SY87700LHG - 175Mbps AnyRate CDR | Microchip Technology
料号： SY87700LHG ✓ 量产中SY87700LHG 概述
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.
直接替换替代料： SY87700LHG ——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： SY87700LHG （相同外形与封装尺寸） ——差异在于 Package, Product Type, PLL Functions.
SY87700LHI
✅ 直接替换联系询价
SY87700ALHG
✅ 直接替换📋 参考替代料（不在目录中）
SY87700LZG
✅ 直接替换联系询价
查看数据手册 →SY87700LHG 规格参数
| Product Type | AnyRate clock and data recovery IC |
| Minimum Data Rate | 32 Mbps |
| Maximum Data Rate | 175 Mbps |
| 电源电压 | 3.3 V |
| 输出数量 | 1 output |
| PLL Count | 2 on-chip PLLs |
| Data Format | NRZ |
| Application Compatibility | SONET, SDH, ATM, and Ethernet applications |
| Clock Generation Function | Up to 175 Mbps |
| Clock Recovery Function | 32 Mbps to 175 Mbps |
| 封装 | 32-pin TQFP exposed-pad, 7 mm x 7 mm |
| 安装类型 | Surface mount |
SY87700LHG 32-pin tqfp exposed-pad, 7 mm x 7 mm 引脚配置指南
SY87700LHG（32-pin tqfp 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： SY87700LHG.
请参阅 数据手册 以查看完整引脚配置。
典型应用
SY87700LHG 适用于 6 应用s: SONET Telecom Interface, SDH Line Card Timing, ATM Equipment Clock Recovery, Ethernet Recovered-Clock Interface, Industrial Communication Interface, Telecommunications Test Equipment.
SONET Telecom Interface
The SY87700LHG fits legacy SONET telecommunications interfaces that require a recovered timing reference from an NRZ data stream. Its 32-to-175 Mbps AnyRate range and clock-recovery PLL allow a single timing architecture to address multiple tributary rates rather than requiring a separate CDR for every line speed. The recovered output supports downstream digital logic or another transmission block, while the second PLL provides clock-generation capability within the same timing subsystem. Design the external loop and filtering around the manufacturer’s recommended configuration, and verify jitter margin against the complete SONET path. Because the device provides only one recovered output, downstream clock distribution must account for fanout and loss.
推荐
SDH Line Card Timing
The SY87700LHG can support SDH line-card blocks that need stable timing regenerated from a serial NRZ data path. Its operation from 32 Mbps to 175 Mbps covers multiple telecom-oriented rates, while the dual-PLL architecture separates clock generation from clock recovery. This is useful when the board must both recover the incoming reference and produce another related clock without adding two unrelated timing ICs. The designer should validate the reference-clock frequency, acquisition behavior, and jitter specification against the SDH line rate and optical transceiver characteristics. Thermal and layout planning must also preserve low-noise clock behavior by keeping sensitive return paths close to the device ground network.
推荐
ATM Equipment Clock Recovery
The SY87700LHG is appropriate for legacy ATM equipment that recovers timing from an NRZ stream between 32 Mbps and 175 Mbps. Its AnyRate capability can simplify qualification across several related ATM interfaces, while the single output provides a defined recovered clock for the receiving logic. The internal clock-recovery PLL must be configured using the manufacturer’s recommended loop components and reference arrangement. Engineers should test acquisition time, jitter performance, and clock phase over the full intended operating range because nominal data-rate support does not guarantee equivalent performance in every topology. Keep supply decoupling and high-speed routing compact so switching activity in the surrounding line card does not degrade recovered-clock stability.
推荐
Ethernet Recovered-Clock Interface
The SY87700LHG can serve Ethernet-adjacent equipment that requires clock recovery from a 32-to-175 Mbps NRZ interface, particularly legacy or nonstandard network paths. The recovered-clock output can feed an endpoint, framer, or test instrument, while the separate generation PLL can support local timing functions. This capability is most useful where a standard Ethernet PHY does not expose or require the exact recovery behavior. Signal integrity remains critical: use controlled-impedance routing, minimize stub length, and keep the clock return path continuous through the ground plane. Validate the recovered clock against the Ethernet timing budget, including jitter, phase drift, and acquisition time under the expected traffic pattern.
