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HD74AC283 Datasheet(Fiches technique) 3 Page - Hitachi Semiconductor

Numéro de pièce HD74AC283
Description  4-bit Binary Full Adder with Fast Carry
Télécharger  12 Pages
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Fabricant  HITACHI [Hitachi Semiconductor]
Site Internet  http://www.renesas.com/eng
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 3 page
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HD74AC283/HD74ACT283
3
stage. Figure d shows a method of implementing a 5-input encoder, where the inputs are equally weighted.
The outputs S
0, S1 and S2 present a binary number equal to the number of inputs I1 – I5 that are true. Figure
e 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.
Fig. a Active HIGH varsus Active LOW Interpretation
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
HHHL
L
H
Active HIGH
00101
100111001
Active LOW
11010
011000110
Active HIGH: 0 + 10 + 9 = 3 + 16
Active LOW: 1 + 5 + 6 = 12 + 0
C0
C3
L
C4
A0
S0
S1
S2
S3
A1
A2
A3
B1
B2
B3
B0
Fig. b 3-bit Adder
C0
C0
C4
C11
A0
S0
S1
S2
S3
S0
S1
C2
S10
A1
A2
A3
B1
B2
C10
B3
B0
A0
A1
A10
B1
B10
B0
Fig. c 2-bit and 1-bit adders




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