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, 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 LS283 operates with either ac-
tive 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
Σ
3
13
A4
12
B4
11
Σ
4
10
C4
9
NOTE:
The Flatpak version
has the same pinouts
(Connection Diagram) as
the Dual In-Line Package.
16
1
J SUFFIX
CERAMIC
CASE 620-09
1
Σ
2
2
B2
3
A2
4
Σ
1
5
A1
6
B1
7
C0
8
GND
16
1
N SUFFIX
PLASTIC
CASE 648-08
PIN NAMES
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
D SUFFIX
SOIC
CASE 751B-03
A1 – A4
B1–B4
C0
∑
1 –
∑
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.
ORDERING INFORMATION
SN54LSXXXJ
SN74LSXXXN
SN74LSXXXD
Ceramic
Plastic
SOIC
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.
LOGIC SYMBOL
5
3 14 12 6 2 15 11
A1 A2 A3 A4 B1 B2 B3 B4
7
C0
∑
1
∑
2
∑
3
∑
4
4
1 13 10
C4
9
VCC = PIN 16
GND = PIN 8
FAST AND LS TTL DATA
5-1
SN54/74LS283
LOGIC DIAGRAM
C0
7
A1
5
B1
6
A2
3
B2
2
A3
14
B3
15
A4
12
B4
11
C1
C2
C3
4
∑
1
VCC = PIN 16
GND = PIN 8
= PIN NUMBERS
∑
2
1
∑
3
13
∑
4
10
9
C4
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
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
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.
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 7, 5 or 3.
FAST AND LS TTL DATA
5-2
SN54/74LS283
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
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
C0
Any A or B
IIH
Input HIGH Current
C0
Any A or B
IIL
IOS
ICC
Input LOW Current
C0
Any A or B
Short Circuit Current (Note 1)
Power Supply Current
Total, Output HIGH
Total, Output LOW
– 20
0.1
0.2
– 0.4
– 0.8
– 100
34
39
0.35
0.5
20
40
V
µA
µA
mA
mA
mA
mA
mA
VCC = MAX, VIN = 0.4 V
VCC = MAX
VCC = MAX
VCC = MAX, VIN = 7.0 V
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
or VIL per Truth Table
IOL = 4.0 mA
IOL = 8.0 mA
VCC = VCC MIN,
VIN = VIL or VIH
per Truth Table
VCC = MAX, VIN = 2.7 V
mA
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
FAST AND LS TTL DATA
5-3
SN54/74LS283
AC CHARACTERISTICS
(TA = 25°C, VCC = 5.0 V)
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
11
11
12
Max
24
24
24
24
17
22
17
17
Unit
ns
ns
CL = 15 pF
Figures 1 & 2
ns
ns
Test Conditions
AC WAVEFORMS
1.3 V
tPLH
1.3 V
VOUT
tPHL
VIN
VOUT
1.3 V
tPHL
1.3 V
tPLH
VIN
Figure 1
Figure 2
FAST AND LS TTL DATA
5-4
嵌入式系统
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