82C55A Datasheet PDF – Programmable Peripheral Interface Chip

Part Number: 82C55A


Package: DIP 40 or PLCC 44 pin

Manufacturer: Intel


82C55A datasheet


The Intel 82C55A is a high-performance, CHMOS version of the industry standard 8255A general purpose programmable I/O device which is designed for use with all Intel and most other microprocessors. It provides 24 I/O pins which may be individually programmed in 2 groups of 12 and used in 3 major modes of operation. The 82C55A is pin compatible with the NMOS 8255A and 8255A-5. In MODE 0, each group of 12 I/O pins may be programmed in sets of 4 and 8 to be inputs or outputs. In MODE 1, each group may be programmed to have 8 lines of input or output. 3 of the remaining 4 pins are used for handshaking and interrupt control signals. MODE 2 is a strobed bi-directional bus configuration.

Reference Site: https://en.wikipedia.org/wiki/Intel_8255


1. Compatible with all Intel and Most Other Microprocessors
2. 24 Programmable I/O Pins
3. Low Power CHMOS
4. Completely TTL Compatible
5. Control Word Read-Back Capability


Block Diagram


Other data sheets are available within the file: 82C55

82C55A Datasheet PDF Download

82C55A pdf