推荐
Industrial Communication Interface
The SY87700LHG is useful in industrial communication equipment that terminates a 32-to-175 Mbps serial link and needs deterministic recovered timing. Industrial systems benefit from a dedicated timing block that separates clock recovery from downstream processing, especially across cables, backplanes, or optical conversion stages. The AnyRate operating range permits product-family reuse when several link rates share a board architecture. Design the interface around the manufacturer’s reference arrangement, preserve short return paths, and test operation across voltage and temperature corners. When long traces or imperfect sources are involved, add suitable line conditioning rather than expecting the CDR to compensate for excessive attenuation, deterministic jitter, or violations of its input data-rate limits.
推荐
Telecommunications Test Equipment
The SY87700LHG can be incorporated into telecommunications test equipment that must recreate or observe timing from NRZ traffic operating between 32 Mbps and 175 Mbps. Its dual-PLL arrangement and one recovered output provide a compact basis for a clock-generation and clock-recovery channel. In an instrument, the recovered clock may drive counters, logic analyzers, or programmable timing blocks, making low jitter and deterministic acquisition central to the measurement quality. Use short, impedance-controlled connections and isolate sensitive timing paths from noisy switching stages. Validate the instrument against known-good sources and account for the CDR’s acquisition behavior before interpreting small timing errors. The exposed-pad package also requires a stable thermal design to prevent drift as operating conditions change.
推荐
推荐产品汇总
工程参考数据： SY87700LHG ——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 | SY87700LHI | SY87700ALHG | SY87700LZG |
|---|---|---|---|---|
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Package | 32-TQFP exposed pad, 7 mm x 7 mm | 32-TQFP | 32-TQFP | 32-TQFP |
| Power Position | Original SY87700 device | Related SY87700 ordering variant | Lower-power SY87700A design | Related SY87700 ordering variant |
| Application Compatibility | SONET, SDH, ATM, and Ethernet applications | SONET and SDH clock timing | 3.3 V AnyRate clock and data recovery | Telecommunications timing |
关键差异点
- Original SY87700 architecture with AnyRate operation （对比 SY87700ALHG)
- Two-purpose timing integration （对比 SY87700LHI)
- Established 32-pin 7 mm by 7 mm exposed-pad package （对比 SY87700LZG)
设计说明
Place the SY87700LHG according to the manufacturer’s recommended 32-pin TQFP exposed-pad land pattern. Keep the data input, reference clock, and recovered-clock traces short, preserve a continuous return plane, and avoid routing them beneath unrelated switching stages. The exposed pad should use the electrical connection specified by the pin-description table while also providing uninterrupted copper for heat dissipation.
Use the manufacturer-recommended bypass-capacitor network at the supply pins and place the components close to the package power-entry points. Keep the return-current path within the ground plane rather than routing it through a split plane. Because the SY87700LHG contains a clock-generation PLL and a clock-recovery PLL, supply noise can affect timing behavior even when the recovered-clock frequency appears correct.
Treat the 32-to-175 Mbps NRZ input and recovered-clock output as controlled timing interfaces. Use impedance-controlled routing, minimize stubs and test pads, and obtain the input and output capacitance values from the manufacturer datasheet before finalizing terminations. Validate acquisition time, output jitter, and phase behavior with the actual source, cable or trace, and receiving load.
The exposed pad is the principal path for removing heat from the device. Provide a sufficiently large copper area with short thermal vias to the appropriate plane, and avoid cutting the pad away with aggressive board-out rules. Temperature rise depends on board copper, via count, airflow, and dissipation; evaluate those variables in a prototype instead of assuming the package drawing alone determines junction temperature.
合规信息
The manufacturer and distributor records do not provide explicit compliance declarations for this exact orderable MPN. Confirm RoHS, REACH, lead-free, halogen-free, conflict-minerals, and automotive qualification status using the current manufacturer product documentation before qualification.
