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BUF20800: Relation between VS power supply and I2C

Part Number: BUF20800


I previously asked about BUF20800 in the following thread.
In connection with that, I would like to ask you a question.

I understand that I2C can not be done with only the VSD power supply.
When VS power supply is applied after VSD power supply is applied, what voltage will I2C be effective for VS power supply?
Please let me know if there is a threshold of VS power supply or time restriction etc.

Best Regards,