Page 1083 - Basic Electrical Engineering

Note the difference between an OR gate and EXOR gate. In an OR gate.
The output is 1 when any one of the inputs is 1 or both the inputs are 1. In an
EXOR gate the output is 1 when any one of its inputs is 1. If both the inputs

are 1 the output is 0. That is why an OR gate as such is also called an
inclusive OR gate whereas EXOR gate is an exclusive OR gate.

EX-NOR gate

The operation of an EX-NOR gate is just opposite to the operation of an EX
OR gate. Inputs are two or more and output is one. The output will be high

for similar types of inputs only. The symbol and truth table have been shown.

Thus, we have seen seven types of gates. Three basic gates are NOT, OR,

and AND gates and the combinational gates are NAND, NOR, EXOR and
EX-NOR gates.

NAND and NOR gates are called the universal gates as all other gates can
be created from a suitable network of just NAND or just NOR gates.
A logic gate performs a logical operation on one or more logic inputs and

produces a single logic output. Logic gates are primarily implemented using
resistors, diodes, and transistors.

16.7 DE MORGAN’S THEOREM