XRT75VL00DIV

Overview

The XRT75VL00DIV is a single-channel Line Interface Unit (LIU) with an integrated SONET desynchronizer, manufactured by MaxLinear. It supports E3 (34.368 MHz), DS3 (44.736 MHz), and STS-1 (51.84 MHz) modes 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 functions across an industrial temperature range of -40°C to +85°C. Key electrical features include an advanced crystal-less jitter attenuator compliant with ETSI TBR-24 and Bellcore GR-499 standards, selectable FIFO sizes of 16, 32, or 128 bits, and an on-chip clock synthesizer generating clocks from a 12.288 MHz reference.

Feature Summary

• Integrates independent receiver, transmitter, and jitter attenuator sections for comprehensive line interface management.
• Features an advanced crystal-less jitter attenuator capable of operation in either transmit or receive paths.
• Includes built-in B3ZS/HDB3 encoder and decoder functionality that can be independently enabled or disabled.
• Supports local, remote, and digital loop-back configurations alongside onboard PRBS generator and detector.

Applications

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

Procurement Notes

Verify the specific ordering suffix DIV against current manufacturer documentation to confirm the 52-pin TQFP package and -40°C to +85°C industrial temperature rating. Confirm RoHS compliance status through official datasheets prior to procurement. Ensure compatibility with existing system voltage requirements, specifically the 3.3 V ± 5% supply constraint.

Selection Notes

Select this component for applications requiring a single-chip solution for E3, DS3, or STS-1 line interfacing with SONET de-synchronization capabilities. Consider the integrated jitter attenuator for systems needing compliance with strict ETSI and Bellcore specifications without external components. Evaluate the 52-pin TQFP footprint against available PCB space constraints.

Part Context

This part belongs to the XRT75L00 series of telecom interface ICs designed for high-performance line signaling. It serves as a specialized LIU combining physical layer transmission with network synchronization functions. The device addresses the need for compact, low-power solutions in telecommunications infrastructure where signal integrity and jitter management are critical.

Replacement Considerations

Consult official MaxLinear documentation for verified cross-reference part numbers. Do not substitute based on generic pinout similarities alone; verify functional equivalence regarding jitter attenuation and encoding standards.

FAQ

Can the jitter attenuator be used for clock smoothing?

Yes, the jitter attenuator can be utilized for clock smoothing during SONET STS-1 to DS3 de-mapping operations.

What encoding schemes are supported internally?

The device includes an on-chip B3ZS/HDB3 encoder and decoder, both of which can be enabled or disabled as needed.

How is the device controlled and configured?

Configuration is supported via a 5-wire Serial Microprocessor Interface in Host Mode or through direct Hardware Mode control.