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Functional isolate a 8bit databus(100Mhz)

evs
Genius 5910 points
Other Parts Discussed in Thread: ISO7741

Hi,

Any suggestions how to functional isolate a 8bit databus?

Thanks!

  • 0
    TI__Guru 55815 points

    Hi EVS,

    It would help us better if you share more details about your application and requirements. Most of the TI digital isolators can be used for functional isolation. Functional isolation is basically nothing but allowing communication between two circuits that are at two different ground potentials without any safety requirement.

    Since digital isolators have two sides isolated from each other, this can be inserted into any communication bus that needs isolation. The bus will now be broken into two sections with each section having its own GND reference point. For most applications, ISO7741 should meet the requirements. For more details on implementation, please refer to "Application and Implementation" section in datasheet where an example application block diagram is also provided.

    Let me know if you have any other questions, thank you.

    Regards,
    Koteshwar Rao

  • 0 in reply to Koteshwar Rao
    Genius 5910 points

    Hi Koteshwar Rao,

    I understand the basic of isolation, I need to prevent ground loops. It is for a UTMI USB interface.

    What I like to prevent is 5 or 6 digital isolation IC's  to achieve this. Because that is a lot of money and board space.

     So I'm searching for a integrated bi-directional isolator. that can do the trick in one IC. Or an other smart idea.

    Regards.

  • 0 in reply to evs
    TI__Guru 55815 points

    Hi EVS,

    Thanks for your additional inputs, this helps me understand the requirement better.

    We currently do not have any device that supports 8-bit bidirectional UTMI interface. For 16-bit unidirectional interface, you can look at using ISO776x that offers six 100Mbps channels in a single package. Maybe you will be able to achieve isolation using three ISO776x devices.

    Let me know if this meets your requirement, thanks.

    Regards,
    Koteshwar Rao

  • 0 in reply to Koteshwar Rao
    Genius 5910 points

    Ok Thanks,

    It is not what I was hoping for. But apparently this is the best/only solution.

    Regards,

    Evs