74181 Arithmetic Logic Unit/Function Generator 5V IC DIP-24 (Wide)

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74181 Arithmetic Logic Unit /Function Generator 5V IC DIP-24 The 74181 Arithmetic Logic Unit (ALU) is a classic TTL integrated circuit that performs high-speed 4-bit arithmetic and logic operations. It is capable of executing 16 arithmetic functions and 16 logic functions, making it a fundamental building block in early microprocessors, minicomputers, digital controllers, and educational computer architecture projects. The operation is selected through four function-select inputs and a mode control input, allowing flexible implementation of mathematical and logical computations. Designed for expansion into wider data paths, the 74181 supports carry propagation and carry look-ahead operation when used with external carry look-ahead circuitry. It provides outputs for carry generate and propagate signals, enabling efficient cascading of multiple ALUs for 8-bit, 16-bit, or larger arithmetic systems. The IC remains popular for digital logic education, retro-computing projects, and custom CPU designs due to its versatility and historical significance. Features: High-speed 4-bit Arithmetic Logic Unit. Performs both arithmetic and logic functions. Supports 16 arithmetic operations. Supports 16 logic operations. Function selection via four control inputs. Separate arithmetic and logic operating modes. Carry generate and carry propagate outputs. Carry look-ahead compatible. Easily cascaded for wider data processing. TTL logic compatible. Through-hole DIP package. Suitable for educational and industrial digital circuits. Reliable and proven architecture. Specifications: TYPE DESCRIPTION Category Integrated Circuits (ICs) Logic Series 74LS Logic Type Arithmetic Logic Unit Supply Voltage 4.75V ~ 5.25V Operating Temperature 0°C ~ 70°C Mounting Type Through Hole Package / Case 24-DIP (0.600″, 15.24mm) Base Product Number 74LS181 Pin Configuration: Pin No Pin Name Description 1 B 0 ‘ Active low Operand Input B 0 ‘ 2 A 0 ‘ Active low Operand Input 3 S 3 Function Select Input S 3 4 S 2 Function Select Input S 2 5 S 1 Function Select Input S 1 6 S 0 Function Select Input S 0 7 C n Carry Input 8 M Mode Control Input 9 F 0 ‘ Function Output F 0 ‘ 10 F 1 ‘ Function Output F 1 ‘ 11 F 2 ‘ Function Output F 2 ‘ 12 GND Ground Pin 13 F 3 ‘ Function Output F 3 ‘ 14 A=B Comparator Output 15 P’ Active low carry propagate 16 C n+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 V CC Chip Supply Voltage Applications: Digital arithmetic circuits. Computer architecture projects. Educational CPU designs. Binary calculators. Logic processing systems. Digital control units. ALU expansion circuits. Industrial digital controllers. Retro computer restoration. Embedded digital logic systems. Package Includes: 1x 74181 Arithmetic Logic Unit/Function Generator 5V IC DIP-24 (Wide). Documents: 74181.