Which one of the following provides three output states ?
Which one of the following provides three output states ? Correct Answer Tri-state buffer
Explanation:
A tri-state buffer is a non-inverting device that produces output when input to EN (enable pin) is high else it goes to a high impedance (HI-Z) state.
It is similar to a normal buffer but it adds an Enable (EN) buffer input that decides whether primary input is passed to its output or not.
If EN signal input is true, the tri-state buffer will produce output.
If it is false, the Tri-state buffer goes to a high impedance state such that it disconnects its output from the circuit.
|
Enable |
Input |
Output |
|
0 |
0 |
High impedance |
|
0 |
1 |
High impedance |
|
1 |
0 |
0 |
|
1 |
1 |
1 |
When EN = 0 then, It will go into a high impedance state or disconnected state irrespective of the input value.
When EN =1 then, It will produce output the same as the input value.
Hence a tri state buffer produces 3 states 0, 1 and High Impedance.
