7476 J-K flip-flop datasheet timing: Why is only a minimum clock pulse width (HIGH and LOW) specified rather than nominal or maximum values?

Introduction / Context:
Datasheets for edge-triggered flip-flops such as the 7476 specify minimum clock HIGH and LOW pulse widths. This question probes understanding of how timing specifications guarantee correct operation over process, voltage, and temperature variations.

Given Data / Assumptions:

• Edge-triggered J-K flip-flop (7476 family behavior representative).
• Clock pulse width specs appear as minimums for tW(H) and tW(L).
• Designs must meet or exceed these minimums under worst-case conditions.

Concept / Approach:
Minimum pulse width ensures internal latches and gating have sufficient time to propagate signals and reset/set internal nodes, even in the slowest, highest-temperature, lowest-voltage silicon corners (the worst case).

Step-by-Step Solution:

Verification / Alternative check:
Simulate or measure across temperature and supply extremes; pulses shorter than the minimum lead to missed or metastable captures, while longer pulses work safely.

Why Other Options Are Wrong:

• Nominal value: Nominals do not guarantee operation across corners.
• Best-case condition: Guarantees must cover the slow corner, not the fast corner.
• Typical operating condition: Typicals are informative but not sufficient for design guarantees.

Common Pitfalls:
Designing to typical datasheet numbers, ignoring temperature and voltage derating, and neglecting clock duty-cycle requirements.

Final Answer:
worst-case condition