SY87721LHI - 2.7Gbps AnyRate CDR | Microchip Technology
MPN: SY87721LHI ✓ Hoạt độngSY87721LHI Tóm tắt
A clock and data recovery IC, commonly called a CDR, reconstructs a stable timing reference from a serial data stream that may have accumulated clock, phase, or frequency uncertainty. The CDR sits within the physical-layer signal path between a high-speed transceiver and the digital logic that processes the recovered payload. The SY87721LHI combines this timing-recovery function with an integrated clock multiplier for systems requiring both recovered data and a derived reference clock.
Key features include support for data rates from 28 Mbps through 2.7 Gbps, operation from a single 3.3 V supply, and one recovered output. Its AnyRate architecture is designed for SONET/SDH, ATM, Gigabit Ethernet, Fast Ethernet, Fibre Channel, IEEE 1394, and InfiniBand-related links. The device is intended for telecommunications, optical-networking, storage-network, and high-speed serial-interface equipment where the transmitter and receiver clock domains can differ.
The integrated clock multiplier supports systems in which a recovered clock must be translated into another required operating frequency. This avoids assigning a separate multiplier to a design when the link interface already contains a suitable recovery and clock-generation block. The device is positioned for endpoint and line-card designs requiring deterministic serial-clock recovery over a broad operating-rate range rather than a fixed-rate-only recovery function.
Typical implementations include SONET/SDH line interfaces, ATM and Gigabit Ethernet backplanes, Fibre Channel links, IEEE 1394 connections, and InfiniBand equipment. In each case, the circuit interfaces with high-speed serialized data and supplies timing that must remain aligned with the incoming signal. Board-level design should preserve high-speed signal integrity because jitter, impedance discontinuities, and return-path discontinuities directly affect recovery performance.
For a new layout, use the manufacturer pin-description table to assign power, ground, serial-data, reference-clock, and multiplier connections exactly. Place bypass capacitors close to the supply pins and keep the exposed thermal and electrical pad connected to a low-impedance ground plane according to the package land pattern. Confirm that the selected reference-clock source, loop filter, and external components support the intended data rate before production release.
This product page combines the published operating limits with practical guidance for clock-and-data recovery, package implementation, and interface selection. It also distinguishes verified drop-in replacements from parts that merely share a broad communication function, helping engineers confirm footprint, pin assignment, and rate compatibility before modifying an existing PCB.
Bộ thay thế dễ dàng lắp đặt cho SY87721LHI — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Không có bộ thay thế dễ dàng lắp đặt sẵn có cho sản phẩm này.
Yêu cầu các bộ thay thếSY87721LHI Thông số kỹ thuật
| Product Type | AnyRate clock and data recovery IC with integrated clock multiplier |
| Minimum Data Rate | 28 Mbps |
| Maximum Data Rate | 2.7 Gbps |
| Điện áp cung cấp | 3.3 V |
| Output Count | 1 output |
| Clock Multiplier | Integrated |
| Hộp | 64-TQFP-EP, 10 mm x 10 mm |
| Kiểu lắp đặt | Surface mount |
| Device Category | Application-specific clock and timing IC |
| Protocol Support | OC-12, OC-48, ATM, Gigabit Ethernet, Fast Ethernet, Fibre Channel, IEEE 1394 and InfiniBand |
| Số lượng chân | 64 pins |
| Exposed Pad | Present |
Hướng dẫn cấu hình chân SY87721LHI 64-tqfp-ep, 10 mm x 10 mm
Cấu hình chân cho SY87721LHI (64-tqfp-ep, 10 mm x 10 mm gói). Số thứ tự chân, chức năng và sơ đồ kết nối được xác định trong tài liệu thông số kỹ thuật của nhà sản xuất. Tham khảo nó để biết footprint và hướng dẫn hàn chính xác.
Không có dữ liệu chân cụ thể sẵn có cho SY87721LHI.
Tham khảo: tài liệu kỹ thuật cho cấu hình chân đầy đủ.
Ứng dụng tiêu biểu
SY87721LHI phù hợp cho 6 Áp dụngs: SONET/SDH Line Interfaces, ATM and Gigabit Ethernet Links, Fibre Channel Backplanes, IEEE 1394 Serial Interfaces, InfiniBand Network Interfaces, Telecom Line-Card and Backplane Equipment.
SONET/SDH Line Interfaces
The SY87721LHI fits SONET and SDH line-interface circuits that require clock and data recovery from serial links operating within its 28-Mbps-to-2.7-Gbps range. Its integrated multiplier can support systems needing a derived clock in addition to recovered timing. Place the recovery circuit close to the high-speed serial interface, follow the manufacturer reference layout, and provide low-impedance 3.3 V bypassing. Confirm the target OC rate, reference-clock frequency, jitter budget, and loop-filter requirements during schematic review.
