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ISO7241M: ISO7242M input pin tolerant voltage

Prodigy 80 points
Jae Hyun Kang

Replies: 2

Views: 104

Part Number: ISO7241M

Hi!

In your data sheet "ISO724x High-Speed, Quad-Channel Digital Isolators",

there is "The signal input pins are 5-V tolerant regardless of the voltage supply level that is used." on page 7,

but Absolute maximum ratings says "Vi must be (VCC + 0.5)" on page 9

When I use 3.3V as a VCC,VI must be within 3.8V? 

But the data sheet says "input pins are 5V toleran ~~~".

Thank you.

Kang.

Prodigy 80 points
Jae Hyun Kang
  • Mastermind 21905 points
    Koteshwar Rao

    Hi Kang,

    Thanks for reaching out to us with the question.

    ISO7241M is quite an old device, hence, I don't have answer ready but I will be happy check on this. Looking at the datasheet, it does state that the inputs are 5V tolerant irrespective of VCC and I believe this should be the case. The abs max spec item given in datasheet is for multiple inputs and outputs hence I believe a common statement that I/Os shouldn't exceed VCC+0.5V is stated.

    Please allow me to check if I have these devices in my stock and if yes, I will be quickly able to come back to let you know if the inputs are 5V tolerant indeed. Thanks.

    Regards,
    Koteshwar Rao

  • Prodigy 570 points
    Wilson Guo11

    Hi Kang,

    Thank you for posting in E2E. This is Wilson, from the same team as Koteshwar.

    We checked with ISO7231M in the lab, and found the tolerance of  I/Os is still 5V, regardless of the supply of Vcc. These is no issue when you apply Vcc=3.3V and V_IN=5V.

     

    Best Regards,

    Wilson

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