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TXS02612: About VCCB1 when B1-Port is not used

Part Number: TXS02612

Hi,

Is VDDB1 power required if the B1 port is not used?
Customer connects B1 to the external board, and VCCB1 is supplied from the external board.
The basic configuration is a block diagram of data sheet P2 "APPLICATION BLOCK DIAGRAM".

Thanks,
Yusuke