What does "Default Output State" mean for a digital isolator?
As shown in table 4.1, the default state gets output when the input side is unpowered.
&quot;Floating&quot; means that the voltage has a random value, and moves around randomly. If an input pin has a pull-up or pull-down resistor, then its voltage would not be able to float. This device does not have a pull-up resistor; an open input can float, and it reads either low or high, depending on what the voltage happens to be.