SY87721LHG - 2.7Gbps AnyRate CDR | Microchip Technology
MPN: SY87721LHG ✓ ActiveSY87721LHG Overview
An AnyRate clock and data recovery unit is a specialized timing IC that separates clock information from a serial data stream and reconstructs a clean, phase-aligned output clock. In the broader semiconductor hierarchy, it belongs to the clock and timing IC family, where clock and data recovery ICs support high-speed serial communication, optical transport, storage networks, and legacy telecommunications infrastructure.
The principal operating parameters are a 3.3 V supply, a minimum line rate of 28 Mbps, a maximum line rate of 2.7 Gbps, and one recovered output. Its AnyRate architecture is intended to accommodate widely different stream rates without requiring a separate fixed-rate recovery design for every protocol. The integrated clock multiplier adds clock-generation capability within the same recovery system, reducing the need for additional clock support in suitable designs.
The manufacturer describes the device for Ethernet, SONET/SDH, ATM, Fibre Channel, and other high-speed serial applications. These systems require deterministic clock recovery because upstream switching, line coding, transmission, and reception can introduce timing offsets and jitter. By recovering data and clock together, the SY87721LHG supports alignment at the receiver while the recovered clock can drive downstream circuitry.
Typical uses include optical network terminal equipment, Fibre Channel links, ATM interfaces, SONET/SDH transport paths, and clock-recovery blocks within Gigabit Ethernet designs. The 2.7 Gbps upper rate covers legacy high-speed serial links, while the 28 Mbps lower limit allows the recovery function to cover a broad rate range.
Designers should follow the manufacturer datasheet for the complete pin-description table, reference circuitry, loopback arrangement, and exposed-pad land pattern. Particular attention is required for high-speed differential routing, controlled clock topology, power and ground distribution, and thermal management of the exposed pad. The absence of a high-frequency switching stage does not eliminate return-path and supply-noise concerns.
This product page combines the verified operating limits, package information, application context, sourcing workflow, and structured engineering guidance. It also distinguishes confirmed characteristics from details that must be established from the complete manufacturer datasheet before schematic capture, signal-integrity simulation, or production release.
Drop-in alternatives for SY87721LHG — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
No drop-in alternatives available for this product.
Request AlternativesSY87721LHG Specifications
| Device Type | AnyRate clock and data recovery unit with integrated clock multiplier |
| Supply Voltage | 3.3 V |
| Minimum Data Rate | 28 Mbps |
| Maximum Data Rate | 2.7 Gbps |
| Recovered Clock Output Count | 1 output |
| Multiplexer Output Count | 1 output |
| Package | 64-pin TQFP with exposed pad |
| Package Body Size | 10 mm x 10 mm |
| Mounting Type | Surface mount |
| Application Category | Application Specific Clock/Timing |
| Ethernet Support | Supported |
| SONET/SDH Support | Supported |
| ATM Support | Supported |
| Fibre Channel Support | Supported |
SY87721LHG 10 mm x 10 mm Pin Configuration Guide
Pin configuration for SY87721LHG (10 mm x 10 mm package). Pin numbering, functions, and connection diagrams are defined in the manufacturer datasheet. Refer to it for the exact footprint and soldering guidelines.
No detailed pinout data available for SY87721LHG.
Refer to the datasheet for full pin configuration.
Typical Applications
SY87721LHG is suitable for 6 applications: Gigabit Ethernet Receiver Timing, Fibre Channel Interface Timing, SONET/SDH Transport Recovery, OC-12 and OC-48 Optical Transport, ATM Interface Recovery, Fast Ethernet and Multirate Transmission.
Gigabit Ethernet Receiver Timing
The Microchip Technology SY87721LHG fits Gigabit Ethernet receiver paths that require extraction of a usable clock from a high-speed serial data stream. Its AnyRate architecture covers 28 Mbps through 2.7 Gbps, allowing one recovery function to address multiple Ethernet-related rates when the protocol configuration permits it. The 3.3 V device separates clock and data recovery while providing one output for downstream circuitry. According to the manufacturer datasheet, Gigabit Ethernet is a supported application. The implementation should preserve controlled differential routing, provide the specified reference and decoupling arrangements, and verify acquisition behavior, jitter tolerance, and the recovered-clock phase at the target data rate.
Fibre Channel Interface Timing
The SY87721LHG is suitable for Fibre Channel interfaces where a receiver must establish stable timing before the recovered data reaches a protocol or forwarding layer. The device supports data rates from 28 Mbps to 2.7 Gbps and includes an integrated clock multiplier, allowing clock recovery and clock support to be considered together. According to the manufacturer datasheet, both Fibre Channel and 2x Fibre Channel are identified as supported streams. Circuit implementation must follow the datasheet reference design, including the required routing, supply connections, reference configuration, and exposed-pad thermal treatment. Confirm jitter and acquisition requirements for the exact Fibre Channel rate before production use.
