SY89809ALTH

Clock Buffers, Drivers Overview

The SY89809ALTH is a high-performance bus clock driver manufactured by Microchip Technology, part of the Precision Edge series. It features a 2:9 input-to-output ratio, accepting differential HSTL or LVPECL inputs and providing nine differential HSTL output pairs. Designed for low-voltage applications, it operates with a 3.3V core supply and an 1.8V output supply to minimize power consumption. The device supports maximum clock frequencies up to 500 MHz and ensures signal integrity through low part-to-part skew (max 200ps) and pin-to-pin skew (max 50ps). It is housed in a 32-TQFP package.

Clock Buffers, Drivers Feature Summary

• 2:9 differential fanout buffer with multiplexed HSTL/LVPECL input selection
• Nine differential HSTL output pairs driving 50Ω loads without offset voltage
• Low skew performance: 200ps max part-to-part and 50ps max pin-to-pin
• Synchronous Output Enable (OE) prevents runt clock pulses during activation

Clock Buffers, Drivers Applications

• High-performance personal computers
• Workstations requiring precise clock distribution
• Parallel processor-based systems
• High-performance computing environments

Clock Buffers, Drivers Procurement Notes

The SY89809ALTH is identified as obsolete and no longer manufactured. Verification of availability should focus on surplus distributors or alternative sources, as original manufacturer stock is unavailable. Check RoHS compliance status and moisture sensitivity level (MSL 3) before procurement for sensitive assembly processes.

Clock Buffers, Drivers Selection Notes

Select this component for designs requiring a single differential input to drive nine synchronized HSTL outputs. Ensure the design accommodates the 3.3V core and 1.8V I/O supply voltages. Verify that the 500 MHz frequency limit meets system requirements. Consider the synchronous OE feature if glitch-free enable/disable transitions are critical for the target application.

Clock Buffers, Drivers Part Context

This component belongs to the SY89809 family of clock drivers from Microchip Technology (formerly Micrel). It is categorized under Clock Buffers within the Clock & Timer ICs subcategory. The specific suffix 'ALTH' denotes the TQFP-32 package variant. It serves as a legacy solution for high-speed clock distribution in older high-performance computing architectures.

Clock Buffers, Drivers Replacement Considerations

Publicly confirmed substitute part numbers include the 853S031BYILF from Renesas Electronics Corporation, which is listed as a similar replacement.