Dear all,
I would like to know about abs. max slew rate ''<10 V/ms''.
Is this need to be consider at voltage falling situation?
Is this need to be consider at only voltage rising situation?
Best regards,
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Dear all,
I would like to know about abs. max slew rate ''<10 V/ms''.
Is this need to be consider at voltage falling situation?
Is this need to be consider at only voltage rising situation?
Best regards,
Yamamoto-san,
A fast slew rate can trigger the ESD cells in those pins. The 100kOhm resistor helps by limiting the current so that this is not an issue.
Thanks,
-Clancy
Dear Clancy,
I am sorry for my confusing question.
■QUESTION
What is the reason why you choose '100kΩ'?
Why is 100kΩ enough to protect?
Best regards,
Yamamoto-san,
The issue is that if the ESD cell is triggered and it passes a certain current, then it will not recover until a power cycle. If the current is too high, then the part could be damaged. By limiting the current, we ensure that even if the ESD cell is triggered, then it will recover quickly and resume normal operation. We looked at the worst case conditions (highest PVCC), and then added margin to arrive at the 100kOhm number.
If these pins are pulled up to a lower voltage, then the 100kohm could be reduced.
Thanks,
-Clancy