PM4351-NI

Telecom Overview

The PM4351-NI is a monolithic, software-selectable transceiver integrating E1/T1/J1 framers and line drivers for short-haul and long-haul applications. It operates on a 3.3V supply within a -40°C to +85°C temperature range. The device supports rates of 1.544 Mbit/s, 2.048 Mbit/s, 4.096 Mbit/s, and 8.192 Mbit/s. It features an 8-bit microprocessor bus interface, JTAG compliance, and programmable binary sequence generators.

Telecom Feature Summary

• Integrates full-featured T1/E1 framers with software-selectable line interfaces
• Supports encoding and decoding of B8ZS, HDB3, and AMI line codes
• Includes three HDLC controllers with 128-byte transmit/receive FIFO buffers
• Provides receive equalization, clock recovery, and jitter attenuation

Telecom Applications

• T1 and E1 network access equipment
• Short-haul and long-haul telecommunication systems
• PCM backplane implementations compatible with Mitel ST-bus or AT&T CHI

Telecom Procurement Notes

Verify component authenticity through authorized Microchip Technology distributors. Confirm package integrity and pin alignment against the 81-ball CBGA specification. Ensure compatibility with existing system voltage levels and interface protocols before integration.

Telecom Selection Notes

Select this component for applications requiring integrated framer and line driver functionality in a single monolithic device. Consider its support for multiple data rates and standard line codes when designing telecom infrastructure. Evaluate thermal requirements against the specified operating temperature range.

Telecom Part Context

This part belongs to the PM4351 series of telecom interface ICs originally developed by PMC-Sierra, now under Microchip Technology. It serves as a comprehensive solution for digital transmission standards, combining framing, line driving, and control logic into one high-density package.

Telecom Replacement Considerations

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