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TCA9517A: the conditon VCCA < VCCB

Part Number: TCA9517A
Other Parts Discussed in Thread: TCA4311A

Hi all

Would you mind if we ask TCA9517A

<Question>
The data sheet P12 shows "VCCA < VCCB".
If the condtion is VCCA = VCCB, it can not transmit the data between SCLA(or SDAA) and SCLB(or SDAB)?
And then, is it possible to use the condition VCCA = VCCB?

Or, should we use TCA4311A in case of VCCA = VCCB?

Kind regards,

Hirotaka Matsumoto