SY89545LMI

Overview

The SY89545LMI is a high-speed differential 4:1 multiplexer manufactured by Microchip Technology, operating on a single 3.3V supply within the industrial temperature range of –40°C to +85°C. It supports data rate throughput up to 3.2Gbps with guaranteed AC performance over temperature and voltage variations. The device features an ultra-low jitter design, including less than 1ps RMS random jitter and less than 10ps peak-to-peak deterministic jitter. It utilizes a unique internal input termination accessible via VT pins, allowing compatibility with LVDS, LVPECL, and CML logic standards through both DC-coupled and AC-coupled interfaces without external resistor networks.

Feature Summary

• Features an ultra-low jitter architecture designed for high-speed signal integrity applications
• Incorporates unique internal input termination accessible through dedicated VT pins for flexible interface configurations
• Supports multiple differential logic standards including LVDS, LVPECL, and CML via DC or AC coupling
• Provides CMOS/TTL compatible MUX select inputs for straightforward control integration

Applications

• SONET/SDH channel select applications
• Fiber Channel multi-channel select applications
• Gigabit Ethernet multi-channel select

Procurement Notes

Verify that the specific ordering suffix matches the required lead finish and packaging format. The 'MI' suffix indicates an MLF-32 package with Sn-Pb lead finish intended for industrial temperature ranges. Confirm whether tape and reel availability is necessary for automated assembly processes versus tube packaging. Ensure compliance with RoHS directives if lead-free NiPdAu finishes are mandated for the target manufacturing environment.

Selection Notes

Select this component when a single-ended TTL/CMOS controlled 4:1 differential multiplexer is required for Gigabit speeds. Consider alternative models like the SY89544U if a 2.5V supply operation is preferred over the standard 3.3V configuration. Evaluate the SY89546U or SY89547L if the application demands two differential outputs rather than a single output pair. Verify that the internal termination flexibility aligns with the source driver's coupling requirements.

Part Context

This device belongs to Micrel’s Precision Edge product family, which focuses on fast, low-jitter differential signaling solutions. The SY89545L serves as a core multiplexing element within this series, designed to minimize crosstalk through unique input isolation designs. It complements other devices in the lineup such as the SY89542U and SY89543U, providing specialized routing capabilities for high-frequency communication protocols.

Replacement Considerations

Public confirmed substitute part numbers include SY89545LMITR (Tape and Reel variant) and SY89545LMG (Pb-Free variant). For 2.5V supply applications, consider the SY89544U. If dual differential outputs are required, evaluate the SY89546U or SY89547L.