SY87701VHH - 1.25Gbps Clock Recovery IC | Microchip
料号： SY87701VHH ✓ 量产中SY87701VHH 概述
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.
直接替换替代料： SY87701VHH ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： SY87701VHH （相同外形与封装尺寸） ——差异在于 Package.
SY87701VHC
✅ 直接替换联系询价
查看数据手册 →SY87701VHH 规格参数
| Device Type | Clock and Data Recovery (CDR) multiplexer IC |
| Maximum Data Rate | 1.25 Gbps |
| Minimum Data Rate | 32 Mbps |
| Recovered Clock Outputs | 1 output |
| Supply Voltage Options | 3.3 V or 5 V |
| Input Data Format | NRZ serial data |
| Primary Applications | Ethernet, SONET/SDH, ATM, OC-3, OC-12, and FDDI |
| 封装 | 32-pin TQFP with exposed pad, 7 mm x 7 mm |
| 安装类型 | Surface mount |
| Link Fault Indication | Integrated |
| Loss-of-Lock Behavior | PLL forced to lock to the local reference clock |
| Clock Generation | 32 Mbps to 1.25 Gbps from recovered or reference timing |
| Input Buffering | No external buffering required |
| I/O Compatibility | 100K ECL compatible |
SY87701VHH 32-pin tqfp with exposed pad, 7 mm x 7 mm 引脚配置指南
SY87701VHH（32-pin tqfp with exposed pad, 7 mm x 7 mm 封装）的引脚配置。 引脚编号、功能和连接图在制造商数据手册中定义。请参阅该手册以了解确切的封装尺寸和焊接指南。
暂无详细引脚数据： SY87701VHH.
请参阅 数据手册 以查看完整引脚配置。
典型应用
SY87701VHH 适用于 6 应用s: SONET/SDH Transport Equipment, ATM Network Interface Cards, Optical OC-3 and OC-12 Interfaces, Ethernet Receive and Retiming, FDDI Network Interface Equipment, High-Speed Network Test Equipment.
SONET/SDH Transport Equipment
The SY87701VHH fits legacy SONET/SDH transport interfaces because it recovers timing and clock signals from NRZ data streams operating from 32 Mbps to 1.25 Gbps. According to the Microchip SY87701V datasheet, its clock-recovery function and local-reference fallback behavior help maintain the correct recovered-clock frequency during loss-of-signal or loss-of-lock events. Place the device at the receive or multiplexing stage of the line card, and verify the required clock topology and I/O levels against the system design. The single recovered-clock output supports designs where one timing channel is required, while the 3.3 V or 5 V supply choices provide flexibility across telecommunications equipment generations.
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ATM Network Interface Cards
The SY87701VHH is applicable to ATM equipment requiring clock recovery and data retiming from high-speed NRZ streams. Its documented 32 Mbps to 1.25 Gbps range covers legacy ATM transport rates and allows the same timing architecture to be used across several interface sections. The integrated link fault indication function monitors received serial data and forces the PLL toward the local reference when the frequency test fails. This provides the system with deterministic timing during link impairment and a signal for fault handling. Confirm the board’s selected supply voltage and confirm that the single recovered-clock output matches the receiving subsystem.
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Optical OC-3 and OC-12 Interfaces
The SY87701VHH supports OC-3 and OC-12 interface designs by recovering a usable clock from incoming serial data and providing clock-generation capability over the stated 32 Mbps to 1.25 Gbps span. Microchip identifies these optical-transport formats as applications for the SY87701V family. In an optical receiver line card, the circuit can sit between the serial data path and downstream timing-sensitive logic. Its loss-of-signal and loss-of-lock handling helps preserve the expected recovered-clock frequency by referring to the local clock. Board-level implementation should follow the manufacturer’s high-speed layout guidance and exposed-pad land pattern.
推荐
Ethernet Receive and Retiming
The SY87701VHH can support Ethernet-oriented receive paths that need a recovered clock derived from serial NRZ data. Its maximum 1.25 Gbps operating rate and clock-generation capability fit legacy or line-card-oriented Ethernet implementations, while its data-retiming function is useful where downstream logic requires regenerated timing. The link fault indication circuit continuously monitors input integrity and uses the local reference when the received stream fails the frequency test. Integration requires attention to input logic levels, reference-clock routing, and controlled-imppedance traces. The 32-pin TQFP-EP footprint supports compact timing-dense boards when its exposed pad is properly connected.
