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A triangle with a control line entering its flat side.
Also known as: Three-state buffer, Tristate buffer, Bus driver, Triangle with a side input
A tri-state buffer has a third output state — high impedance — in which it is electrically disconnected rather than driving high or low. That state is what lets many devices share one bus wire without fighting each other, and it is the whole reason the component exists.
Denotes a buffer whose output can be placed in a high-impedance state by an enable input.
Contexts: Electrical equipment
Provides a third state that is neither high nor low but disconnected, which is what allows multiple drivers to share a common bus.
Contexts: Electrical equipment
Is drawn as the buffer triangle with a separate control line entering perpendicular to the signal path, often with an inversion bubble on that control.
Contexts: Electrical equipment
A triangle pointing right with a signal line entering its flat left side and a second line entering the middle of one sloping side.