[sdiy] NC pin on ICs

[Laurie Biddulph]

if the pin is marked NC then technically there is NO CONENCTION inside the 
chip so making an electrical connection will have an affect. It would make 
sense to tie the pin to a voltage based on the fact that (as for this case) 
there is an option to buy the device with this pin active. Providing the 
correct voltage will mean either device can be fitted and function 
correctly.

It would be a very rare case where applying voltage to a NC pin would do 
anything and in theory this would indicate that it was NOT a NC pin.

Best Regards

(Mr) Laurie Biddulph
Phone: +61 (0)2 4340 0938
Mobile: 0400 257 645

Elby Designs
ABN: 70 022 727 605
http://www.elby-designs.com

This e-mail and any files transmitted with it are confidential and intended 
for the addressee only.
If you are not the addressee you may not copy, forward, disclose or 
otherwise use it, or any part of it, in any form whatsoever. If you have 
received this e-mail in error please notify the sender and ensure that all 
copies of this e-mail and any files transmitted with it are deleted.
Any views or opinions represented in this e-mail are solely those of the 
author and do not necessarily represent those of Elby Designs.
Although this e-mail and its attachments have been scanned for the presence 
of computer viruses, Elby Designs will not be liable for any losses as a 
result of any viruses being passed on.

Please consider the environment before printing this email

----- Original Message ----- 
From: "Dave Kendall" <davekendall at ntlworld.com>
To: "David G. Dixon" <dixon at interchange.ubc.ca>
Cc: <synth-diy at dropmix.xs4all.nl>
Sent: Friday, May 22, 2009 8:33 PM
Subject: Re: [sdiy] NC pin on ICs


> I've wondered about that too - specifically with a 4mHz XTAL oscillator 
> IC, in which some versions have pin 1 assigned as an enable and others 
> where it is NC.
> Would it be safe to tie it to +V for the version where pin 1 is NC?
>
> cheers,
> Dave
>
> On May 22, 2009, at 04:09, David G. Dixon wrote:
>
>> This may sound like a weird question, but here goes:
>>
>> When a pin on an IC (such as, say, the HFA3128 PNP transistor array in
>> 16-pin DIP format) is denoted as "NC", can it actually be connected to
>> something (say, the all five of the emitters) without adverse effect?  (I
>> ask this because it will make a layout I'm working on significantly 
>> easier.)
>>
>> _______________________________________________
>> Synth-diy mailing list
>> Synth-diy at dropmix.xs4all.nl
>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>>
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>