MOTOROLA SN74LS283D, SN74LS283DR2, SN74LS283MEL, SN74LS283ML1, SN74LS283ML2 Datasheet
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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 |
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VCC |
Supply Voltage |
4.75 |
5.0 |
5.25 |
V |
TA |
Operating Ambient |
0 |
25 |
70 |
°C |
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Temperature Range |
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IOH |
Output Current ± High |
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± 0.4 |
mA |
IOL |
Output Current ± Low |
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8.0 |
mA |
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LOW
POWER
SCHOTTKY
16
1
PLASTIC
N SUFFIX
CASE 648
16
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SOIC
D SUFFIX
CASE 751B
ORDERING INFORMATION
Device |
Package |
Shipping |
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SN74LS283N |
16 Pin DIP |
2000 Units/Box |
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SN74LS283D |
16 Pin |
2500/Tape & Reel |
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Semiconductor Components Industries, LLC, 1999 |
1 |
Publication Order Number: |
December, 1999 ± Rev. 6 |
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SN74LS283/D |
SN74LS283
CONNECTION DIAGRAM DIP (TOP VIEW)
VCC |
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B3 |
A3 |
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Σ3 |
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A4 |
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B4 |
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Σ4 |
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C4 |
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16 |
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15 |
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14 |
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13 |
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12 |
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11 |
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10 |
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9 |
NOTE:
The Flatpak version has the same pinouts (Connection Diagram) as the Dual In-Line Package.
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4 |
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5 |
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6 |
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7 |
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8 |
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Σ2 |
B2 |
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A2 |
Σ1 |
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A1 |
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B1 |
C0 |
GND |
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LOADING (Note a) |
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PIN NAMES |
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HIGH |
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LOW |
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A1 ± A4 |
Operand A Inputs |
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1.0 |
U.L. |
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0.5 |
U.L. |
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B1 ± B4 |
Operand B Inputs |
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1.0 |
U.L. |
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0.5 |
U.L. |
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C0 |
Carry Input |
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0.5 |
U.L. |
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0.25 U.L. |
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S1 ± S4 |
Sum Outputs |
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10 U.L. |
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5 U.L. |
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C4 |
Carry Output |
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10 U.L. |
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5 U.L. |
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NOTES:
a) 1 TTL Unit Load (U.L.) = 40 mA HIGH/1.6 mA LOW.
LOGIC SYMBOL
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5 |
3 |
14 |
12 |
6 |
2 |
15 |
11 |
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A1 A2 A3 A4 |
B1 B2 B3 B4 |
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7 |
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C0 |
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∑ 1 |
∑ 2 |
∑ 3 ∑ 4 |
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C4 |
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9 |
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4 |
1 |
13 |
10 |
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VCC = PIN 16 |
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GND = PIN 8 |
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2
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SN74LS283 |
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LOGIC DIAGRAM |
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C0 |
A1 |
B1 |
A2 |
B2 |
A3 |
B3 |
A4 |
B4 |
7 |
5 |
6 |
3 |
2 |
14 |
15 |
12 |
11 |
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C1 |
C2 |
C3 |
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4 |
1 |
13 |
10 |
9 |
VCC = PIN 16 |
∑ 1 |
∑ 2 |
∑ 3 |
∑ 4 |
C4 |
GND = PIN 8 |
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= PIN NUMBERS
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:
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C0 |
A1 |
A2 |
A3 |
A4 |
B1 |
B2 |
B3 |
B4 |
∑ 1 |
∑ 2 |
∑ 3 |
∑ 4 |
C4 |
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logic levels |
L |
L |
H |
L |
H |
H |
L |
L |
H |
H |
H |
L |
L |
H |
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Active HIGH |
0 |
0 |
1 |
0 |
1 |
1 |
0 |
0 |
1 |
1 |
1 |
0 |
0 |
1 |
(10+9=19) |
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Active LOW |
1 |
1 |
0 |
1 |
0 |
0 |
1 |
1 |
0 |
0 |
0 |
1 |
1 |
0 |
(carry+5+6=12) |
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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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