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SY69753LHG - 155Mbps 3.3V PECL CDR | Microchip
The Microchip Technology SY69753LHG is a 3.3 V clock and data recovery IC with a multiplexer function, designed for 125 Mbps and 155 Mbps PECL links associated with Ethernet, SONET/SDH, and ATM OC-3 systems. The device is supplied in a 32-pin TQFP with exposed pad, measuring 7 mm by 7 mm, and includes a PLL for timing generation and recovery. A clock and data recovery IC is a specialized timing-device category that regenerates a synchronized clock from a serial data stream, compensates for accumulated phase and timing jitter, and supports deterministic transfer across high-speed communication links. Within the broader hierarchy, the SY69753LHG belongs to clock and timing ICs, interface ICs, and ultimately integrated semiconductors used in telecommunications and data-networking equipment. Principal device characteristics include support for data rates of 125 Mbps and 155 Mbps, PECL input and output interfaces, one recovered output, PLL support, and a 3.3 V supply. The package combines a 7 mm by 7 mm body with an exposed pad that provides a thermal and ground connection on a multilayer PCB. Published distributor descriptions also identify the part as a surface-mount clock and timing device suitable for precise timing applications. The SY69753LHG is intended for designs where a transmitted serial stream must be recovered into a usable clock and data pair. Its PLL-based architecture can support clock recovery and phase alignment, while the multiplexer function consolidates timing-related signal routing. The 125 Mbps operating point covers Fast Ethernet-related infrastructure, and the 155 Mbps point aligns with ATM OC-3 and 155 Mbps SONET/SDH-class interfaces. The PECL interface requires source termination, correct common-mode voltage, and controlled-impedance board layout. Typical uses include ATM network interface equipment, SONET/SDH tributary synchronization, Fast Ethernet line-card clocking, telecommunications backplanes, and optical-transport modules. In these systems, the recovered clock reduces accumulated timing drift and provides a stable reference for downstream retimers, serializers, switching silicon, and test equipment. When laying out a circuit around the SY69753LHG, treat the exposed pad as a primary ground and thermal connection rather than an unused package feature. Route PECL clocks and data as short, controlled-impedance nets, provide the decoupling and termination required by the device application circuit, and verify source, receiver, and multiplexer compatibility before layout release. This page combines verified distributor specifications with an engineering-focused assessment of speed, interface type, package implementation, and replacement constraints. It also distinguishes the directly purchasable base part from a tape-and-reel ordering code and documents where complete electrical, pin-level, lifecycle, and pricing information requires confirmation.
SY69753LHI - 155Mbps Clock Data Recovery | Microchip
The Microchip SY69753LHI is a clock recovery and data retiming integrated circuit for OC-3/STS-3 applications operating at 155 Mbps NRZ, supplied in a 32-pin TQFP with exposed pad, 7 mm × 7 mm package. It provides one recovered clock output and is associated with 3.3 V operation, Ethernet, SONET/SDH, and ATM OC-3 signal-chain applications. A clock and data recovery IC, commonly abbreviated CDR, belongs to the clock and timing IC hierarchy within integrated circuits and semiconductor signal-conditioning devices. Its primary function is to recover a usable clock from a serialized data stream while retiming data against that recovered clock. This allows a receiver to maintain alignment between transmitted data and its associated timing information across a high-speed serial link. The verified product information identifies the SY69753LHI as a complete clock recovery and data retiming device for OC-3/STS-3 applications at 155 Mbps NRZ. It is listed as a 3.3 V, 155 Mbps application-specific clock and timing IC with one output. The exposed-pad TQFP construction provides a thermal and grounding interface on a 7 mm × 7 mm surface-mount package, although detailed pin names, input tolerances, jitter specifications, and AC timing limits are not present in the supplied source data. The device is intended for systems where a serial transmitter produces NRZ data at OC-3 or STS-3 rates and the receiver needs regenerated timing rather than a free-running local clock. In this role, the recovered clock can establish a timing reference for subsequent deserialization or return-path multiplexing. Because the verified listing classifies the part as a multiplexer IC with one output, system allocation should provide separate serialization and receive-path functions rather than assuming multiple independent recovered outputs. Typical applications include SONET/SDH terminal equipment, ATM OC-3 line interfaces, Ethernet-oriented 155 Mbps links, telecommunications line cards, and high-speed data transmission systems. The 155 Mbps NRZ operating mode is especially relevant to legacy and installed transport infrastructure where compliant line-card designs already specify this Micrel-family clock recovery function. A key design consideration is that the source data does not disclose the exact pin mapping, differential input amplitude, reference-clock requirements, loop bandwidth, or jitter-transfer behavior. Engineers should therefore obtain the manufacturer datasheet and verify signal integrity, termination, decoupling, and exposed-pad layout against the complete electrical specification before releasing a PCB or substituting any component. This page consolidates verified distributor descriptions, package information, sourcing links, application context, and design cautions. It also distinguishes documented facts from unavailable parameters so engineers can identify what must still be confirmed in the manufacturer datasheet before layout or production use.
