typo here "if you have a 1Hz clock signal with a 350ps rise time"
This line is great: “I see these practices recommended in vendor’s
datasheets all the time! Surely they can’t be wrong? They’re
professionals!”. Yup, I've seen some pretty whacky serving suggestions
that obviously nobody ever actually tried building.
I would add, this is why we prototype, even if you have great
simulation. A few times I've hand populated a digital board starting
with ICs and found it works perfectly without any of the Cs other
than about 10uF on the main rails. Then add a few in as required as
the frequency ramps up. Finally remove all the through-hole drills or
SM pads for components you didn't actually need.
Another point not raised is that every C you can get rid of ups the
MTBF of the board, since caps go bad and are temperature sensitive and
one bad C can bring down an entire circuit.
typo here "if you have a 1Hz clock signal with a 350ps rise time"
This line is great: “I see these practices recommended in vendor’s datasheets all the time! Surely they can’t be wrong? They’re professionals!”. Yup, I've seen some pretty whacky serving suggestions that obviously nobody ever actually tried building.
I would add, this is why we prototype, even if you have great simulation. A few times I've hand populated a digital board starting with ICs and found it works perfectly without any of the Cs other than about 10uF on the main rails. Then add a few in as required as the frequency ramps up. Finally remove all the through-hole drills or SM pads for components you didn't actually need.
Another point not raised is that every C you can get rid of ups the MTBF of the board, since caps go bad and are temperature sensitive and one bad C can bring down an entire circuit.