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SN74AHCT14/ Power dissipation capacitance

user1186547
Prodigy 30 points
Other Parts Discussed in Thread: SN74AHCT04, SN74AHCT14

On the datasheet of SN74AHCT14, it says its power dissipation capacitance is 112pF whereas that of SN74AHCT04 is 14pF. And most of SN74AHCT series have around 12pF to 20pF of power dissipation capacitance.

Would you tell me 112pF is really correct for SN74AHCT14?

Regards,

  • 0
    Expert 2410 points

    Looks like it's the value of all capacitances toggling inside the IC. And when using Schmitt-Trigger inputs, the more complex circuit may cause an increase of this value.

    Read this: CMOS Power Consumption and Cpd Calculation, scaa035b.pdf

    Good luck,
    Edwin Krasser