What is Buffer ? Why Buffer and Tri-State Buffers are used in Digital Circuits ? @ALLABOUTELECTRONICS
What is Buffer ? Why Buffer and Tri-State Buffers are used in Digital Circuits ?  @ALLABOUTELECTRONICS
Uploaded October 2022 | Updated September 2026, 3 weeks ago
In this video, the basics of the buffer and Tri-state buffer have been explained, and the applications of Buffer and Tri-state buffer in digital circuits are also explained.

The following topics are covered in the video:
0:00 What is Digital Buffer?
0:51 Why Buffers are used in Digital Circuits?
3:15 What is Tri-State Buffer?
6:20 Applications of Tri-State Buffer
9:06 Bi-Directional Tri-State Buffer

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What is Buffer?
Buffer is a Logic gate, whose output is the same as the input. It has a high current
driving capability. It is typically used in digital circuits when one wants to drive the low impedance load or to increase the circuit's fanout.

What is Tri-State Buffer?
It is the buffer with two inputs. The Data Input and Control Input.
The control input decides whether the input will reach to the output or not.
When the control input is high then the Tri-State buffer acts as a normal buffer. And when the control input is low then it operates in Hi-Z mode. In this mode, the buffer provides high impedance and it isolates the output from the input side.

This buffer has three output states, logic '1', logic '0', and Hi-Z mode. Since it has three output states, so it is known as the Tri-State Buffer or Three State Buffer.

This video will be helpful to all the students of science and engineering in understanding what is buffer and Tri-State buffer, and why they are used in digital circuits.

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What is Buffer ? Why Buffer and Tri-State Buffers are used in Digital Circuits ?

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