Table Of Contents
Digital Signals
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Last Modified: April 19, 2018
A digital signal has two discrete levels—a high and a low level. One example of a digital signal is a transistor-transistor
logic (TTL) compatible signal. A TTL-compatible signal has the following characteristics:
Digital devices can monitor the state of the pulse and can transition the pulse from one state to another. A counter can also monitor the state as well as detect rising edges, a transition from logic low to logic high, and falling edges, a transition from logic high to logic low. Counters are used commonly to count edges and for time measurements, such as measuring digital frequency or the period of a signal.