Difficulty: Easy
Correct Answer: tristate buffers.
Explanation:
Introduction / Context:
IEEE/ANSI logic symbols add small annotations to indicate inversion, enable control, open-collector behavior, and tri-state capability. Interpreting these marks is crucial when reading schematics quickly without full textual notes.
Given Data / Assumptions:
Concept / Approach:
In the IEEE/ANSI convention, an internal diamond near the output denotes special output behavior; the underlining indicates an enabling control that can place the output in a high-impedance state. Designers use this to show that the gate is capable of three states: logic HIGH, logic LOW, and Hi-Z, typically controlled by an enable pin that may be active-HIGH or active-LOW (bubble on the control pin indicates polarity).
Step-by-Step Solution:
Verification / Alternative check:
Consult IEEE/ANSI logic symbol guides used in textbooks and EDA tools; tri-state outputs are commonly indicated with distinctive internal marks.
Why Other Options Are Wrong:
Common Pitfalls:
Confusing inversion bubbles (polarity) with special output-state indicators; bubbles indicate active-LOW, not tri-state behavior.
Final Answer:
tristate buffers.
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