Logic families versus hallmark characteristics: Match the logic family with its most typical characteristic. List I (Family) List II (Characteristic) A. TTL 1. Maximum power consumption B. ECL 2. Highest packing density (within classic NMOS/CMOS/TTL/ECL context) C. NMOS 3. Least power consumption D. CMOS 4. Saturated logic (bipolar, switching into saturation)

Introduction / Context:
Each logic family trades speed, power, and density differently. Knowing their signatures helps in both digital design history and exam matching problems.

Given Data / Assumptions:

• Classic families (TTL, ECL, NMOS, CMOS) considered.
• We focus on hallmark traits, not every variant.
• Relative comparisons: ECL draws high static power; CMOS excels in low power.

Concept / Approach:

TTL is a saturated bipolar family, ECL avoids saturation for speed but at high power, NMOS historically achieved high integration density before CMOS dominance, and CMOS minimizes power via complementary transistors with near-zero static current in ideal logic states.

Step-by-Step Solution:

Verification / Alternative check:

Datasheets and textbooks consistently profile ECL as high-power/high-speed, TTL as saturated bipolar, NMOS as dense but power-hungry, and CMOS as low-power with massive modern density.

Why Other Options Are Wrong:

• Assigning lowest power to TTL conflicts with its bipolar nature.
• Calling NMOS “least power” contradicts static DC paths in pull-ups.
• Labeling CMOS “saturated logic” misstates its operation.

Common Pitfalls:

Projecting today’s CMOS leadership in density back onto historical NMOS/TTL contexts; this item targets hallmark, not current-market outcomes.

Final Answer:

A-4, B-1, C-2, D-3