SN54F283, SN74F283

4BIT BINARY FULL ADDERS

WITH FAST CARRY

SDFS069A − D2932, MARCH 1987 − REVISED OCTOBER 1993

Copyright

2−1

POST OFFICE BOX 655303

POST OFFICE BOX 1443

Four Bits

Performance With the Economy of Ripple

Carry

Small-Outline Packages, Ceramic Chip

Carriers, and Standard Plastic and Ceramic

300-mil DIPs

description

The

′F283 is a full adder that performs the addition

of two 4-bit binary words. The sum (

Σ) outputs are

provided for each bit and the resultant carry (C4)

output is obtained from the fourth bit.

The device features full internal look-ahead

across all four bits generating the carry term C4 in

typically 5.7 ns. This capability provides the

system

designer

with

partial

look-ahead

performance at the economy and reduced

package count of a ripple-carry implementation.

The

adder

logic,

including

the

carry,

is

implemented in its true form. End-around carry

can be accomplished without the need for logic or

level inversion.

The

′F283 can be used with either all-active-high

(positive logic) or all-active-low (negative logic)

operands.

The SN54F283 is characterized for operation over

the full military temperature range of − 55

°C to

125

°C. The SN74F283 is characterized for

operation from 0

°C to 70°C.

Σ

0

6

B1

0

5

A1

3

A2

14

A3

3

12

A4

2

B2

15

B3

3

11

B4

CI

7

C0

C4

9

CO

Σ1

4

0

1

13

10

3

Σ2

Σ3

Σ4

P

Q

Σ

† This symbol is in accordance with ANSI/IEEE Std 91-1984 and IEC Publication 617-12.

Pin numbers shown are for the D, J, and N packages.

SN54F283 ...J PACKAGE

SN74F283 ...D OR N PACKAGE

(TOP VIEW)

32

1 20 19

910 11 12 13

4

5

6

7

8

18

17

16

15

14

A3

Σ3

NC

A4

B4

A2

Σ1

NC

A1

B1

SN54F283 . . . FK PACKAGE

(TOP VIEW)

NC − No internal connection

1

2

3

4

5

6

7

8

16

15

14

13

12

11

10

9

Σ2

B2

A2

Σ1

A1

B1

C0

GND

B3

A3

Σ3

A4

B4

Σ4

C4

PRODUCTION DATA information is current as of publication date.

Products conform to specifications per the terms of Texas Instruments

standard warranty. Production processing does not necessarily include

testing of all parameters.