Pulse diagram
A pulse diagram or timing diagram is used to visualize the functionality of digital circuits . It shows the change in the output signals when the input signals vary.
construction
The horizontal axis corresponds to time, the vertical axis shows the voltage level (in V) or the logic level (either high or low ). The signals are noted one above the other. As the first line of the voltage curve of the clock signal (frequently clock ) applied. This is usually followed by the reset signal of the circuit. In the further course the voltage curves of the data inputs ( inputs ) and outputs ( outputs ) are drawn.
species
Purely logical behavior
In the case of simpler pulse diagrams, only the purely logical behavior of the circuit (without taking the actual signal propagation times into account) is taken into account. The technically required signal propagation times of the components are not entered in the diagram.
Typical signal transit times
In addition to the purely logical behavior, the respective gate delay time of the electronic components ( gates and flip-flops ) can also be taken into account in pulse diagrams . In this case, only the individual, typical numerical value of each component is used for each switching process.
Minimum and maximum signal transit times
According to a running time tolerance calculation, the respective minimum and maximum delay times can also be used in the pulse diagram. In the diagram, the minimum and maximum signal propagation times are taken into account for each switching process. Here, two temporally overlapping signal curves are drawn in for each switching process.