SY69952ZC - 155.52Mbps Clock Recovery IC | Microchip
The Microchip Technology SY69952ZC is an OC-3/STS-3 clock-recovering transceiver operating at 155.52 Mbps with one output in a 28-SOIC package. It combines an ATM-compatible transmitter and receiver with clock and data recovery for Ethernet, SONET/SDH, and ATM transport equipment. The verified device data identifies the SY69952 family as a single-chip OC-3/STS-3 solution and specifically associates SY69952ZC with a 28-pin SOIC package. A clock-recovering transceiver is a clock-and-timing semiconductor that accepts high-speed serial data, recovers timing from the incoming signal, and supports transmission and reception within optical or network transport systems. In the broader hierarchy, it belongs to clock and timing ICs, interface ICs, and semiconductor signal-path components. Its primary value is integrating functions that otherwise require separate transmitter, receiver, and clock-recovery circuitry. The verified features include complete ATM-compatible single-chip transmitter and receiver integration, operation at 155.52 Mbps, one recovered-clock output, and compatibility with named ATM processor platforms. The available documentation also indicates seamless operation with PM5345, VNS67200, WAC-013-B/WAC-413-A, and NEC µPD98402 UNI processors. Electrical ratings, supply voltage, recovery thresholds, jitter performance, operating temperature, and package dimensions were not supplied in the retrieved data and therefore must be confirmed from the original manufacturer datasheet. SY69952ZC is suited to ATM and SONET/SDH equipment, OC-3/STS-3 line-interface assemblies, optical transport modules, network processor interfaces, and legacy synchronous multiplexing systems. Its 28-SOIC construction favors conventional surface-mount assembly, but high-speed signal integrity still depends on controlled impedance routing, solid return paths, and careful power-supply decoupling. The device should be evaluated against the original datasheet and processor-interface requirements before use in a new design. A key design consideration is that this is a legacy OC-3/STS-3 clock-recovery device rather than a general-purpose Ethernet PHY. Verify signal rates, logic levels, recovered-clock jitter, reference-clock requirements, and processor timing before replacing it with any modern interface. Lifecycle status and a documented drop-in replacement could not be established from the supplied results. This page consolidates the verified source links, procurement data availability, application context, and unresolved engineering information without inventing missing specifications.
SY69952ZH - 155.52Mbps Clock Recovery IC | Microchip
The Microchip Technology SY69952ZH is an OC-3/STS-3 clock-recovering transceiver with a stated operating rate of 155.52Mbps, one output, and a 28-pin SOIC package. It combines clock and data recovery with PECL-oriented interface information identified in the verified results. The device is intended for telecommunications equipment using Ethernet, SONET/SDH, and ATM-related transports, where recovered timing must be extracted from a high-speed serial signal. A clock and data recovery transceiver, or CDR, is an integrated circuit that receives a serial data stream, separates or reconstructs its timing relationship, and produces aligned clock and data outputs. In the optical-transport hierarchy, it sits between the line-side high-speed interface and downstream digital logic. The SY69952ZH is therefore a timing-integrity component rather than a general-purpose clock generator or ordinary digital interface IC. The verified product information identifies OC-3/STS-3 operation, a 155.52Mbps rate, PECL input information, one output, and compatibility with several ATM UNI processors. A separate technical result describes a clock-generator input range of 6.41MHz to 19.64MHz, but the supplied excerpts do not establish how that range maps to every operating mode, supply condition, or pin function. Engineers should therefore use the manufacturer datasheet for final acquisition and circuit-design decisions. The 28-SOIC package offers through-hole assembly in a 7.50mm-wide body format according to the distributor result. Its size and pin count make it practical for legacy telecommunications boards, industrial transmission equipment, and repair or modernization programs. The package is not a modern high-density surface-mount ball-grid-array solution, so board area and manual or automated through-hole compatibility should be considered. Typical uses include ATM UNI links, SONET/SDH tributary-rate equipment, Ethernet transport modules, and OC-3/STS-3 line cards. The recovered-clock function is valuable when the receiver must regenerate a stable timing reference before forwarding payload data. The verified material does not provide a full electrical characterization, recommended decoupling, propagation-delay distribution, jitter specification, or absolute maximum-rating table. When designing a replacement board, verify every pin against the official datasheet and preserve the original channel-length and impedance layout. PECL interfaces are sensitive to biasing, termination, trace geometry, and return paths, so a nominal pin-compatible package alone does not guarantee signal-integrity equivalence. Confirm supply voltage, logic thresholds, reference-clock requirements, and recovery-loop behavior before production use.
