SY89540UMI

Signal Switches, Multiplexers, Decoders Overview

The SY89540UMI is a low-jitter, high-speed 4x4 LVDS crosspoint switch from the Precision Edge series. It guarantees data rates up to 3.2Gbps with propagation delays under 480ps and rise/fall times below 120ps. The device operates on a 2.5V ±5% supply within an industrial temperature range of –40°C to +85°C. It features internal 50Ω input termination and accepts AC- or DC-coupled differential inputs as small as 100mV. Packaged in a 44-pin MLF® (7mm x 7mm) format.

Signal Switches, Multiplexers, Decoders Feature Summary

• Patent-pending channel-to-channel isolation design for superior crosstalk performance
• Unique 3-pin input termination architecture accepting AC/DC coupled signals without external resistors
• Ultra-low jitter design ensuring <1ps RMS random jitter and <10ps PP deterministic jitter
• Configurable buffer mode allowing 1:4 fanout distribution

Signal Switches, Multiplexers, Decoders Applications

• SONET/SDH channel select applications
• Fibre Channel multi-channel select applications
• Gigabit Ethernet multi-channel select applications
• Enterprise server/storage distribution systems

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the ordering suffix 'MI' indicates a Sn-Pb lead finish and standard MLF-44 packaging. Confirm that the component meets Pb-Free requirements if necessary, as this specific suffix differs from the 'MY' variant which is explicitly marked as Pb-Free Matte-Sn. Ensure the application environment supports the specified industrial temperature range and voltage tolerances.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when precise signal routing between multiple differential sources is required. It is suitable for designs needing low skew and minimal jitter across high-speed serial links. The internal termination simplifies board layout by removing external resistor networks. Verify compatibility with LVDS, LVPECL, or CML signaling standards based on coupling requirements.

Signal Switches, Multiplexers, Decoders Part Context

This part belongs to Micrel's Precision Edge product line, optimized for telecom and enterprise infrastructure. It functions as a configurable crosspoint switch or fanout buffer. The device utilizes TTL/CMOS-compatible control pins for addressing inputs and outputs, providing flexible I/O mapping capabilities within a compact surface-mount package.

Signal Switches, Multiplexers, Decoders Replacement Considerations

SY89540UMITR

Signal Switches, Multiplexers, Decoders FAQ

How does the device handle input termination?

It features a unique 3-pin input termination architecture where each side of the differential pair internally terminates to a VT pin through 50Ω.

What is the default operational mode upon power-up?

The device defaults to buffer mode (IN to Q), buffering the selected input signal to all four outputs when LOAD and CONFIG are HIGH.