NOT gate

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INPUT
A
OUTPUT
NOT A
0 1
1 0

A NOT gate (also often called Inverter) is a logic gate. It takes one input signal. In logic, there are usually two states, 0 and 1. The gate therefore sends 1 as output, if it receives 0 as input. Alternatively it received 1 as input, and sends 0 as output.

Generally, below 0.5V is 0, and 4–5V is 1.

The inverter can be made of a discrete transistor with other components, or several inverters may be packaged in an integrated circuit.

Symbols[change | change source]

There are three symbols for the NOT gate:

NOT ANSI Labelled.svg NOT IEC.svg NOT DIN.svg
MIL/ANSI Symbol IEC Symbol DIN Symbol