Power characteristics of IC families: “As a rule, CMOS has the lowest power consumption among common IC logic families.” Select the most appropriate evaluation.

Introduction / Context:
Different logic families (CMOS, TTL, ECL, etc.) exhibit distinct power behaviors. This question probes recognition of CMOS power advantages in typical operating regimes.

Given Data / Assumptions:

• Comparison is across common logic families.
• “As a rule” means typical, not pathological edge cases.

Concept / Approach:
Static CMOS consumes very little static power because complementary transistors ideally do not both conduct in steady states. Dynamic power is roughly proportional to C * V^2 * f. Compared to TTL or ECL at similar V and f, CMOS is generally lower in power.

Step-by-Step Solution:

Verification / Alternative check:
Datasheet comparisons (HC/HCX vs. LS-TTL vs. ECL) show CMOS families with lower typical supply current in steady state.

Why Other Options Are Wrong:

Common Pitfalls:
Overlooking dynamic power and assuming it negates CMOS advantages; it does not for typical use.

Final Answer:
Correct