SY58021UMG-TR

Clock Buffers, Drivers Overview

The SY58021UMG-TR is a high-speed, fully differential 1:4 LVPECL fanout buffer manufactured by Microchip Technology. It processes clock signals up to 4 GHz with less than 15 ps channel-to-channel skew and 70 fs RMS phase jitter. The device accepts differential inputs as low as 100 mV via a unique 3-pin termination architecture supporting LVPECL, CML, and LVDS signals. It operates from a 2.5 V ±5% or 3.3 V ±10% supply within the industrial temperature range of –40°C to +85°C. Packaged in a 16-pin QFN (3 mm × 3 mm) with an exposed pad, it provides four identical buffered outputs.

Clock Buffers, Drivers Feature Summary

• Precision 1:4 LVPECL fanout buffer with internal input termination
• Low jitter performance: 70 fs RMS phase jitter (typical)
• Accepts input signal as low as 100 mV; supports DC/AC-coupled LVPECL, CML, and LVDS
• 100k LVPECL-compatible 800 mV swing output

Clock Buffers, Drivers Applications

• SONET and GigE clock distribution
• Fibre Channel clock and data distribution
• Backplane distribution
• High-end, low-skew, multiprocessor synchronous clock distribution

Clock Buffers, Drivers Procurement Notes

Verify that the ordering suffix 'TR' corresponds to the Tape and Reel packaging configuration. Confirm the package marking for lead-free variants includes the Pb-Free bar-line indicator. Ensure compatibility with the specified 16-pin QFN footprint during procurement planning.

Clock Buffers, Drivers Selection Notes

Select this component when a 1:4 fanout buffer with LVPECL outputs is required. Consider the SY58022U if a 400 mV LVPECL output swing is needed, or the SY58020U if CML outputs are preferred. Verify that the 4 GHz maximum operating frequency meets system requirements.

Clock Buffers, Drivers Part Context

The SY58021U belongs to Micrel’s Precision Edge product line, now distributed by Microchip Technology. It is part of a family including the SY58020U (CML output) and SY58022U (400mV LVPECL output). The device is designed for high-speed clock distribution applications requiring low skew and jitter.

Clock Buffers, Drivers Replacement Considerations

Public confirmed substitute part numbers: SY58022UMG-TR (400mV LVPECL output), SY58020UMG-TR (CML output). Verify pinout and electrical specifications before substitution.

Clock Buffers, Drivers FAQ

What input signal types does the SY58021UMG-TR support?

It supports differential LVPECL, CML, and LVDS signals, which can be AC- or DC-coupled.

How is the VT pin used in the SY58021UMG-TR?

The VT pin serves as the center-tap for the internal 50Ω input termination network. For AC-coupled inputs, it should be connected directly to the VREF-AC pin.

What is the maximum operating frequency of the SY58021UMG-TR?

The maximum operating frequency is 4 GHz for clock signals and 5 Gbps for NRZ data.