SY89831UMI

Clock Buffers, Drivers Overview

The SY89831UMI is a high-speed, ultra-precision 1:4 LVPECL fanout buffer and translator from Micrel's Precision Edge family. It supports throughput frequencies up to 2.5 GHz with a typical propagation delay of 350 ps and within-device skew under 20 ps. The device operates on a 2.5V ±5% or 3.3V ±10% supply and features internal termination accessible via a VT pin for flexible AC/DC coupling. RMS phase jitter is typically 62 fs at 622 MHz. It is housed in a 16-pin MLF package.

Clock Buffers, Drivers Feature Summary

• Ultra-low skew design with guaranteed within-device skew less than 20 ps (typical 5 ps).
• Unique patent-pending input termination architecture allowing access through a VT pin for DC- and AC-coupled inputs.
• Includes VREF-AC reference output for biasing AC-coupled applications.
• Synchronous single-ended TTL/CMOS-compatible enable input (EN) with internal pull-up resistor.

Clock Buffers, Drivers Applications

• Processor clock distribution
• SONET clock distribution
• Fibre Channel clock distribution
• Gigabit Ethernet clock distribution

Clock Buffers, Drivers Procurement Notes

Verify the specific suffix 'UMI' against official documentation, as standard listings often use 'UMG'. Confirm RoHS compliance status and moisture sensitivity level (MSL 2) requirements during procurement. Ensure the ordering suffix matches the required tape and reel or tray packaging format specified by the manufacturer.

Clock Buffers, Drivers Selection Notes

Select this component for applications requiring low-skew LVPECL distribution with flexible input interface options. The internal termination simplifies designs for both AC and DC coupled signals. Consider the SY89830U if an integrated 2:1 MUX input is needed instead of a simple buffer.

Clock Buffers, Drivers Part Context

The SY89831U belongs to Micrel's high-speed clock synchronization family, now part of Microchip Technology following acquisition. It is designed for precision telecom and enterprise server distribution where signal integrity and timing accuracy are critical.

Clock Buffers, Drivers Replacement Considerations

The SY89830U is a related product offering similar performance but includes a 2:1 MUX input. Verify pin compatibility and electrical specifications before substituting with other devices in the Precision Edge series.

Clock Buffers, Drivers FAQ

How does the device handle AC-coupled inputs?

The SY89831UMI includes a VREF-AC reference output that biases to VCC – 1.4V. For AC-coupled applications, connect VREF-AC to the VT pin and bypass it with a 0.01µF low-ESR capacitor to VCC.

What is the maximum operating frequency?

The device guarantees operation up to 2.5 GHz when the output voltage swing is maintained at or above 450 mV.

Can unused outputs be left open?

Yes, unused differential output pairs may be left open without affecting the operation of the active outputs.