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SN74HC14 / Absolute maximum ratings

Kuramochi Tadahiko
Guru 28715 points

Hi,

I received the following question from my customer.

What voltage is absolute maximum ratings of input voltage?

The datasheet shows input current only.

Best Regards,

Kuramochi

  • 0
    Guru 74080 points

    The device has clamping diodes to the positive and the negative supply rail. You can expect about 0.3V to 0.6V for the threshold that will turn on these diodes. So your input should stay within (Vss - 0.3V) and (Vcc + 0.3V). But since there isn't an exact value given, better stay within Vss and Vcc and you're fine. It is never a good idea to operate the device at it's absolute maximum ratings.

  • 0 in reply to Dennis Eichmann
    TI__Guru 62250 points

    Thanks Dennis for your inputs and you are absolutely right.

    The abs max ratings state the input clamp current when Vi<0 and Vi>Vcc . TI doesn't guarantee performance for violating the recommended conditions and violating abs max can cause reliability issues.