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PSpice User Guide Digital simulation October 2019 605 Product Version 17.4-2019 © 1999-2019 All Rights Reserved. Concepts you need to understand States When the circuit is in operation, digital nodes take on values or output states shown in Table 14-1. Each digital state has a strength component as well. Strengths are described in the next section. Note: States do not necessarily correspond to a specific, or even stable, voltage. A logical 1 level means only that the voltage is somewhere within the high range for the particular device family. The rising and falling levels only indicate that the voltage crosses the 0–1 threshold at some time during the R or F interval, not that the voltage change follows a particular slope. Table 14-1 Digital states This state... Means this... 0 Low, false, no, off 1 High, true, yes, on R Rising (changes from 0 to 1 sometime during the R interval) F Falling (changes from 1 to 0 sometime during the F interval) X Unknown: may be high, low, intermediate, or unstable Z High impedance: may be high, low, intermediate, or unstable