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SN74LVC244A: bypass capacitance

Yasushi Fujiwara
Genius 11695 points
Part Number: SN74LVC244A

Hi Experts,

I want to get your advice for bypass capacitor of VCC-pin. The datasheet recommend to use 0.1uF capacitor for bypass capacitor. My concern is that there are DC bias characteristics as ceramic capacitor. So do you have any guidelines to determine the capacitors? For instance, 40% decline is acceptable, etc.

Your support would be much appreciated.
Best Regards,
Fujiwara

  • 0
    Guru 242960 points

    Decoupling capacitors should have as low an inductance as possible; the capcitance is a secondary concern. Even an actual capacitance of 10 nF would still be enough, as long the capacitor can handle extremely fast current spikes. Therefore, ceramic capacitors (which are available in small, low-inductance packages) are preferred, even if they have cheap X5R dielectric.

    The DC bias characteristics are already taken into account in that recommendation; just use a nominal 0.1 µF capacitor.