Logic devices whose outputs must share signal lines with the outputs of other devices must have tri- state of open collector outputs to avoid bus contention.

Question

Quizplus · Accepted Answer

Tri-state or open collector outputs allow multiple devices to share the same output lines without causing bus contention because they can be put in a high-impedance state, effectively disconnecting them from the bus when not in use.

Logic Devices Whose Outputs Must Share Signal Lines with the Outputs