SY88993VKC

Overview

The SY88993VKC is a high-speed limiting post amplifier designed for fiber-optic receiver applications with data rates up to 3.2Gbps. It operates on a single power supply of 3.3V or 5V, drawing a maximum current of 40mA at 5V and 35mA at 3.3V. The device features differential PECL inputs and low-noise CML outputs. It includes a programmable level detect function that generates a chatter-free Loss of Signal (LOS) open collector TTL output. The sensitivity is adjustable via the LOSLVL pin using an external resistor divider.

Feature Summary

• Amplifies small input signals as low as 4mVpp to drive devices with CML inputs
• Incorporates a programmable level detect function to identify signal loss conditions
• Generates a stable, chatter-free Loss of Signal indicator via an open collector TTL output
• Supports disable functionality through a dedicated TTL /EN input

Applications

• 1.25Gbps Gigabit Ethernet
• 531Mbps and 1062Mbps Fibre Channel
• 622Mbps SONET
• Gigabit interface converter
• 2.5Gbps SDH/SONET

Procurement Notes

Verify the specific ordering suffix 'K' indicates the MSOP-10 package type and 'C' denotes the commercial operating temperature range (-40°C to +85°C). Confirm the lead finish is Sn-Pb as specified in the datasheet. Ensure compatibility with existing PCB footprints for the K10-1 package. Check for RoHS compliance requirements against the standard tin-lead finish version.

Selection Notes

Select this component when a limiting amplifier is required for fiber-optic links operating up to 3.2Gbps. It is suitable for quantizing noisy linear signals from transimpedance amplifiers into voltage-limited waveforms. Consider the adjustable LOS threshold if precise signal loss detection is necessary. Verify that the system can accommodate the required 50Ω termination loads for the CML outputs.

Part Context

This part belongs to the SY88993V series of high-speed limiting post amplifiers manufactured by Micrel, now Microchip Technology. It is specifically engineered for high-frequency fiber-optic applications where signal integrity and noise rejection are critical. The device serves as a post-amplifier stage to condition signals before they reach downstream logic or transmission components.

Replacement Considerations

SY88993VKCTR

FAQ

How is the Loss of Signal (LOS) sensitivity adjusted?

The LOS sensitivity is adjusted by connecting a resistor divider between VCC and VREF to the LOSLVL pin.

What is the minimum input signal amplitude the device can amplify?

The device can amplify signals as small as 4mVpp.

Does the device support disabling the output without removing the input signal?

Yes, the /EN pin allows the user to disable the output signal while maintaining the input signal connection.