SY58028UMG-TR

Signal Switches, Multiplexers, Decoders Overview

The SY58028UMG-TR is a high-speed, ultra-precision differential CML multiplexer manufactured by Microchip Technology. It selects one of four differential inputs and provides two copies via an integrated 1:2 fanout buffer. The device supports data rates up to 10.7 Gbps and clock frequencies up to 7 GHz. It operates on a single 2.5V ±5% or 3.3V ±10% power supply within the -40°C to +85°C temperature range. Key electrical specifications include a propagation delay of less than 350ps, rise/fall times under 60ps, and total jitter below 10ps peak-to-peak. The component utilizes a 32-pin MLF package.

Signal Switches, Multiplexers, Decoders Feature Summary

• Accepts AC- or DC-coupled differential signals as low as 100mV without external level shifting or termination networks
• Features unique patented input architecture with VT pins for maximum interface flexibility and minimized crosstalk
• Provides internal 50Ω source termination at the outputs for clean signal transmission
• Delivers ultra-low jitter performance suitable for precision clock and data distribution

Signal Switches, Multiplexers, Decoders Applications

• Redundant clock and/or data distribution systems
• SONET/SDH clock and data distribution networks
• Loopback testing configurations
• Fibre Channel distribution architectures
• Gigabit Ethernet clock and data distribution

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify that the specific ordering suffix matches the required lead finish and packaging format. The 'G' suffix indicates a Pb-Free package with NiPdAu finish, while 'I' denotes Sn-Pb. Confirm whether the 'TR' suffix is present to ensure Tape and Reel delivery rather than tube packaging. Cross-reference the manufacturer part number against official datasheets to validate compatibility with system requirements before procurement.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when interfacing with various differential standards such as CML, LVPECL, or LVDS using a unified architecture. The internal termination reduces board space and component count compared to discrete solutions. Ensure the application requires a 4:1 multiplexing function with simultaneous dual output buffering. Verify that the operating voltage aligns with the 2.5V or 3.3V supply rails available in the design.

Signal Switches, Multiplexers, Decoders Part Context

This device belongs to the Precision Edge product line, designed for high-speed communication applications requiring minimal signal degradation. Originally developed by Micrel, Inc., the technology was acquired by Microchip Technology. The SY58028U serves as a core building block for high-bandwidth routing and switching infrastructure where signal integrity and low latency are critical operational parameters.

Signal Switches, Multiplexers, Decoders Replacement Considerations

SY58029UMG-TR (LVPECL output variant)

Signal Switches, Multiplexers, Decoders FAQ

How does the SY58028UMG-TR handle unused differential input pairs?

Unused input pairs should be terminated properly to prevent indeterminate states. Connect one pin of the pair to ground through a 1kΩ resistor and the complement pin to VCC through an 825Ω resistor.

What is the function of the VT pins on the SY58028UMG-TR?

The VT pins serve as center-taps for the internal 50Ω termination network of each differential input pair, allowing flexible interfacing with AC- or DC-coupled signals.

Can the SY58028UMG-TR accept LVDS signals directly?

Yes, the device accepts LVDS signals. For LVDS interfaces, the VT pins can typically be left open or configured according to specific application guidelines provided in the datasheet.