SY87701LHG-TR

Application Specific Clock/Timing Overview

The SY87701LHG-TR is a Clock and Data Recovery (CDR) integrated circuit manufactured by Microchip Technology, operating on a 3.3V supply within an industrial temperature range of –40°C to +85°C. It supports data rates from 32Mbps up to 1.25Gbps for NRZ streams. The device features two on-chip PLLs for clock generation and recovery, selectable reference frequencies, and differential PECL high-speed serial I/O. It complies with Bellcore, ITU/CCITT, and ANSI specifications for SONET/SDH, ATM, Fibre Channel, and Gigabit Ethernet applications.

Application Specific Clock/Timing Feature Summary

• Clock and data recovery for 32Mbps to 1.25Gbps NRZ data streams
• Two on-chip PLLs: one for clock generation and another for clock recovery
• Differential PECL high-speed serial I/O with built-in line receiver inputs
• Link fault indication and ECL 100k compatible I/O

Application Specific Clock/Timing Applications

• SONET/SDH/ATM OC-1, OC-3, OC-12, OC-24
• Fibre Channel, Escon, SMPTE 259
• Gigabit Ethernet/Fast Ethernet

Application Specific Clock/Timing Procurement Notes

Verify the package type matches the required design; the datasheet notes that the 28-pin SOIC variant is not recommended for new designs. Confirm lead finish specifications if RoHS compliance is mandatory, as standard versions may use Sn-Pb while 'G' suffixes indicate Pb-Free options. Check humidity sensitivity levels and storage conditions prior to assembly.

Application Specific Clock/Timing Selection Notes

Select this component for high-speed serial applications requiring protocol-independent clock recovery up to 1.25Gbps. Ensure the system can accommodate differential PECL signaling and provides appropriate loop filter components for the PLLs. Consider the SY87701AL for lower power requirements in new designs.

Application Specific Clock/Timing Part Context

The SY87701LHG-TR belongs to the SY87701L family of CDR ICs originally developed by Micrel, Inc., which was later acquired by Microchip Technology. The 'HG' suffix indicates a 32-pin EPAD-TQFP package with Pb-Free finish, and '-TR' denotes tape and reel packaging.

Application Specific Clock/Timing Replacement Considerations

The datasheet recommends using the SY87701AL for new designs due to lower power consumption. Verify pin compatibility and electrical characteristics when substituting between different package types or voltage variants.