SY89851UMG-TR

Clock Buffers, Drivers Overview

The SY89851UMG-TR is a low-power, high-speed 1:2 differential fanout buffer and translator from the Precision Edge series. It supports clock frequencies up to 4 GHz and data rates up to 2.5 Gbps. The device features an internal 3-pin termination architecture that accepts AC- or DC-coupled inputs as small as 100mV without external level shifting. Outputs are 800mV LVPECL-compatible with propagation delay under 340ps and output-to-output skew less than 20ps. It operates on a 2.5V ±5% or 3.3V ±10% supply within the -40°C to +85°C industrial temperature range.

Clock Buffers, Drivers Feature Summary

• Precision 1:2 LVPECL fanout buffer with ultra-low jitter (<1ps RMS random, <10ps PP total).
• Unique patented input termination accepts CML, LVDS, and LVPECL signals directly.
• Guaranteed AC performance over temperature and voltage for telecom and enterprise applications.
• Low power consumption of 80mW typical at 2.5V.

Clock Buffers, Drivers Applications

• SONET and GigE clock distribution
• Fibre Channel applications
• Backplane distribution
• High-end multiprocessor synchronous clock distribution

Clock Buffers, Drivers Procurement Notes

Verify the ordering suffix 'TR' corresponds to the tape and reel packaging format specified in the datasheet. Confirm the package marking '851U' matches the QFN-16 component identification. Ensure the procurement source provides documentation confirming compliance with the Pb-Free and NiPdAu lead finish requirements listed for this part number.

Clock Buffers, Drivers Selection Notes

Select this component when a 1:2 differential fanout buffer with integrated input termination is required. It is suitable for distributing clocks from DC to >3GHz. Verify compatibility with the system's power supply (2.5V or 3.3V) and ensure the PCB layout accommodates the 16-pin QFN package with an exposed ground pad for thermal management.

Clock Buffers, Drivers Part Context

This component belongs to Micrel's Precision Edge product line, which focuses on high-speed, low-jitter timing solutions. The SY89851U serves as a specialized buffer/translator designed to interface various differential signaling standards into a clean LVPECL output for downstream logic or clock distribution networks.

Clock Buffers, Drivers Replacement Considerations

The SY58012U is a related product offering similar functionality but with a higher maximum operating frequency of 5GHz. When evaluating replacements, verify that the alternative device maintains the same 1:2 ratio, LVPECL output compatibility, and package dimensions to ensure mechanical fit.