On Mon, 07 Mar 2005 12:17:38 -0500, Dave VanHorn wrote: > > > >You guys really like to over-engineer stuff. A 0.1 uF chip reasonably > >near the power pins should take care of almost any circuit a PIC would > >be involved in. For extra decoupling, put 10 ohms in series with the > >Vdd supply (before the capacitor). Don't worry about custom chip > >sockets etc. You Ain't Gonna Need It (tm). > > It's not "over engineering", it's simply getting the best result for the > same dollars. > 10 ohms resistive could cause serious problems, if any of the chip's > outputs are even slightly loaded, and even just a capacitive load. Obviously, it's not appropriate for power circuits. But it was standard procedure for logic circuits when I was designing pagers and cell phones. The resistors keep the power bus clean for best RF performance. They're cheap enough for mass production. They make troubleshooting a current hog easy. For capacitive loads, make sure the bypass cap is appropriately larger than the load capacitance, so it can supply the current for transitions. Regards, Mark markrages@gmail -- You think that it is a secret, but it never has been one. - fortune cookie -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist