82C54 Programmable Interval Timer

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The 82C54 is a high-performance CMOS Programmable Interval Timer manufactured using an advanced 2 micron CMOS process. 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, 12MHz (82C54-12). The high speed and industry standard configuration of the 82C54 make it compatible with the Intersil 80C86, 80C88, and 80C286 CMOS microprocessors along with many other industry-standard processors.

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82C54 Pinout

82C54 Pin Configuration

Pin Number	Pin Name	Description
1	D7-D0	Data Pins
2	CLK 0	Clock Pin 0
3	OUT 0	Output Pin 0
4	Gate 0	Gate Pin 0
5	GND	Ground Pin
6	OUT 1	Output Pin 1
7	Gate 1	Gate Pin 1
8	CLK 1	Clock Pin 1
9	Gate 2	Gate Pin 2
10	OUT 2	Output Pin 2
11	CLK 2	Clock Pin 2
19-20	A0-A1	Port A
21	CS	Chip Select
22	RD	Read Pin
23	WR	Write Pin
24	VCC	Supply Voltage