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FDDI Network Interface Equipment
The SY87701VHH is identified for FDDI-related network timing applications because it recovers clock and data from an NRZ serial stream while operating within a 32 Mbps to 1.25 Gbps range. The device is useful in interface assemblies that require a regenerated clock for downstream logic and need defined behavior when the serial link fails. Its integrated link-fault detection and local-reference locking behavior reduce the risk of an uncontrolled recovered-clock frequency during loss conditions. In an FDDI board, connect the device according to the manufacturer’s reference topology, keep the reference and data paths short, and use the exposed-pad solder pattern specified for thermal performance and electrical grounding.
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High-Speed Network Test Equipment
The SY87701VHH can serve as the timing-recovery element in test equipment that receives or generates serial links up to 1.25 Gbps. Its recovered-clock output allows measurement and protocol-processing sections to work from timing derived from the data stream rather than relying entirely on an external clock. When the input fails the internal frequency test, the PLL locks to the local reference, giving the instrument a predictable timing reference while the fault is investigated. Use the manufacturer’s recommended input and output arrangements for the selected 3.3 V or 5 V configuration, and preserve short, properly terminated high-speed routes to maintain deterministic behavior on the test fixture or instrument board.
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推荐产品汇总
工程参考数据： SY87701VHH ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | SY87701VHC |
|---|---|---|
| Package | 32-pin TQFP-EP (7x7 mm) | 32-pin TQFP-EP (7x7 mm) |
| Brand | Microchip Technology | Microchip Technology |
| Device Type | Clock and Data Recovery (CDR) multiplexer IC | Clock and Data Recovery (CDR) multiplexer IC |
| Maximum Data Rate | 1.25 Gbps | 1.25 Gbps |
| Minimum Data Rate | 32 Mbps | 32 Mbps |
| Supply Voltage Options | 3.3 V or 5 V | 3.3 V or 5 V |
| Recovered Clock Outputs | 1 output | 1 output |
| Input Data Format | NRZ serial data | NRZ serial data |
| Link Fault Indication | Integrated | Integrated |
| Loss-of-Lock Behavior | PLL forced to lock to the local reference clock | PLL forced to lock to the local reference clock |
| Primary Applications | Ethernet, SONET/SDH, ATM, OC-3, OC-12, and FDDI | Ethernet, SONET/SDH, ATM, OC-3, OC-12, and FDDI |
| I/O Compatibility | 100K ECL compatible | 100K ECL compatible |
关键差异点
- Direct package-compatible timing replacement path （对比 SY87701VHC)
- Broad legacy high-speed interface support （对比 SY87701VHC)
- Deterministic reference fallback （对比 SY87701VHC)
设计说明
Use the exposed-pad land pattern specified by Microchip for the 32-pin TQFP-EP package. The exposed pad must be soldered to provide the intended thermal and electrical connection rather than left as an isolated copper island. Apply the manufacturer’s recommended paste volume and reflow profile so the pad voids remain within assembly limits. Keep the local reference-clock and high-speed serial traces short and route them over a continuous ground reference to minimize timing disturbance.
Follow the SY87701V datasheet when connecting the NRZ data inputs, reference clock, and recovered-clock output. Preserve the specified impedance environment and minimize discontinuities between the device and its connector or transceiver. The recovered clock is the principal timing reference for downstream logic, so routing it away from switching nodes and unrelated high-current paths is important. Review the external line-receiver and termination arrangements before finalizing the board topology.
Do not treat loss-of-signal or loss-of-lock as a normal recovered operating condition. The SY87701VHH forces the PLL to lock to the local reference when the received data fails its frequency test, which preserves clock frequency but does not restore lost payload. System fault logic should use the link-fault indication function to distinguish a reference-locked timing condition from healthy data reception. Also verify that the selected 3.3 V or 5 V configuration matches the complete interface design.
合规信息
No definitive RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status was established by the cited product documentation. Confirm the current declarations and the exact ordering code with the manufacturer before qualification.
