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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**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**

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