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ADuM1200/1201 glitch on power up/down

We've been using the ADuM1200AR and 1201AR for a while now.  They often produce a small glitch when the output side is already powered up and the input side power is ramping up or down.

I noticed the ADuM1280/1281 should be drop in replacements but they also specify an under voltage lockout threshold.  Will this UVLO guarantee no glitches on power up/down if the output side is already powered up?  Or does it only protect the outputs on the side that is powering up?


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