SN74LS283 查看數據表（PDF） - Motorola => Freescale
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SN74LS283 Datasheet PDF : 4 Pages
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LOGIC DIAGRAM
C0 A1
7
5
B1
6
A2
B2
3
2
SN54 / 74LS283
A3
14
B3
15
A4 B4
12
11
C1
C2
C3
4
1
13
VCC = PIN 16
∑1
∑2
∑3
GND = PIN 8
= PIN NUMBERS
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.
FAST AND LS TTL DATA
5-2
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