7-1400

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

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CD40181BMS

CMOS 4 Bit Arithmetic Logic Unit

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.

The CD40181BMS contains logic for full look ahead carry

operation for fast carry generation using the carry-generate

and carry-propagate outputs G and P for the four bits of the

CD40181BMS. Use of the CD40182BMS look-ahead carry

generator in conjunction with multiple CD40181BMS’s

permits high speed arithmetic operations on long words. A

ripple carry output Cn+4 is available for use in systems

where speed is not of primary importance.

Also included in the CD40181BMS is a comparator output

A = B, which assumes a high level whenever the two four-bit

input words A and B are equal and the device is in the

subtract mode. In addition, relative magnitude information

may be derived from the carry-in input Cn and ripple carry-

out output Cn+4 by placing the unit in the subtract mode and

externally decoding using the information in Table B.

The CD40181BMS is similar to industry types MC14581 and

74181.

The CD40181BMS is supplied in these 24-lead outline

packages:

Braze Seal DIP

HNZ

Ceramic Flatpack

H4P

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 1

µA at 18V Over Full Pack-

• 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”

Applications

• Parallel Arithmetic Units

• Process Controllers

• Low Power Minicomputers

Pinout

CD40181BMS ACTIVE-LOW DATA

TOP VIEW

1

2

3

4

5

6

7

8

9

10

11

12

B0

A0

S3

S2

S1

S0

Cn

M

F0

F1

F2

VSS

16

17

18

19

20

21

22

23

24

15

14

13

VDD

B1

A2

B2

A3

G

P

A = B

F3

A1

B3

Cn+4

December 1992

File Number

3361