MCQ Practice Question

Why are tri-state buffers commonly used on a shared digital bus?

ATo allow multiple devices to be connected while only one enabled driver controls the bus at a time
BTo make every device drive the bus simultaneously
CTo convert the bus to analog
DTo eliminate the need for logic levels

Correct Answer: A. To allow multiple devices to be connected while only one enabled driver controls the bus at a time

Explanation: Disabled tri-state outputs present high impedance, allowing several devices to share conductors while preventing normal operation from having multiple active drivers at once.

Reference: Standard digital electronics: bus interfacing