This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

ISO7721: what will the output be if the VCC2 is not stable?

Part Number: ISO7721

I want to check a potential issue found in my customer. The power supply of 5V for VCC2 is not stable. What if VCC2 drop to 3V (still >2.25V), can the output still be normal?

And what is the relation ship betteen VOH and VCC2? The datasheet shows that with 5V(+/-10%) at VCC2, VOH is 4.8V.

Thank you.

  • Hi Aki,

    The device is going to operate normal as long as VCC is between 2.25V and 5.5V. The output voltage of the channel will depend on its respective VCC, in our discussion OUTB voltage will depend on VCC2 voltage. The relationship between minimum VOH and VCC2 is given briefly in datasheet for various voltages, as listed below.

    For VCC2 = 5V±10%, VOHmin = VCC2-0.4V.
    For VCC2 = 3.3V±10%, VOHmin = VCC2-0.3V.
    For VCC2 = 2.5V±10%, VOHmin = VCC2-0.2V.

    For VCC2 voltages that are in-between the above stated voltages, like between 3.6V and 4.5V, the VOHmin is also going to be between the above stated values, i.e., between VCC2-0.3V and VCC2-0.4V.

    Does this answer your question?

    Regards,
    Koteshwar Rao

  • Koteshwar,

    Thank you for the prompt support!