NOT Operation

The NOT operation is a fundamental function in digital electronic circuits, similar to the AND and OR operations. It is also known as the complement function or bit invert function and is denoted by a bar.

The NOT operation accepts one input and one output. It can only accept inputs of either zero or one, and the output will also be either zero or one. In negative logic, the signal values are reversed, where 0 represents a high signal, and 1 represents a low signal. The bit invert function always produces an output of 0 if the input is 1 and an output of 1 if the input is 0.


Their operation is equal to a negative operation and it has a single input and output. The example below explains this operation.

Let’s take the Boolean expression Z = X NOT X. We can express it in Boolean algebra as,


For the 0 and 1 NOT operations, the output can be expressed as:


The NOT operation is an inversion process, as shown in the truth table below. It is read as “ not X is equal to Z.”


When X is 0, Z is 1. When X is 1, Z is 0.

  1. AND Operation
  2. OR Operation

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