An overview of the different types of delay times which occur in a switching
process of a typical logic device is given in Figure B.2.
Here, the output signal is retarded by a certain amount of time
. After this retardation, the device changes its state and
switches. This time is called transition time
and is counted
from the time where the output signal first reaches
of its maximum
output signal until the time it reaches
of its stationary maximum
The sum of both time periods plus any decaying times due to signal overshoot
is called propagation delay
Other authors (cf. ) propose to measure the transition time from the
reference voltage level for both the rising and the falling edges.