There are many logic levels with which embedded engineers need to deal with they are TTL, CMOS, HCMOS etc.
Some of the important definitions that we should know related to a logic levels are as below.
VIL defines the maximum voltage level that will be interpreted as a ‘0’ by a digital input.
VIH defines the minimum voltage level that will be interpreted as a ‘1’ by a digital input.
VOL defines the guaranteed maximum voltage level that will appear on a digital output set to ‘0’.
VOH defines the guaranteed minimum voltage level that will appear on a digital output set to ‘1’.
Below is an example for TTL. Also have a look at the undefined state!
eguru
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