SY87700LHI - 3.3V 175Mbps AnyRate CDR | Microchip Technology
The Microchip Technology SY87700LHI is a 3.3V AnyRate clock and data recovery integrated circuit for 32Mbps to 175Mbps NRZ data streams, housed in a 32-pin TQFP-EP (7x7 mm) package. It combines clock generation and clock-and-data recovery functions, provides one recovered output, and includes two on-chip phase-locked loops for telecommunications and high-speed digital-network applications. A clock and data recovery IC, or CDR, is a specialized timing and timing-recovery component that extracts a usable clock from an incoming data stream and can regenerate aligned data and clock outputs. In the broader semiconductor hierarchy, a CDR belongs to clock and timing ICs, phase-locked-loop-based timing ICs, and ultimately the wider integrated-circuit category. The SY87700LHI is specifically positioned for SONET, SDH, ATM, Ethernet, and other high-speed NRZ transmission systems. Verified features include operation from a single 3.3V supply, recovery of data rates from 32Mbps through 175Mbps, one output, and an industrial temperature range of -40°C to +85°C. Two integrated PLLs support clock generation and clock recovery, while the AnyRate architecture allows the device to accommodate a broad range of line rates rather than being restricted to one fixed frequency. These characteristics make it useful in line cards, routers, ATM equipment, SONET/SDH transport systems, and other synchronization-sensitive network equipment. The device accepts PECL input according to distributor and manufacturer-derived listing data. Its recovery and generation functions are implemented around phase-locked-loop timing, enabling it to recover a clock from a corrupted or distorted NRZ stream and present a regenerated output to downstream logic. Exact jitter, lock-time, input-output delay, output-current, and absolute-maximum-rating details were not included in the supplied verified extracts and should therefore be confirmed in the manufacturer datasheet before release to production. The 32-TQFP-EP package provides 32 perimeter pins plus a thermal or electrical center feature associated with the EP package designation. Compared with a conventional TQFP-32, the EP construction can improve heat transfer into a PCB copper plane. This is valuable in communications equipment where continuous clock-recovery activity can contribute to device dissipation even when the external interface rate changes. A key design consideration is that this is a legacy-style PECL timing IC rather than a general-purpose low-voltage CMOS interface device. PCB layout must provide controlled impedance, short high-speed traces, appropriate reference-plane continuity, and clean separation between noisy switching paths and the recovered clock and data outputs. Decoupling should follow the manufacturer datasheet layout, and the exposed-pad region should be connected according to its electrical and thermal requirements. This page consolidates verified distributor specifications, same-family replacement candidates, comparison parameters, and practical implementation guidance. It distinguishes verified facts from unavailable datasheet details so engineers can identify procurement choices, engineering trade-offs, and the remaining checks required before using the SY87700LHI in a new SONET, SDH, ATM, or Ethernet timing design.
