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ISOW7842: Output states when VCC < 2.1 V

Part Number: ISOW7842
Other Parts Discussed in Thread: ISOW7742

Hello

I am trying to figure out in which situations which of my output signals will be in an undetermined state as described in the datasheet in chapter 9.4. There it is state underneath Table 9-3. that:

(3)  The outputs are in an undetermined state when VCC < 2.1 V. Are my assumptions as in the drawing bellow correct (assuming that OUTA/B are on the VISO side and OUTC/D are on the VCC side)?

  • Hi Marc,

    Welcome to TI E2E forum!

    Thank you for your interest in ISOW7842 and for sharing detailed waveform diagram to support your questions. The waveform is mostly accurate, I have marked a couple regions with red ellipses where the outputs are going to be at default state as their respective inputs are not ready / powered. Other than this, everything else looks correct. Please see the image below.

    ISOW7842 is our first-generation ISOW family while we now have our second-generation family ISOW77xx that offers significant performance improvements. If your project is in development phase then we recommend ISOW7742 due to its performance advantages especially in the radiated emissions.

    Let me know if you have any questions, thanks.


    Regards,
    Koteshwar Rao

  • Hi

    Thank you for the prompt answer. I'll gladly look into the ISOW7742. I would need 900 pcs very soon though.

    Best Regards

    Marc