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Renesas Electronics America - Knowledgebase

Is there any limit of the capacitance?

Latest Updated:08/01/2007


A capacitor should be placed between a ground line and signal line to suppress noise. Is there any limit of the capacitance?


This generally poses a problem to MOS devices.
An output of the device permits a value defined as a load capacitance, including the wiring capacitance and input capacitance of another connected device. If this is exceeded, a circuit that suppresses an inrush current is necessary.
If the capacitance to be added is too high, the signal changes slowly. Therefore, it must be confirmed that the timing of the input of the device is satisfied and that the input is not affected by the through current (the problem of the timing also applies to the analog device).
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