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ADUM4401 output signal abnormal during surge test

Hi Sir,

  Our customer use ADUM4401 for the isolation UART data and signal between Primary side and Secondary side.

We found out that the Input signal is low but the Output signal is high during the surge test (4KV, from AC inlet).

We check the VCC1 still high not meet Truth Table.

Could you let me know have other possibilities that the output keep at high when input is low?



CH1: VCC1, isolator pin4(INB), CH4: Isolator pin13(OUTB)

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