82V2081PP

Overview

The IDT82V2081 is a single-channel T1/E1/J1 line interface unit designed for long haul and short haul applications. It operates on a single 3.3 V power supply with 5 V tolerance on digital interfaces. The device integrates an adaptive equalizer, clock/data recovery, AMI/B8ZS/HDB3 encoding/decoding, and jitter attenuation. It supports selectable line terminating impedances of 75 Ω, 100 Ω, 110 Ω, and 120 Ω. Available in 44-pin TQFP and 48-pin QFN packages.

Feature Summary

• Supports Hitless Protection Switching (HPS) for 1+1 protection without external relays
• Integrates PRBS/QRSS generation and detection circuits for network maintenance
• Provides software programmable or hardware selectable configuration for system interfaces and line coding
• Includes driver short-circuit protection and internal protection diodes

Applications

• LAN and WAN equipment
• Wireless base stations
• CSU/DSU equipment
• Frame relay access devices

Procurement Notes

Verify the specific package variant required, as the component is available in both 44-pin TQFP and 48-pin QFN configurations. Confirm that the ordering suffix matches the desired temperature rating and packaging format according to manufacturer documentation. Ensure compatibility with the intended control interface mode before procurement.

Selection Notes

Select this component when a single channel T1, E1, or J1 interface is required with integrated signal conditioning. Consider the pin-compatible alternatives, such as the 82V2041E or 82V2051E, if only short haul functionality is needed. Verify that the system design accommodates the 3.3 V supply voltage and 5 V tolerant I/O requirements.

Part Context

This component belongs to the IDT 82V20xx series of telecom line management ICs. It serves as a versatile line interface unit capable of handling multiple standard protocols within a single bill of materials. The device is part of a broader family that includes octal channel variants like the 82V2088.

Replacement Considerations

The 82V2041E and 82V2051E are documented as pin-compatible alternatives. These parts are specifically designated for short haul LIU applications. Verify functional requirements against these substitutes if long haul features are not necessary.

FAQ

What line terminating impedances are supported?

The device supports four selectable line terminating impedances: 75 Ω, 100 Ω, 110 Ω, and 120 Ω.

How is the jitter attenuator configured?

The jitter attenuator can be placed in either the receive path or the transmit path, or it can be disabled entirely via software or hardware selection.

What loopback modes are available?

The chip supports analog loopback, digital loopback, remote loopback, and inband loopback functions.