DS3254A3+

Telecom Overview

The DS3254A3+ is a quad Line Interface Unit (LIU) designed for physical layer interfacing to DS3, E3, or STS-1 lines. It integrates four independent LIUs within a single 144-pin Thermally Enhanced CSBGA package measuring 13mm x 13mm. The device operates on a 3.3V supply with 5V tolerant I/O and supports an industrial temperature range of -40°C to +85°C. Each port features independent receive and transmit paths, a built-in jitter attenuator, and an on-chip clock adapter that generates line-rate clocks from a single input source.

Telecom Feature Summary

• Supports standards-compliant transmit waveshaping and receive clock/data recovery for up to 440 meters of coaxial cable.
• Includes a built-in jitter attenuator with provisionable buffer depths of 16, 32, 64, or 128 bits.
• Features an on-chip clock adapter capable of generating all line-rate clocks from a single master clock input.
• Provides three control interface options: 8-bit parallel, SPI, and hardware mode.

Telecom Applications

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

Telecom Procurement Notes

Verify the specific suffix 'A3' against official documentation to confirm exact manufacturing lot details or revision status. Confirm RoHS compliance status as indicated in current datasheets. Check for any Product Change Notifications regarding obsolescence or pinout modifications before finalizing procurement plans.

Telecom Selection Notes

Select this component when a quad-port solution is required for DS3, E3, or STS-1 interfaces. Ensure the design accommodates the 144-pin TE-CSBGA footprint. Verify that the system timing architecture can support the single-input clock requirement of the internal clock adapter for synthesizing necessary line rates.

Telecom Part Context

This part belongs to the DS325x family, which includes single (DS3251), dual (DS3252), triple (DS3253), and quad (DS3254) variants. All devices share identical functional blocks and are pin-compatible across the family, allowing for scalable design implementations using the same core technology.

Telecom Replacement Considerations

The datasheet identifies the DS3254 as a drop-in replacement for the DS3154 LIU. Verify electrical compatibility and register mapping if migrating from legacy parts. No other direct substitutes are documented in the provided text.

Telecom FAQ

What control interface modes does the DS3254 support?

The device supports three control interface options: 8-bit parallel, SPI serial, and hardware mode.

Can the jitter attenuator be disabled?

Yes, the built-in jitter attenuator can be placed in the receive path, the transmit path, or disabled entirely.

What encoding formats are supported?

The device supports B3ZS and HDB3 encoding and decoding for both transmit and receive paths.