Motorola SN54LS83AJ, SN74LS83AD, SN74LS83AN Datasheet
5-81
FAST AND LS TTL DATA
4-BIT BINARY FULL ADDER
WITH FAST CARRY
The SN54/74LS83A 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 LS83A operates with either
active HIGH or active LOW operands (positive or negative logic). The
SN54/74LS283 is recommended for new designs since it is identical in
function with this device and features standard corner power pins.
14 13 12 11 10 9
1 2 3 4 5 6
B
4
7
16 15
8
Σ
4C4C0
GND B1A
1Σ1
A
4
Σ
3A3
Σ
2B2A2
CONNECTION DIAGRAM DIP (TOP VIEW)
B3V
CC
NOTE:
The Flatpak version has the
same pinouts (Connection
Diagram) as the Dual In-Line
Package.
PIN NAMES LOADING (Note a)
HIGH
LOW
A1–A
4
B1–B
4
C
0
Σ1–Σ
4
C
4
Operand A Inputs
Operand B Inputs
Carry Input
Sum Outputs (Note b)
Carry Output (Note b)
1.0 U.L.
1.0 U.L.
0.5 U.L.
10 U.L.
10 U.L.
0.5 U.L.
0.5 U.L.
0.25 U.L.
5 (2.5) U.L.
5 (2.5) U.L.
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.
SN54/74LS83A
4-BIT BINARY FULL ADDER
WITH FAST CARRY
LOW POWER SCHOTTKY
J SUFFIX
CERAMIC
CASE 620-09
N SUFFIX
PLASTIC
CASE 648-08
16
1
16
1
ORDERING INFORMATION
SN54LSXXJ Ceramic
SN74LSXXN Plastic
SN74LSXXD SOIC
16
1
D SUFFIX
SOIC
CASE 751B-03
LOGIC SYMBOL
10 11 8 7 3 4 1 16
9 6 2 15 14
13 14C
0
B1A2B2A3B3A4B
4
C
4
∑1∑2∑3∑
4C4
LOGIC DIAGRAM
VCC = PIN 5
GND = PIN 12
= PIN NUMBERS
C
1
C
2
C
3
C0A1B
1
A2B
2
A3B
3
A4B
4
C
4
∑
1
∑
2
∑
3
∑
4
15
3 410 11 161
2
6
7
9
13 8
14
5-82
FAST AND LS TTL DATA
SN54/74LS83A
FUNCTIONAL DESCRIPTION
The LS83A adds two 4-bit binary words (A plus B) plus the incoming carry . The binary sum appears on the sum outputs (∑1–∑4)
and outgoing carry (C4) outputs.
C0 + (A1+B1)+2(A2+B2)+4(A3+B3)+8(A4+B4) = ∑1+2∑2+4∑3+8∑4+16C
4
Where: (+) = plus
Due to the symmetry of the binary add function the LS83A 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.
Example:
C0A1A2A3A4B1B2B3B4∑1∑2∑3∑
4
C
4
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 0 1 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 10, 1 1,
13, etc.
FUNCTIONAL TRUTH TABLE
C (n–1) A
n
B
n
∑
n
C
n
L L L L L
L L H H L
L H L H L
L H H L H
H L L H L
H L H L H
H H L L H
H H 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
V
CC
Supply Voltage 54
74
4.5
4.75
5.0
5.0
5.5
5.25
V
T
A
Operating Ambient Temperature Range 54
74
–55
0
25
25
125
70
°C
I
OH
Output Current — High 54, 74 –0.4 mA
I
OL
Output Current — Low 54
74
4.0
8.0
mA
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