DS21348TN

Telecom Overview

The DS21348TN is a single-channel Line Interface Unit (LIU) designed for E1, T1, and J1 telecommunications applications. It operates on a 3.3V power supply within an industrial temperature range of -40°C to +85°C. The device is housed in a 44-pin Thin Quad Flat Package (TQFP). Key electrical parameters include a maximum operating temperature of +85°C and a minimum operating temperature of -40°C. Supply voltage specifications define a maximum of 3.465V and a minimum of 3.135V. The component supports both long-haul and short-haul trunk configurations.

Telecom Feature Summary

• Complete line interface unit supporting E1, T1, and J1 standards with internal software-selectable receive-side termination options.
• Integrated crystal-less jitter attenuator requiring only a 2.048MHz master clock for both E1 and T1 applications.
• Generates appropriate line build-outs with or without return loss compensation for E1 and DSX-1/CSU T1 lines.
• Supports AMI, HDB3, and B8ZS encoding and decoding with programmable monitor modes and diagnostic loopbacks.

Telecom Applications

• Short-haul and long-haul E1/T1/J1 trunk interfaces
• Digital cross-connect systems (DSX-1) and Channel Service Units (CSU)
• Telecommunications network equipment requiring LIU functionality

Telecom Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and temperature rating. Ensure compatibility with 3.3V logic levels and check for lead-free compliance requirements if applicable. Confirm availability through authorized distributors as stock levels fluctuate.

Telecom Selection Notes

Select the DS21348TN when a single-channel solution for E1, T1, or J1 is required. Choose this part over the DS21348T if operation below 0°C is necessary. Consider the DS21Q348 variant if four channels are needed instead of one. Verify that the system design accommodates the 44-pin TQFP footprint.

Telecom Part Context

The DS21348TN belongs to the Maxim Integrated DS21348 family of telecom interface ICs. It serves as a complete Line Interface Unit (LIU) for digital transmission systems. The 'TN' suffix specifically denotes the industrial temperature grade (-40°C to +85°C) and the 44-pin TQFP package configuration.

Telecom Replacement Considerations

The DS21348T+ is a compatible alternative offering the same functionality but restricted to the commercial temperature range (0°C to +70°C). Designers requiring extended temperature performance must retain the TN suffix. No other direct pin-compatible replacements are documented in the provided source material.