SY89221UHY-TR

Clock Buffers, Drivers Overview

The SY89221UHY-TR is a high-speed clock divider and LVPECL fanout buffer operating at 2.5V or 3.3V, capable of handling input frequencies up to 1.5GHz. It features four independently controlled output banks providing a total of 15 LVPECL outputs with programmable ÷1, ÷2, or ÷4 division ratios. The device includes a 2:1 multiplexer for dual differential inputs and utilizes a unique 3-pin input termination architecture compatible with AC- or DC-coupled signals as small as 100mV. Key electrical specifications include less than 1ps RMS random jitter, less than 1600ps propagation delay, and within-bank skew under 35ps.

Clock Buffers, Drivers Feature Summary

• Four low-skew LVPECL output banks with independent ÷1, ÷2, and ÷4 divider options
• Ultra-low jitter design with <1ps RMS random jitter and <10ps peak-to-peak total jitter
• Patent-pending input termination accepts DC- and AC-coupled CML, PECL, and LVDS signals
• Fail-safe input prevents output oscillation during signal loss

Clock Buffers, Drivers Applications

• SONET/SDH systems
• Fibre Channel applications
• Gigabit Ethernet interfaces

Clock Buffers, Drivers Procurement Notes

Verify the ordering suffix 'TR' corresponds to the tape and reel packaging variant rather than the tray version. Confirm that the component originates from Micrel Technology, now part of Microchip, and ensure the specific lead finish matches project requirements. Validate moisture sensitivity levels and storage conditions prior to assembly.

Clock Buffers, Drivers Selection Notes

Select this component when designing systems requiring precise phase matching across multiple clock domains with varying frequency division needs. Ensure the power supply voltage aligns with either the 2.5V ±5% or 3.3V ±10% operating range. Verify that the thermal management strategy accommodates the package thermal resistance in still-air conditions.

Clock Buffers, Drivers Part Context

This part belongs to the Precision Edge product family, originally developed by Micrel Inc. before its acquisition by Microchip Technology. The SY89221U series integrates clock distribution and division functions into a single 64-pin TQFP package, targeting high-performance networking and telecommunications infrastructure.

Clock Buffers, Drivers Replacement Considerations

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