Microprocessor and Memory Basics
Tri-state buffers
Tri-state buffer symbol
![Tri-state buffer symbol Tri-state buffer symbol](../images/tristatebuffer_symbol.gif)
Tri-state buffer truth table | ||
---|---|---|
E | I | Output |
1 | 0 | 0 |
1 | 1 | 1 |
0 | 0 | floating |
0 | 1 | floating |
When enable is low, neither transistor is on and the output is not connected to any voltage by this part of the circuit.
Tri-state buffer circuit
![Tri-state buffer circuit Tri-state buffer circuit](../images/tristatebuffer_circuit.gif)