Dr. Ahmed G. Abo-Khalil

Electrical Engineering Department

OR gate

The OR gate is a digital logic gate that implements logical disjunction - it behaves according to the truth table to the right. A HIGH output (1) results if one or both the inputs to the gate are HIGH (1). If neither input is HIGH, a LOW output (0) results. In another sense, the function of OR effectively finds the maximum between two binary digits, just as the complementary AND function finds the minimum.

Symbols

There are three symbols for OR gates: the American (ANSI or 'military') symbol and the IEC ('European' or 'rectangular') symbol, as well as the deprecated DIN symbol. For more information see Logic Gate Symbols.

OR ANSI Labelled.svg IEC OR.svg OR DIN.svg
MIL/ANSI Symbol IEC Symbol DIN Symbol

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