DS3253A3

Telecom Overview

The DS3253A3 is a triple Line Interface Unit (LIU) designed for physical layer interfacing to DS3, E3, or STS-1 lines. It integrates independent receive and transmit paths with built-in jitter attenuators and an on-chip clock adapter that generates line-rate clocks from a single input source. The device supports B3ZS/HDB3 encoding and decoding, standards-compliant transmit waveshaping, and three control interface options: 8-bit parallel, SPI, and hardware mode. It operates at low-power 3.3V with 5V tolerant I/O and is housed in a 144-pin thermally enhanced CSBGA package.

Telecom Feature Summary

• Triple LIU architecture with independent receive and transmit paths
• Integrated jitter attenuator with provisionable buffer depth
• On-chip clock adapter generating multiple line-rate clocks from one input
• Supports B3ZS/HDB3 encoding and decoding

Telecom Applications

• SONET/SDH and PDH Multiplexers
• Digital Cross-Connects
• Access Concentrators
• ATM and Frame Relay Equipment
• Routers

Telecom Procurement Notes

Verify the specific suffix 'A3' against official manufacturer documentation to confirm temperature range and package configuration. Ensure compatibility with existing system timing requirements and control interface modes before procurement.

Telecom Selection Notes

Select this component when a triple-port solution is required for DS3, E3, or STS-1 interfaces. Consider the integrated clock adapter and jitter attenuation capabilities to simplify board design. Verify pin compatibility if replacing legacy devices like the DS3153.

Telecom Part Context

The DS3253A3 belongs to the DS325x family of Line Interface Units, which includes single (DS3251), dual (DS3252), and quad (DS3254) variants. These devices share identical functional blocks and pinouts, differing only in the number of integrated LIU ports.

Telecom Replacement Considerations

The datasheet identifies the DS325x series as a drop-in replacement for the DS3151/52/53/54 LIUs. Verify pin-to-pin compatibility and register mapping differences when migrating from older generations.