SY87700LSI - 3.3V AnyRate Clock and Data Recovery | Microchip
The Microchip Technology SY87700LSI is a 3.3 V AnyRate clock and data recovery integrated circuit supporting data rates from 32 Mbps to 175 Mbps and supplied in a 32-pin TQFP package. It is designed for high-speed NRZ communication systems where recovered clock and retimed data are required to reduce timing errors and jitter. An AnyRate clock and data recovery IC is a clock-and-timing device that extracts or recovers a usable clock from an incoming data stream and can retime the associated data. In the broader semiconductor hierarchy, this device belongs to clock and timing ICs, application-specific timing integrated circuits, and ultimately the wider semiconductor category. Its primary role is to support reliable signal transfer in SONET, SDH, ATM, and other high-speed data-transmission systems. The verified product information identifies a 3.3 V supply, an operating data-rate range of 32 Mbps to 175 Mbps, and AnyRate clock and data recovery operation. The Microchip family page additionally identifies the related SY87700 family as supporting rates up to 208 Mbps, indicating a broader family capability than the 175 Mbps figure stated for SY87700LSI. The industrial temperature range associated with the SY87700L family is -40°C to +85°C. The SY87700LSI integrates clock recovery and data-retiming functions in one device, reducing the need for separate recovery circuitry in a communication link. This integration can simplify board partitioning while helping maintain timing alignment between the recovered clock and outgoing data. Its 32-pin TQFP construction provides a conventional surface-mount interface for equipment assembled using standard semiconductor manufacturing processes. Typical uses include SONET and SDH transport systems, ATM links, telecommunications line equipment, and other NRZ-based high-speed data links where the transmitter and receiver require an elastic or recovered data interface. It may also support proprietary backplane or serial-link architectures operating within its specified 32 Mbps to 175 Mbps range. Designers should verify the complete datasheet for differential impedance, reference-clock requirements, jitter tolerance, loop bandwidth, bypass behavior, and power-supply sequencing before layout. Input and output return paths must be controlled because a clock-and-data recovery IC can amplify timing degradation when its input signal quality is inadequate. This product record consolidates the verified manufacturer specifications, distributor availability references, package information, and drop-in family comparison into an engineering-oriented guide. It distinguishes confirmed SY87700LSI data from parameters that still require confirmation from the full manufacturer datasheet.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
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.
SY87739LHG - 729 MHz Fractional-N Synthesizer | Microchip Technology
Microchip Technology SY87739LHG is a fractional-N frequency synthesizer designed for high-performance data transport systems, with a maximum output frequency of 729 MHz, PECL inputs and outputs, and a 32-TQFP-EP package measuring 7 x 7 mm. The device is assigned to the application-specific clock and timing category and supports Ethernet, Fibre Channel, SONET/SDH, and ATM clocking applications. A fractional-N frequency synthesizer is a clock-generation IC that uses a phase-locked loop to produce an output frequency derived from a reference clock. Its fractional division capability permits frequency synthesis between integer division ratios, making this device category useful when an exact output frequency is required without changing the external reference. In the system hierarchy, the SY87739LHG is a PLL-based clock synthesizer, a specialized member of clock and timing integrated circuits and a semiconductor. The key documented features are a maximum output frequency of 729 MHz, differential PECL input and output interfaces, a 1:1 input-to-output ratio, and operation from a 3.3 V supply identified in the available product data. The listed frequency range extends from 10 MHz to 729 MHz. Its differential clocking architecture is intended to support high-speed data transport systems where signal integrity and clock quality are important design considerations. The SY87739LHG belongs to Microchip Technology's AnyClock family and uses a fractional-N synthesis architecture. The available product listing identifies the PLL feature and one output circuit. The 32-pin TQFP package with an exposed pad provides a defined surface-mount footprint for equipment requiring high-frequency clock generation in a moderately compact package. Typical applications include Ethernet line cards, Fibre Channel systems, SONET/SDH transport equipment, ATM networks, and other high-performance data transport platforms. In these systems, the synthesizer can establish a required internal operating frequency from a stable reference while supporting high-speed differential clock distribution. Equipment designers should also account for reference quality, loop bandwidth, jitter, supply integrity, and output termination. A key design consideration is that the listed device status is obsolete. Existing equipment can continue to use the documented SY87739LHG configuration, but new designs should not assume current production availability. The 7 x 7 mm exposed-pad package also requires a PCB footprint and thermal design consistent with the manufacturer's package drawing, particularly when the adjacent circuitry or exposed pad is used for heat removal. This page combines the verified distributor and manufacturer-listing information with application guidance, lifecycle context, a specification-gap inventory, and transparent replacement analysis. Because the supplied cross-reference results identify search tools but do not name a verified pin-compatible substitute, it does not present unverified parts as drop-in replacements.
