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OR Gate | Digital Circuits - Electronics and Communication Engineering (ECE) PDF Download
| Table of contents |
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| Types of Digital Logic AND Gate |
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| The 2-input OR Gate |
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| The 3-input OR Gate |
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| The Multi-input OR Gate |
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The OR gate is a mostly used digital logic circuit. The output state of the OR gate will always be low when both of the inputs states is low. Simply, if any input value in the OR gate is set to 1, then it will always return high-level output(1).
The logic or Boolean expression for the OR gate is the logical addition of inputs denoted by plus sign(+) as A + B = Y
The value of Y will be true when one of the inputs is set to true.
Types of Digital Logic AND Gate
Just like AND gate, the OR gate is also classified into three types based on the input it takes. These are the following types of OR gate:
The 2-input OR Gate
This is the simple form of the OR gate. In this type of OR gate, there are only two input values and an output value. There are 22=4 possible combinations of inputs. The truth table and logic design are given below:
Logic Design
Truth Table
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Test: Realization of Logic Gates
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The 3-input OR Gate
Just like AND gate, the OR gate can also have any number of individual inputs. The Boolean expression of the logical OR gate is defined as the binary operation plus(+). Like AND gate, OR gate can also be cascaded together to form any number of individual inputs. There are 23=8 possible combinations of inputs. The truth table and logic design are given below:
Logic Design
Truth Table
The Multi-input OR Gate
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The n-input OR gate can also be formed. If there are n inputs, then (N/2)+1 OR gates will be used.
For example:
If we have 6 inputs A, B, C. D, E, F, then 4 OR gates are used in the logic design of the 6-input OR gate. There is the following expression of the 6-input OR gate:
Y=(A+B)+(C+D)+(E+F)
In simple words, it is expressed as:
Y=A OR B OR C OR D OR E OR F
Logic Design
Truth Table
The document OR Gate | Digital Circuits - Electronics and Communication Engineering (ECE) is a part of the Electronics and Communication Engineering (ECE) Course Digital Circuits.
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FAQs on OR Gate - Digital Circuits - Electronics and Communication Engineering (ECE)
| 1. What is an OR gate in digital electronics? |  |
| 2. How does an OR gate work? | |
Ans. An OR gate works by evaluating the logical OR operation on its input signals. It has two or more input terminals, and the output is determined based on the logical OR of these inputs. If any of the input signals is true (or high), the output of the OR gate becomes true. Only when all the input signals are false (or low), the output becomes false.
| 3. What is the truth table of an OR gate? | |
Ans. The truth table of an OR gate shows the relationship between its input signals and the corresponding output. For a two-input OR gate, the truth table is as follows:
| Input A | Input B | Output |
|---------|---------|--------|
| 0 | 0 | 0 |
| 0 | 1 | 1 |
| 1 | 0 | 1 |
| 1 | 1 | 1 |
Here, 0 represents false (or low) and 1 represents true (or high).
| 4. What are the applications of OR gates? | |
Ans. OR gates have various applications in digital electronics. Some common applications include:
- Combining multiple input signals to produce a single output based on their logical OR.
- Implementing logical functions such as addition and comparison in arithmetic circuits.
- Building memory units and storage systems.
- Creating logic gates like NAND and NOR gates by combining OR gates with other gates.
| 5. How can OR gates be represented using logic symbols? | |
Ans. OR gates can be represented using logic symbols. The standard symbol for an OR gate is a plus sign (+) inside a circle. For example, a two-input OR gate is represented as:
____
A ---| |
| OR |
B ---|____|
The inputs A and B are connected to the circle, and the output is taken from the circle.
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