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ISO7241M: ISO7242M input pin tolerant voltage

Jae Hyun Kang
Prodigy 80 points
Part Number: ISO7241M
Other Parts Discussed in Thread: ISO7231M

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.

  • 0
    TI__Guru 53095 points

    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

  • 0
    TI__Prodigy 570 points

    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