microchip Technology SY87701VZC is a clock and data recovery IC with a multiplexer function, designed for data rates from 32 Mbps to 1.25 Gbps. It supports 3.3 V and 5 V supply options, accepts PECL input, includes a PLL, and provides one clock output in a 28-pin SOIC package. The device targets Ethernet, SONET/SDH, ATM, FDDI, and Fibre Channel network-interface applications. A clock and data recovery IC is a specialized timing IC that reconstructs a synchronized clock from a serial data stream and removes timing distortion introduced by transmission lines, connectors, and other circuit elements. In the broader semiconductor hierarchy, the SY87701VZC belongs to the clock and timing IC class, where it combines phase-locked-loop technology, data recovery, and multiplexing functions for high-speed serial communication equipment. Key features include AnyRate operation from 32 Mbps through 1.25 Gbps, support for both 3.3 V and 5 V power-supply options, one recovered-clock output, and a PECL input interface. The manufacturer datasheet identifies the device as suitable for Bellcore, ITU/CCITT, and ANSI-based telecom specifications, including OC-3, OC-12, ATM, FDDI, and Fibre Channel interfaces. Its 28-pin SOIC construction supports conventional surface-mount assembly. The internal PLL allows the circuit to derive a stable clock relationship from the incoming high-speed stream rather than relying on a separate fixed-frequency source. In an AnyRate implementation, the recovery function must maintain alignment across a broad range of line rates, making the SY87701VZC appropriate for network interfaces, telecom backplanes, and legacy optical-network equipment. PECL signal levels provide a high-speed differential-style logic environment commonly used in telecom and data-communication systems. Typical applications include OC-3 and OC-12 SONET/SDH interfaces, ATM equipment, Ethernet network interfaces, FDDI links, and Fibre Channel transceivers. The 1.25 Gbps upper rate aligns with widely deployed Gigabit-class transport links, while the lower operating range allows the same recovery architecture to address slower network streams. Designers should verify input logic thresholds, output interface levels, supply sequencing, reference-component values, and loop bandwidth against the manufacturer application circuit before releasing a PCB. Differential signal routing, short return paths, controlled-impedance geometry, and separation from high-current switching circuitry are especially important when recovering timing from marginal data signals. This page organizes the manufacturer datasheet characteristics, sourcing information, application guidance, design cautions, and verified replacement status into a compact engineering reference. It also distinguishes a true pin-compatible replacement from devices that are merely functionally similar, helping PCB designers avoid unnecessary respins or signal-integrity changes.

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SY87701VZH - 1.25Gbps AnyRate CDR | Microchip Technology
SY87701VZH

SY87701VZH - 1.25Gbps AnyRate CDR | Microchip Technology

The Microchip Technology SY87701VZH is an AnyRate clock and data recovery IC for 32 Mbps to 1.25 Gbps NRZ data streams, offered in a 28-pin SOIC package with 3.3 V and 5 V power-supply options. It provides one recovered clock output and supports clock generation as well as clock and data recovery for Ethernet, SONET/SDH, and ATM equipment. A clock and data recovery IC is a timing IC that reconstructs a usable clock from a serial data stream whose original clock has become embedded in the data or has otherwise become unusable. In the broader semiconductor hierarchy, a CDR belongs to clock and timing ICs, which support communication ICs and network infrastructure equipment. The SY87701 is designed for protocol-independent recovery over a broad speed range rather than one fixed line rate. The primary operating range is 32 Mbps to 1.25 Gbps using NRZ signaling. The device can recover clock and data or generate clock from a suitable input stream, giving system designers flexibility across optical, serial-network, and test-equipment signal paths. Its 3.3 V and 5 V supply options broaden its use across communications equipment, while the single recovered-clock output provides a straightforward clock-recovery function. The SY87701 family is associated with Bellcore, ITU/CCITT, and ANSI applications including OC-3, OC-12, ATM, and FDDI environments. These references describe the communications standards and legacy transport systems addressed by the device; they do not imply that every downstream equipment design automatically meets a complete compliance specification. System designers must still control the source, data path, jitter tolerance, and output interface. Typical uses include Ethernet line cards, SONET/SDH transport modules, ATM equipment, clock-recovery modules, and instrumentation that accepts NRZ serial data. In these systems, the recovered clock can provide a timing reference for deserializers, controllers, or downstream digital logic. Its AnyRate capability is especially useful when a product family must support several standardized line rates with one clock-recovery device. Designers should preserve the differential data and clock topology recommended by the manufacturer datasheet, provide clean return paths, and validate timing margins across the complete 32 Mbps to 1.25 Gbps range. Input amplitude, jitter, duty-cycle distortion, and board loss can constrain usable margin even when the nominal data-rate range is supported. This product page combines verified manufacturer and distributor information with package, sourcing, application, and design guidance. It also distinguishes the tube-packaged SY87701VZH from related ordering information and documents the limits of the available substitute and compliance data rather than inferring unverified drop-in replacements.

