SY89838UMG-TR

Clock Buffers, Drivers Overview

The SY89838UMG-TR is a Precision Edge low jitter, low skew, high-speed 1:8 fanout buffer with a unique 2:1 differential input multiplexer optimized for redundant source switchover applications. It distributes clock frequencies from 1kHz to 1.5GHz (guaranteed up to 2.0GHz). The device features a Runt Pulse Eliminator (RPE) MUX that prevents short cycles during switchover and a fail-safe input protection mechanism. It accepts AC- or DC-coupled differential inputs as small as 200mV without external level shifting or termination networks. Outputs are 350mV compatible LVDS with rise/fall times under 150ps. Operating voltage is 2.5V ±5%, and it functions within the -40°C to +85°C industrial temperature range in a 32-pin QFN package.

Clock Buffers, Drivers Feature Summary

• 2:1 Differential Input Multiplexer with Runt Pulse Eliminator (RPE) for glitch-free switchover
• Fail-Safe Input (FSI) protection against metastable conditions when input amplitude drops below 200mV
• Unique 3-pin input termination architecture accepting CML, PECL, and LVDS signals directly
• Ultra-low jitter design with 150fs RMS phase jitter and <0.7ps RMS MUX crosstalk-induced jitter

Clock Buffers, Drivers Applications

• Redundant clock switchover systems
• Failsafe clock protection circuits
• Enterprise Servers
• LAN/WAN infrastructure
• Test and Measurements equipment

Clock Buffers, Drivers Procurement Notes

Verify the component originates from Microchip Technology, which acquired Micrel. Confirm the specific ordering suffix 'TR' indicates Tape and Reel packaging, distinct from the standard tube variant. Ensure the datasheet version matches the device specifications, particularly regarding the operating frequency limits and supply voltage requirements of 2.375V to 2.625V.

Clock Buffers, Drivers Selection Notes

Select this component when redundant clock sources require seamless switching without runt pulses. It is suitable for interfacing with various differential standards (CML, PECL, LVDS) due to its internal termination. Ensure the application operates within the 2.5V ±5% supply range and requires LVDS outputs. For LVPECL output requirements, consider the SY89837U instead.

Clock Buffers, Drivers Part Context

The SY89838U belongs to Micrel’s Precision Edge product line, now part of Microchip Technology. It is designed for high-speed clock distribution where signal integrity and redundancy are critical. The device integrates both buffering and multiplexing functions into a single 32-pin QFN package, reducing board space compared to discrete solutions.

Clock Buffers, Drivers Replacement Considerations

For LVPECL output variants, the SY89837U serves as a direct functional replacement with identical input/multiplexer characteristics but different output swing. Standard 1:8 fanout buffers without multiplexing capabilities do not offer the same redundancy features.