SONET/SDH Transport Recovery
The SY87721LHG can support receiver timing in SONET/SDH transport equipment because the manufacturer identifies SONET/SDH among its target applications. Its AnyRate clock and data recovery function operates from 28 Mbps to 2.7 Gbps and includes an integrated clock multiplier, making it useful where multiple transport-related rates share a common timing architecture. The 3.3 V, 64-pin TQFP-with-exposed-pad device requires disciplined high-speed layout and a thermal path through the exposed pad. Engineers should verify the applicable line rate, reference-clock arrangement, jitter limits, and acquisition timing in the manufacturer datasheet before approving the design.
OC-12 and OC-48 Optical Transport
The SY87721LHG is intended for clock recovery in OC-12 and OC-48 transport systems, where serial data must be paired with a recovered timing reference before downstream processing. According to the manufacturer datasheet, the device recovers any clock and data from the listed transport streams and operates across a 28 Mbps-to-2.7 Gbps range. Its one-output architecture and integrated clock multiplier can simplify timing-block planning when the required configuration is supported. The design must preserve matched data and clock paths, minimize discontinuities and crosstalk, and use the manufacturer's exposed-pad and reference-circuit details. Protocol-specific jitter margins remain the controlling qualification criteria.
ATM Interface Recovery
The Microchip Technology SY87721LHG addresses clock-and-data recovery requirements in ATM receiver interfaces. According to the manufacturer datasheet, ATM is an explicitly supported application, and the AnyRate architecture spans 28 Mbps through 2.7 Gbps. This allows designers to use the device across compatible ATM stream rates when their acquisition and timing requirements align. The 3.3 V device provides one recovered output and fits a 64-pin TQFP-with-exposed-pad package. Use the reference schematic and pin-description table to define the serial input path, reference clock, supplies, and exposed pad. Validate loop latency, jitter tolerance, and recovered-clock quality under the actual ATM traffic conditions.
Fast Ethernet and Multirate Transmission
The SY87721LHG is suitable for Fast Ethernet and other multirate serial transmission blocks that benefit from a broad recovery range. Its 28 Mbps minimum and 2.7 Gbps maximum rates allow one AnyRate timing component to address multiple stream conditions when the protocol masks and configuration rules permit. The integrated clock multiplier can consolidate supporting clock functions, while the single output defines how the recovered signal is routed downstream. According to the manufacturer datasheet, Fast Ethernet is a supported application. Before layout approval, engineers should check lock acquisition, reference requirements, jitter behavior, differential impedance, and the thermal connection of the 10 mm by 10 mm exposed-pad package.
Engineering reference data for SY87721LHG — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product |
|---|---|
| Device Type | AnyRate clock and data recovery with integrated clock multiplier |
| Supply Voltage | 3.3 V |
| Minimum Data Rate | 28 Mbps |
| Maximum Data Rate | 2.7 Gbps |
| Output Count | 1 output |
| Package | 64-pin TQFP with exposed pad, 10 mm x 10 mm |
| Brand | Microchip Technology |
| Clock Multiplier | Integrated |
| Supported Applications | Ethernet, SONET/SDH, ATM, Fibre Channel, OC-12 and OC-48 |
Key Differentiators
- Broad AnyRate operating span (vs Fixed-rate clock and data recovery devices)
- Integrated clock multiplier (vs Separate recovery and clock-generation blocks)
- Single-output architecture in a compact exposed-pad package (vs Multi-output recovery devices)
Design Notes
Use the manufacturer datasheet as the authority for the 64-pin TQFP-with-exposed-pad footprint and pin assignments. Keep the serial data and clock paths short, continuous, and referenced to a stable ground plane, and preserve the recommended differential impedance. Do not substitute a generic 64-pin TQFP land pattern because exposed-pad dimensions, thermal-via requirements, and pin mapping must match the exact package drawing.
Place the manufacturer-recommended bypass capacitors at the device supply and ground pins, with each capacitor connected through the shortest practical path. Keep switching-node and high-energy clock-routing copper away from recovery inputs and reference paths. Although the SY87721LHG runs from 3.3 V, its clock-recovery accuracy can still be affected by supply noise, ground bounce, and return-path discontinuities, so validate the power network across the full input data-rate range.
Treat the exposed pad as both an electrical connection and a thermal path. Follow the datasheet land pattern and use the recommended via arrangement beneath the package where space permits. Estimate the junction-temperature rise from actual supply current, supply voltage, ambient temperature, and the package thermal model, then verify it with a thermal test in the final enclosure. Avoid assuming that the 10 mm by 10 mm package dissipates heat efficiently without exposed-pad soldering and copper support.
Validate input eye quality, jitter, insertion loss, return loss, and package-related degradation across the intended 28 Mbps-to-2.7 Gbps range. The AnyRate architecture supports a broad rate range, but that feature does not remove channel or timing constraints. Compare receiver sensitivity, acquisition time, clock-multiplier stability, and protocol masks at each design rate, and include loss, connectors, vias, and clock-routing skew in the simulation model.
Compliance Information
Compliance status was not established by the available manufacturer-page and product-listing information. Confirm RoHS, REACH, automotive qualification, lead-free, halogen-free, and conflict-minerals documentation for the exact ordering code before qualification.