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SY87702LHI - 2.5Gbps AnyRate CDR Multiplexer | Microchip Technology
SY87702LHI

SY87702LHI - 2.5Gbps AnyRate CDR Multiplexer | Microchip Technology

The Microchip Technology SY87702LHI is a 3.3 V AnyRate clock and data recovery (CDR) multiplexer IC supporting data rates from 28 Mbps to 2.5 Gbps in a 64-TQFP exposed-pad package. It combines clock and data recovery with an integrated multiplexer and provides differential PECL inputs and outputs together with CML outputs for high-speed communications. A clock and data recovery IC is a timing-integrity component that reconstructs a synchronous clock from a serialized data stream. In the signal hierarchy, a CDR supports the clock and timing IC family, which belongs to broader digital and mixed-signal semiconductor systems. Recovering clock and data together helps a receiver establish the timing relationship required to process high-speed serial links accurately. The SY87702LHI supports operation across a broad 28 Mbps to 2.5 Gbps range. Its 3.3 V supply operation suits modern communications equipment, while differential PECL and CML interfaces support high-speed point-to-point links. The integrated multiplexer reduces the number of separate timing and routing components required in systems that must handle multiple data paths. The device has one recovered output according to its distributor product classification. The device is associated with Ethernet, SONET/SDH, and ATM applications, and its architecture also supports bandwidth-sensitive infrastructure such as Fibre Channel and Gigabit Ethernet. Differential signaling helps transmit clock and data information across a controlled-impedance board environment. CML outputs provide an additional interface choice for designs using compatible high-speed receivers and termination networks. The 64-TQFP-EP package provides 64 signal pins plus an exposed thermal pad. It is a surface-mount solution suitable for multilayer PCB construction, although exposed-pad layout and thermal management must follow the package requirements. Care is especially important because high-speed differential routing, controlled impedance, short return paths, and proper decoupling materially affect signal integrity. When designing around the SY87702LHI, begin by confirming that the selected data rate, interface voltage levels, reference-clock arrangement, and recovery mode match the system requirements. Preserve the differential-impedance geometry specified by the manufacturer and provide low-inductance connections from the power and ground pins to the decoupling network. Verify timing margins and loss budget at the intended signaling rate. This product overview combines the SY87702LHI operating characteristics with application guidance, package details, interface considerations, and replacement guidance. It is intended to help engineers identify where the 3.3 V, 2.5 Gbps AnyRate architecture fits and which design parameters must be checked before committing the device to a high-speed PCB layout.

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SY87721LHG - 2.7Gbps AnyRate CDR | Microchip Technology
SY87721LHG

SY87721LHG - 2.7Gbps AnyRate CDR | Microchip Technology

The Microchip Technology SY87721LHG is a 3.3 V AnyRate clock and data recovery unit with an integrated clock multiplier, designed to recover data and clock from signals operating from 28 Mbps to 2.7 Gbps. The device provides one recovered-clock output and is packaged in a 64-pin TQFP with exposed pad measuring 10 mm by 10 mm. An AnyRate clock and data recovery unit is a specialized timing IC that separates clock information from a serial data stream and reconstructs a clean, phase-aligned output clock. In the broader semiconductor hierarchy, it belongs to the clock and timing IC family, where clock and data recovery ICs support high-speed serial communication, optical transport, storage networks, and legacy telecommunications infrastructure. The principal operating parameters are a 3.3 V supply, a minimum line rate of 28 Mbps, a maximum line rate of 2.7 Gbps, and one recovered output. Its AnyRate architecture is intended to accommodate widely different stream rates without requiring a separate fixed-rate recovery design for every protocol. The integrated clock multiplier adds clock-generation capability within the same recovery system, reducing the need for additional clock support in suitable designs. The manufacturer describes the device for Ethernet, SONET/SDH, ATM, Fibre Channel, and other high-speed serial applications. These systems require deterministic clock recovery because upstream switching, line coding, transmission, and reception can introduce timing offsets and jitter. By recovering data and clock together, the SY87721LHG supports alignment at the receiver while the recovered clock can drive downstream circuitry. Typical uses include optical network terminal equipment, Fibre Channel links, ATM interfaces, SONET/SDH transport paths, and clock-recovery blocks within Gigabit Ethernet designs. The 2.7 Gbps upper rate covers legacy high-speed serial links, while the 28 Mbps lower limit allows the recovery function to cover a broad rate range. Designers should follow the manufacturer datasheet for the complete pin-description table, reference circuitry, loopback arrangement, and exposed-pad land pattern. Particular attention is required for high-speed differential routing, controlled clock topology, power and ground distribution, and thermal management of the exposed pad. The absence of a high-frequency switching stage does not eliminate return-path and supply-noise concerns. This product page combines the verified operating limits, package information, application context, sourcing workflow, and structured engineering guidance. It also distinguishes confirmed characteristics from details that must be established from the complete manufacturer datasheet before schematic capture, signal-integrity simulation, or production release.

