5-1
FAST AND LS TTL DATA
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 (A1A4, B1B4) 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 ac-
tive HIGH or active LOW operands (positive or negative logic).
14
13
12
11
10
9
1
2
3
4
5
6
7
16
15
8
VCC
2
B3
A3
3
A4
4
B4
C4
B2
A2
1
A1
B1
C0 GND
CONNECTION DIAGRAM DIP (TOP VIEW)
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
Operand A Inputs
1.0 U.L.
0.5 U.L.
B1B4
Operand B Inputs
1.0 U.L.
0.5 U.L.
C0
Carry Input
0.5 U.L.
0.25 U.L.
1
4
Sum Outputs (Note b)
10 U.L.
5 (2.5) U.L.
C4
Carry Output (Note b)
10 U.L.
5 (2.5) U.L.
NOTES:
a) 1 TTL Unit Load (U.L.) = 40
µ
A 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.
SN54/74LS283
4-BIT BINARY FULL ADDER
WITH FAST CARRY
LOW POWER SCHOTTKY
ORDERING INFORMATION
SN54LSXXXJ
Ceramic
SN74LSXXXN
Plastic
SN74LSXXXD
SOIC
J SUFFIX
CERAMIC
CASE 620-09
N SUFFIX
PLASTIC
CASE 648-08
16
1
16
1
16
1
D SUFFIX
SOIC
CASE 751B-03
LOGIC SYMBOL
5
3 14 12 6 2 15 11
9
7
4
1 13 10
A1 A2 A3 A4 B1 B2 B3 B4
1
2
3
4
VCC = PIN 16
GND = PIN 8
C0
C4
5-2
FAST AND LS TTL DATA
SN54/74LS283
LOGIC DIAGRAM
C0
A1
B1
A2
B2
A3
B3
A4
B4
1
2
3
4
C4
VCC = PIN 16
GND = PIN 8
= PIN NUMBERS
C1
C2
C3
14
1
2
6
7
3
4
5
9
11
12
10
13
15
FUNCTIONAL DESCRIPTION
The LS283 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 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.
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
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 7, 5 or 3.
5-3
FAST AND LS TTL DATA
SN54/74LS283
FUNCTIONAL TRUTH TABLE
C (n 1)
An
Bn
n
Cn
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
TA
Operating Ambient Temperature Range
54
74
55
0
25
25
125
70
°
C
IOH
Output 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)
Symbol
Parameter
Limits
Unit
Test Conditions
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
All Inputs
VIL
Input LOW Voltage
74
0.8
V
Guaranteed Input LOW Voltage for
All Inputs
VIK
Input Clamp Diode Voltage
0.65
1.5
V
VCC = MIN, IIN = 18 mA
VOH
Output HIGH Voltage
54
2.5
3.5
V
VCC = MIN, IOH = MAX, VIN = VIH
or VIL per Truth Table
VOH
Output HIGH Voltage
74
2.7
3.5
V
VCC = MIN, IOH = MAX, VIN = VIH
or VIL per Truth Table
VOL
Output LOW Voltage
54, 74
0.25
0.4
V
IOL = 4.0 mA
VCC = VCC MIN,
VIN = VIL or VIH
per Truth Table
VOL
Output LOW Voltage
74
0.35
0.5
V
IOL = 8.0 mA
VIN = VIL or VIH
per Truth Table
IIH
Input HIGH Current
C0
20
µ
A
VCC = MAX, VIN = 2.7 V
IIH
Input HIGH Current
Any A or B
40
µ
A
VCC = MAX, VIN = 2.7 V
IIH
Input HIGH Current
C0
0.1
mA
VCC = MAX, VIN = 7.0 V
Any A or B
0.2
mA
VCC = MAX, VIN = 7.0 V
IIL
Input LOW Current
C0
0.4
mA
VCC = MAX, VIN = 0.4 V
IIL
Input LOW Current
Any A or B
0.8
mA
VCC = MAX, VIN = 0.4 V
IOS
Short Circuit Current (Note 1)
20
100
mA
VCC = MAX
ICC
Power Supply Current
Total, Output HIGH
34
mA
VCC = MAX
ICC
Total, Output LOW
39
mA
VCC = MAX
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
5-4
FAST AND LS TTL DATA
SN54/74LS283
AC CHARACTERISTICS
(TA = 25
°
C, VCC = 5.0 V)
Symbol
Parameter
Limits
Unit
Test Conditions
Symbol
Parameter
Min
Typ
Max
Unit
Test Conditions
tPLH
tPHL
Propagation Delay, C0 Input
to Any
Output
16
15
24
24
ns
CL = 15 pF
Figures 1 & 2
tPLH
tPHL
Propagation Delay, Any A or B Input
to
Outputs
15
15
24
24
ns
CL = 15 pF
Figures 1 & 2
tPLH
tPHL
Propagation Delay, C0 Input
to C4 Output
11
11
17
22
ns
CL = 15 pF
Figures 1 & 2
tPLH
tPHL
Propagation Delay, Any A or B Input
to C4 Output
11
12
17
17
ns
Figure 1
Figure 2
VIN
VOUT
1.3 V
1.3 V
1.3 V
1.3 V
VIN
VOUT
tPHL
tPLH
tPLH
tPHL
AC WAVEFORMS
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