SN74AHCT541: Supply current and dissipation calculation

Hey Zeki,

No problem - I can help you out here.

You forgot a square in your power consumption calculations - 8*33pF*(3.3V^2)*50MHz = 144 mA -- which still isn't quite as high as what is shown.

Figure 5 shows a calculated power consumption estimate for the LVC family in general. This is useful to show generally how power relates to voltage and frequency in the device, but shouldn't be used as a replacement for calculation.

I can see how it's confusing since it's listed as a typical curve for the application section -- I'll mark this for deletion in the next datasheet revision.

Hi Emrys,

I think you've calculated the power by multiplying again with the voltage, so it would be 144mW but 43mA @3.3V. In any case, I understand that the figure is supposed to be qualitative and not quantitative. Thanks for the help!

Kind regards,

Zeki