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SY87721LHI - 2.7Gbps AnyRate CDR | Microchip Technology
SY87721LHI

SY87721LHI - 2.7Gbps AnyRate CDR | Microchip Technology

The Microchip Technology SY87721LHI is a 3.3 V AnyRate clock and data recovery IC with an integrated clock multiplier, supporting data rates from 28 Mbps to 2.7 Gbps. It is supplied in a 64-pin TQFP exposed-pad package measuring 10 mm by 10 mm. A clock and data recovery IC, commonly called a CDR, reconstructs a stable timing reference from a serial data stream that may have accumulated clock, phase, or frequency uncertainty. The CDR sits within the physical-layer signal path between a high-speed transceiver and the digital logic that processes the recovered payload. The SY87721LHI combines this timing-recovery function with an integrated clock multiplier for systems requiring both recovered data and a derived reference clock. Key features include support for data rates from 28 Mbps through 2.7 Gbps, operation from a single 3.3 V supply, and one recovered output. Its AnyRate architecture is designed for SONET/SDH, ATM, Gigabit Ethernet, Fast Ethernet, Fibre Channel, IEEE 1394, and InfiniBand-related links. The device is intended for telecommunications, optical-networking, storage-network, and high-speed serial-interface equipment where the transmitter and receiver clock domains can differ. The integrated clock multiplier supports systems in which a recovered clock must be translated into another required operating frequency. This avoids assigning a separate multiplier to a design when the link interface already contains a suitable recovery and clock-generation block. The device is positioned for endpoint and line-card designs requiring deterministic serial-clock recovery over a broad operating-rate range rather than a fixed-rate-only recovery function. Typical implementations include SONET/SDH line interfaces, ATM and Gigabit Ethernet backplanes, Fibre Channel links, IEEE 1394 connections, and InfiniBand equipment. In each case, the circuit interfaces with high-speed serialized data and supplies timing that must remain aligned with the incoming signal. Board-level design should preserve high-speed signal integrity because jitter, impedance discontinuities, and return-path discontinuities directly affect recovery performance. For a new layout, use the manufacturer pin-description table to assign power, ground, serial-data, reference-clock, and multiplier connections exactly. Place bypass capacitors close to the supply pins and keep the exposed thermal and electrical pad connected to a low-impedance ground plane according to the package land pattern. Confirm that the selected reference-clock source, loop filter, and external components support the intended data rate before production release. This product page combines the published operating limits with practical guidance for clock-and-data recovery, package implementation, and interface selection. It also distinguishes verified drop-in replacements from parts that merely share a broad communication function, helping engineers confirm footprint, pin assignment, and rate compatibility before modifying an existing PCB.

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SY87721LHY - 2.7GHz Clock/Data Recovery IC | Microchip
SY87721LHY