ATM and Gigabit Ethernet Links
The SY87721LHI is appropriate for ATM and Gigabit Ethernet interface designs where a 3.3 V AnyRate recovery function covers rates from 28 Mbps to 2.7 Gbps. The device can recover timing from the incoming serial stream and provide an integrated clock-multiplication resource for adjacent logic. Layout the input and output paths as controlled-impedance nets, preserve continuous return paths, and keep the device close to the transceiver interface. Validate lock range, jitter tolerance, and clock-quality requirements for the selected Ethernet or ATM variant.
Fibre Channel Backplanes
The SY87721LHI can support Fibre Channel backplane and adapter designs with serial data rates inside the documented 28-Mbps-to-2.7-Gbps operating window. Clock and data recovery is essential when the transmitted bit stream and receiving logic do not share a stable phase relationship. Use short high-speed routes, avoid unnecessary layer transitions, and validate the package exposed pad as part of both electrical return and thermal design. Check the standard-specific jitter and lock requirements before qualification testing.
IEEE 1394 Serial Interfaces
The SY87721LHI suits IEEE 1394 interface circuits requiring AnyRate timing recovery across the supported 28-Mbps-to-2.7-Gbps range. It allows one recovery architecture to address multiple serial operating rates while supplying one output and an integrated clock multiplier. Preserve signal continuity through the transceiver, provide adequate return-path connectivity, and use the exact manufacturer reference layout for the 64-pin TQFP exposed-pad footprint. Confirm protocol timing and loss-of-signal requirements for the target 1394 variant.
InfiniBand Network Interfaces
The SY87721LHI can be used in InfiniBand interface designs operating below its 2.7-Gbps maximum rate, with broad recovery coverage beginning at 28 Mbps. It supports clock-and-data recovery and clock multiplication in a single 3.3 V IC. High-speed layout quality remains critical because impedance variation and jitter affect the ability to recover clean timing. Route the serial channel with uninterrupted reference planes, minimize stubs, and verify the external loop filter and clocking architecture against the selected InfiniBand operating condition.
Telecom Line-Card and Backplane Equipment
The SY87721LHI fits telecommunications line cards that combine SONET/SDH, ATM, Ethernet, or Fibre Channel links and need broad clock-recovery coverage in limited board area. Its 3.3 V operation, 28-Mbps-to-2.7-Gbps range, one output, and integrated multiplier reduce the need for separate timing components. Place bypass capacitors close to the device, connect the exposed pad using the recommended via pattern, and preserve controlled-impedance routing. Validate each port independently because link-rate and jitter requirements can differ within one line card.
Dữ liệu tham khảo kỹ thuật cho SY87721LHI — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này |
|---|---|
| Manufacturer | Microchip Technology |
| Package | 64-TQFP-EP, 10 mm x 10 mm |
| Supply Voltage | 3.3 V |
| Minimum Data Rate | 28 Mbps |
| Maximum Data Rate | 2.7 Gbps |
| Output Count | 1 output |
| Clock Multiplier | Integrated |
| Device Category | Application-specific clock and timing IC |
| Supported Applications | OC-12, OC-48, ATM, Gigabit Ethernet, Fast Ethernet, Fibre Channel, IEEE 1394 and InfiniBand |
Bảo phân biệt quan trọng
- Broad AnyRate recovery range in one device (vsNo confirmed drop-in alternative)
- Clock recovery and multiplication combined (vsNo confirmed drop-in alternative)
- Single 3.3 V implementation (vsNo confirmed drop-in alternative)
Ghi chú thiết kế
Follow the manufacturer reference layout for the 64-pin TQFP exposed-pad package. Keep the exposed pad connected to the ground plane with the recommended via pattern, place 3.3 V bypass capacitors close to the supply pins, and preserve continuous return paths beneath high-speed data routes. Avoid stubs and unnecessary layer transitions because the recovery circuit must distinguish the incoming serial stream from local noise and timing uncertainty.
Treat every serial data and clock connection as a controlled-impedance transmission line when the operating rate approaches 2.7 Gbps. Use the connector, package, and board construction recommended for the target protocol, maintain matched length relationships defined by the interface standard, and avoid split planes beneath the channel. Validate eye closure, jitter, and reflection behavior with the actual transceiver and enclosure configuration rather than relying only on simulation.
Do not select the device solely because both circuits are marketed as clock multipliers. Confirm the reference-clock frequency, supported recovery range, loop-filter requirements, lock behavior, output configuration, and pin assignments for every candidate. The SY87721LHI operates from 28 Mbps to 2.7 Gbps with one output and an integrated multiplier; any substitute must meet those functional and electrical requirements as well as the 64-pin TQFP footprint.
Thông tin tuân thủ
The manufacturer documentation link identifies the device as a Micrel Semiconductor clock and data recovery IC. Compliance and automotive qualification statements require confirmation for the exact ordering code.
