I would like to place some decoupling caps for an IC. The IC is on the top while the caps will be on the bottom, opposite side. How should I route them:
A single VIA that connects the IC pin, power plane and cap
Two VIAs, one that connect cap with power plane and another that connects cap with IC pin
Please excuse me if this has been asked previously, but I read a load of resourses and could not find an answer to this. Thanks in advance.
Edit: More detailed picture of the 2 scenarios
(But first, I want to thank everyone for the great answers and comments!)
I have decoupling cap. One pin of the cap is connected to the ground plane by a VIA. That is for both scenarios. The other pin of the cap will be connect a) to power, b) to IC input. Thus, three things have to be connected together ultimately: IC pin, power, cap pin.
Scenario 1: A VIA connects the 3 of them, that is a trace from IC pin goes to the VIA, the VIA is goes through power plane and actually connects with power plane, a trace connects this very same VIA with the cap pin.
Scenario 2: A VIA is connected to power plane and a trace connects cap pin with this VIA. Then another VIA connects the IC pin with the that trace, but the second VIA although it goes through the power plane does not connects with it. So you have two VIAs: one that connects the cap with the power plane and another that connects the cap with the IC pin.