The relevant factor is the rise or fall times, not the clock rate.
Conventionnellement, designers stick to a 100nF cap per IC. Bear in mind that they serve multiple purposes:
- Signal integrity
- Power supply noise
- Internal IC operation
- Radiated EMI
- Susceptibility to EMI
Using an SMT 0805 ou plus petit (smaller is better) shouldn’t take too much board space.
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#Conception de PCB