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Glossary Term: Tri-State
Definition
An output with three electrical states: One, zero, and "Hi-Z," or "open." The hi-Z state is a high-impedance state in which the output is disconnected, leaving the signal open, to be driven by another device (or to be pulled up or down by a resistor provided to prevent an undefined state).
Commonly used for a bus, in which any several devices can be selected. If the bus has a pull-down resistor, the tri-state arrangement achieves an OR function, dubbed "wired-OR."
Tri-State is a trademark of National Semiconductor.
Synonyms
- wired-OR
- hi-Z
- open collector
- open-drain
See Also
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