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Three-state logic - Wikipedia, the free encyclopedia
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See also: Tri-state area, tripoint. In digital electronics three-state', tri-state, or 3-state logic gate allows output ports to have a value of 0, 1, or Z. A Z output stands for the output port being disconnected from the rest of the circuit, putting the output in a high impedance state. The intent of this state is to allow multiple circuits to share the same output line or Computer bus without affecting each other. Tri-state is a registered trademark of National Semiconductor but is often used to describe devices made by any manufacturer.

Three-state outputs are implemented in various families of digital integrated circuits such as the 7400 series of Transistor-transistor logic gates, and often in the data and address bus lines of microprocessors. Three-state outputs may be found on individual logic gates, or in multiples in one integrated circuit package as a buffer for connection to a bus.

This form of gate should not be confused with 3-value logic (ternary logic).

{| class="wikitable" align=right|- " align="center"|colspan=2|INPUT || OUTPUT|- " align="center"| A || B || C|- " align="center"|0 || 0 || Z|- " align="center"|1 || 0 || Z|- " align="center"|0 || 1 || 0|- " align="center"|1|| 1 || 1|}

Uses of three-state logic Three-state buffers can be used to implement efficient multiplexers, especially those with large numbers of inputs.

Three-state logic devices are used to accommodate multiple bus drivers. If the outputs of several tri-state logic are electrically connected together, only one three-state logic device may be active. The other three-state logic devices may be in the high impedance mode and thus will not affect the output of the active three-state logic device.