Elementary Logic Gates are the fundamental
logic gates using which other logic gates are build.
There are three fundamental
logic gates-
- AND Gate
- OR Gate
- NOT Gate
1) AND Gate
AND gate takes two or
more inputs and results into one output. When all the inputs are high i.e. 1
then the output of AND Gate is high (1), and in rest all cases the output will
be low i.e. 0 when any one of the inputs is low (0).
Logical Expression
F=
A.B
Logic Symbol
The logic symbol for AND
Gate is given below:
Truth Table
Here is the truth table of AND
gate:
2) OR Gate
OR gate also takes two or more
inputs and results into one output. When any one of the inputs is high i.e. 1
then the output of OR Gate is high (1), and only in the case when all the
inputs are low i.e. 0, the output will be low (0).
Logic Expression
F
= A.B
Logic Symbol
The logic symbol for OR
Gate is given below:
Truth Table
3) NOT Gate
NOT Gate is also known as
Inverter Gate. In NOT Gate we have only one input and one output. It inverts
the input and gives the output i.e. when input is high (1), the output is low (1)
and when input is low (1), the output is high (1).
Logical Expression
F
= A’
Logic Symbol
The logic symbol for NOT
Gate is given below:
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