October 1994

Order Number 231244-006

82C54

CHMOS PROGRAMMABLE INTERVAL TIMER

Y

Compatible with all Intel and most

other microprocessors

Y

High Speed ‘‘Zero Wait State’’

Operation with 8 MHz 808688 and

80186188

Y

Handles Inputs from DC

10 MHz for 82C54-2

Y

Available in EXPRESS

Standard Temperature Range

Extended Temperature Range

Y

Three independent 16-bit counters

Y

Low Power CHMOS

8 MHz Count

frequency

Y

Completely TTL Compatible

Y

Six Programmable Counter Modes

Y

Binary or BCD counting

Y

Status Read Back Command

Y

Available in 24-Pin DIP and 28-Pin PLCC

The Intel 82C54 is a high-performance CHMOS version of the industry standard 8254 countertimer which is

designed to solve the timing control problems common in microcomputer system design It provides three

independent 16-bit counters each capable of handling clock inputs up to 10 MHz All modes are software

programmable The 82C54 is pin compatible with the HMOS 8254 and is a superset of the 8253

Six programmable timer modes allow the 82C54 to be used as an event counter elapsed time indicator

programmable one-shot and in many other applications

The 82C54 is fabricated on Intel’s advanced CHMOS III technology which provides low power consumption

with performance equal to or greater than the equivalent HMOS product The 82C54 is available in 24-pin DIP

and 28-pin plastic leaded chip carrier (PLCC) packages

231244 – 1

Figure 1 82C54 Block Diagram

231244 – 3

PLASTIC LEADED CHIP CARRIER

231244 – 2

Diagrams are for pin reference only

Package sizes are not to scale

Figure 2 82C54 Pinout