SY87721LHY - 2.7GHz Clock/Data Recovery IC | Microchip

The Microchip Technology SY87721LHY is an application-specific clock and data recovery integrated circuit with one output, a maximum operating frequency of 2.7 GHz, and operation across 28 Mbps to 2.7 Gbps. The device is packaged in a 64-pin TQFP with exposed pad, a surface-mount configuration designed for high-speed communications equipment. A clock and data recovery IC, or CDR, is a timing IC that extracts or reconstructs a serial data stream and aligns it with a recovered or multiplied clock. Within the clock and timing hierarchy, the SY87721LHY belongs to the application-specific clock/timing category and supports Ethernet, SONET/SDH, and ATM equipment. Its integrated clock multiplier allows the recovered timing information to be reused within high-speed line-card and network-interface designs. Key characteristics include a 3.15 V to 3.45 V supply range, support for data rates from 28 Mbps through 2.7 Gbps, one clock or recovered-data output, and CML or PECL-compatible output signaling. The listed operating-temperature range is -40°C to 85°C, allowing use across industrial temperature grades while maintaining the high-speed timing performance required by serial links. The SY87721LHY integrates clock and data recovery with a clock multiplier in one package. This consolidation can reduce the number of separate timing components required in a communications design. At the upper end of its stated range, its 2.7 GHz capability addresses demanding SONET/SDH and related network transmission systems, while the lower 28 Mbps rate supports lower-speed recovered-clock interfaces. Typical applications include Ethernet line cards, SONET/SDH transport equipment, ATM networking systems, optical-network interface assemblies, serial backplanes, and high-speed clock-distribution subsystems. The exposed-pad TQFP package also provides a thermal path to the PCB, which is important when high-speed devices dissipate power in compact communications hardware. Design the power supply and decoupling network for the specified 3.15 V to 3.45 V range, and confirm that the PCB accommodates the exposed thermal pad. Use the manufacturer pin-description and reference-layout information when assigning high-speed inputs and outputs because trace length, return paths, and decoupling placement can materially affect signal integrity. This page organizes the SY87721LHY's core timing specifications, packaging, application guidance, and sourcing information. It also distinguishes verified device characteristics from parameters that require direct confirmation from the manufacturer datasheet, helping engineers plan a new design or assess an existing PCB revision.

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SY87729LHG - 365MHz Fractional Clock Synthesizer | Microchip
SY87729LHG

SY87729LHG - 365MHz Fractional Clock Synthesizer | Microchip

The Microchip Technology SY87729LHG is a 365 MHz fractional-N clock synthesizer IC with one differential PECL output, packaged in a 32-pin TQFP with exposed pad. The supplied product information identifies it as an AnyClock device for Ethernet, Fibre Channel, SONET/SDH/ATM, and related networking infrastructure. Its 3.15 V minimum supply voltage, 3.3 V operating class, 1:1 input-to-output ratio, and differential signal arrangement support clock-generation requirements where deterministic, low-skew distribution is important. A fractional-N synthesizer is a clock-and-timing IC that uses a phase-locked loop to create an output frequency related to a reference frequency while supporting fractional division. Within the clock-and-timing hierarchy, the SY87729LHG belongs to the PLL-based synthesizer category. This positioning distinguishes it from simple oscillators and fixed-ratio clock buffers: the device is intended to derive precise communications-clock frequencies from an external reference and then deliver a differential PECL output. The verified product record identifies the SY87729LHG as a monolithic fractional synthesizer with PLL capability, one output circuit, a 1:1 input-to-output ratio, and differential input and output operation. Its maximum frequency is listed as 365 MHz. The part is marked obsolete in the supplied datasheet-derived listing, so it should be treated as a legacy clock source for maintenance, replication, and redesign analysis rather than a recommended choice for a new production program. The SY87729LHG is particularly relevant to networking equipment requiring Ethernet, Fibre Channel, or SONET/SDH/ATM clocking. A single output allows it to support a dedicated clock-generation channel, although system-level designs may require additional buffers, dividers, or distribution ICs. Differential PECL interfacing can reduce susceptibility to common-mode noise when the source and receiver use controlled impedance and properly terminated networks. Designers should verify the complete pinout, reference requirements, jitter specifications, supply tolerances, and exposed-pad land pattern from the manufacturer datasheet before making a replacement. The exposed pad requires a low-impedance ground connection and adequate thermal copper. Differential input and output traces should have controlled impedance, short return paths, and symmetrical routing. This product record combines the verified 365 MHz fractional-synthesizer specifications, package information, lifecycle status, and source links with explicit uncertainty markers where pricing and detailed electrical data were not available. It also separates genuinely verified drop-in alternatives from unverified cross-reference results so engineers can make a safer sourcing and redesign decision.

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SY87729LHI - 365MHz Fractional-N Clock Synthesizer | Microchip
SY87729LHI

