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ISO1640: Power On Sequence

user5163865
Genius 3980 points
Part Number: ISO1640

Tool/software:

Hi,

Is there a power supply sequence for VCC1 and VCC2?
Based on the specifications in the data sheet, I don't think there are any restrictions on the power-on sequence.
However, I wanted to ask just to be sure because there is the following sentence:

D/S P34
"A strongly driven input signal can weakly power the floating VCC via an internal protection diode and cause undetermined output."

Best regards,
Hiroshi

  • +1
    TI__Expert 7725 points

    Hi Hiroshi,

    Thanks for reaching out.

    Yes, you are right, there is no power sequence requirement for ISO1640.

    user5163865 said:
    "A strongly driven input signal can weakly power the floating VCC via an internal protection diode and cause undetermined output."

    This Particular Sentence in datasheet explains about how there can be an undetermined state on Output channels in case of powered down state of VCCO.

    Regards
    Varun