This file is an introduction to Intersil 82C55A CMOS Programmable Peripheral Interface, which is a high-performance CMOS version of the industry standard 8255A, manufactured using a self-aligned silicon gate CMOS process (Scaled SAJI IV), is a general-purpose programmable I / O device that can be used with many different microprocessors.
The Intersil 82C55A is a high‑performance CMOS version of the industry‑standard 8255A programmable peripheral interface. It offers 24 programmable I/O pins, TTL compatibility, low power consumption and a range of package options such as PDIP, PLCC and MQFP.
The datasheet details pin descriptions, functional block diagrams, operating modes (Basic I/O, Strobed I/O, Bidirectional Bus), timing diagrams, and mechanical dimensions for each package. It also includes ordering information, electrical characteristics, and handling cautions.
| Operating temperature range | -55 °C to 125 °C |
|---|---|
| Supply voltage | +5 V |
| I/O drive capability | 2.5 mA per port |
| Low standby power | 10 µA |
Yes, the 82C55A is pin compatible with the NMOS 8255A.
A high on RESET initializes the control register to 9Bh and sets all ports (A, B, C) to input mode.
Mode 0 – Basic Input/Output, Mode 1 – Strobed Input/Output, and Mode 2 – Bidirectional Bus.