74LS181 - 4-Bit Arithmetic Logic Unit (ALU)

The SN74LS181N is a bit slice arithmetic logic unit (ALU), implemented as a 7400 series TTL integrated circuit. The first complete ALU on a single chip,[1] it was used as the arithmetic/logic core in the CPUs of many historically significant minicomputers and other devices.

Features:

• The 74181 represents an evolutionary step between the CPUs of the 1960s, which were constructed using discrete logic gates, and today’s single-chip CPUs or microprocessors.
• Provides 16 Arithmetic Operations Add, Subtract, Compare, Double, Plus Twelve Other Arithmetic Operations
• Provides all 16 Logic Operations of Two Variables Exclusive — OR, Compare, AND, NAND, OR, NOR, Plus Ten other Logic Operations
• Full Lookahead for High Speed Arithmetic Operation on Long Words
• Input Clamp Diodes