SY89831UMG

Clock Buffers, Drivers Overview

The SY89831UMG is a high-speed, ultra-precision 1:4 LVPECL fanout buffer and translator from the Precision Edge family. It supports throughput frequencies up to 2.5GHz with a typical propagation delay of 350ps and within-device skew under 20ps. The device features unique internal termination accessible via a VT pin, accepting differential inputs as small as 100mV for both AC and DC coupling. It operates on a 2.5V ±5% or 3.3V ±10% supply, delivering an 800mV LVPECL output swing in a 16-pin MLF package.

Clock Buffers, Drivers Feature Summary

• Ultra-low jitter design with 62fs RMS phase jitter (typical) and 5ps within-device skew (typical).
• Unique patent-pending input termination architecture allows interface to DC- and AC-coupled differential signals without external level shifting.
• Includes VREF-AC reference output for biasing AC-coupled applications.
• Synchronous enable function ensures outputs transition only during logic low states.

Clock Buffers, Drivers Applications

• Processor clock distribution networks.
• SONET clock distribution systems.
• Fibre Channel clock distribution.
• Gigabit Ethernet clock distribution.

Clock Buffers, Drivers Procurement Notes

Verify the ordering suffix 'MG' corresponds to the MLF-16 package type and industrial temperature range (-40°C to +85°C). Confirm that the Pb-Free NiPdAu lead finish meets specific environmental requirements. Ensure the source documentation explicitly identifies the manufacturer as Micrel or Microchip Technology to validate component authenticity.

Clock Buffers, Drivers Selection Notes

Select this component when interfacing differential sources requiring translation to LVPECL with minimal skew. The internal termination simplifies designs by eliminating external resistors for inputs down to 100mV. Verify compatibility with 2.5V or 3.3V power rails, as the device accepts both ranges. Consider the 16-pin MLF package constraints for PCB layout and thermal management.

Clock Buffers, Drivers Part Context

The SY89831U belongs to Micrel's high-speed clock synchronization family, specifically designed for ultra-low skew fanout buffering. It complements related parts like the SY89830U (with MUX input) and SY89832U (LVDS output), providing a specialized solution for translating and distributing high-frequency differential clocks across multiple loads.

Clock Buffers, Drivers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Consult the manufacturer's website for alternative I/O combinations within the Precision Edge family if functional requirements differ.

Clock Buffers, Drivers FAQ

How does the device handle AC-coupled inputs?

For AC-coupled applications, connect the VREF-AC pin to the VT pin and bypass it with a 0.01µF low-ESR capacitor to VCC. This provides the necessary bias voltage for the internal termination network.

What is the maximum frequency supported by the SY89831UMG?

The device supports a typical throughput frequency of 2.5GHz, with a guaranteed maximum frequency of 2.0GHz when maintaining an output voltage swing of at least 450mV.

Can unused outputs be left open?

Yes, unused differential output pairs may be left open. However, active outputs must be terminated with 50Ω to VCC – 2V to ensure proper signal integrity.