SY87739LHI - 729MHz Fractional-N Synthesizer | Microchip
Microchip Technology SY87739LHI is a protocol-transparent, 3.3 V fractional-N frequency synthesizer with one differential PECL output, an output-frequency range of 10 MHz to 729 MHz, and operation from a single 27 MHz reference source. The device is supplied in a 32-pin TQFP with exposed pad package, designated 32-TQFP-EP (7x7) by DigiKey. Its architecture provides rate-independent synthesis for communications equipment requiring exact frequencies associated with Ethernet, Fibre Channel, SONET/SDH, and ATM protocols. A fractional-N synthesizer is a clock-generation IC that derives an output clock from a stable reference while using fractional division to produce frequencies that are not limited to integer ratios of the reference. The SY87739LHI belongs to the broader clock and timing hierarchy: fractional-N frequency synthesizer, clock generator, timing IC, and integrated circuit. This makes it useful where a system requires a programmable or protocol-related clock while retaining the operational simplicity of a single-reference architecture. The primary electrical features include a 10 MHz to 729 MHz synthesis range, a maximum characterized output frequency of 729 MHz, one differential PECL output, and 3.3 V operation. A 27 MHz reference allows the synthesizer to generate exact frequencies used by common transport protocols, with or without forward-error correction. Protocol transparency is important because the generated frequency can follow the required clock relationship rather than being limited to a fixed integer divider ratio. The SY87739L integrates a complete rate-independent frequency-synthesis function in one IC. It is specified for Ethernet, Fibre Channel, SONET/SDH, and ATM clock-generation requirements, making it particularly relevant to optical transponders, line cards, clocking subsystems, and communications test equipment. Its differential PECL interface supports high-speed clock distribution, although board-level implementation still requires correct differential routing, controlled impedance, and power-supply decoupling. Typical uses include SONET/SDH transponder reference generation, Fibre Channel interface clocking, Ethernet equipment clock synthesis, ATM networking hardware, optical transport modules, and laboratory communication test systems. Designers should confirm that the selected output frequency, reference configuration, PECL termination, and thermal conditions match the exact datasheet operating requirements before releasing production hardware. PCB implementation requires careful treatment of the exposed pad and high-speed clock nets. The exposed pad should be connected to the ground plane through the manufacturer-recommended thermal-via pattern, while input, output, and supply connections should be kept short. PECL output biasing and any downstream termination must follow the reference circuit because incorrect termination can alter edge quality, current consumption, and clock amplitude. This product record combines the verified manufacturer and distributor data with practical selection criteria for protocol timing, package-aware alternatives, and implementation considerations. It highlights where verified electrical data is available and marks undisclosed electrical, lifecycle, pricing, and pin-level information explicitly rather than inferring values that are not supported by the supplied sources.
SY89426JC - 622.08MHz SONET Clock Synthesizer | Microchip
The Microchip SY89426JC is a clock and frequency synthesizer IC that generates 622.08 MHz and 155.52 MHz clocks for SONET OC-12 and OC-3 systems, with a maximum output frequency of 622.08 MHz and a 28-pin J-lead LCC package. A clock synthesizer is a timing IC that derives one or more precisely related output frequencies from an external reference clock. Within the hierarchy of clock and timing integrated circuits, it supports communication infrastructure requiring low deterministic jitter, consistent frequency relationships, and multiple logic-compatible outputs. The SY89426JC uses TTL/CMOS-compatible inputs and provides PECL clock outputs. The device provides a single-chip source for 622.08 MHz and 155.52 MHz clocks. Its 622.08 MHz output is differential PECL, while the 155.52 MHz output is single-ended PECL. It also includes a reference output and supports SONET-compliant jitter performance stated as 0.01 UI in the retrieved technical data. The SY89426JC is intended for telecommunications equipment operating at SONET OC-12 and OC-3 line rates. The 622.08 MHz and 155.52 MHz outputs support clock generation in line-card, transceiver, and network-interface designs where a local oscillator must provide both high-speed and divided timing signals. Use controlled-impedance routing for the differential 622.08 MHz output and provide compliant termination and decoupling close to the device. The 28-LCC package is a leaded ceramic package, so thermal performance and assembly compatibility should be checked against the PCB footprint and manufacturing process. This page consolidates verified distributor specifications, package information, datasheet links, and design-oriented guidance for the SY89426JC clock synthesizer.
