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A OR B
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.
There are two symbols for OR gates: the 'military' symbol and the 'rectangular' symbol. For more information see Logic Gate Symbols
Hardware Description and Pinout Edit
As well as the standard 2-Input OR Gate, 3- and 4-Input OR Gates are also available:
- 4075: Triple 3-Input OR Gate
- 4072: Dual 4-Input OR Gate
- 74LS32: Quad 2-input OR gate
If no specific OR gates are available, one can be made from NAND gates in the configuration shown below. Any logic gate can be made from a combination of NAND gates