Retriggerable vs non-retriggerable one-shot — what is the key difference? Choose the statement that correctly distinguishes how the output pulse behaves with successive triggers.

Introduction / Context:One-shot multivibrators are either retriggerable or non-retriggerable. Understanding how additional triggers affect the timing pulse is crucial in pulse-width control and glitch filtering.

Given Data / Assumptions:

• We compare output behavior under multiple triggers arriving before the pulse expires.
• One device is retriggerable; the other is not.

Concept / Approach:In a retriggerable one-shot, any valid trigger that occurs during the active pulse restarts the timing interval, effectively lengthening (stretching) the total pulse width. In a non-retriggerable one-shot, additional triggers received while the pulse is active are ignored until the device returns to its stable state.

Step-by-Step Solution:

Verification / Alternative check:Datasheets typically note "retriggering extends the output pulse" for devices like 74x123, contrasting with 74x121 (non-retriggerable).

Why Other Options Are Wrong:

• Nonretriggerable can only be triggered once: false; it can be triggered again after it times out.
• Retriggerable can be triggered many times: true but incomplete; the distinguishing effect is pulse extension.
• Nonretriggerable stretches the pulse: incorrect by definition.
• Successive triggers shorten the pulse: opposite of retrigger behavior.

Common Pitfalls:

• Confusing "ignoring triggers while busy" with "cannot be triggered again ever".

Final Answer:The output pulse can be stretched with a retriggerable.