Digital Electronics - Digital Concepts - Discussion

Thanks swapnil.

I think a thumb rule is that the difference between logic 0 & logic 1 voltages should be atleast <1.5-2 V. In any case, the logic 0 & logic 1 should have a non-ambiguous margin. For 0.8-2 V, the margin is 1.2 V, which may be considered invalid by this logic.

On other hand, every logic family has a specified minimum voltage specification. That determines the range for said family.

It depends on the ciruit and its spec. If the ASIC swings b/w this voltages and able to identify HIGH and LOW within Vih(min) and Vil(max)it is accepted.

Thanks roy.....

Range is very less for on to off(if off state is 0.8 then on state should be greater than 1.5 volts for off range value, hence we cannot take a range from 0.8v - 2 v).

Please give its explanation.