October 1995

Order Number 231256-004

82C55A

CHMOS PROGRAMMABLE PERIPHERAL INTERFACE

Y

Compatible with all Intel and Most

Other Microprocessors

Y

High Speed ‘‘Zero Wait State’’

Operation with 8 MHz 808688 and

80186188

Y

24 Programmable IO Pins

Y

Low Power CHMOS

Y

Completely TTL Compatible

Y

Control Word Read-Back Capability

Y

Direct Bit SetReset Capability

Y

25 mA DC Drive Capability on all IO

Port Outputs

Y

Available in 40-Pin DIP and 44-Pin PLCC

Y

Available in EXPRESS

Standard Temperature Range

Extended Temperature Range

The Intel 82C55A is a high-performance CHMOS version of the industry standard 8255A general purpose

programmable IO device which is designed for use with all Intel and most other microprocessors It provides

24 IO 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 IO 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

The 82C55A is fabricated on Intel’s advanced CHMOS III technology which provides low power consumption

with performance equal to or greater than the equivalent NMOS product The 82C55A is available in 40-pin

DIP and 44-pin plastic leaded chip carrier (PLCC) packages

231256 – 1

Figure 1 82C55A Block Diagram

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231256 – 2

Figure 2 82C55A Pinout

Diagrams are for pin reference only Package

sizes are not to scale