Flip-flop timing parameters: Which parameters specify the propagation delay from the clock (Cp) input to the Q output?

Introduction / Context:Datasheets list several timing parameters for sequential devices. Correctly identifying propagation delays from clock to output is essential for timing closure and performance prediction.

Given Data / Assumptions:

• Edge-triggered flip-flops with defined delays.
• tPHL and tPLH denote propagation from input to output with polarity.
• Other parameters include setup/hold, pulse width, and maximum frequency.

Concept / Approach:Propagation delay measures time for an output transition after a triggering input event. For clocked devices, the relevant labels are tPLH (LOW-to-HIGH at output) and tPHL (HIGH-to-LOW at output) after a defined clock edge.

Step-by-Step Solution:

Verification / Alternative check:Scope measurements of Q relative to Cp confirm datasheet values within tolerances.

Why Other Options Are Wrong:

• ts, th: Setup and hold requirements, not propagation delay.
• tw(L), tw(H): Minimum pulse widths, not output delays.
• fmax: Maximum toggling frequency, a derived bound, not a delay parameter.

Common Pitfalls:Confusing tpd with setup/hold and ignoring process/voltage/temperature effects on delays.

Final Answer:tPHL, tPLH