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54ACT283 Datasheet(Fiches technique) 2 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Numéro de pièce 54ACT283
Description  4-Bit Binary Full Adder with Fast Carry
Télécharger  8 Pages
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
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 2 page
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Functional Description (Continued)
Note that as long as A
2 and B2 are the same, whether HIGH
or LOW, they do not influence S
2. Similarly, when A2 and B2
are the same the carry into the third stage does not influence
the carry out of the third stage.
Figure 4 shows a method of
implementing a 5-input encoder, where the inputs are
equally weighted. The outputs S
0,S1 and S2 present a bi-
nary number equal to the number of inputs I
1–I5 that are
true.
Figure 5 shows one method of implementing a 5-input
majority gate. When three or more of the inputs I
1–I5 are
true, the output M
5 is true.
C
0
A
0
A
1
A
2
A
3
B
0
B
1
B
2
B
3
S
0
S
1
S
2
S
3
C
4
Logic Levels
L
L
H
L
H
H
L
L
H
H
H
L
L
H
Active HIGH
00101100111001
Active LOW
11010011000110
Active HIGH:0+10+9 = 3 + 16
Active LOW:1+5+6 = 12+0
FIGURE 1. Active HIGH versus Active LOW Interpretation
DS100977-5
FIGURE 2. 3-Bit Adder
DS100977-6
FIGURE 3. 2-Bit and 1-Bit Adders
DS100977-7
FIGURE 4. 5-Input Encoder
DS100977-8
FIGURE 5. 5-Input Majority Gate
www.national.com
2




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