TP3406N/NOPB

Telecom Overview

The TP3406 is a monolithic transceiver for data transmission on twisted pair subscriber loops, built on National Semiconductor's double poly microCMOS process. It operates from a single +5V supply and supports full-duplex transmission at 144 kb/s using burst-mode Time Compression Multiplexing. The device implements Alternate Mark Inversion (AMI) line coding with a transmit filter and scrambler to minimize electromagnetic interference. It functions as an ISDN 'U' Interface for short loop applications, typically within PBX environments, providing transmission for two B channels and one D channel over up to 800 meters of #24 AWG cable.

Telecom Feature Summary

• Supports full-duplex 144 kb/s communication on a single twisted wire pair via burst-mode operation
• Integrates AMI line coding, pulse shaping filters, and a 9-bit scrambler for spectral efficiency
• Includes adaptive line equalizer and on-chip timing recovery circuits
• Features MICROWIRE compatible serial control interface for master/slave configuration

Telecom Applications

• PBX Line Cards
• ISDN Terminals
• Regenerators

Telecom Procurement Notes

Verify the specific package suffix when ordering, as the datasheet identifies the standard part number as TP3406V in a 28-pin PLCC package. Confirm that the NOPB suffix aligns with lead-free manufacturing standards if required by your assembly process. Ensure the design accommodates the single +5V supply requirement and the necessary external crystal or clock source for the MCLK/XTAL pin.

Telecom Selection Notes

Select this component for short-loop ISDN U-interface applications requiring a complete monolithic solution. It is suitable for systems utilizing Master/Slave timing configurations where the line card acts as the master. Consider the 800-meter range limitation on #24 AWG cable when designing the network topology. Ensure the host processor supports the MICROWIRE protocol for device initialization and status monitoring.

Telecom Part Context

The TP3406 is part of the DASL (Digital Adapter for Subscriber Loops) family designed for ISDN applications. It replaces discrete solutions for line interfacing and timing recovery. The device integrates functions previously handled by multiple components, including the line driver, equalizer, and digital interface logic, simplifying the PCB layout for PBX and terminal equipment.

Telecom Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.