MAX3876EHJ

Overview

The MAX3876EHJ is a compact, low-power clock recovery and data retiming integrated circuit designed for 2.488Gbps SDH/SONET applications. It features a fully integrated phase-locked loop (PLL) that recovers a synchronous clock signal from serial NRZ data inputs and retimes the data using this recovered clock. The device provides differential CML outputs for both clock and data signals, along with an additional high-speed input for system loopback diagnostic testing. It includes a TTL-compatible loss-of-lock monitor and operates from a single +3.3V or +5.0V supply over a temperature range of -40°C to +85°C.

Feature Summary

• Fully integrated PLL for clock recovery and data retiming at 2.488Gbps
• Differential CML outputs for clock and data signals
• Additional high-speed input for system loopback diagnostic testing
• TTL-compatible loss-of-lock (LOL) monitor
• Operates on +3.3V or +5.0V single supply

Applications

• SDH/SONET Receivers and Regenerators
• Add/Drop Multiplexers
• Digital Cross-Connects
• 2.488Gbps ATM Receiver
• Digital Video Transmission

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm package integrity and pin alignment upon receipt. Ensure storage conditions adhere to moisture sensitivity levels specified in the datasheet. Check for any specific handling requirements related to electrostatic discharge protection during assembly.

Selection Notes

Select the MAX3876EHJ for applications requiring low-power clock recovery at 2.488Gbps. Ensure the design supports differential CML signaling and provides appropriate termination resistors. Verify that the power supply voltage matches the +3.3V or +5.0V requirement. Consider the need for an external loop filter capacitor to set the PLL damping ratio according to jitter performance specifications.

Part Context

The MAX3876EHJ belongs to the MAX3876 series of clock recovery and data retiming ICs. It is part of Maxim Integrated's portfolio of high-speed communication components. The 'EHJ' suffix indicates the specific temperature range (-40°C to +85°C) and the 32-pin TQFP package variant. This component is designed for use in optical transmission systems operating at OC-48/STM-16 rates.

Replacement Considerations

Direct replacements may include other MAXIM Integrated clock recovery ICs such as the MAX3875 or MAX3877, depending on specific feature requirements like vertical threshold adjust or different packaging options. Verify compatibility with existing circuit designs, particularly regarding pinout and electrical characteristics.