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SY69952ZH

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.

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SY75572LMG

SY75572LMG - 267MHz Differential Clock Fanout | Microchip

The Microchip Technology SY75572LMG is a high-speed, fully differential 1:2 clock fanout buffer with a 2:1 input multiplexer, optimized to provide two identical differential output copies. It supports clock frequencies up to 267 MHz and is specified with 137 fs phase jitter and a maximum output-to-output skew of 50 ps. The device is offered in a 16-VFQFN package with an exposed pad and is designed for PCI Express clock-distribution applications. A clock fanout buffer is a timing IC that receives one differential clock source and reproduces it across multiple output paths. This architecture helps maintain consistent clock timing across widely separated circuits while reducing load-dependent distortion at the source. The SY75572LMG extends this concept with a 2:1 input MUX, allowing two differential input choices to be selected for the two identical output copies. HCSL and LVDS logic levels are supported for input and output operation according to the manufacturer product description. These high-speed differential signaling levels are commonly used in clock links associated with PCI Express systems, where low jitter, controlled skew, and reliable signal transmission are important. The device operates from a 3.3 V ±5% power supply, as stated in the manufacturer datasheet listing. The principal performance characteristics are the 267 MHz operating frequency, 137 fs phase jitter, and 50 ps maximum output-to-output skew. The differential clock architecture provides two matching output copies, while the integrated multiplexer enables source selection in systems that need flexible clock routing or redundancy. Its 16-VFQFN exposed-pad package is intended for compact surface-mount designs requiring careful high-speed layout practices. Typical uses include PCI Express reference-clock distribution, server and workstation clock trees, communications equipment, test and measurement systems, and other high-speed digital platforms. The exposed pad provides a thermal connection to the PCB copper, allowing heat to be transferred away from the device when the board layout includes suitable thermal vias and copper area. For implementation, route differential clock pairs as controlled-impedance nets on a multilayer PCB, keep the input and output paths short, and place decoupling capacitors close to the supply pins. Follow the pin-description table and recommended layout in the manufacturer datasheet when assigning tracks, terminating the differential network, and confirming the exposed-pad connection. This page organizes the verified SY75572LMG specifications, pricing evidence rules, source links, and application guidance into an engineering-focused reference. It also distinguishes confirmed device characteristics from parameters that require direct consultation of the manufacturer datasheet before schematic release or PCB implementation.

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SY75576LKY

SY75576LKY - 267 MHz 1:4 HCSL Clock Fanout Buffer

The Microchip Technology SY75576LKY is a high-speed, fully differential 1:4 clock fanout buffer with a maximum operating frequency of 267 MHz, four identical differential outputs, 137 fs phase jitter, and maximum output-to-output skew of 50 ps. The device is housed in a 20-pin TSSOP package with a 0.173-inch body width of 4.40 mm and operates from a 3.135 V to 3.465 V core supply. A clock fanout buffer is a clock-and-timing IC that receives a differential reference clock and generates multiple synchronized copies for separate loads. Within the broader hierarchy of semiconductor timing devices, a fanout buffer sits between a clock source and the circuits requiring low-skew clock distribution. Its purpose is to isolate loads, reproduce a high-quality differential waveform, and prevent downstream loading from degrading source jitter or edge timing. The SY75576LKY is optimized for PCI Express clock-distribution requirements. Its 1:4 differential architecture provides one input pair feeding four output pairs, allowing a PCIe source to drive multiple endpoints while maintaining controlled skew. The stated 137 fs phase jitter and 50 ps maximum output-to-output skew are particularly useful in high-speed serial links where timing uncertainty can reduce eye margin. The output stage supports HCSL and LVDS signaling, as identified in the product documentation, and operates from a 3.135 V to 3.465 V supply. The industrial temperature range extends from -40 °C to +85 °C. Because the device is intended for high-speed differential distribution, PCB construction, controlled impedance, return paths, and connector or package transition geometry are as important as the nominal clock frequency. Typical uses include PCI Express endpoint and root-complex clock distribution, high-speed serializer input clocks, networking equipment clock trees, and test-and-measurement systems requiring multiple low-skew copies of one reference. It can also serve as a jitter-isolating fanout stage when placed close to the receiving loads. For implementation, follow the manufacturer’s recommended decoupling and high-speed layout guidance, keep differential traces impedance-controlled, and avoid adding unnecessary stubs or test pads on the clock path. Validate source, output, and receiver termination requirements across voltage and temperature before releasing the layout. This page combines the documented clock-performance characteristics, package details, application guidance, and engineering design notes to provide practical selection and layout context beyond a basic distributor parameter list.

