SY89464UMY

Clock Buffers, Drivers Overview

The SY89464UMY is a low jitter LVPECL fanout buffer featuring a 2:1 differential input multiplexer with Runt Pulse Eliminator (RPE) and Fail-Safe Input (FSI). It provides ten precision LVPECL outputs from two differential inputs. The device operates on a 2.5V ±5% or 3.3V ±10% supply, supporting frequencies up to 2.0 GHz. Key electrical parameters include propagation delays under 1100ps, rise/fall times below 220ps, and jitter specifications of less than 1ps RMS random and cycle-to-cycle jitter. It functions within an industrial temperature range of -40°C to +85°C.

Clock Buffers, Drivers Feature Summary

• Integrates a 2:1 MUX with Runt Pulse Eliminator for glitchless switchover between clock sources.
• Includes Fail-Safe Input protection to prevent metastable output conditions during signal failure.
• Features unique internal termination architecture accepting AC- or DC-coupled signals as small as 100mV.
• Delivers ultra-low jitter performance with less than 1ps RMS random and cycle-to-cycle jitter.

Clock Buffers, Drivers Applications

• Redundant clock switchover systems
• Fail-safe clock protection circuits
• Enterprise server distribution networks

Clock Buffers, Drivers Procurement Notes

Verify the package marking matches the part number exactly. Confirm the lead finish is Matte-Sn Pb-Free. Ensure the operating range corresponds to the Industrial specification (-40°C to +85°C). Check that the ordering suffix indicates the correct tape and reel quantity if applicable.

Clock Buffers, Drivers Selection Notes

Select this component when redundant clock switching without runt pulses is required. Ensure the input signal amplitude meets the minimum 100mV single-ended requirement. Verify compatibility with 2.5V or 3.3V power supplies. Consider the 44-pin QFN package constraints for thermal management and PCB layout.

Clock Buffers, Drivers Part Context

This device belongs to Micrel’s Precision Edge product line, designed for high-speed applications. It is manufactured by Micrel, Inc., which was acquired by Microchip Technology. The part is optimized for telecom and enterprise server environments requiring precise clock distribution.

Clock Buffers, Drivers Replacement Considerations

SY89465UMY: Similar function but uses LVDS outputs instead of LVPECL.

Clock Buffers, Drivers FAQ

How does the Runt Pulse Eliminator function?

The RPE circuit ensures glitchless switchover between two clocks by preventing short cycles or runt pulses during the transition, utilizing a three-stage process for seamless switching.

What is the purpose of the CAP pin?

The CAP pin controls the Power-On Reset delay. Connecting it to VCC disables the RPE function, while connecting a capacitor allows the internal RPE logic to start up in a known state.

Can the device accept AC-coupled inputs?

Yes, the unique internal termination architecture allows the device to interface with both AC- and DC-coupled differential signals without external level shifting or termination networks.