NS32FX164AV-25

Overview

The NS32FX164AV-25 is a high-performance 32-bit microprocessor from the Series 32000/EP family, optimized for CCITT Group 2 and 3 facsimile applications, data modems, and laser printers. It features a CPU core compatible with the NS32CG16, incorporating a 32-bit ALU, instruction pipeline, and an 8-byte prefetch queue. Integrated on-chip are a Digital Signal Processing Module (DSPM) and a 4K-byte RAM array. The device supports a 16 Mbyte linear external address space via a 16-bit external data bus and includes an on-chip clock generator. Operating at a maximum frequency of 25 MHz, it utilizes high-speed CMOS technology.

Feature Summary

• Integrated DSP Module for autonomous high-speed digital signal processing parallel to the CPU core
• 18 specialized graphics instructions supporting BITBLT operations, pattern magnification, and RLL encoding
• 4K-byte on-chip RAM array shared between the CPU core and the DSP Module
• Software compatibility with the broader Series 32000/EP processor family

Applications

• Stand-alone Fax systems
• PC add-in Fax/Voice/Data Modem cards
• Laser/Fax printing systems
• Voice mail systems

Procurement Notes

Verify the component status as obsolete in current market channels. Confirm that the AV suffix denotes the 25 MHz speed grade and plastic package variant. Ensure sourcing from authorized distributors or verified surplus suppliers due to end-of-life status.

Selection Notes

Select this model for applications requiring software compatibility with existing Series 32000 codebases while needing integrated DSP capabilities. The 25 MHz speed rating suits moderate-frequency control tasks. Consider the 68-pin PLCC package constraints for PCB layout and thermal management during selection.

Part Context

This component belongs to the National Semiconductor Series 32000/EP embedded system processor family. It shares architectural similarities with the NS32FX161 and NS32FV16, differing primarily in memory size and specific feature sets. The NS32FX164 represents a specialized iteration designed to reduce external logic requirements for imaging and communication tasks.

Replacement Considerations

No direct public substitute part numbers are confirmed. Legacy designs may require architectural migration to modern 32-bit processors with equivalent DSP cores.