描述 Description

The CD40181BMS is a low power four bit parallel arithmetic logic unit (ALU) capable of providing 16 binary arithmetic operations on two four-bit words and 16 logical functions of two Boolean variables. The mode control input M selects logical (M = High) or arithmetic (M = Low) operation. The four select inputs (S0, S1, S2, and S3) select the desired logical or arithmetic functions, which include AND, OR, NAND, NOR and exclusive-OR and-NOR in the logic mode, and addition, subtraction, decrement, left-shift and straight transfer in the arithmetic mode, according to the truth table. The CD40181BMS operation may be interpreted with either active-low or active-high data at the A and B word inputs and the function outputs F, by using the appropriate truth table.

特性 Features

? High Voltage Type (20V Rating)

? Full Look Ahead Carry for Speed Operations on Long Words

? Generates 16 Logic Functions of Two Boolean Variables

? Generates 16 Arithmetic Functions of Two 4 Bit Binary Words

? A = B comparator Output Available

? Ripple Carry Input and Output Available

? Typical Addition Time 200ns at VDD = 10V

? 100 Tested for Quiescent Current at 20V

? 5V, 10V and 15V Parametric Ratings

? Maximum Input Current of 1μA at 18V Over Full Pack

age Temperature Range; 100nA at 18V and +25°C

? Noise Margin (Over Full Package/Temperature Range)

- 1V at VDD = 5V

- 2V at VDD = 10V

- 2.5V at VDD = 15V

? Standardized Symmetrical Output Characteristics

? Meets All Requirements of JEDEC Tentative Standard No. 13B, “Standard Specifications for Description of ‘B’ Series CMOS Devices”