SY87729LHI

Application Specific Clock/Timing Overview

The SY87729LHI is a 3.3V AnyClock fractional-N synthesizer generating differential PECL reference frequencies from 10MHz to 365MHz using a single 27MHz reference oscillator. It supports protocols including OC-1, OC-3, OC-12, OC-48, ATM, Gigabit Ethernet, Fast Ethernet, Fibre Channel, and InfiniBand. The device features a MicroWire interface for configuration and exceeds BellCore/ITU jitter specifications. It operates within an ambient temperature range of -40°C to +85°C in a 32-pin EPAD-TQFP package.

Application Specific Clock/Timing Feature Summary

• Fractional-N synthesis from 10MHz to 365MHz with a single 27MHz reference
• Generates exact frequencies for common transport protocols (OC-1/3/12/48, ATM, Gigabit Ethernet, Fibre Channel)
• Programmable via standard 3-wire MicroWire interface
• Exceeds BellCore and ITU jitter generation specifications

Application Specific Clock/Timing Applications

• Metro access systems
• Transponders
• SONET/SDH/ATM-based transmission systems
• Fiber optic test equipment
• Broadband cross-connects

Application Specific Clock/Timing Procurement Notes

Verify the specific suffix 'HI' against official Micrel documentation, as the datasheet lists 'HY' and 'HYTR'. Confirm current availability status directly with the manufacturer or authorized distributors, as lead times may vary.

Application Specific Clock/Timing Selection Notes

Ensure the design utilizes a 27MHz reference clock input. Verify that the required output frequency falls within the 10MHz to 365MHz range. Confirm compatibility with the MicroWire control interface and check that the 32-pin EPAD-TQFP package fits the PCB layout constraints.

Application Specific Clock/Timing Part Context

The SY87729L is part of the AnyClock family designed for rate-independent frequency synthesis. It is often paired with Micrel's SY87721L CDR to generate precise reference clocks for data recovery units in high-speed serial data streaming applications.

Application Specific Clock/Timing Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation.