In standard TTL logic families, match each parameter to its typical DC level: (A) VOH(min), (B) VIH(min), (C) VOL(max) — choose the correct mapping from the given voltage values.

Introduction / Context:Digital logic families (such as classic TTL) specify input and output voltage thresholds to ensure reliable logic-level interpretation. This question asks you to associate three common DC parameters—VOH(min), VIH(min), and VOL(max)—with their typical voltage values in a 5 V TTL system. Understanding these limits helps diagnose interfacing issues and guarantees noise margins when connecting chips from possibly different subfamilies.

Given Data / Assumptions:

• VOH(min): minimum guaranteed HIGH output voltage from a TTL gate.
• VIH(min): minimum input voltage that a TTL input recognizes as HIGH.
• VOL(max): maximum guaranteed LOW output voltage from a TTL gate.
• Typical TTL reference values: 2.4 V (VOH(min)), 2.0 V (VIH(min)), 0.4 V (VOL(max)), and often 0.8 V (VIL(max)) for context.

Concept / Approach:The mapping is rooted in standard TTL logic levels. Outputs must drive loads with sufficient headroom above/below the receiving inputs’ thresholds. Therefore, VOH(min) should be higher than VIH(min) to create a positive noise margin; likewise VOL(max) must be lower than VIL(max).

Step-by-Step Solution:

Verification / Alternative check:Noise margins (typical): high-side margin = VOH(min) – VIH(min) = 2.4 – 2.0 = 0.4 V; low-side margin = VIL(max) – VOL(max) = 0.8 – 0.4 = 0.4 V. Balanced 0.4 V margins align with canonical TTL datasheets, confirming the mapping.

Why Other Options Are Wrong:

• A-1, B-3, C-4: Assigns VIH(min) = 0.4 V, which is far too low for HIGH recognition in TTL.
• A-5, B-4, C-3: Maps VOH(min) to 0.8 V, which would collapse the high-level noise margin.
• A-1, B-5, C-2: Maps VOL(max) to 1.5 V, not acceptable for a LOW level.

Common Pitfalls:

• Confusing input thresholds (VIH/VIL) with output guarantees (VOH/VOL).
• Assuming CMOS (e.g., rail-to-rail 0–VCC) levels; TTL margins are asymmetric and smaller.

Final Answer:A-1, B-4, C-3