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| PCB : route VCC to multiple ICs |
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| claudiux:
Hello, I am trying to build my first PCB. It has 8 ICs on it and I wonder what is the best way to route the VCC to the ICs. I attached some examples . Thanks for tour advices. Claude |
| Chriss:
I would prefer the 1. & 4. trace. Depending on how much current your ic's consuming. .. Sent from my GT-I8260 using Tapatalk |
| forrestc:
--- Quote from: claudiux on July 09, 2018, 05:11:53 am ---I am trying to build my first PCB. It has 8 ICs on it and I wonder what is the best way to route the VCC to the ICs. I attached some examples . Thanks for tour advices. --- End quote --- My preference is to us a fill the top layer entirely with Vcc and flood the bottom layer with ground. Vcc and Ground will then flow 'around' all of your signal traces. You will occasionally run into problems doing this, but generally for most low-frequency designs this works well. Of the ones you showed, I agree with others: avoid the 2nd one, the others are fine. |
| JS:
I'd probably go with 1 in a dual layer design, 4 could be ok for a multilayer board but with dual sided you won't be able to route half the pins of your ICs. I even go with Vcc all over the place, just taking care it goes to the bypass cap and from there to the ic and die there for each ic, just to be able to route sensitive signals in a better way. JS |
| T3sl4co1l:
2-layer PCB? That basically rules out the last one (which would otherwise be the best). So many capacitors, doesn't matter. One cap can be shared between two adjacent ICs, no problem. Maybe more. PDN (power distribution network) analysis can be done to see how much it matters. Typical results say: the distances between ICs and caps should be under 10cm, for the kind of logic beginners would be using (CD4000, 74HC families). Tim |
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