ADuM3220 starting delays

Question According the Table 12 of the Rev.C datasheet, the "Outputs return to the input state within 1us of VDD2 power restoration". However, I'm experiencing a delay of about 70us with a VDD2 of 15V. Why? Answer There are actually two different starting delays, and you may not like how the datasheet addressed this. The ~70µs is what we expect the part to do if it passes the internal power on reset threshold which is pretty low, somewhere around 2-3V. The 1 µs number is if the part just enters UVLO, then exits UVLO. The logic table doesn't really show this. All of our parts will have some delay on startup of the secondary side. The older parts (ADuM3220 included) didn't originally express this in the datasheet. We might go back and revisit the older datasheets and add some more information in the future.

ADuM3220: What is the practical use of the two Junction to Case thermal resistance values?

Question There are two Junction to Case thermal resistances but what is the practical use of these? Answer The junction to case thermal resistance can be used in applications where the case temperature is known. There are two junction to case thermal resistance values because the device contains two die, side 1 and side 2.