and/or at higher speeds. In addition to the standard 2-input OR gate, 3- and 4-input OR gates are also available. In the CMOS series, these are: 4075: triple 3-input OR gate 4072: dual 4-input OR gate Variations include: 74LS32: quad 2-input OR gate (low power Schottky version) 74HC32: quad 2-input OR gate (high speed CMOS version) - has lower current consumption/wider voltage range 74AC32: quad 2-input OR gate (advanced CMOS version) - similar to 74HC32, but with significantly faster switching speeds and stronger drive 74LVC32: low voltage CMOS version of the same. Implementations Analytical representation is the analytical representation of OR gate: Alternatives If no specific OR gates are available, one can be made from NAND or NOR gates in the configuration shown in the image below. Any logic gate can be made from a combination of NAND or NOR gates. Wired-OR With active low open collector logic outputs, as used for control signals in many circuits, an OR function can be produced by wiring together several outputs. This arrangement is called a wired OR. This implementation of an OR function typically is also found in integrated circuits of N or P-type only transistor processes. See also AND gate NOT gate NAND gate NOR gate XOR gate XNOR gate Boolean algebra Logic gate References Logic gates Boolean algebra Digital electronics