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TS3USBCA4: Vi2c is turned on before Vcc

Part Number: TS3USBCA4

Hi,

Is it okay if Vi2c is turned on before Vcc?
In the customer's system, SCL/SDA are pulled up to 1.8V even when Vcc = 0.
Looking at the absolute maximum ratings, there doesn't seem to be any problem, but please let me know if there are any issues.

Best regards,
Hiroshi