SY89855UMG-TR

Overview

The SY89855UMG-TR is a precision, high-speed differential LVPECL 4:1 multiplexer with an integrated 1:2 fanout buffer. It operates on a 2.5V ±5% or 3.3V ±10% supply and supports data rates up to 2.5Gbps and clock frequencies up to 2.5GHz. The device features internal termination for AC- or DC-coupled inputs as small as 100mV. Key electrical parameters include a propagation delay of less than 410ps (IN-to-Q), output rise/fall times under 180ps, and total jitter below 10ps peak-to-peak. Power consumption is 260mW at 2.5V.

Feature Summary

• Selects one of four differential inputs and provides two identical copies via the integrated fanout buffer
• Features unique patent-pending input architecture that accepts signals down to 100mV without external level shifting or termination networks
• Delivers low-jitter performance with ultra-low deterministic and random jitter specifications
• Generates 800mV LVPECL outputs with fast rise and fall times guaranteed to be under 180ps

Applications

• Redundant clock and/or data distribution systems
• SONET/OC-3 to OC-48 clock and data distribution networks
• Loopback configurations in communication equipment
• Fibre Channel applications requiring precise signal routing
• Gigabit Ethernet (GigE) interface implementations

Procurement Notes

Verify the component origin, as the datasheet identifies Micrel, Inc. as the manufacturer while the model prefix indicates Microchip Technology acquisition. Confirm the package marking includes the Pb-Free bar-line indicator and NiPdAu lead finish. Ensure the ordering suffix matches the tape and reel requirement if bulk procurement is intended. Validate that the industrial temperature range (-40°C to +85°C) meets your specific environmental constraints before finalizing orders.

Selection Notes

Choose this component when a low-power, high-speed solution is required for routing multiple differential clock sources. The internal termination simplifies design by eliminating external resistor networks for AC- or DC-coupled inputs. Consider the SY58029U if higher performance metrics are necessary. Verify that the 32-pin QFN package fits within your board layout constraints and that thermal management provisions for the exposed pad are implemented correctly.

Part Context

This part belongs to the Precision Edge product line, originally developed by Micrel, Inc., which focuses on high-speed, low-power semiconductor solutions. The SY89855U integrates a 4:1 MUX with a 1:2 fanout, distinguishing it from standard multiplexers. It utilizes a 32-pin QFN package designed for surface mount technology. The device is optimized for noise reduction and signal integrity in demanding telecommunications and networking environments.

Replacement Considerations

The SY58029U is documented as a related product offering higher performance levels. Both devices share similar functional architectures but may differ in specific electrical characteristics. Verify pin compatibility and power requirements when substituting. No other direct substitute part numbers are confirmed in the provided documentation.