SY87739LHI

Application Specific Clock/Timing Overview

The SY87739LHI is a protocol-transparent, fractional-N frequency synthesizer manufactured by Microchip Technology. It generates differential PECL output frequencies ranging from 10MHz to 729MHz using a single 27MHz reference oscillator. The device supports common data transport protocols and enables the SY87721L CDR to lock to any baud rate between 28Mbps and 2.7Gbps. It operates within an ambient temperature range of -40°C to +85°C and requires a supply voltage of 3.3V ±5%. Configuration is managed via a MicroWire interface.

Application Specific Clock/Timing Feature Summary

• Protocol-transparent fractional-N synthesizer generating 10MHz to 729MHz from a 27MHz reference
• Generates exact frequencies for standard protocols including OC-1, OC-3, OC-12, OC-48, ATM, Gigabit Ethernet, Fast Ethernet, Fibre Channel, 1394, InfiniBand, and proprietary optical transport
• Exceeds BellCore and ITU jitter generation specifications
• Programmable via a simple 3-wire MicroWire interface

Application Specific Clock/Timing Applications

• Metro access systems
• Transponders
• Multiplexers (access, Add Drop Mux)
• SONET/SDH/ATM-based transmission systems and test equipment
• Fiber optic test equipment

Application Specific Clock/Timing Procurement Notes

Verify the ordering suffix when sourcing components. The 'HI' suffix indicates an H32-2 package with industrial operating range (-40°C to +85°C) and Sn-Pb lead finish. Ensure compatibility with existing assembly processes regarding lead composition if transitioning from Pb-free variants.

Application Specific Clock/Timing Selection Notes

Select this component for applications requiring precise clock synthesis for serial data streaming where input rates vary or are unknown. It is suitable for designs needing support for multiple standards like SONET/SDH and Ethernet without multiple oscillators. Verify that the system can accommodate the required external loop filter components for both the fractional-N and wrapper synthesizers.

Application Specific Clock/Timing Part Context

The SY87739LHI belongs to the SY87739L AnyClock family of fractional-N synthesizers. This series is designed to provide flexible clocking solutions for high-speed serial data applications, replacing the need for multiple fixed-frequency oscillators in complex communication systems.

Application Specific Clock/Timing Replacement Considerations

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