SY89112UMY

Clock Buffers, Drivers Overview

The SY89112UMY is a low-jitter, low-skew LVPECL 1:12 differential fanout buffer featuring a 2:1 input multiplexer and internal termination. It distributes clock frequencies from DC to over 2GHz with a maximum propagation delay of 550ps and output-to-output skew under 25ps. The device operates on a 2.5V or 3.3V supply within an industrial temperature range of -40°C to +85°C. It utilizes a unique patent-pending 3-pin input termination architecture for direct interface with AC- or DC-coupled signals as small as 100mV without external level shifting.

Clock Buffers, Drivers Feature Summary

• 1:12 LVPECL fanout buffer with integrated 2:1 input MUX for clock switchover
• Ultra-low jitter design with typical 50fs RMS phase jitter and less than 0.7ps RMS crosstalk-induced jitter
• Patent-pending 3-pin input termination accepts differential inputs down to 100mV without external resistors
• Synchronous output enable (EN) prevents generation of runt clock pulses

Clock Buffers, Drivers Applications

• Multi-processor server clock distribution
• SONET/SDH clock and data distribution
• Fibre Channel distribution networks
• Gigabit Ethernet clock distribution

Clock Buffers, Drivers Procurement Notes

Verify the ordering suffix 'MY' indicates the Pb-Free Matte-Sn lead finish variant in the QFN-44 package. Confirm that the component meets RoHS compliance requirements for the specific manufacturing batch. Ensure the procurement source provides valid traceability documentation for the industrial temperature grade (-40°C to +85°C).

Clock Buffers, Drivers Selection Notes

Select this component when a high-speed LVPECL fanout buffer requires redundant clock input selection via an integrated 2:1 MUX. It is suitable for designs needing minimal channel-to-channel crosstalk and direct interfacing with AC- or DC-coupled sources without external termination networks. Verify that the system power supply aligns with the 2.5V ±5% or 3.3V ±10% operating ratings.

Clock Buffers, Drivers Part Context

The SY89112U belongs to Micrel’s Precision Edge product line, designed for high-speed timing applications. The 'MY' suffix specifically denotes the Pb-free version packaged in a 44-pin QFN format. This part serves as a precision clock driver optimized for enterprise server and telecom infrastructure where signal integrity and low skew are critical.

Clock Buffers, Drivers Replacement Considerations

The SY89113U is a related product offering similar functionality but utilizing LVDS outputs instead of LVPECL. Designers must evaluate voltage compatibility and impedance matching differences when considering alternative logic families.