SY58029UMG-TR

Signal Switches, Multiplexers, Decoders Overview

The SY58029UMG-TR is a Precision Edge ultra-precision differential LVPECL 4:1 multiplexer with 1:2 fanout and internal termination. It selects one of four differential inputs and provides two copies of the selected input. The device handles clocks up to 4GHz and data streams up to 5Gbps. It accepts input signals as low as 100mV without level shifting or external termination networks. Outputs are 800mV LVPECL (100k compatible) with rise/fall times under 110ps. It operates from a 2.5V ±5% or 3.3V ±10% supply over an industrial temperature range of –40°C to +85°C.

Signal Switches, Multiplexers, Decoders Feature Summary

• Unique patented 3-pin input termination architecture allows direct interfacing to AC- or DC-coupled differential signals as small as 100mV without external resistors.
• Ultra-low-jitter design ensures clean, stub-free signal paths for high-speed clock and data distribution applications.
• Integrated 1:2 fanout buffer provides two identical copies of the selected multiplexed input simultaneously.

Signal Switches, Multiplexers, Decoders Applications

• Redundant clock and/or distribution
• All SONET/SDH clock/data distribution
• Loopback
• All Fibre Channel distribution
• All Gigabit Ethernet clock and/or data distribution

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify that the ordering suffix 'TR' corresponds to the tape and reel packaging variant rather than the tube configuration. Confirm the lead finish is NiPdAu for Pb-Free compliance. Ensure the component matches the MLF-32 package dimensions and thermal pad requirements specified in the datasheet for proper PCB soldering and heat dissipation.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component when a 4:1 multiplexer with simultaneous dual outputs is required for high-speed differential signaling. It is suitable for systems needing to interface directly with CML, LVPECL, or LVDS sources without additional termination circuitry. Consider alternatives like the SY58028U if CML outputs are needed, or the SY58030U if 400mV LVPECL swings are preferred.

Signal Switches, Multiplexers, Decoders Part Context

The SY58029U belongs to Micrel’s Precision Edge product line, designed for high-speed, low-jitter applications. It is part of a family that includes variants with different output types, such as the SY58028U (CML) and SY58030U (400mV LVPECL). The device utilizes a 32-pin MicroLeadFrame package optimized for thermal performance and compact board space.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Public confirmed substitute part numbers include SY58028U for CML output requirements and SY58030U for 400mV LVPECL swing applications. Verify pin compatibility and electrical specifications before substitution.

Signal Switches, Multiplexers, Decoders FAQ

How does the SY58029U handle unused differential inputs?

Unused differential input pairs should have one end connected to ground through a 1kΩ resistor and the other end left floating. Unused VT and VREF-AC pins may also be left floating.

What is the function of the VT pin on the SY58029U?

The VT pin serves as a center-tap for the internal 50Ω termination network of each differential input pair, providing maximum interface flexibility for various signal standards.

Can the SY58029U accept both AC-coupled and DC-coupled inputs?

Yes, the unique patented input termination architecture allows the device to accept both AC-coupled and DC-coupled differential signals without requiring external level shifting or termination resistor networks.