SY88973VMI-TR

Overview

The SY88973VMI-TR is a low-power limiting post amplifier designed for fiber optic receivers. It operates from a single +3.3V ±10% or +5V ±10% power supply over an industrial temperature range of –40°C to +85°C. The device supports multi-rate operation up to 3.2Gbps with a wide gain-bandwidth product, including 38dB differential gain and 2GHz 3dB bandwidth. It features low noise 50Ω CML data outputs with typically 800mVPP output swing, 60ps edge rates, 5ps RMS random jitter, and 15ps PP deterministic jitter. The component includes a chatter-free Loss-of-Signal (LOS) output with 4.6dB electrical hysteresis and programmable sensitivity via a single external resistor.

Feature Summary

• Multi-rate operation supporting data rates up to 3.2Gbps
• Integrated internal 50Ω data input termination
• Chatter-free Loss-of-Signal (LOS) output with programmable sensitivity
• TTL /EN input allows feedback from LOS for output stability

Applications

• 1.25Gbps and 2.5Gbps Gigabit Ethernet
• 1.062Mbps and 2.125Gbps Fibre Channel
• 155Mbps, 622Mbps, 1.25Gbps, and 2.5Gbps SONET/SDH
• Gigabit interface converter (GBIC)
• Small form factor (SFF) and small form factor pluggable (SFP) transceivers

Procurement Notes

Verify the specific ordering suffix 'MI-TR' against official Microchip documentation to confirm the MLF-16 package type and tape-and-reel packaging configuration. Ensure compatibility with the required industrial temperature range and voltage specifications during procurement validation.

Selection Notes

Select this component when a limiting post amplifier with integrated input termination and programmable loss-of-signal detection is required. It is suitable for interfacing with transimpedance amplifiers in optical networks where signal quantization and noise reduction are critical for downstream CML or AC-coupled PECL inputs.

Part Context

The SY88973V belongs to Micrel's family of 3.3V/5V 3.2Gbps CML low-power limiting post amplifiers. Unlike other devices in the series such as the SY88773V or SY88823V, the SY88973V uniquely combines integrated 50Ω input termination with a TTL active-low Loss-of-Signal output, distinguishing it within the selection guide.

Replacement Considerations

SY88973VKI-TR

FAQ

How is the Loss-of-Signal (LOS) sensitivity configured?

The LOS sensitivity is programmable using a single external resistor connected between the VCC and LOSLVL pins. This resistor sets the threshold for the data input amplitude at which the LOS output will be asserted.

What is the function of the /EN input?

The /EN input is a TTL enable pin that de-asserts the true data output when high. It can be fed back from the LOS output to maintain output stability under a loss-of-signal condition without removing the input signal.