Sumador 74ls283

SN54/74LS283
4-BIT BINARY FULL ADDER
WITH FAST CARRY
The SN54 / 74LS283 is a high-speed 4-Bit Binary Full Adder with internal
carry lookahead. It accepts two 4-bit binary words (A1 – A4, B1 – B4) and a
Carry Input (C0). It generates the binary Sum outputs (∑1 – ∑4) and the Carry
Output (C4) from the most significant bit. The LS283 operates with either active HIGH or active LOW operands(positive or negative logic).

4-BIT BINARY FULL ADDER
WITH FAST CARRY
LOW POWER SCHOTTKY

CONNECTION DIAGRAM DIP (TOP VIEW)
VCC
16

B3
15

A3
14

Σ3
13

A4
12

B4
11

Σ4
10

C4
9

J SUFFIX
CERAMIC
CASE 620-09
16

NOTE:
The Flatpak version
has the same pinouts
(Connection Diagram) as
the Dual In-Line Package.

1
Σ2

2
B2

3
A2

4
Σ1

5
A1

PINNAMES

6
B1

7
C0

Operand A Inputs
Operand B Inputs
Carry Input
Sum Outputs (Note b)
Carry Output (Note b)

N SUFFIX
PLASTIC
CASE 648-08

16

8
GND

1

1

LOW

1.0 U.L.
1.0 U.L.
0.5 U.L.
10 U.L.
10 U.L.

D SUFFIX
SOIC
CASE 751B-03

16

LOADING (Note a)
HIGH

A1 – A4
B1–B4
C0
∑1 – ∑4
C4

1

0.5 U.L.
0.5 U.L.
0.25 U.L.
5 (2.5) U.L.
5 (2.5) U.L.ORDERING INFORMATION
SN54LSXXXJ
SN74LSXXXN
SN74LSXXXD

NOTES:
a) 1 TTL Unit Load (U.L.) = 40 µA HIGH/1.6 mA LOW.
b) The Output LOW drive factor is 2.5 U.L. for Military (54) and 5 U.L. for Commercial
(74) Temperature Ranges.

Ceramic
Plastic
SOIC

LOGIC SYMBOL
5

3 14 12 6 2 15 11

A1 A2 A3 A4 B1 B2 B3 B4
7

C0

C4
∑1 ∑2 ∑3 ∑4
4

1 13 10

VCC = PIN 16
GND = PIN 8FAST AND LS TTL DATA
5-1

9

SN54/74LS283
LOGIC DIAGRAM
C0

A1
7

B1

A2
6

5

B2

A3
2

3

C1

4
∑1
VCC = PIN 16
GND = PIN 8
= PIN NUMBERS

B3
14

A4

C2

∑2

11

C3

10

13

1

B4
12

15

∑3

9

∑4

FUNCTIONAL DESCRIPTION
The LS283 adds two 4-bit binary words (A plus B) plus the
incoming carry. The binary sum appears on thesum outputs
(∑1 – ∑4) and outgoing carry (C4) outputs.

C4

Due to the symmetry of the binary add function the LS283
can be used with either all inputs and outputs active HIGH
(positive logic) or with all inputs and outputs active LOW
(negative logic). Note that with active HIGH inputs, Carry Input
can not be left open, but must be held LOW when no carry in is
intended.

C0 + (A1 + B1)+ 2(A2 + B2) + 4(A3 + B3) + 8(A4 + B4) = ∑1 + 2 ∑2
+ 4 ∑3 + 8 ∑4 + 16C4
Where: (+) = plus
Example:
C0

A1

A2

A3

A4

B1

B2

B3

B4

∑1

∑2

∑3

∑4

C4

logic levels

L

L

H

L

H

H

L

L

H

H

H

L

L

H

Active HIGH

0

0

1

0

1

1

0

0

1

1

1

0

0

1

(10+9=19)

Active LOW

1

1

01

0

0

1

1

0

0

0

1

1

0

(carry+5+6=12)

Interchanging inputs of equal weight does not affect the operation, thus C0, A1, B1, can be arbitrarily assigned to pins 7, 5 or 3.

FAST AND LS TTL DATA
5-2

SN54/74LS283
FUNCTIONAL TRUTH TABLE
C (n – 1)

An

Bn

∑n

Cn

L
L
L
L
H
H
H
H

L
L
H
H
L
L
H
H

L
H
L
H
L
H
L
H

L
H
HL
H
L
L
H

L
L
L
H
L
H
H
H

C1 – C3 are generated internally
C0 is an external input
C4 is an output generated internally

GUARANTEED OPERATING RANGES
Symbol

Parameter

Min

Typ

Max

Unit

VCC

Supply Voltage

54
74

4.5
4.75

5.0
5.0

5.5
5.25

V

TA

Operating Ambient Temperature Range

54
74

– 55
0

25
25

125
70

°C

IOHOutput Current — High

54, 74

– 0.4

mA

IOL

Output Current — Low

54
74

4.0
8.0

mA

DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol
S bl

Min

Parameter
P

Typ

Max

Unit
Ui

Test C di i
T
Conditions

Input HIGH Voltage

VIL

2.0

Input Clamp Diode Voltage

VOH

Guaranteed Input LOW Voltage...