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ISO7242M: Tolerance for overshoot and undershoot of input signal

Masanori Tachibana
Genius 5350 points
Part Number: ISO7242M

Hello, the support team.

I have a question about Input signal level of ISO72xx series.

[Question]
What tolerance is there for overshoot level and undershoot level of the input signal.
  (Example: ** V for ** μs etc.)
Of course, I have understood that it can not be guaranteed if it exceeds the absolute maximum rating.
I would appreciate it if you could tell me as guideline.

For the standard logic IC, I found the following articles.
e2e.ti.com/.../486703

Sincerely,
M. Tachibana

  • 0
    TI__Guru 53095 points
    Hi Masanori,

    All the input pins have an absolute max spec of VCC+0.5V that shouldn't be violated to not affect device reliability / lifetime. Any continuous voltage greater than VCC+0.5V at input pins will degrades device's life. Similarly, the lowest voltage that can be applied to input pins is GND-0.5V.

    All the input pins have HBM ESD protection diode to VCC and GND and for ISO7242M it is ±4kV. This means that a ±4kV ESD pulse which lasts for about 60ns can be withstood by the device. For any voltage transients that are longer than 60ns, ESD diode will not be able to protect.

    I hope the above points answer your question, thank you.


    Regards,
    Koteshwar Rao
  • 0 in reply to Koteshwar Rao
    Genius 5350 points

    Hi Rao-san,

    Thank you for teaching me.
    I understood that applied overvoltage is no problem if it is within the standard of HBM ESD.

    Sincerely,
    M. Tachibana