On Sun, 19 Dec 2010 19:12:34 -0500, "Olin Lathrop" said:
> 1 - The pins of IC1 are in pin number order!  That may save you a few
> minutes making the symbol once, but wastes many times that over the life
> of
> the schematic as people have to figure out what's where.

In this case I agree with you, since the schematic symbol puts the pins
on two sides and the chip has them on four. But quite often when doing a
design from scratch I like to have the pins on the schematic symbol echo
the physical layout of the part. If I have a choice about pin
assignment, I can pre-optimize my board layout just by making the
schematic look tidy. I don't know about other CAD packages, but the one
I use lets me have unlimited schematic symbols for each part, and I take
advantage of that. So I have no hard and fast rules, I do what works
best for each job.

Best regards,

Bob


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