One of the more famous of these devices is the 74181, a cascadable 4-bit arithmetic logic unit, or ALU. An ALU is the heart of a microprocessor, performing its operations. The 74181 appeared in ...

2 A 2-bit arithmetic logic unit. This is the width of the two input words on which the device performs arithmetic and logic operations. 4 A 4-bit arithmetic logic unit. This is the width of the two ...