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SN54LS283 Datasheet(Fiches technique) 2 Page - Motorola, Inc

Numéro de pièce SN54LS283
Description  4-BIT BINARY FULL ADDER WITH FAST CARRY
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Fabricant  MOTOROLA [Motorola, Inc]
Site Internet  http://www.freescale.com
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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.




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