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Tri-State Gate Truth Table
| In | Enable | X |
|---|---|---|
| 0 | 0 | ? |
| 0 | 1 | 0 |
| 1 | 0 | ? |
| 1 | 1 | 1 |
The tri-state device has a special input labelled Enable. When Enable is equal to 1, the device behaves normally and its output is the same as the input. When Enable is equal to zero, the output is physically disconnected from the gate's internal circuitry. This state is normally called floating.
See Also
Tri-State Buffer — full device description