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SN74AUP2G17: Absolute rating of input spec on SN74AUP2G17

BTjandra
Prodigy 90 points
Part Number: SN74AUP2G17

Hello,

I happen to have a board when a CPU drives "high to low" to SN74AUP2G17 input pins (1A and 2A), it creates under voltage for about ~-(600-700)mV for ~5ns.

Which is beyond the absolute rating -500mV.

But I also notice a footnote in the datasheet:
"2) The input negative-voltage and output voltage ratings may be exceeded if the input and output current ratings are observed."

Is the -500mV being continous, or any how long the spike is counted and degrade the part life cycle ?

Should I look for adding a damping resistor, or is fine.

Thanks,

Borri

  • 0
    Guru 316860 points

    The −500 mV limit can be exceeded as long as the current stays above −50 mA.

    The current flows through the ESD protection diode between the pin and GND. You have observed the voltage drop over the diode being 700 mA, so the current isn't very high. If you want to find out how large the current actually is, you have to measure the current-vs-voltage curve of the diode.