The Intersil 82C55A is a high performance CMOS version of the industry standard 8255A and is manufactured using a self-aligned silicon gate CMOS process (Scaled SAJI IV). The MX82C55A has identical features as the X82C55 with the exception of no bus hold devices on the port pins. It is a general purpose programmable I/O device which may be used with many different microprocessors. There are 24 I/O pins which may be individually programmed in two groups of 12 and used in three major modes of operation. The high performance and industry standard configuration of the 82C55A make it compatible with the 80C86, 80C88 and other microprocessors. Static CMOS circuit design insures low operating power. The Intersil advanced SAJI process results in performance equal to or greater than existing functionally equivalent products at a fraction of the power.


  • Pb-Free Plus Anneal Available (RoHS Compliant) (See Ordering Info)
  • Pin Compatible with OKI MSM82C55A
  • No Bus Hold Devices on any Port Pins
  • 24 Programmable I/O Pins
  • Fully TTL Compatible
  • High-Speed, No "Wait State" Operation with 8MHz 80C86 and 80C88
  • Direct Bit Set/Reset Capability
  • Enhanced Control Word Read Capability
  • L7 Process
  • 2.5mA Drive Capability on All I/O Ports
  • Low Standby Power (ICCSB) 10µA

Product Options

Part Number Part Status Pkg. Type Carrier Type MOQ Buy Sample
Active MQFP Tray 960
Active MQFP Reel 500
Active MQFP Tray 960
Active MQFP Reel 500

Documentation & Downloads

Title language Type Format File Size Date
Datasheets & Errata
MS82C55A, MQ82C55A, MP82C55A Datasheet Datasheet PDF 1.15 MB
PIN19008 - Q1 2019 Price Increase Notice Price Increase Notice PDF 200 KB
PIN19006 - Price Increase for the Listed Renesas Electronics America Products Price Increase Notice PDF 257 KB
Semiconductor Package Mount Manual 日本語, 简体中文 Other PDF 10.28 MB
PIN17006 - Q1 2017 Price Increase Price Increase Notice PDF 227 KB
Semiconductor Reliability Handbook 日本語 Other PDF 14.70 MB
QFN Mounting Manual 日本語, 简体中文 Other PDF 3.19 MB