DS21348T

Telecom Overview

The DS21348T is a single-channel, 3.3V E1/T1/J1 Line Interface Unit (LIU) manufactured by Analog Devices Inc./Maxim Integrated. It operates within a supply voltage range of 3.135V to 3.465V and supports an operating temperature range of 0°C to +70°C. The device is housed in a 44-pin TQFP package with surface-mount installation. It features a crystal-less jitter attenuator requiring only a 2.048MHz master clock for both E1 and T1 applications, with an option to use 1.544MHz for T1. The internal FIFO depth is selectable between 32 bits and 128 bits.

Telecom Feature Summary

• Supports long-haul and short-haul trunks with software-selectable receive-side termination for 75Ω, 100Ω, and 120Ω impedances.
• Generates appropriate line build-outs for E1 and DSX-1/CSU T1 applications, including options with and without return loss.
• Provides AMI, HDB3, and B8ZS encoding/decoding capabilities with programmable monitor modes and loopback functions.

Telecom Applications

• E1, T1, or J1 line interface units for short-haul and long-haul trunks
• Systems requiring crystal-less jitter attenuation with 2.048MHz master clock input
• Applications needing internal receive termination for 75Ω, 100Ω, or 120Ω lines

Telecom Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm the exact temperature range and package variant. Ensure that the procurement specifications align with the required operational environment and interface requirements before finalizing orders.

Telecom Selection Notes

Select the DS21348T when a single-channel LIU is required for 3.3V systems operating in commercial temperature ranges. Consider the available bus interfaces, including parallel and serial options, to match the host controller architecture. Verify compatibility with the required line coding standards and jitter attenuation needs.

Telecom Part Context

The DS21348T belongs to the DS21348 family of telecom interface ICs designed for E1/T1/J1 applications. This family includes variants with different temperature ratings and package types, such as the DS21348TN for industrial temperatures and the DS21348G in a CSBGA package. The DS21348T specifically targets commercial temperature environments.

Telecom Replacement Considerations

The DS21348TN serves as a direct replacement for extended temperature operation (-40°C to +85°C). Other family members like the DS21348G offer alternative packaging but require verification of pinout and electrical characteristics for compatibility.