SY87729LHI - 365MHz Fractional-N Clock Synthesizer | Microchip

The Microchip Technology SY87729LHI is a fractional-N clock synthesizer IC with a 27 MHz input, a maximum output frequency of 365 MHz, one clock output, and differential PECL interfaces. It operates from a 3.15 V to 3.45 V supply in a 32-pin TQFP exposed-pad package. The SY87729LHI is intended for telecommunications clocking applications involving Ethernet, Fibre Channel, SONET, SDH, and ATM systems. A clock synthesizer is a clock-and-timing semiconductor that converts one or more reference inputs into synchronized output clock signals. Fractional-N architectures divide an integer reference frequency by an integer and a fractional ratio, allowing fine output-frequency resolution without changing the crystal reference itself. Within the broader semiconductor hierarchy, this device is a clock generator and timing IC used to support communication infrastructure, network equipment, and data-transmission systems. The verified product information identifies a 27 MHz reference input, operation up to 365 MHz, one output, PECL input and output interfaces, and a narrow 3.15 V to 3.45 V operating-supply range. Its operating temperature range is -40°C to 85°C. These characteristics make the device applicable where a conventional integer-N divider cannot provide the required output-frequency resolution. The fractional-N synthesis architecture supports programmable clock ratios while retaining an externally supplied reference. PECL signaling is intended for high-speed clock distribution in telecommunications equipment, although interface amplitude, termination, and routing require board-level verification. The 32-pin TQFP exposed-pad package provides a defined thermal path when the device is mounted with its exposed pad soldered according to the manufacturer land pattern. Typical uses include line-card clock generation, Ethernet and Fibre Channel interface modules, SONET or SDH transport equipment, and ATM-based network systems. In each case, the 365 MHz maximum output supports high-rate clock generation while the fractional division capability allows the output frequency to be adjusted more closely to the system requirement than an integer-only divider. Designers should verify all divider settings, output-drive strength, jitter, reference purity, and loop-bandwidth requirements against the manufacturer datasheet before production release. The 3.15 V to 3.45 V supply range requires a regulator or rail capable of maintaining the specified voltage, and the exposed pad needs careful PCB layout for effective heat removal. This page consolidates the verified SY87729LHI operating limits, package information, cross-reference results, procurement caveats, and engineering guidance. It also separates confirmed manufacturer-grade facts from unavailable details so designers can identify what must still be checked in the official SY87729LHI datasheet before schematic release.

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SY87729LHY - 365MHz Fractional-N Clock Synthesizer | Microchip
SY87729LHY

SY87729LHY - 365MHz Fractional-N Clock Synthesizer | Microchip

Microchip Technology SY87729LHY is a 3.3V rate-independent fractional-N frequency synthesizer that generates a differential PECL reference from a single input source. The device covers a 10MHz to 365MHz output range and is supplied in a 32-pin TQFP package with an exposed pad. Verified distributor data identifies it as a clock synthesizer and jitter-cleaning device, while the manufacturer datasheet describes support for standards-compliant transport reference generation. A fractional-N synthesizer is a clock and timing IC that synthesizes programmable frequencies from a stable reference. Its hierarchy is fractional-N synthesizer > PLL-based clock generator > clock synthesizer > clock and timing IC > semiconductor. This technology is particularly useful when a system needs a precise communications reference without relying on a separate crystal oscillator for every output frequency. Differential PECL outputs provide complementary signals suited to high-speed digital clocking and optical-transponder systems. The SY87729LHY operates from a 3.3V supply and synthesizes frequencies from 10MHz to 365MHz using a single reference source. The verified search material specifically describes a 27MHz reference input and a maximum output of 365MHz. It generates the correct differential PECL reference required by the Micrel SY87721L combined clock-and-data-recovery and clock-multiplier-unit device, whose associated data rate range extends from 10Mbps to 2.7Gbps. Fractional-N synthesis permits accurate generation of transport-related reference frequencies with or without forward-error correction. This is valuable in systems requiring standards-compliant downstream data units even when the associated upstream interface produces no signal. Exact phase-noise, jitter, reference-input, output-frequency, and divider specifications are not included in the supplied excerpts and must be confirmed in the manufacturer datasheet before final timing-budget approval. Typical uses include optical transponders, SONET-compatible transport equipment, Ethernet-compatible clocking systems, and other communications links driven by the SY87721L. In these applications, the synthesizer establishes the local reference required by the downstream CDR/CMU, while the 365MHz upper output range provides headroom for demanding clock rates. Board-level signal integrity and differential clock routing remain essential because high-speed edge quality is not determined by output frequency alone. Designers should place the input, output, and bypass connections as shown in the manufacturer application guidance, maintain short return paths, and use controlled-impedance routing for differential PECL pairs. The exposed pad should be connected to the ground plane according to the datasheet thermal and layout instructions. Because detailed termination and decoupling values were not supplied here, those values must be taken directly from the SY87729L manufacturer datasheet rather than inferred. This product summary combines verified manufacturer and distributor information, pricing available as of 2026-10-28, same-family replacement information, and practical guidance for evaluating the SY87729LHY. It highlights where verified data is complete and marks unresolved electrical, environmental, pin-level, and lifecycle details rather than presenting unsupported assumptions as specifications.

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