SY89844UMG

Signal Switches, Multiplexers, Decoders Overview

The SY89844UMG is a low jitter LVDS 2:1 input multiplexer optimized for redundant source switchover applications. It features a unique Runt Pulse Eliminator (RPE) to prevent short cycles during switchover and Fail-Safe Input protection against metastable conditions. The device operates from a 2.5V ±5% supply, supports frequencies up to 2.0 GHz, and guarantees propagation delays of less than 870ps. It includes internal termination for inputs as small as 100mV without external resistors.

Signal Switches, Multiplexers, Decoders Feature Summary

• Glitch-free switchover between two clock sources using the Runt Pulse Eliminator circuit
• Fail-Safe Input protection prevents oscillations when selected input amplitude drops below minimum limits
• Unique patent-pending input isolation design minimizes crosstalk between differential inputs
• Accepts DC- and AC-coupled inputs including CML, PECL, and LVDS via VT pin interface

Signal Switches, Multiplexers, Decoders Applications

• Redundant clock switchover systems
• Fail-safe clock protection circuits
• Enterprise server infrastructure
• Test and measurement equipment

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific ordering suffix required for your packaging needs. The standard tube version is SY89844UMG, while the tape and reel variant is designated SY89844UMGTR. Confirm that the industrial temperature range (-40°C to +85°C) meets your environmental requirements before finalizing the order.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when glitch-free transitions between asynchronous clocks are critical. Ensure the frequency difference between the two running clocks does not exceed a 1.5:1 ratio for optimal RPE operation. Verify that the 2.5V power supply tolerance aligns with your system's voltage regulation capabilities.

Signal Switches, Multiplexers, Decoders Part Context

This device belongs to Micrel’s Precision Edge product line, designed for high-speed signal integrity. It serves as an LVDS-specific alternative to the SY89843U (LVPECL) and SY89845U (CML), maintaining identical functional architectures and package dimensions across the family.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Public confirmed substitute part numbers include SY89843UMG and SY89845UMG. These variants share the same package and functionality but support different output logic families.