SY89855UMG

Overview

The SY89855UMG is a precision, high-speed differential multiplexer featuring a 4:1 input selection and an integrated 1:2 fanout buffer. It operates on a 2.5V ±5% or 3.3V ±10% supply within the industrial temperature range of –40°C to +85°C. The device supports clock frequencies up to 2.5GHz and data streams up to 2.5Gbps. It utilizes a unique 3-pin internal termination architecture that accepts AC- or DC-coupled signals as small as 100mV without external level shifting. Outputs provide 800mV LVPECL swing with propagation delays under 410ps and rise/fall times below 180ps.

Feature Summary

• Selects one of four differential inputs and provides two identical copies via an integrated fanout buffer
• Features patent-pending 3-pin input termination for direct interface with CML, LVPECL, and LVDS signals
• Delivers ultra-low-jitter performance with less than 10ps peak-to-peak total jitter
• Guarantees fast output transitions with rise and fall times guaranteed to be less than 180ps

Applications

• Redundant clock and/or data distribution systems
• SONET/OC-3 to OC-48 clock and data distribution networks
• Fibre Channel applications requiring low jitter signal routing
• Loopback testing configurations in communication equipment

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and reel specifications. Confirm that the component meets RoHS compliance requirements for your target assembly process. Ensure the operating voltage aligns with the specified 2.5V or 3.3V ranges. Check moisture sensitivity levels and storage conditions prior to soldering. Validate that the industrial temperature range meets your environmental design constraints.

Selection Notes

Evaluate the requirement for simultaneous dual outputs when choosing between this multiplexer and standard single-output variants. Consider the internal termination capability if minimizing external resistor networks is a priority. Assess whether the 2.5Gbps throughput meets the maximum data rate requirements of the application. Verify compatibility with existing TTL/CMOS select logic levels to simplify control circuitry design.

Part Context

This component belongs to Micrel's Precision Edge product line, designed for high-speed signal integrity. It serves as a specialized solution for managing multiple differential clock sources in dense electronic environments. The device integrates complex signal conditioning functions into a compact QFN-32 package, reducing board space compared to discrete solutions.

Replacement Considerations

The SY58029U is documented as a higher-performance alternative offering similar functionality with enhanced specifications.