Dear Protel users,

I'm trying to use a 176 pin component. Is there a way to list all the pins and
whether each one is input, output, etc. ? It's a real drag double-clicking each
one, comparing its "electrical type" to my data sheets.

It's obvious on symbols with a common geometric representation (NOR gates,
inverters).
On larger chips, the pins marked with the little triangle "CLK symbol" are
obviously inputs,
but what about the other (non-clock) inputs and outputs ?

There seem to be 2 main schematic symbol types:
(a) "functional": a symbol has inputs on the left (and sometimes top and
bottom), outputs on the right. The power symbol for a component has positive
power on top, ground and negative power on bottom. Common for discrete gates
(AND, NAND, NOR, etc.) and op amps. Some libraries break a quad package into 5
symbols, a "power" part and 4 identical "function" parts. One must remember to
place *all* the parts of a real component somewhere on the schematic.

(b) "pseudo-layout": the symbol on the schematic has roughtly the same shape
(rectangular or square) as the real, physical component. Each and every the pin
on the real, physical component is shown on the symbol in roughtly the same
relative position.

Is there a standard way to indicate (on paper) which pins are input and which
pins are output on a (b)-flavored schematic symbol ?

Does anyone actually use the "Hi-Z" pin type ?

--
David Cary
schematic design tips:
http://groups.yahoo.com/group/protel-users/files/protelfaq.html#symbols



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