NOT Gate (Inverter)
A NOT gate, often called an inverter, is a nice digital logic gate to start with because it has only a single input with simple behavior. A NOT gate performs logical negation on its input. In other words, if the input is true, then the output will be false. Similarly, a false input results in a true output.
The truth table for a NOT gate appears to the right.
Each of the symbols below can be used to represent a NOT gate. There are multiple international standards defined, and one may preferred over the other in your region of the world.
|ASNI / IEEE||IEC|
Try the following interactive example to see for yourself how a NOT gate behaves.
To learn more, check out the following external resources:
Inverter (logic gate) on Wikipedia
The NOT gate on All About Circuits
Basic Logical Functions and Gates at Play-Hookey