SY89546UMG

Overview

The SY89546UMG is a high-speed differential multiplexer from the Precision Edge family, manufactured by Microchip Technology. It operates on a single 2.5V supply and supports data rates up to 3.2Gbps. The device features a 4:1 input configuration with a 1:2 fanout, providing two copies of the selected signal. It utilizes internal termination for LVDS, LVPECL, and CML inputs via VT pins. Key electrical parameters include a maximum propagation delay of 530ps, output rise/fall times under 150ps, and ultra-low jitter specifications.

Feature Summary

• Provides dual outputs for the selected differential input channel
• Features unique internal termination accessible through VT pins for flexible interface compatibility
• Designed for ultra-low jitter performance in high-speed applications
• Supports AC-coupled and DC-coupled logic standards without external bias networks

Applications

• SONET/SDH multi-channel select applications
• Fibre Channel applications
• GigE applications

Procurement Notes

Verify that the component matches the specific MLF-32 package variant required for your design. Confirm the operating temperature range aligns with industrial specifications. Ensure power supply decoupling meets the datasheet requirements for stable operation at high frequencies.

Selection Notes

Select this part when a 4:1 multiplexing function with simultaneous dual outputs is required. Consider the SY89547L if a 3.3V supply voltage is necessary instead of 2.5V. Choose alternative models like the SY89544U if only a single differential output is needed rather than the fanout capability provided here.

Part Context

This component belongs to Micrel’s Precision Edge product family, known for high-speed signal integrity. It is designed to replace legacy multiplexers requiring complex external termination networks. The integration of internal termination simplifies PCB layout and reduces component count in high-speed digital systems.

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, leaving the corresponding VT pin open.

What logic standards are supported by the inputs?

The inputs accept LVDS, LVPECL, and CML signals, supporting both AC-coupled and DC-coupled configurations due to the unique internal termination design.