INTRODUCTION
The Intel 85C220/85C224 8-micron CHMOS μPLD(Microcomputer Programmable Logic Device) is capable of implementing over 300 equivalent gates of user-customized logic functions through programming. With its flexible I/O architecture and fast speeds, this device has functional capabilities that surpass those of typical programmable logic devices. This device can be used to upgrade high-speed bipolar programmable logic devices and 74-series LS and CMOS SSI and MSI logic devices in bus control and state-machine applications for Advanced intel Microprocessors, i486™, Intel386™, and intel i860™-based systems and other high-performance processors. The 85C220/85C224 can also be used as a direct, low-power replacement for almost all high-speed 20-pin and 24-pin fuse-based programmable logic devices.