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Original question:

TCA9617A: B-side to B-side connection issue

TCA9617B: TCA9617B VCCA&B Requirement

Qiang Ren
Intellectual 2055 points
Part Number: TCA9617B

Team,

From the D/S of the TCA9617B, we can see that we require VccA<=VccB. May I check with you about the reason why we have this requirement?

And what may happen if the VccA&B can't meet the D/S requirement? Thanks!

Qiang Ren

  • 0
    Guru 316760 points

    There is a diode from VCCB to VCCA. A current will flow and might prevent the device from working correctly.

  • 0
    TI__Mastermind 47448 points

    Hi Qiang,

    This device was defined and designed to support VCCA <= VCCB for proper usage. I believe this supply voltage requirement is also needed to properly setup the VILC spec that helps to decide which side is driving a low-logic signal. 

    If VCCA and VCCB can't meet the D/S requirement, then TI cannot guarantee the electrical specifications in the datasheet, although the device may work with something different than VCCA <= VCCB. I have completed much testing on this device with VCCA > VCCB, so I cannot comment on what else might happen with this device if used that way.

    Regards,

    Tyler