SY89426JI - 622.08MHz SONET Clock Synthesizer | Microchip
The Microchip Technology SY89426JI is a clock and frequency synthesizer IC that generates 622.08 MHz and 155.52 MHz clocks for SONET OC-12 and OC-3 systems. Its primary high-speed output is differential PECL, its 155.52 MHz output is single-ended PECL, and it accepts TTL/CMOS-compatible reference inputs. The device is packaged in a surface-mount 28-LCC J-lead package. A clock synthesizer is a timing IC that derives one or more internally regulated clock outputs from an external reference. Clock synthesizers belong to the clock and timing IC hierarchy, where they support communication links, network equipment, and test systems by distributing frequencies with controlled phase and jitter. In a SONET design, accurate clocks are essential because transmit and receive hardware must process high-speed serial data within defined timing margins. The SY89426JI provides a single-chip source for both 622.08 MHz and 155.52 MHz clock frequencies. The verified device description identifies SONET-compliant jitter performance of 0.01 UI. Differential PECL at 622.08 MHz is suited to high-speed serial links, while the single-ended PECL output at 155.52 MHz supports parallel or lower-rate clocking requirements. TTL/CMOS-compatible inputs and a reference output simplify integration with external oscillators and system clock-distribution networks. Available verified data does not specify the complete electrical limits, supply-voltage range, power dissipation, temperature range, or detailed pin assignments. Those parameters remain marked as data-needed rather than inferred from the device category. Likewise, no manufacturer datasheet URL appears in the supplied search results, so a distributor or indexed datasheet page is retained only as a source reference rather than represented as an official Microchip PDF. Typical uses include SONET optical network equipment, telecommunications line cards, high-speed clock-distribution assemblies, and instrumentation that needs related OC-12 and OC-3 clock domains. The principal design consideration is interface compatibility: downstream circuits must support differential or single-ended PECL levels, and any unused output or supply pins must be terminated exactly as directed by the complete datasheet. This product page consolidates the verified clock frequencies, logic families, SONET jitter claim, package format, source links, and engineering cautions. It also distinguishes documented functions from unspecified parameters, helping designers evaluate the SY89426JI without converting category-level assumptions into unsupported component specifications.
SY89426JY - 622.08MHz SONET Clock Synthesizer | Microchip
The Microchip Technology SY89426JY is a clock/frequency synthesizer IC engineered for SONET OC-3 and OC-12 clock generation. It accepts a 38.88MHz-to-77.76MHz reference input and produces a maximum 622.08MHz clock, with documented TTL input and PECL/TTL output interfaces. The device is packaged in a 28-pin leaded chip carrier, identified by distributors as 28-LCC (J-Lead). Its core role is to derive a high-speed, phase-aligned telecommunications clock from a lower-frequency reference while supporting high-speed digital interfaces. A clock synthesizer is a timing IC that generates, multiplies, or distributes clock signals according to a defined frequency relationship. In the broader semiconductor hierarchy, this product is a clock and timing IC, then a frequency synthesizer, and finally a SONET line-rate clock-generation component. This classification matters because telecom designs require deterministic relationships among reference, payload, and line clocks rather than a general-purpose oscillator. The SY89426JY targets the 51.84MHz, 155.52MHz, 311.04MHz, and 622.08MHz SONET domain through its supported generation function. Verified source data identifies one clock circuit, no PLL, a TTL reference input, PECL and TTL outputs, a maximum frequency of 622.08MHz, and a 28-LCC package. The absence of a PLL is a defining architectural constraint: the synthesizer relies on a supplied reference rather than a phase-locked loop. Distributor descriptions further identify the part as lead-free and intended for industrial-temperature operation, but the supplied evidence does not expose voltage limits, supply current, jitter, output levels, pin names, or complete timing tables. The device is suitable for SONET OC-3 and OC-12 transport equipment, optical-network terminals, line cards, clock-distribution modules, and test equipment that require a 622.08MHz clock. Its multiple logic interfaces allow integration where the next stage accepts PECL or TTL. Because high-speed edges and propagation delays can affect timing integrity, the PCB must provide controlled impedance, short traces, solid return paths, and clean separation between clock and data or noisy power circuitry. When designing around SY89426JY, verify every supply rail, logic threshold, decoupling value, and output termination against the manufacturer datasheet before schematic release. Do not assume generic PECL or TTL termination because device-specific output topology and board-level loading are not present in the supplied data. Differential-clock standards, such as the CML interface referenced by the retrieved datasheet result, may not be available from this part even though CML is common in related SONET devices. This page combines verified distributor specifications, source-qualified data gaps, application context, and replacement constraints. It also distinguishes a true drop-in replacement from a merely functional clock synthesizer, since same-package status, pin compatibility, electrical ranges, and lifecycle availability must all be confirmed before substitution.