HD74AC283 Datasheet, PDF(3/12 Page) Hitachi Semiconductor – 4-bit Binary Full Adder with Fast Carry

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HD74AC283 Datasheet, PDF (3/12 Pages) Hitachi Semiconductor – 4-bit Binary Full Adder with Fast Carry

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HD74AC283/HD74ACT283

stage. Figure d shows a method of implementing a 5-input encoder, where the inputs are equally weighted.

The outputs S0, S1 and S2 present a binary number equal to the number of inputs I1 â I5 that are true. Figure

e shows one method of implementing a 5-input majority gate. When three or more of the inputs I1 â I5 are

true, the output M5 is true.

Fig. a Active HIGH varsus Active LOW Interpretation

Logic levels

A3 B0

L L H L HH L L H H H L L H

Active HIGH

0 0 1 0 11 0 0 1 1 1 0 0 1

Active LOW

1 1 0 1 00 1 1 0 0 0 1 1 0

Active HIGH: 0 + 10 + 9 = 3 + 16

Active LOW: 1 + 5 + 6 = 12 + 0

A0 B0 A1 B1 A2 B2 A3 B3

Fig. b 3-bit Adder

A0 B0 A1 B1

C10

A10 B10

A0 B0 A1 B1

A2 B2 A3 B3

C11

S10

Fig. c 2-bit and 1-bit adders

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