4-Bit Arithmetic Logic Unit

The MC14581B is a CMOS 4–bit ALU capable of providing 16 functions of two Boolean variables and 16 binary arithmetic operations on two 14–bit words. The level of the mode control input determines whether the output function is logic or arithmetic. The desired logic function is selected by applying the appropriate binary word to the select inputs (S0 thru S3) with the mode control input high, while the desired arithmetic operation is selected by applying a low voltage to the mode control input, the required level to carry in, and the appropriate word to the select inputs. The word inputs and function outputs can be operated with either active high or active low data.

• Functional and Pinout Equivalent to 74181.

• Diode Protection on All Inputs

• All Outputs Buffered

• Supply Voltage Range = 3.0 Vdc to 18 Vdc

• Capable of Driving Two Low–power TTL Loads or One Low–power Schottky TTL Load over the Rated Temperature Range