Document
SN74LS283
4−Bit Binary Full Adder with Fast Carry
The SN74LS283 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 LS283 operates with either active HIGH or active LOW operands (positive or negative logic).
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min Typ Max Unit
VCC
Supply Voltage
TA
Operating Ambient
Temperature Range
4.75 5.0 5.25
V
0
25
70
°C
IOH
Output Current − High
IOL
Output Current − Low
−0.4 mA
8.0
mA
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LOW POWER SCHOTTKY
16 1 PLASTIC N SUFFIX CASE 648
16 1
SOIC D SUFFIX CASE 751B
© Semiconductor Components Industries, LLC, 2006
July, 2006 − Rev. 8
16 1
SOEIAJ M SUFFIX CASE 966
ORDERING INFORMATION
Device
Package
Shipping
SN74LS283N
16 Pin DIP 2000 Units/Box
SN74LS283D
SOIC−16
38 Units/Rail
SN74LS283DR2 SOIC−16 2500/Tape & Reel
SN74LS283M
SOEIAJ−16 See Note 1
SN74LS283MEL SOEIAJ−16 See Note 1
1. For ordering information on the EIAJ version of the SOIC package, please contact your local ON Semiconductor representative.
1
Publication Order Number:
SN74LS283/D
SN74LS283
CONNECTION DIAGRAM DIP (TOP VIEW) VCC B3 A3 Σ3 A4 B4 Σ4 C4 16 15 14 13 12 11 10 9
NOTE: The Flatpak version has the same pinouts (Connection Diagram) as the Dual In-Line Package.
1 2 3 4 56 78 Σ2 B2 A2 Σ1 A1 B1 C0 GND
PIN NAMES
A1 − A4 B1 − B4 C0 S1 − S4 C4
Operand A Inputs Operand B Inputs Carry Input Sum Outputs Carry Output
LOADING (Note a)
HIGH
LOW
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 U.L. 5 U.L.
NOTES: a) 1 TTL Unit Load (U.L.) = 40 mA HIGH/1.6 mA LOW.
LOGIC SYMBOL
5 3 14 12 6 2 15 11
A1 A2 A3 A4 B1 B2 B3 B4
7 C0
C4
9
∑1 ∑2 ∑3 ∑4
4 1 13 10
VCC = PIN 16 GND = PIN 8
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C0 A1
7
5
B1
6
A2
3
B2
2
SN74LS283
LOGIC DIAGRAM
A3
14
B3
15
A4
12
B4
11
C1
C2
C3
4
VCC = PIN 16 GND = PIN 8
∑1
= PIN NUMBERS
1 ∑2
13 ∑3
10 ∑4
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
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:
logic levels Active HIGH Active LOW
C0 A1 A2 A3 A4 B1 B2 B3 B4 ∑1 ∑2 ∑3 ∑4 C4 L LHL HHL LHHH L LH 0010 11001 1 1 0 01 1101 00110 0 0 1 10
(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.
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SN74LS283
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
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol VIH
Parameter Input HIGH Voltage
Min Typ Max Unit
Test Conditions
2.0
V
Guaranteed Input HIGH Voltage for All Inputs
VIL
Input LOW Voltage
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
2.7
3.5
V
VCC = MIN, IOH = MAX, VIN = VIH or VIL per Truth Table
VOL
Output LOW Voltage
0.25 0.4 0.35 0.5
V
IOL = 4.0 mA
V
IOL = 8.0 mA
VCC = VCC MIN, VIN = VIL or VIH per Truth Table
C0
Any A or B
IIH
Input HIGH Current
C0
Any A or B
20
μA
40
μA
VCC = MAX, VIN = 2.7 V
0.1
mA
VCC = MAX, VIN = 7.0 V
0.2
mA
C0
IIL
Input LOW Current
Any A or B
−0.4 mA VCC = MAX, VIN = 0.4 V
−0.8 mA
IOS
Short Circuit Current (Note 1)
− 20
−100 mA
Power Supply Current
ICC
Total, Output HIGH
Total, Output LOW
34
mA
39
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
VCC = MAX VCC = MAX
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SN74LS283
AC CHARACTERISTICS (TA = 25°C, VCC = 5.0 V)
Limits
Symbol
Parameter
Min Typ Max Unit
tPLH
Propagation Delay, C0 Input
tPHL
to Any Σ Output
16 15
24 24
ns
tPLH
Propagation Delay, Any A or B Input
tPHL
to Σ Outputs
15 15
24 24
ns
tPLH
Propagation Delay, C0 Input
tPHL
to C4 Output
11 11
17 22
ns
tPLH
Propagation Delay, Any A or B Input
tPHL
to C4 Output
11 12
17 17
ns
Test Conditions
CL = 15 pF Figures 1 & 2
VIN VOUT
1.3 V tPHL
1.3 V
Figure 1.
AC WAVEFORMS
VIN
1.3 V
tPLH
tPLH
tPHL.