SY58040UMG TR

Signal Switches, Multiplexers, Decoders Overview

The SY58040UMG TR is a low jitter, low skew, high-speed 4x4 crosspoint switch optimized for precision telecom and enterprise server/storage distribution applications. It distributes clock frequencies from DC to 4GHz and data rates to 5Gbps guaranteed over temperature and voltage. The device features ultra-low jitter with 67fs RMS phase jitter (typ) and <350ps propagation delay. It operates from a 2.5V ±5% or 3.3V ±10% power supply within the -40°C to +85°C industrial temperature range. The component is housed in a 44-pin (7mm x 7mm) QFN package.

Signal Switches, Multiplexers, Decoders Feature Summary

• Provides crosspoint switching between any input pair to any output pair with unique patent-pending channel-to-channel isolation design for superior crosstalk performance.
• Features a unique 50Ω input termination architecture that accepts DC- and AC-coupled differential inputs as small as 100mV without level shifting or external termination resistor networks.
• Delivers 400mV CML output swing with 50Ω source terminated outputs to minimize round-trip reflections and ensure extremely fast rise/fall times.

Signal Switches, Multiplexers, Decoders Applications

• Data communication systems
• SONET/SDH data/clock applications
• Fibre Channel applications
• Gigabit Ethernet applications

Signal Switches, Multiplexers, Decoders Procurement Notes

Verify the specific ordering suffix 'TR' indicates tape and reel packaging when sourcing this component. Confirm the manufacturer origin is Micrel, Inc., as Microchip Technology acquired Micrel. Ensure the part number matches the exact alphanumeric sequence to avoid confusion with non-reel variants like the SY58040UMY. Check for Pb-Free green package compliance if required by environmental standards. Validate the 44-pin QFN package dimensions against your PCB footprint requirements before procurement.

Signal Switches, Multiplexers, Decoders Selection Notes

Select this component for applications requiring precise signal routing with minimal jitter and skew across multiple differential pairs. It is suitable for designs needing direct interface to various logic families via its flexible input termination. Consider the 2.5V or 3.3V supply options based on system power constraints. The buffer mode default behavior simplifies configuration if address pins are left floating. Ensure thermal management strategies account for the exposed pad requirement in the QFN package.

Signal Switches, Multiplexers, Decoders Part Context

The SY58040U belongs to Micrel’s Precision Edge product line, which focuses on high-speed, low-jitter timing solutions. This series targets telecom and enterprise infrastructure markets where signal integrity is critical. The device complements other crosspoint switches and clock distributors in the portfolio. Its design emphasizes guaranteed AC performance over wide temperature and voltage ranges, ensuring reliability in demanding industrial environments.

Signal Switches, Multiplexers, Decoders Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing circuit designs if considering alternative components. Consult manufacturer resources for potential obsolescence notices or recommended upgrades within the same product family.

Signal Switches, Multiplexers, Decoders FAQ

How does the SY58040U handle input termination?

The device includes a unique 3-pin input termination architecture that internally terminates each side of the differential input pair to a VT pin through 50Ω resistors, eliminating the need for external termination networks.

What is the default operating mode if control signals are floating?

The SY58040U defaults to buffer mode (IN-to-Q) if the LOAD and CONFIG control signals are left floating, as they are internally connected to pull-up resistors.

Can the inputs accept both AC and DC coupled signals?

Yes, the differential inputs accept both AC- and DC-coupled signals as small as 100mV (200mVpp) without requiring level shifting or additional termination resistor networks in the signal path.