[PCB_FORUM] Re: same symbol - different number of pins

William,

You did not ask... it is only a suggestion (to Cadence) to enhance 
Allegro.

As far as I know, Allegro does not allow more than one pin number per pin 
in a footprint.

The suggested solution is based on my experience with other tools... If 
two pin three's are possible in the footprint (as is with some tools), 
both common footprint pin 3's connect with the single pin 3 in the 
schematic symbol and in your situation, allows you to use the same 
schematic symbol for the two different footprints. 

Hope this helps... I am afraid I am only added confusion... If so, Please 
accept my apology.
Ed




"William Billereau" <William.Billereau@xxxxxxx> 
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Dear Ed,
 
If Cadence was able to numbering 1,2,3 for a 3 pins and 1,2,3,4 (and not 
1,2,3,3) for a 4 pins device, it will be fine.
We already have devices with different number of pins... either in NC_PINS 
section or POWER_PINS...
So I was just asking for something I was thinking it can be possible.
 
My english is probably not good enough to understand what you meant with 
this kind of comments....
could you explain?
where did I ask for 1,2,3,3??
 
    William.
 
 
 
 

From: icu-pcb-forum-bounce@xxxxxxxxxxxxx 
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Ed Caldwell
Sent: 11 October, 2006 3:08 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: same symbol - different number of pins


Sorry to have submitted what you already knew. Sounds like you have your 
hands full trying to keep up with the EE's! 
If Cadence was able to allow numbering multiple pins the same (i.e. 
1,2,3,3) your quest would be simpler. Perhaps a future enhancement??? 
Ed 


"William Billereau" <William.Billereau@xxxxxxx> 
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thanks, but I was just wondering how to avoid this. 
Just to warn schematic designers that by choosing LM1117 they can have 
different types. 
  
(we have a lot of them taking the first thing that "looks like" what they 
want. 
Then we have to change later for what they purchased....) 
  
If there is no other way I will do it as you suggest. 
 
    William. 
 
 
 

From: icu-pcb-forum-bounce@xxxxxxxxxxxxx 
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Ed Caldwell
Sent: 11 October, 2006 1:59 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: same symbol - different number of pins


Make a different schematic symbol for each (part number) with appropriate 
pin counts. 

"William Billereau" <William.Billereau@xxxxxxx> 
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Hello All. 
 
Is there a solution for such component in ConceptHDL: 
LM1117 from National: 
 
DTX type = TO252 3 pins 
MPX type = SOT223 4 pins . the fourth is the tab that has to be connected 
to OUT pin 2. 
 
How to do it to: 
-have only one symbol body 
(I think without any "tab" pin. I tried with 2 versions on with the TAB 
the other without. But Add Part only take version 1 by default.) 
 
-Connect this TAB automatically to pin 2 OUT 
(I tried to add in the parttable to MPX type a PACK_SHORT='(2,4)' but 
unsuccessfully.) 
 
- Select anyone of both different type in a single parttable.. 
 
Thanks in advance. 
 
 
PS. This case seems to be a common problem. By searching "regulator tab" 
in sourcelink, it returns a case for a MC7805CT2 (or 3). 
http://sourcelink.cadence.com/docs/db/kdb/1998/July/1816165.html 
but the test2_archive.zip contains only a body with the tab, but selecting 
a new one shows a 3 pin JEDEC and the import logic returns a "incorrect 
pin number". 
So this test2 does not work. 
They speak about a multipin.tar available on ftp.cadence.com but this FTP 
site is unaccessible. 
Does anybody get it somewhere? 
 
 
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