SY58621LMG-TR

Overview

The SY58621LMG-TR is a high-speed transceiver from Micrel's Precision Edge line, designed for backplane and transmission line data management. It operates on a single +3.3V ±10% supply within the industrial temperature range of –40°C to +85°C. The device supports a maximum throughput of 3.2Gbps with deterministic jitter under 13ps peak-to-peak and random jitter below 0.75ps RMS. It features a variable swing LVPECL transmitter output (80mV to 800mV) and a CML receiver output (400mV differential). The component is housed in a 24-pin QFN package.

Feature Summary

• Patented three-pin input termination architecture enabling direct interface to AC- or DC-coupled differential signals without external termination networks.
• Integrated selectable loopback diagnostic mode that routes the transmitter input directly to the receiver output for system testing.
• TTL-compatible Loss-of-Signal (LOS) output with programmable sensitivity threshold via an external resistor.

Applications

• Backplane management
• Active cable transceivers
• SONET/SDH data/clock applications
• 4X Fibre Channel applications

Procurement Notes

Verify the specific ordering suffix 'TR' corresponds to the tape and reel packaging format required for automated assembly processes. Confirm that the lead finish is NiPdAu and the package marking includes the Pb-Free bar-line indicator as specified in the manufacturer's ordering information. Ensure compatibility with standard surface mount technology reflow profiles.

Selection Notes

Select this component when a combined low-jitter transceiver with integrated loopback functionality is required for enterprise server or telecom environments. Consider the SY58620L if both the receiver and transmitter require CML outputs rather than the LVPECL transmitter provided here. Evaluate the variable swing capability against the impedance requirements of the target transmission lines.

Part Context

This part belongs to the Precision Edge product line developed by Micrel, Inc., which focuses on high-speed signal integrity solutions. The SY58621L serves as a bridge between different signaling standards, converting between LVPECL and CML domains while maintaining signal quality over long backplane traces.

Replacement Considerations

SY58620L

FAQ

How does the patented input termination work?

The transmitter utilizes a unique three-pin architecture that provides internal termination to the TXVT pin, allowing it to accept AC- or DC-coupled differential signals as small as 100mV without requiring external resistors in the signal path.

What is the function of the LOSLVL pin?

The LOSLVL pin allows users to program the threshold for the Loss-of-Signal detection. Connecting a resistor between VCC and LOSLVL sets the voltage divider that determines the input amplitude at which the LOS output asserts HIGH.