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ADuM4401 isolator chip power down at VDD2 pin

we use ADuM4401 Isolator chip with 3.3V power supply at VDD2 pin 16, when we short the input to ground pin 11& pin 9 ... the power supply at VDD2 pin 16 is pulling down to 2.8 v and gradually increasing back to 3.3 V. Why is this happening? anyone there to help?

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