SY87729LHY-TR

Application Specific Clock/Timing Overview

The SY87729LHY-TR is a 3.3V AnyClock fractional-N synthesizer from Microchip Technology, operating in an industrial temperature range of -40°C to +85°C. It generates differential PECL reference frequencies between 10MHz and 365MHz from a single 27MHz reference oscillator. The device features a typical power supply current of 205mA at 3.3V. It utilizes a 32-bit MicroWire interface for configuration and includes a LOCKED output pin to indicate proper PLL synchronization. The component is housed in a 32-pin EPAD-TQFP package with a Pb-free bar-line indicator.

Application Specific Clock/Timing Feature Summary

• Generates exact reference frequencies for common transport protocols (e.g., OC-1, OC-3, Gigabit Ethernet) without gaps
• Enables SY87721L CDR to lock onto any data rate within its 28Mbps to 2.7Gbps range
• Exceeds BellCore and ITU jitter generation specifications
• Programmable via standard 3-wire MicroWire interface

Application Specific Clock/Timing Applications

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

Application Specific Clock/Timing Procurement Notes

Verify the specific ordering suffix TR indicates tape and reel packaging. Confirm the H32-2 package marking matches the 32-Pin ePad TQFP physical form factor. Ensure the industrial temperature rating (-40°C to +85°C) aligns with system environmental requirements before finalizing procurement.

Application Specific Clock/Timing Selection Notes

Select this component when a single reference source must drive multiple downstream devices or support variable data rates. It is suitable for applications requiring precise frequency synthesis for protocols like Fibre Channel or InfiniBand. Ensure the design accommodates the required external loop filter components for both the fractional-N and wrapper synthesizers as specified in the datasheet.

Application Specific Clock/Timing Part Context

This part belongs to the SY87729L family of AnyClock synthesizers. It is specifically designed to work in tandem with Micrel's SY87721L combined CDR and CMU. The device solves issues related to generating valid output streams even when upstream signal edges are absent, providing a robust solution for transponder and multiplexer applications.

Application Specific Clock/Timing Replacement Considerations

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