Time required for a gate or inverter to change its state is defined as?
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rise time
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decay time
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charging time
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propagation time
Propagation delay is the time required for a digital signal to travel from the input to the output of a logic gate or circuit, representing the state transition time. Rise time measures output transition from low to high, decay time from high to low, while charging time is not standard terminology for gate delays.
Propagation delay (time) is the standard digital-electronics term for the time a logic gate or inverter takes to change its output state after its input changes — a fundamental parameter used to determine the maximum operating speed of digital circuits. 'Rise time' and 'decay time' (or fall time) describe how long a signal takes to transition between voltage levels within a single edge, not the gate's overall response delay, and 'charging time' relates to capacitor/RC charging behavior, not digital logic switching — so 'propagation time' is the precise, textbook-correct term.