A table which will help to understand behavior of logic gates is known as _______.

Question

Question

This question was previously asked in

RRB ALP Electronics Mechanic 23 Jan 2019 Official Paper (Shift 3)

Answer 1

A table which will help to understand behavior of logic gates is known as truth table.

Concept:

Logic gate: The digital circuit that can be analyzed with the help of Boolean algebra is called a logic gate or logic circuit.
A logic gate has two or more inputs but only one output.
Logic gates work on the truth table.

Additional Information

For Example,

AND Gate: The Logic AND Gate is a digital logic circuit whose output HIGH only when all the inputs are 1 (HIGH) otherwise output will be LOW.

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OR Gate: The Logic OR Gate is a digital logic circuit whose output goes HIGH only when any one or more than one of its inputs is HIGH.

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NOT Gate: The Logic NOT Gate is the most basic of all the logic gates and is often referred to as an Inverting Buffer or simply an Inverter.

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\(Y = \bar A\)

A	B
0	1
1	0

NAND Gate: The logic Gate is obtained after adding NOT Gate after AND Gate.

\(Y = \overline {\left( {A \cdot B} \right)} \)

NOR Gate: The logic Gate is obtained after adding NOT Gate after OR Gate.

\(Y = \overline {\left( {A + B} \right)} \)

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XOR Gate: output goes HIGH to a logic level 1 only when both of its inputs are different. If inputs are the same, the output will be LOW '0'.

\(Y = A \cdot \bar B + \bar A \cdot B\)

Truth Table of XOR Gate:

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