The NOR gate is also a universal gate. So, we can also form all the basic gates using the NOR gate. The NOR gate is the combination of the NOT-OR gate. The output state of the NOR gate will be high only when all of the inputs are low. Simply, this gate returns the complement result of the OR gate.
The logical or Boolean expression for the NOR gate is the complement of logical multiplication of inputs denoted by the plus sign as
(A+B)'=Y
The value of Y will be true when all of its inputs are set to 0.
The NOR gate is also classified into three types based on the input it takes. These are the following types of NOR gate:
The 2-input NOR gate
Logic Design
Truth Table
The 3-input NOR gate
Logic Design
Truth Table
Just like the NAND gate, we can also form the n-input NOR gate. If the number of inputs required is odd, any "unused" input can be held low by directly connecting it to the power supply using low "suitable" pull-up resistors. There is the following expression of the 4-input NOR gate:
Y=((A+B)+(C+D))'
In simple words, it is expressed as:
Y=A NOR B NOR C NOR D
Logic Design
Truth Table
AND gate using NOR gate
OR gate using NOR gate
NOT gate using NOR gate
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