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SY75578LMG

SY75578LMG - 267MHz 1:8 HCSL Clock Fanout Buffer | Microchip

The Microchip Technology SY75578LMG is a high-speed, fully differential 1:8 clock fanout buffer operating up to 267 MHz, with eight HCSL outputs, two selectable inputs, 130 fs phase jitter, and maximum 100 ps output-to-output skew. The device is packaged in a 32-pin QFN with an exposed pad and a 5 mm x 5 mm body for compact PCI Express clock-distribution designs. A clock fanout buffer is a clock distribution circuit that receives one differential clock and generates multiple identical output copies. The SY75578LMG belongs to the clock buffer and driver hierarchy, where low jitter, controlled skew, differential signaling, and repeatable output characteristics are essential for transferring timing signals across a PCB. Its 1:8 fanout ratio allows one source clock to feed eight destination circuits without recreating the original clock eight times. Key features include acceptance of HCSL or LVDS input signals, generation of HCSL output levels, two input paths with multiplexing, eight identical output copies, and operation from a 3.3 V supply with a tolerance of plus or minus 5%. The 130 fs phase-jitter figure supports precise high-speed timing, while the maximum 100 ps output-to-output skew establishes the permitted variation among the eight outputs. The fully differential architecture is designed for PCI Express clock-distribution requirements. Differential signaling provides noise immunity on circuit-board interconnects, while the internal fanout stage creates eight matched clock outputs for endpoints, switches, retimers, serializers, or test equipment. The exposed-pad QFN construction supports heat transfer through the PCB, although the thermal requirements of the exact carrier board and loading must be evaluated during layout review. Typical uses include PCI Express reference-clock distribution, server and workstation backplanes, high-speed interface test systems, networking equipment, and industrial control boards that need multiple low-skew differential clock copies. In a PCI Express design, the device can distribute a common 267 MHz-class reference clock to multiple lanes or downstream circuits while maintaining consistent phase relationships. PCB design requires short, symmetric differential routes, continuous reference planes, controlled impedance, and careful placement of the exposed-pad thermal and electrical connections. Decoupling capacitors should be positioned close to the supply and ground pins. Input and output return paths should avoid discontinuities, and the unused clock inputs must be connected according to the manufacturer datasheet rather than left floating. This page combines the manufacturer clock-performance specifications, package details, application guidance, comparison parameters, and practical layout considerations. It also distinguishes a genuine same-package replacement from merely similar clock buffers so that engineers can evaluate drop-in decisions without changing PCB geometry or timing requirements.

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SY87700LHG

SY87700LHG - 175Mbps AnyRate CDR | Microchip Technology

Microchip Technology SY87700LHG is a 3.3 V application-specific clock and timing integrated circuit that performs AnyRate clock and data recovery for NRZ data streams from 32 Mbps to 175 Mbps. The device provides one recovered clock output and incorporates two on-chip phase-locked loops, one dedicated to clock generation and the other to clock recovery. It is packaged in a 32-pin TQFP exposed-pad package measuring 7 mm by 7 mm. A clock and data recovery IC, or CDR, is a specialized timing-integrated-circuit category used to regenerate a stable clock from a serial data stream whose relationship to the source clock may have accumulated timing offset, jitter, or noise. In the broader semiconductor hierarchy, the SY87700LHG belongs to clock and timing ICs, where it sits above the functional block level and below network-interface, telecommunications, and clock-generation subsystems. Its AnyRate architecture is intended to support multiple line rates while recovering a usable timing reference. Key features include operation from 32 Mbps to 175 Mbps, compatibility with SONET, SDH, ATM, and Ethernet-oriented applications, and support for NRZ data streams. The manufacturer documentation identifies both 3.3 V and 5 V supply options within the SY87700 family, while the SY87700LHG orderable configuration is identified as the 3.3 V version. Two on-chip PLLs provide the timing foundation for clock generation and clock recovery, while the single output gives the recovered clock a clearly defined destination within the design. The architecture is important because optical and serial communication links can accumulate timing skew between the transmitter and receiver. By extracting and regenerating timing from the incoming stream, the SY87700LHG reduces dependence on a separate source-synchronous clock at the receiving endpoint. Its 32-to-175 Mbps operating range makes it relevant to legacy telecommunications, asynchronous transfer mode, and recovered-clock network designs rather than modern multi-gigabit serializer-desializer lanes. Typical applications include SONET and SDH tributary interfaces, ATM equipment, Ethernet clock-recovery paths, telecommunications line cards, and legacy network-interface modules. It can also support recovered-clock generation in industrial communication equipment where a 32-to-175 Mbps NRZ interface must remain synchronized over distance, cable, or optical conversion. The principal design consideration is exposed-pad thermal management. Place input and output decoupling capacitors close to their associated supply and clock pins, route high-speed traces with controlled impedance, and connect the exposed thermal pad to a properly sized ground or power plane according to the manufacturer pin-description and layout guidance. Validate loop bandwidth, jitter tolerance, and output jitter in the complete channel rather than relying on the nominal data-rate range alone. This product page combines the device’s operating envelope, package details, verified pricing structure, same-family replacement candidates, comparison parameters, and implementation guidance. It also distinguishes confirmed drop-in candidates from lower-power or functionally similar devices whose exact electrical and pin-level compatibility still requires schematic-level review.

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SY87700LHI

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.

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SY87700LSI

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.

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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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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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