Logic sum or union (OR gate)

This logic function is represented as S = A+B = A or B, where a and be are the input variables, has the value 1 when one of the variables or both have value 1.

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A

B

S = A + B

0

0

0

0

1

0

1

1

2

1

0

1

3

1

1

1

The demonstration is that when ...

a)      the current flows when one of the circuits is closed;

b)      corresponds to the representation of the OR gate logic according to DIN norm;

c)       according to norm ASA. The logic OR gates are produced with two, three or four entries.

Producer codes for the integrated circuits for gate OR: 7432.

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