Inverter

Inverter truth table
Input	Output
A	NOT A
0	1
1	0

ANSI NOT gate symbol

In digital electronics, an Inverter otherwise known as a NOT gate is a logic gate which produces the opposite value of the input. A LOW (0) input results in a HIGH (1) output; a HIGH input results in a LOW output.

Logic

A single-input NOT gate can be expressed in Boolean logic as ${\overline {A}}$ or $\neg A$.

Alternatives

If a specific type of gate is not available, a circuit that implements the same function can be constructed from other available gates. Through the use of the "universal" NAND gates and NOR gates, almost any other Boolean logic gate can be constructed.

A NOT gate can be constructed using a single NAND or NOR gate in the following topologies:

See also

• AND gate
• OR gate
• NAND gate
• NOR gate
• XOR gate
• XNOR gate
• IMPLY gate
• NIMPLY gate