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Is a decoupling capacitor required between Vcc and GND?

Current spikes generated by signal switching cause Vcc and GND bounce, causing an output overshoot or undershoot, or an excessive output delay. To avoid these situations, it is necessary to reduce the impedance of Vcc and GND lines for high-frequency currents.

Specifically,Vcc and GND lines should be thick and short, and it is ideal to insert a decoupling capacitor (0.01 µF to 0.1 µF) close to the power pin of each IC, which acts as a high-frequency filter.

For low-frequency filtering, a 10-µF to 100-µF capacitor is generally used for each board.

[Figure: Example of decoupling capacitors inserted between VCC-GND]

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