SN54/74LS83A
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, B 1 – 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.
CONNECTION DIAGRAM DIP
(TOP VIEW)
B4
16
Σ
4
15
C4
14
C0
13
GND
12
B1
11
A1
10
Σ
1
9
NOTE:
The Flatpak version has the
same pinouts (Connection
Diagram) as the Dual In-Line
Package.
4-BIT BINARY FULL ADDER
WITH FAST CARRY
LOW POWER SCHOTTKY
J SUFFIX
CERAMIC
CASE 620-09
16
1
1
A4
2
Σ
3
3
A3
4
B3
5
VCC
6
Σ
2
7
B2
8
A2
LOADING
(Note a)
HIGH
LOW
0.5 U.L.
0.5 U.L.
0.25 U.L.
5 (2.5) U.L.
5 (2.5) U.L.
16
1
PIN NAMES
N SUFFIX
PLASTIC
CASE 648-08
A1 – A4
B1 – B4
C0
Σ
1 –
Σ
4
C4
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.
16
1
D SUFFIX
SOIC
CASE 751B-03
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.
ORDERING INFORMATION
SN54LSXXJ
SN74LSXXN
SN74LSXXD
Ceramic
Plastic
SOIC
LOGIC DIAGRAM
C0 A1
13
10
B1
11
A2
8
B2
7
A3
3
B3
4
A4
1
B4
16
VCC = PIN 5
GND = PIN 12
= PIN NUMBERS
LOGIC SYMBOL
10 11 8 7 3 4 1 16
B1 A2 B2 A3 B3 A4 B4
C0
C4
∑
1
∑
2
∑
3
∑
4 C4
9 6 2 15 14
13
14
C1
C2
C3
9
6
2
15
14
∑
1
∑
2
∑
3
∑
4
C4
FAST AND LS TTL DATA
5-81
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+16C4
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:
C0
Logic Levels
Active HIGH
Active LOW
L
0
1
A1
L
0
1
A2
H
1
0
A3
L
0
1
A4
H
1
0
B1
H
1
0
B2
L
0
1
B3
L
0
1
B4
H
1
0
∑
1
H
1
0
∑
2
H
1
0
∑
3
L
0
1
∑
4
L
0
1
C4
H
1
0
(10+9 = 19)
(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, 11,
13, etc.
FUNCTIONAL TRUTH TABLE
C (n–1)
L
L
L
L
H
H
H
H
An
L
L
H
H
L
L
H
H
Bn
L
H
L
H
L
H
L
H
∑
n
L
H
H
L
H
L
L
H
Cn
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
VCC
TA
IOH
IOL
Supply Voltage
Operating Ambient Temperature Range
Output Current — High
Output Current — Low
Parameter
54
74
54
74
54, 74
54
74
Min
4.5
4.75
– 55
0
Typ
5.0
5.0
25
25
Max
5.5
5.25
125
70
– 0.4
4.0
8.0
Unit
V
°C
mA
mA
FAST AND LS TTL DATA
5-82
SN54/74LS83A
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE
(unless otherwise specified)
Limits
Symbol
VIH
VIL
VIK
VOH
Parameter
Input HIGH Voltage
54
Input LOW Voltage
74
Input Clamp Diode Voltage
54
Output HIGH Voltage
74
54, 74
VOL
Output LOW Voltage
74
Input HIGH Current
C0
A or B
C0
A or B
IIL
IOS
ICC
Input LOW Current
C0
A or B
Output Short Circuit Current (Note 1)
Power Supply Current
All Inputs Grounded
All Inputs at 4.5 V, Except B
All Inputs at 4.5 V
– 20
0.35
0.5
V
µA
2.7
3.5
0.25
0.4
V
V
2.5
– 0.65
3.5
0.8
– 1.5
V
V
Min
2.0
0.7
V
Typ
Max
Unit
V
Test Conditions
Guaranteed Input HIGH Voltage for
All Inputs
Guaranteed Input LOW Voltage for
All Inputs
VCC = MIN, IIN = – 18 mA
VCC = MIN, IOH = MAX, VIN = VIH
per Truth Table
IOL = 4.0 mA
IOL = 8.0 mA
VCC = VCC MIN,
VIN = VIL or VIH
per Truth Table
IIH
20
40
0.1
0.2
– 0.4
– 0.8
–100
39
34
34
VCC = MAX, VIN = 2.7 V
mA
VCC = MAX, VIN = 7.0 V
mA
mA
VCC = MAX, VIN = 0.4 V
VCC = MAX
mA
VCC = MAX
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
AC CHARACTERISTICS
(TA = 25°C)
Limits
Symbol
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
tPLH
tPHL
Parameter
Propagation Delay, C0 Input
to any
Σ
Output
Propagation Delay, Any A or
B Input to
Σ
Outputs
Propagation Delay, C0 Input
to C4 Output
Propagation Delay, Any A or
B Input to C4 Output
Min
Typ
16
15
15
15
11
15
11
12
Max
24
24
24
24
17
22
17
17
Unit
ns
ns
ns
ns
VCC = 5.0 V
CL = 15 pF
Figures 1 and 2
Test Conditions
AC WAVEFORMS
VIN
1.3 V
tPHL
1.3 V
tPLH
1.3 V
VIN
1.3 V
tPLH
1.3 V
tPHL
1.3 V
VOUT
1.3 V
VOUT
1.3 V
Figure 1
Figure 2
FAST AND LS TTL DATA
5-83
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