TLF5944

February 1988

CD4008BMCD4008BC 4-Bit Full Adder

General Description

The CD4008B types consist of four full-adder stages with

fast look-ahead carry provision from stage to stage Circuitry

is included to provide a fast ‘‘parallel-carry-out’’ bit to permit

high-speed operation in arithmetic sections using several

CD4008B’s CD4008B inputs include the four sets of bits to

be added A1 to A4 and B1 to B4 in addition to the ‘‘Carry

in’’ bit from a previous section CD4008B outputs include

the four sum bits S1 and S4 in addition to the high-speed

‘‘parallel-carry-out’’ which may be utilized at a succeeding

CD4008B section

All inputs are protected from damage due to static dis-

Features

Y

Wide supply voltage range

30V to 15V

Y

High noise immunity

Y

Low power TTL

Fan out of 2 driving 74L

compatibility

or 1 driving 74LS

Y

4 sum outputs plus parallel look-ahead carry-output

Y

Quiescent current specified to 15V

Y

Maximum input leakage of 1 mA at 15V (full package

temperature range)

Block Diagram

TLF5944 – 1

Truth Table

C0

SUM

000

0

0

100

0

1

010

0

1

110

1

0

001

0

1

101

1

0

011

1

0

111

1

1

Connection Diagram

Dual-In-Line Package

TLF5944 – 2

Top View

Order Number CD4008B

C1995 National Semiconductor Corporation

RRD-B30M105Printed in U S A