Output state behavior nomenclature: Which TTL output configuration name indicates that a device can present three output states (logic HIGH, logic LOW, and high-impedance)?

Introduction / Context:
Many bused systems require multiple devices to share a common signal line. To avoid contention, devices place their outputs in a high-impedance (Hi-Z) state when not actively driving. In TTL and CMOS, this is called “tristate.”

Given Data / Assumptions:

• Three states: logic 1 (HIGH), logic 0 (LOW), and high-impedance (effectively disconnected).
• Enable signals (OE) typically control when the output drives versus Hi-Z.
• Buses benefit from multiple devices that can float when inactive.

Concept / Approach:
Tristate outputs use additional transistors to isolate the output driver from the pin under disable conditions. This prevents two drivers from forcing opposite levels simultaneously, which would cause excessive current and potential damage.

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