It really is a matter of preference. We show ALL power pins and do not use hidden pins at all. This includes 256 pin PGAs etc. A suffering engineer is one who cannot decipher the different 3.3v, 5v, 12v, agnd, dig gnd pins on an IC on a circuit diagram because the schematic drawer did not think they were necessary. The schematic writer , of course, does not probably use it for servicing later on. Others do.
If you only have 5v and gnd for a large digital circuit then there may be an argument for hidden power pins, otherwise it's horses for courses and personal preference. Regards, Chris Mogford CAD/CAM Specialist Varian Australia, Melbourne, Australia p.s. A nand sr gate looks great with power pins and bypass caps. And I just luv those microcontrollers fully pinned in all their glory. Reminds me....... Ah, but that's another story. ----- Original Message ----- From: "Terry Harris" <[EMAIL PROTECTED]> To: "Protel EDA Forum" <[EMAIL PROTECTED]> Sent: Friday, December 07, 2001 3:02 PM Subject: Re: [PEDA] Using Multiple Vcc for same part > On Thu, 6 Dec 2001 16:22:34 -0800, Dwight wrote: > > >PERSONALLY, I don't find a couple extra pins per IC that cluttering. > > But what about gates, what does a nand SR latch look like with power pins? > Or big chips which might have 40 power pins? > > >I also > >find it easier to have the power net listed there than having to flip to > >another page (especially since that "flipping" is usually on a pdf file!). > >HOWEVER, much of this stuff IS personal preference -- to each his own! > > Unless you are the only one who is ever going to see the schematic I > disagree. Schematics distributed with products may have to be read by > hundreds or thousands of engineers for many years to come. > > Someone screwing up netlist generation a couple of times because they > didn't understand or check hidden power connections is not a good excuse > for making all those engineers suffer. > > > Cheers, Terry. * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * To post a message: mailto:[EMAIL PROTECTED] * * To leave this list visit: * http://www.techservinc.com/protelusers/leave.html * * Contact the list manager: * mailto:[EMAIL PROTECTED] * * Forum Guidelines Rules: * http://www.techservinc.com/protelusers/forumrules.html * * Browse or Search previous postings: * http://www.mail-archive.com/[email protected] * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
