# Transition time

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{{ safesubst:#invoke:Unsubst||\$N=Unreferenced |date=__DATE__ |\$B= {{#invoke:Message box|ambox}} }} The transition time ${\displaystyle \scriptstyle t_{t}\,}$ is the time a dynamical system needs to switch between two different stable states, when responding to a stable input signal. In a logic circuit (a discrete-time dynamical system whose state is representable as a boolean-valued vector function of time) undergoing a change of state, it identifies the rise time or the fall time of the output voltage. It is therefore correct to speak of two types of transition times