SY87700LZG - 175Mbps AnyRate CDR | Microchip Technology
MPN： SY87700LZG ✓ 啟用中SY87700LZG 概覽
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.
直接替換替代品，適用於 SY87700LZG — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此系列的變體
與下列產品可直接替換的同系列型號： SY87700LZG （相同外形與佔位） — 差異在於 Package, Product Type.
此產品無可直接替換的替代品。
申請替代品SY87700LZG 規格
| Product Type | AnyRate clock and data recovery IC |
| Minimum Data Rate | 32 Mbps |
| Maximum Data Rate | 175 Mbps |
| Supply Voltage Option | 3.3 V |
| Supply Voltage Option | 5 V |
| Data Format | NRZ |
| Clock Outputs | 1 output |
| PLL Count | 2 on-chip PLLs |
| PLL Functions | 1 clock-generation PLL and 1 clock-recovery PLL |
| Application | Ethernet, SONET/SDH, and ATM serial links |
| 封裝 | 28-pin SOIC, 7.50 mm width |
| 安裝類型 | Surface mount |
| Maximum Input Data Rate | 175 Mbps |
SY87700LZG 28-pin soic, 7.50 mm width 腳位配置指南
SY87700LZG（28-pin soic, 7.50 mm width 封裝）的腳位配置。 腳位編號、功能與連接圖定義於製造商資料手冊中。請參閱該手冊以取得確切的封裝尺寸與焊接指引。
無詳細腳位定義資料： SY87700LZG.
請參閱 資料表 以查看完整腳位配置。
典型應用
SY87700LZG 適用於 6 應用s: SONET/SDH Line-Card Clock Recovery, ATM Network Interface Timing, Ethernet Serial-Link Recovery, Telecommunications Backplane Interfaces, FPGA-Assisted Serial Receivers, Embedded Telecommunications Timing.
SONET/SDH Line-Card Clock Recovery
The SY87700LZG fits SONET/SDH line-card receivers that need to recover a usable clock from an NRZ serial stream at rates from 32 Mbps to 175 Mbps. Its clock-recovery PLL and separate clock-generation PLL allow the receiver to reconstruct timing before forwarding data to the system logic. The 28-pin SOIC package also supports conventional surface-mount PCB assembly. Design the input and output paths for the line rate and review jitter, skew, and supply requirements in the manufacturer timing diagrams.
推薦
ATM Network Interface Timing
The SY87700LZG is appropriate for ATM interface blocks whose receiver must extract clock and data from an NRZ serial link within the supported 32 Mbps to 175 Mbps range. Placing the recovery function beside the serial transceiver can reduce timing complexity in the host FPGA or ASIC and provide a dedicated recovered clock to downstream logic. The device's one-output arrangement suits designs requiring one recovered timing reference. Confirm the required ATM line rate, clock architecture, jitter margin, and exact pin assignments before layout release.
推薦
Ethernet Serial-Link Recovery
The SY87700LZG can support legacy or rate-specific Ethernet interfaces that transmit NRZ data within the IC's 32 Mbps to 175 Mbps operating range. It provides a dedicated path for clock and data recovery, allowing a receiving FPGA or ASIC to operate from a clock reconstructed at the interface boundary. This arrangement can simplify timing distribution inside a communications card. The actual Ethernet standard, line coding, source-synchronous behavior, and required jitter performance must be verified against the manufacturer timing characteristics before implementation.
推薦
Telecommunications Backplane Interfaces
The SY87700LZG is suitable for older telecommunications backplanes where an NRZ serial channel operates at no more than 175 Mbps and must deliver recovered timing to line-card logic. Its dual-PLL architecture separates clock generation from clock recovery, while the 28-pin SOIC package simplifies assembly onto established communication boards. Backplane implementations should emphasize controlled impedance, short clock routes, ground-plane continuity, and isolation between noisy switching stages. Verify connector loss, skew budget, jitter tolerance, and the required line rate before selecting the device.
推薦
FPGA-Assisted Serial Receivers
The SY87700LZG can offload clock and data recovery from an FPGA when the incoming NRZ stream remains within the supported 32 Mbps to 175 Mbps range. The dedicated recovery function supplies a local timing reference, reducing the need for the FPGA to implement a complete CDR in fabric. This can simplify firmware and place-and-route work in rate-specific communications equipment. Evaluate whether the link's jitter, latency, loss-of-signal behavior, and clock-quality requirements fit the device before transferring timing responsibility away from the FPGA.
推薦
Embedded Telecommunications Timing
The SY87700LZG can be incorporated into embedded communication equipment that receives NRZ data at a fixed rate between 32 Mbps and 175 Mbps and requires local clock recovery. Its two-PLL architecture provides separate paths for clock generation and recovery, supporting a structured timing design within the receiving subsystem. The 28-pin SOIC package is useful for boards built around established surface-mount assembly processes. System designers should confirm the power-supply level, input thresholds, recovered-clock characteristics, and startup behavior against the manufacturer electrical specifications.
推薦
推薦產品摘要
工程參考資料，適用於 SY87700LZG — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 |
|---|---|
| Product Type | AnyRate clock and data recovery IC |
| Minimum Data Rate | 32 Mbps |
| Maximum Data Rate | 175 Mbps |
| Supply Voltage Options | 3.3 V and 5 V |
| Data Format | NRZ |
| Clock Outputs | 1 output |
| PLL Architecture | 2 on-chip PLLs: 1 for clock generation and 1 for clock recovery |
| Package | 28-pin SOIC, 7.50 mm width |
| Brand | Microchip Technology |
| Target Applications | Ethernet, SONET/SDH, and ATM |
主要差異化特點
- AnyRate recovery across a broad legacy serial-link range (對比SY87700ALHG)
- Separate clock-generation and clock-recovery PLLs (對比SY87700LHG)
- Single-output configuration in a compact SOIC (對比SY87700ALHG)
設計說明
Place the manufacturer-recommended input, output, and bypass capacitors adjacent to their associated SY87700LZG pins. Keep the recovered-clock route short and continuous, and avoid adding test pads or branch stubs near high-speed outputs unless their impedance effects have been evaluated. Connect each ground reference to a low-impedance ground plane so clock and data paths retain a stable return current.
Treat the recovered clock as a timing signal rather than ordinary low-frequency logic. Use a continuous reference plane, controlled impedance where the trace rate requires it, and matched-length routing when the downstream device defines a source-synchronous interface. Review data-to-clock skew and jitter against the receiver requirements; the nominal 175 Mbps ceiling alone does not guarantee adequate timing margin on a particular board.
Select either the 3.3 V or 5 V supply configuration explicitly and follow the associated external circuitry and decoupling requirements. Verify the input voltage, output levels, operating limits, and power behavior against the manufacturer electrical-characteristics table. Keep switching-regulator loops and high-current paths away from the clock and data inputs to minimize supply-induced jitter on the recovered timing signal.
Do not treat the lower-power SY87700AL family as a board-level substitute merely because it serves a similar timing function. The documented SY87700ALHG uses a 32-pin TQFP package with an exposed pad, whereas the SY87700LZG uses a 28-pin SOIC. Also confirm that the link rate remains between 32 Mbps and 175 Mbps and that the required clock-output behavior matches the system architecture.
合規資訊
No definitive compliance declarations for the exact SY87700LZG ordering code were included in the current product information.
