74LS181 Arithmetic Logic Unit/Function Generator

The 74LS series of integrated circuits (ICs) was one of the most popular logic families of transistor-transistor logic (TTL) logic chips. 74LS series is a bipolar, low-power Schottky IC. The 74LS181 is an arithmetic logic unit (ALU} function generator that has a complexity of 75 equivalent gates on a monolithic chip. These circuits perform 16 binary arithmetic operations on two 4-bit words

74LS181 Features

• Full Look-Ahead for High-Speed Operations on Long Words
• Input Clamping Diodes Minimize Transmission-Line Effects
• Darlington Outputs Reduce Turn-Off Time

74LS181 Specifications

Supply Voltage	4.75 – 5.25Vdc
Maximum Clock Frequency	40Mhz
Power Dissipation	2mW/gate @100kHz
Minimum Output Current	8mA
Propagation Delay	10nS
Fan Out (TTL Loads)	20

74LS181 Pinout Diagram

74LS181 Pin Description

Pin No	Pin Name	Description
1	B0	Active low Operand Input B0
2	A0	Active low Operand Input
3	S3	Function Select Input S3
4	S2	Function Select Input S2
5	S1	Function Select Input S1
6	S0	Function Select Input S0
7	Cn	Carry Input
8	M	Mode Control Input
9	F0	Function Output F0
10	F1	Function Output F1
11	F2	Function Output F2
12	GND	Ground Pin
13	F’3	Function Output F’3
14	A=B	Comparator Output
15	P’	Active low carry propagate
16	Cn+4	Carry Output
17	G’	Active low-carry generator
18	B’3	Active low Operand Input B’3
19	A’3	Active low Operand Input A’3
20	B’2	Active low Operand Input B’2
21	A’2	Active low Operand Input A’2
22	B’1	Active low Operand Input B’1
23	A’1	Active low Operand Input A’1
24	VCC	Chip Supply Voltage

Applications

• Enables computers to perform mathematical operations on binary numbers

Download the 74LS181 Arithmetic Logic Unit/Function Generator Datasheet from the link given below.