It is an electronic circuit having one or more than one input and only one output is based on certain logic.LOGICAL GATE are AND gate, OR gate, NOT gate, NAND gate, NOR gate, XOR gate, XNOR gate etc.
AND gate
The AND gate is an electronic circuit that gives a high
output (1) only if all its inputs are high. A dot (.) is
used to show the AND operation.
OR gate
The OR gate is an electronic circuit that gives a high output (1) if
one or more of its inputs are high.
NOT gate
The NOT gate is an electronic circuit that produces an inverted version
of the input at its output. It is also known as an inverter.
NAND gate
This is a NOT-AND gate which is equal to an AND gate followed by a NOT
gate. The outputs of all NAND gates are high if any of the
inputs are low. The symbol is an AND gate with a small circle on the output.
The small circle represents inversion.
NOR gate
This is a NOT-OR gate which is equal to an OR gate followed by a NOT
gate. The outputs of all NOR gates are low if any of the
inputs are high.
EX OR gate
- The 'Exclusive-OR' gate is a circuit which will give a high output
if either, but not both, of its two inputs are high. An encircled
plus sign (
) is used to show the EOR operation.
EX NOR gate
he 'Exclusive-NOR' gate circuit does the opposite to the EOR gate. It will give a low output if either, but not both, of its two inputs are high. The symbol is an EXOR gate with a small circle on the output. The small circle represents inversion.
The NAND and NOR gates are called universal functions since with either one the AND and OR functions and NOT can be generated.
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