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Logic IC.

Part number	74LS181 4-Bit Arithmetic Logic Unit
Category	Integrated Circuits › Logic Gates
Package	DIP-24
Pins	24
Resolution	4 bit

74LS181 4-Bit Arithmetic Logic Unit pinout

Pin	Name	Type
1	B0	input
2	A0	input
3	S3	input
4	S2	input
5	S1	input
6	S0	input
7	Cn	input
8	M	input
9	F0	output
10	F1	output
11	F2	output
12	GND	ground
13	F3	output
14	A=B	output
15	X	output
16	Cn+4	output
17	Y	output
18	B3	input
19	A3	input
20	B2	input
21	A2	input
22	B1	input
23	A1	input
24	VCC	power

Schematic symbol and footprint

Schematic symbol

Footprint: DIP-24_W7.62mm — to scale, pad 1 in yellow (mm). Check against the datasheet before ordering PCBs.