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TPS3809: reset output abnormal

Part Number: TPS3809

Hi team,

My customer is using TPS3809k33, they have observed abnormal reset output when powering off. You can see in the below scope, the pink is VDD and the blue is reset output. At about 30ms Before VDD drops, the reset output voltage begins to drop (to about 3V). Why is this happening? 

Also this is repeatable.

Thanks.

George