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82C54

S E M I C O N D U C T O R

CMOS Programmable Interval Timer

March 1997

Features

Description

• 8MHz to 12MHz Clock Input Frequency

The Harris 82C54 is a high performance CMOS Programmable Interval Timer manufactured using an advanced 2 micron
CMOS process.

• Compatible with NMOS 8254
- Enhanced Version of NMOS 8253

The 82C54 has three independently programmable and
functional 16-bit counters, each capable of handling clock
input frequencies of up to 8MHz (82C54) or 10MHz
(82C54-10) or 12MHz (82C54-12).

• Three Independent 16-Bit Counters
• Six Programmable Counter Modes
• Status Read Back Command
• Binary or BCD Counting
• Fully TTL Compatible
• Single 5V Power Supply
• Low Power
- ICCSB . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10µA
- ICCOP . . . . . . . . . . . . . . . . . . . . . . . . . . 10mA at 8MHz
• Operating Temperature Ranges
- C82C54 . . . . . . . . . . . . . . . . . . . . . . . . . .0oC to +70oC
- I82C54 . . . . . . . . . . . . . . . . . . . . . . . . . -40oC to +85oC
- M82C54 . . . . . . . . . . . . . . . . . . . . . . . -55oC to +125oC

The high speed and industry standard conguration of the
82C54 make it compatible with the Harris 80C86, 80C88,
and 80C286 CMOS microprocessors along with many other
industry standard processors. Six programmable timer
modes allow the 82C54 to be used as an event counter,
elapsed time indicator, programmable one-shot, and many
other applications. Static CMOS circuit design insures low
power operation.
The Harris advanced CMOS process results in a signicant
reduction in power with performance equal to or greater than
existing equivalent products.

Pinouts

2

1

RD

NC

3

VCC

D7

4

WR

D6

82C54 (PLCC/CLCC)
TOP VIEW
D5

82C54 (PDIP, CERDIP, SOIC)
TOP VIEW

28

27

26

D7 1

24 VCC

D6 2

23 WR

D5 3

22 RD

D4 4

21 CS

D4

5

25 NC

D3 5

20 A1

D3

6

24 CS

D2 6

19 A0

D2

7

23 A1

D1 7

18 CLK 2

D1

8

22 A0

D0 8

17 OUT 2

D0

9

21 CLK2

CLK 0 9

16 GATE 2

OUT 0 10

15 CLK 1
14 GATE 1

19 GATE 2

13

14

15

16

17

NC

OUT 1

GATE 1

CAUTION: These devices are sensitive to electrostatic discharge. Users should follow proper IC Handling Procedures.
Copyright

© Harris Corporation 1997

4-215

18
CLK 1

12

GND

13 OUT 1
OUT 0

GND 12

20 OUT 2

NC 11

GATE 0

GATE 0 11

CLK 0 10

File Number

2970.1