XRT75L00DIV-F

Overview

The XRT75L00DIV-F is a single-channel Line Interface Unit (LIU) with a Sonet Desynchronizer designed for E3, DS3, and STS-1 applications. It integrates an independent receiver, transmitter, and jitter attenuator within a 52-pin TQFP package. The device operates on a single 3.3 V ± 5% power supply with 5 V tolerant I/O and supports an industrial temperature range of -40°C to +85°C. It features a crystal-less jitter attenuator selectable in the transmit or receive path, supporting FIFO sizes of 16, 32, or 128 bits. Control is managed via a 5-wire Serial Microprocessor Interface or hardware mode.

Feature Summary

• Integrates a crystal-less jitter attenuator compliant with ETSI TBR-24 and Bellcore GR-499 specifications.
• Supports configurable B3ZS/HDB3 encoding and decoding functions that can be independently enabled or disabled.
• Provides comprehensive diagnostic capabilities including PRBS generation/detection and multiple loop-back modes.
• Features a differential receiver with adaptive equalization capable of handling up to 20 dB flat loss.

Applications

• E3/DS3 Access Equipment
• DSLAMs
• Digital Cross Connect Systems
• CSU/DSU Equipment
• Routers

Procurement Notes

Verify component authenticity through authorized channels as this part may be subject to obsolescence. Confirm specific ordering suffixes against official documentation to ensure correct package and temperature ratings. Request manufacturer datasheets and compliance certificates prior to procurement to validate technical specifications and regulatory adherence.

Selection Notes

Select this component for designs requiring a fully integrated LIU with SONET desynchronization capabilities. Ensure the design accommodates the 52-pin TQFP footprint and 3.3V power domain. Verify interface compatibility with terminal equipment regarding single-rail or dual-rail data formats. Confirm that the required jitter attenuation performance aligns with the specified standards.

Part Context

This component belongs to the XRT75L00D series manufactured by MaxLinear (formerly Exar). It serves as a specialized telecom interface IC for high-speed digital transmission systems. The device consolidates line interface and synchronization functions into a single chip, reducing board space compared to discrete solutions.

Replacement Considerations

Consult official manufacturer documentation for confirmed substitute part numbers. Verify pinout compatibility and electrical characteristics before considering alternative components from other manufacturers.

FAQ

Can the B3ZS/HDB3 encoder and decoder be disabled?

Yes, the on-chip B3ZS/HDB3 encoder and decoder can be either enabled or disabled according to application requirements.

What jitter standards does the attenuator meet?

The jitter attenuator meets specifications described in T1.105.03b, ETSI TBR-24, Bellcore GR-253, and GR-499 standards.

How is the device controlled and configured?

The XRT75L00D provides both a 5-wire Serial Microprocessor Interface for host control and a Hardware Mode for configuration.