Logic OR Gate Tutorial - Easy Electronics

In this article, we are going to learn about the Logic OR Gate definition, OR Gate truth table, the symbol of OR Gate, the Boolean expression of OR Gate, a Timing diagram of OR Gate, and it the last, the IC 7432 datasheet. So let’s start with the definition, of OR Gate.

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Table of Contents

OR Gate

An “OR” gate performs the logical addition on its inputs therefore its output will be high (1) if any one or both the inputs are high (1).

Its output will be low (0) if and only if both the inputs are simultaneously low (0).

Logical Symbol of OR Gate

The below figure shows the logical symbol for two inputs OR Gate.

OR Gate Truth Table

The below figure shows the truth table for two inputs OR Gate.

Note that the output Y is LOW (0) if and only if both the inputs are LOW (0).

if any one or both the inputs are HIGH (1), then the output is HIGH (1).

Boolean Expressions of OR Gate

the boolean expression of an OR Gate is:

$\boxed{\mathbf{Y =\;A+B}}$

By substituting different values of A and B into this expression we can get the corresponding output. This is how we can verify the truth table of a gate.

Multiple Input OR gate

The below figure shows the logical symbol and the truth table for 3-input and 4-input OR gates.

Boolean Expression for 3-input and 4-input OR gate

The Boolean expression for a 3-input OR gate is:

$\boxed{\mathbf{Y =\;A+B+C}}$

The Boolean expression for a 4-input OR gate is:

$\boxed{\mathbf{Y =\;A+B+C+D}}$

Timing Diagram of OR Gate

The Input and output voltage waveform for the pulsed operation of a two OR gate is shown in the figure below.

From the waveform, we conclude that OR gate will obey its truth table for pulsed operation as well.

Standard Package of OR Gate

The OR gate is available in the monolithic integrated circuit form.

IC 7432 is a 14-pin TTL integrated circuit with four, two-input OR gates inside.

The pin configuration of IC 7432 is shown below in the figure.

Download Datasheet for IC 7432 PDF: IC 7432 Datasheet PDF

Frequently Asked Questions on OR Gate

Answer: boolean expression of an OR Gate is: $\boxed{\mathbf{Y=\;A+B}}$

Answer: The function of an OR gate is to find the maximum between the inputs which are binary in nature. It is one of the basic gates used in Boolean algebra and electronic circuits like transistor-transistor logic, and complementary metal-oxide semiconductors make use of it.

Answer:

What is OR gate in physics?

OR gate: The OR gate is defined as a digital logic gate in which if both the inputs are low then the output is also low whereas if both the inputs are high or in fact, if one input is high the output will be high only. Therefore, the input can be two signals or more than two signals.

AND Gate	Click Here
OR Gate	Click Here
NOT Gate	Click Here
NOR Gate	Click Here
XOR Gate	Click Here
XNOR Gate	Click Here
NAND Gate	Click Here

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