Exit in three states

Principle

An exit in three states (or three-state output) is a type of exit of a circuit in digital electronics which in addition to having the valid exits 0 and 1 (L or H) adds an exit of high impedance in the case of (noted Z) a nonvalid exit. One can regard this exit as nor being connected (directly or indirectly) to the mass or the source of tension, indicating a state ambiguous of non-validity in the exit.

Operation

Here the symbol of a AOP in three states

Truth table:

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