DS3254N

Telecom Overview

The DS3254N is a quad-line interface unit (LIU) designed for physical layer interfacing to DS3, E3, or STS-1 telecommunications lines. It operates on a single 3.3V power supply with 5V-tolerant I/O and supports an industrial temperature range from -40°C to +85°C. The device integrates four independent channels within a 144-pin thermally enhanced CSBGA package measuring 13mm x 13mm. Each channel features built-in jitter attenuation and clock recovery capabilities.

Telecom Feature Summary

• Supports B3ZS/HDB3 encoding and decoding for compliant signal transmission
• Integrates a clock adapter synthesizing line-rate clocks from a single input source
• Provides three control interface options: 8-bit parallel, SPI, and hardware mode
• Includes local and remote loopback functions for diagnostic testing

Telecom Applications

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

Telecom Procurement Notes

Verify the specific revision of the component against current errata documentation before finalizing designs. Confirm that the 144-pin TE-CSBGA package dimensions align with the target PCB layout constraints. Ensure the design accommodates the required thermal dissipation characteristics for the specified operating temperature range.

Telecom Selection Notes

Select this model when four independent LIU ports are required in a compact form factor. Verify compatibility with the system's master clock frequencies, such as 19.44MHz or 77.76MHz, to ensure proper clock synthesis. Evaluate the need for SPI versus parallel interfaces based on available processor resources and pin count limitations.

Telecom Part Context

This component belongs to the DS325x family, which includes single, dual, and triple port variants. It serves as a drop-in replacement for older DS3154 devices while offering enhanced integration. The quad configuration allows for higher density deployments in telecom equipment compared to lower-channel counterparts.

Telecom Replacement Considerations

DS3154 is a confirmed direct replacement candidate.