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Timer IC.

Part number	8254 Programmable Interval Timer
Category	Integrated Circuits › Timers & Oscillators
Package	DIP-24
Pins	24

8254 Programmable Interval Timer pinout

Pin	Name	Type
1	D7	bidirectional
2	D6	bidirectional
3	D5	bidirectional
4	D4	bidirectional
5	D3	bidirectional
6	D2	bidirectional
7	D1	bidirectional
8	D0	bidirectional
9	CLK0	input
10	OUT0	output
11	G0	input
12	GND	ground
13	OUT1	output
14	G1	input
15	CLK1	input
16	G2	input
17	OUT2	output
18	CLK2	input
19	A0	input
20	A1	input
21	~CS	input
22	~RD	input
23	~WR	input
24	VCC	power

Schematic symbol and footprint

Schematic symbol

Footprint: DIP-24_W15.24mm — to scale, pad 1 in yellow (mm). Check against the datasheet before ordering PCBs.