Difficulty: Easy
Correct Answer: Minimum LOW-level output voltage
Explanation:
Introduction / Context:
Digital IC datasheets standardize certain parameters so designers can guarantee correct logic interfacing over process, voltage, and temperature. Recognizing which parameters are customary (and which are not) is key for reliable designs and proper noise margin analysis.
Given Data / Assumptions:
Concept / Approach:
Manufacturers guarantee worst-case limits, not typical or “best-case” values, because designs must work under all conditions. For outputs, the LOW level is guaranteed by specifying VOL(max), not VOL(min). Likewise, the HIGH level is guaranteed with VOH(min). Thus, a “minimum LOW-level output voltage” is not a meaningful or useful guarantee and is typically not specified.
Step-by-Step Solution:
Verification / Alternative check:
Examine any mainstream TTL/CMOS datasheet: you will find VOL(max), not VOL(min). Similarly, VOH(min) and IIH(max) are present.
Why Other Options Are Wrong:
Minimum HIGH-level output voltage (VOH(min)) is standard.
Maximum LOW-level output voltage (VOL(max)) is standard.
Maximum HIGH-level input current (IIH(max)) is standard.
Common Pitfalls:
Confusing typical with guaranteed limits; relying on VOL(typ) can lead to insufficient noise margin in worst-case corners.
Final Answer:
Minimum LOW-level output voltage
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