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ISOW3080: Driver Functional Table Clarification

Julius Burtell
Intellectual 1197 points

Part Number: ISOW3080

Hi team,

Quick clarification question from the prelim datasheet:

Table 8.2 calls out a Hi-Z state until VDD is present, which makes sense, but we have an invalid operational state when VDDL is not present.

Is there any more information available on what state the bus is in when VDDL is low? I see the note where it's indicated that IO inputs can cause indetermined output, but is there any information on the output state if only VDD is present, where VDDL, D and DE are both low? I assume that the output would be hi-Z but would like to confirm.  

Thanks,

Julius

  • +1
    TI__Guru 56895 points

    Hi Julius,

    Thanks for reaching out.

    Your understanding is correct. When VDD is powered up (PU) while VDDL is powered down (PD), the outputs on the secondary side go to Hi-Z. You can disregard the line saying "invalid operation", this is being updated. Thanks.


    Regards,
    Koteshwar Rao