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PAL20L8

Manufacturer: NSC

MOS DIGITAL INTERGRATED CIRCUIT SILICON GATE CMOS

Partnumber Manufacturer Quantity Availability
PAL20L8 NSC 1641 In Stock

Description and Introduction

MOS DIGITAL INTERGRATED CIRCUIT SILICON GATE CMOS **Introduction to the PAL20L8 from National Semiconductor (NSC)**  

The **PAL20L8** is a programmable array logic (PAL) device developed by **National Semiconductor (NSC)**. As part of the PAL family, it is designed for implementing custom digital logic functions efficiently. The device features a fixed OR array and a programmable AND array, allowing designers to create tailored logic circuits without requiring full-custom IC design.  

With **20 inputs and 8 outputs**, the PAL20L8 is well-suited for applications requiring moderate logic complexity, such as address decoding, state machine control, and interface logic. Its outputs are **active-low (L)**, making it compatible with systems that utilize negative logic. The device operates on standard TTL voltage levels and is housed in a **dual in-line package (DIP)**, ensuring ease of integration into existing circuit designs.  

One of the key advantages of the PAL20L8 is its **one-time programmable (OTP)** architecture, which provides a cost-effective solution for low- to medium-volume production. While modern CPLDs and FPGAs have largely replaced PALs in many applications, the PAL20L8 remains relevant in legacy systems and educational contexts due to its simplicity and reliability.  

In summary, the PAL20L8 represents a classic yet functional approach to programmable logic, offering a balance of performance and flexibility for embedded digital designs.

Application Scenarios & Design Considerations

MOS DIGITAL INTERGRATED CIRCUIT SILICON GATE CMOS

Alternative Part Number

  • TIBPAL20L8-15CNT --: Direct functional equivalent of the PAL20L8 in TI's PAL family, same 20-input 8-output architecture and 15 ns speed grade.
  • AMPAL20L8PC --: AMD programmable array logic device matching the PAL20L8 logic configuration, pin-compatible DIP package.
  • GAL20V8 --: Generic array logic replacement that can emulate the PAL20L8 function and is electrically reprogrammable, widely used as a drop-in substitute.
  • PAL20L8BCNS --: AMD second-source PAL20L8 device with the same 20-input 8-output AND-OR array, suitable as a drop-in replacement for NSC parts.

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