5-1
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
123456
B
4
7
16 15
8
Σ
4C4C0GND B1A1
Σ
1
A4
Σ
3A3
Σ
2B2A2
CONNECTION DIAGRAM DIP (TOP VIEW)
B3VCC
NOTE:
The Flatpak version has the
same pinouts (Connection
Diagram) as the Dual In-Line
Package.
PIN NAMES LOADING (Note a)
HIGH LOW
A1–A4
B1–B4
C0
Σ1–Σ4
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.
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
9621514
13 14C0
B1A2B2A3B3A4B4
C4
∑
1
∑
2
∑
3
∑
4C4
LOGIC DIAGRAM
VCC = PIN 5
GND = PIN 12
= PIN NUMBERS
C1C2C3
C0A1B1A2B2A3B3A4B4
C4
∑
1
∑
2
∑
3
∑
4
15
3 410 11 161
2
6
7
9
13 8
14
5-2
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+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:
C0A1A2A3A4B1B2B3B4∑1∑2∑3∑4C4
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 af fect the operation, thus C0, A1, B1, can be arbitrarily assigned to pins 10, 11,
13, etc.
FUNCTIONAL TRUTH TABLE
C (n–1) AnBn∑nCn
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
VCC Supply Voltage 54
74 4.5
4.75 5.0
5.0 5.5
5.25 V
TAOperating Ambient Temperature Range 54
74 –55
025
25 125
70 °C
IOH Output Current — High 54, 74 –0.4 mA
IOL Output Current — Low 54
74 4.0
8.0 mA
5-3
FAST AND LS TTL DATA
SN54/74LS83A
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Sbl
P
Limits
Ui
T C di i
Symbol Parameter Min Typ Max Unit Test Conditions
VIH Input HIGH Voltage 2.0 V Guaranteed Input HIGH Voltage for
All Inputs
VIL
Input LOW Voltage
54 0.7
V
Guaranteed Input LOW Voltage for
V
IL
I
npu
t
LOW
V
o
lt
age 74 0.8
V
pg
All Inputs
VIK Input Clamp Diode Voltage –0.65 –1.5 V VCC = MIN, IIN = –18 mA
V
O HIGH V l
54
25
35
V
V MIN I MAX V V
VOH
Output HIGH Voltage
54
2
.
5
3
.
5
V
VCC = MIN, IOH = MAX, VIN = VIH
V
OH
O
u
t
pu
t
HIGH
V
o
lt
age 74 2.7 3.5 V
CC ,OH ,IN IH
per T ruth Table
VOL
Output LOW Voltage
54, 74 0.25 0.4 V IOL = 4.0 mA VCC = VCC MIN,
VIN =V
IL or VIH
V
OL
O
u
t
pu
t
LOW
V
o
lt
age 74 0.35 0.5 V IOL = 8.0 mA
V
IN =
V
IL or
V
IH
per T ruth Table
IIH
Input HIGH Current
C0
A or B 20
40 µA VCC = MAX, VIN = 2.7 V
IIH
C0
A or B 0.1
0.2 mA VCC = MAX, VIN = 7.0 V
IIL Input LOW Current
C0
A or B –0.4
–0.8 mA VCC = MAX, VIN = 0.4 V
IOS Output Short Circuit Current (Note 1) –20 –100 mA VCC = MAX
ICC Power Supply Current
All Inputs Grounded
All Inputs at 4.5 V, Except B
All Inputs at 4.5 V
39
34
34
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)
Sbl
P
Limits
Ui
Symbol Parameter Min Typ Max Unit Test Conditions
tPLH
tPHL Propagation Delay, C0 Input
to any Σ Output 16
15 24
24 ns
tPLH
tPHL Propagation Delay, Any A or
B Input to Σ Outputs 15
15 24
24 ns VCC = 5.0 V
tPLH
tPHL Propagation Delay, C0 Input
to C4 Output 11
15 17
22 ns
L =
p
Figures 1 and 2
tPLH
tPHL Propagation Delay, Any A or
B Input to C4 Output 11
12 17
17 ns
Figure 1 Figure 2
AC WAVEFORMS
VIN
VOUT
1.3 V
tPHL
1.3 V
1.3 V 1.3 V
tPLH
VIN
VOUT
1.3 V
tPLH
1.3 V
1.3 V 1.3 V
tPHL