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PAL20X4NC from NS,National Semiconductor

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PAL20X4NC

Manufacturer: NS, NS/MMI

Progammable Array Logic Series 24 (PAL Series 24)

Partnumber Manufacturer Quantity Availability
PAL20X4NC NS, NS/MMI 139 In Stock

Description and Introduction

Progammable Array Logic Series 24 (PAL Series 24) **Introduction to the PAL20X4NC Programmable Array Logic (PAL) Device**  

The **PAL20X4NC** is a programmable array logic (PAL) device developed by **National Semiconductor (NS) and Monolithic Memories Inc. (MMI)**. As part of the PAL family, it provides a flexible solution for implementing custom combinational and sequential logic circuits. The device features a fixed OR-array and a programmable AND-array, allowing designers to create tailored logic functions efficiently.  

With **20 inputs and 4 outputs**, the PAL20X4NC is well-suited for medium-complexity digital designs, including state machines, address decoding, and control logic. Its architecture supports both registered and combinatorial output configurations, enhancing its versatility. The device operates on standard TTL voltage levels and is designed for reliable performance in industrial and commercial applications.  

Key features include **high-speed operation**, **low power consumption**, and **ease of programmability** using industry-standard development tools. The PAL20X4NC is housed in a durable **DIP (Dual In-line Package)**, ensuring compatibility with traditional through-hole PCB designs.  

As an early-generation programmable logic device, the PAL20X4NC played a significant role in simplifying digital circuit design before the advent of more advanced CPLDs and FPGAs. Its legacy continues to be relevant for educational purposes and legacy system maintenance.

Application Scenarios & Design Considerations

Progammable Array Logic Series 24 (PAL Series 24)

Alternative Part Number

  • TIBPAL20X4-15CNT --: Same PAL20X4 architecture with 20 inputs and 4 outputs, direct functional replacement from the original PAL family line.
  • EP20K4 --: Equivalent 20-input 4-output programmable logic device, widely available and pin-compatible in most legacy sockets.
  • GAL20V8 --: Generic array logic device that can be programmed to emulate the PAL20X4 function, offering a flexible modern alternative.
  • TIBPAL20X4-15CNT --: TI's pin-compatible PAL20X4 replacement in the TIBPAL series, offering equivalent 20X4 programmable array logic with similar speed and DIP package.
  • PAL20X4ACNS --: AMD PAL20X4AC device with compatible 24-pin DIP pinout and equivalent 20X4 architecture, suitable as a direct functional substitute.
  • GAL20V8B-15LP --: Generic array logic device that can emulate the PAL20X4 function, offering a flexible and widely available alternative with reprogrammable logic.

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