PAL器件是近几年才出现的一种实现数字系统的大规模集成芯片。它不仅能实现组合逻辑电路,而且也能实现时序逻辑电路,可用单片或几片PAL器件来实现过去十几片、几十片中小规模集成电路所实现的数字系统。它具有体积小、价格低、功能强、可加密、高可靠性和使用方便灵活的特点。本文详细介绍了PAL器件的结构、工作原理及应用,并简略地介绍了PA的编程方法 . PAL devices have emerged in recent years to achieve a large scale integrated digital chip system. It not only can realize the combinational logic circuit, but also can realize the sequential logic circuit, can realize the digital system that the past few dozen, dozens of small and medium scale integrated circuits realize by the single piece or a few pieces of PAL device. It has small size, low price, strong function, encryption, high reliability and easy to use and flexible features. This article describes in detail the structure of the PAL device, working principle and application, and briefly introduces the PA programming.