4位算术逻辑单元 4-Bit Arithmetic Logic Unit
General Description
The performs three arithmetic and three logic operations on two 4-bit words, A and B. Two additional select input codes force the function outputs LOW or HIGH. Carry propagate and generate outputs are provided for use with the 74F182 carry lookahead generator for high-speed expansion to longer word lengths. For ripple expansion, refer to the 74F382 ALU data sheet.
Features
■ Low input loading minimizes drive requirements
■ Performs six arithmetic and logic functions
■ Selectable LOW clear and HIGH preset functions
■ Carry generate and propagate outputs for use with carry lookahead generator