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ISOW7741-Q1: EN_IO1 and EN_IO2 behavior

Jason Lo
Prodigy 20 points
Part Number: ISOW7741-Q1

In the datasheet, "Table 9-3. Channel Isolator Function Table" states that when VCCI and VCCO are powered-up, and EN_IOx is low:

  • "A low value of output enable causes the outputs of the same side to be high impedance and the output of opposite side to be fail-safe default state."

So what happens if the EN_IOx pins on both sides are low?  Do outputs on both sides become high-impedance, or are they driven to default state?

  • 0
    TI__Guru 54715 points

    Hi Jason,

    Thanks for reaching out.

    Jason Lo said:
    "A low value of output enable causes the outputs of the same side to be high impedance and the output of opposite side to be fail-safe default state."

    This statement means to say that EN_IOx on given side disables / floats both the inputs and outputs. Since the outputs are tri-stated, you will see high-impedance and since the inputs are also disabled, the respective outputs on the opposite take the default outputs. If EN_IOx pins are LOW then this tri-states outputs on both side they will be in high-impedance state.

    Let me know if you have any further questions, thanks.


    Regards,
    Koteshwar Rao