SY89545LMG

Overview

The SY89545LMG is a Precision Edge® differential 4:1 multiplexer with an LVDS-compatible output. It operates from a single 3.3V supply and supports data rates up to 3.2Gbps. The device features internal input termination accessible via VT pins, allowing compatibility with AC- or DC-coupled LVDS, LVPECL, and CML inputs. It provides ultra-low jitter performance, including less than 1ps RMS random jitter and less than 10ps peak-to-peak deterministic jitter. The component is housed in a 32-pin MLF package and functions within the industrial temperature range of -40°C to +85°C.

Feature Summary

• Selects among four differential inputs for high-speed signal routing
• Features unique internal input termination network accessible through dedicated VT pins
• Accepts both AC-coupled and DC-coupled logic standards without external biasing networks
• Delivers low-jitter LVDS output signals suitable for demanding clock applications

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 'MG' suffix indicates a Pb-Free part with NiPdAu finish in tube packaging. Confirm the voltage supply requirements align with the 3.3V specification before procurement. Ensure the selected variant meets the necessary thermal management guidelines for the exposed pad connection.

Selection Notes

Consider the SY89544U if a 2.5V power supply is required instead of 3.3V. Select the SY89546U or SY89547L if the design requires two differential outputs rather than a single output. Verify that the interface standards used in the system are compatible with the device's ability to accept LVDS, LVPECL, or CML inputs through its internal termination architecture.

Part Context

This component belongs to Micrel’s Precision Edge® product family, which specializes in fast, low-jitter differential multiplexers. The SY89545L serves as a core building block for high-speed serial communication systems requiring precise signal selection. Its design focuses on minimizing crosstalk and maintaining signal integrity across various industry-standard logic interfaces.

Replacement Considerations

SY89547LMG

FAQ

How does the device handle unused differential input pairs?

Unused differential input pairs should be terminated by connecting one input to VCC and the complementary input to GND through a 1kΩ resistor. The corresponding VT pin must be left open in this configuration.

What logic standards can the inputs accept?

The unique input termination and VT pin allow the device to accept DC-coupled and AC-coupled inputs, specifically supporting LVDS, LVPECL, and CML logic standards.