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PICList Thread
'[OT:]A dead PIC'
2003\11\19@104228 by Dennis Crawley

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part 1 414 bytes content-type:text/plain; (decoded 7bit)

I've fried my 16LF877. (Accidentally, +12v to Vdd, negative to Vss)
These are the remains of the autopsy, enjoy.

Regards,
Dennis.

PS: What is that kind of 'antenna' connected to the substrate? (the
unconnected line in the middle)


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part 2 6499 bytes content-type:image/jpeg; (decode)

2003\11\19@104647 by Amaury Jacquot

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Dennis Crawley wrote:
> I've fried my 16LF877. (Accidentally, +12v to Vdd, negative to Vss)
> These are the remains of the autopsy, enjoy.
>
> Regards,
> Dennis.
>
> PS: What is that kind of 'antenna' connected to the substrate? (the
> unconnected line in the middle)

would you have a *much* bigger version ???
this is pretty small and virtually unuseable

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2003\11\19@111353 by Mauricio Jancic

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You can download the bigger version from

ftp://janso.serveftp.com

Enjoy!

Mauricio D. Jancic
Janso Desarrollos - Microchip Consultant
http://www.janso.com.ar
spam_OUTinfoTakeThisOuTspamjanso.com.ar
(54) - 11 - 4542 - 3519
Lugones 3238 "B" - C1430ECN
Capital Federal
Republica Argentina
(54) - 11 - 4542 - 3519
MSN: .....jansodesarrollosKILLspamspam@spam@hotmail.com

>>{Original Message removed}

2003\11\19@112014 by Wouter van Ooijen

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> You can download the bigger version from
>
> ftp://janso.serveftp.com

Does not accept anonymous login...

Wouter van Ooijen

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consultancy, development, PICmicro products

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2003\11\19@112845 by Mauricio Jancic

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It should....

Mauricio D. Jancic
Janso Desarrollos - Microchip Consultant
http://www.janso.com.ar
infospamKILLspamjanso.com.ar
(54) - 11 - 4542 - 3519
Lugones 3238 "B" - C1430ECN
Capital Federal
Republica Argentina
(54) - 11 - 4542 - 3519
MSN: .....jansodesarrollosKILLspamspam.....hotmail.com

>>{Original Message removed}

2003\11\19@113225 by Alan B. Pearce

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>It should....

Ah hah, it does now, it wouldn't earlier :))

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2003\11\19@113639 by Alan B. Pearce

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>>It should....
>
>Ah hah, it does now, it wouldn't earlier :))

Well nearly. I can see the directory sometimes, but it seems to keep timing
out when trying to connect.

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2003\11\19@114640 by Bryan Mumford

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How did you produce the image?

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2003\11\19@115053 by Mauricio Jancic

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I just talk to dennis and I can tell you that he took an xray picture of
it with an odontologist (is that the correct word?) x-ray machine.

Best regards

Mauricio D. Jancic
Janso Desarrollos - Microchip Consultant
http://www.janso.com.ar
EraseMEinfospam_OUTspamTakeThisOuTjanso.com.ar
(54) - 11 - 4542 - 3519
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Capital Federal
Republica Argentina
(54) - 11 - 4542 - 3519
MSN: jansodesarrollosspamspam_OUThotmail.com

>>{Original Message removed}

2003\11\19@121055 by Bryan Mumford

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>I just talk to dennis and I can tell you that he took an xray picture of
>it with an odontologist (is that the correct word?) x-ray machine.

I know that non-windowed, non-flash parts are the same as windowed
parts, and could be erased if there was a way to get UV light into
them. I have wondered if non-windowed parts could be erased with
x-rays.

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2003\11\19@121727 by Mauricio Jancic

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Mmmm lets ask dennis to try!

Mauricio D. Jancic
Janso Desarrollos - Microchip Consultant
http://www.janso.com.ar
@spam@infoKILLspamspamjanso.com.ar
(54) - 11 - 4542 - 3519
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(54) - 11 - 4542 - 3519
MSN: KILLspamjansodesarrollosKILLspamspamhotmail.com

>>{Original Message removed}

2003\11\19@134053 by Andrew Warren

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Dennis Crawley <RemoveMEPICLISTTakeThisOuTspammitvma.mit.edu> wrote:

> What is that kind of 'antenna' connected to the substrate? (the
> unconnected line in the middle)

Dennis:

I don't think it serves any electrical function; I think it's just
there to help support the die and improve mechanical reliability.

-Andy

=== Andrew Warren -- spamBeGoneaiwspamBeGonespamcypress.com
=== Principal Design Engineer
=== Cypress Semiconductor Corporation
===
=== Opinions expressed above do not
=== necessarily represent those of
=== Cypress Semiconductor Corporation

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2003\11\19@134053 by John Ferrell

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RE:
> PS: What is that kind of 'antenna' connected to the substrate? (the
> unconnected line in the middle)

My guess is that they are connections for manufacture & test.

John Ferrell
6241 Phillippi Rd
Julian NC 27283
Phone: (336)685-9606
TakeThisOuTjohnferrellEraseMEspamspam_OUTearthlink.net
Dixie Competition Products
NSRCA 479 AMA 4190  W8CCW
"My Competition is Not My Enemy"


{Original Message removed}

2003\11\19@135716 by Mike Harrison

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On Wed, 19 Nov 2003 09:04:30 -0800, you wrote:

>>I just talk to dennis and I can tell you that he took an xray picture of
>>it with an odontologist (is that the correct word?) x-ray machine.
>
>I know that non-windowed, non-flash parts are the same as windowed
>parts, and could be erased if there was a way to get UV light into
>them. I have wondered if non-windowed parts could be erased with
>x-rays.

I have seen this discussed a lot, and the conclusion seemd to be that x-rays strong enough to cause
erasure would also cause damage.
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2003\11\19@140752 by Dominic Stratten

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Possibly extra heatsinking ?


----- Original Message -----
From: "John Ferrell" >
> My guess is that they are connections for manufacture & test.
>

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2003\11\19@153334 by Herbert Graf

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> RE:
> > PS: What is that kind of 'antenna' connected to the substrate? (the
> > unconnected line in the middle)
>
> My guess is that they are connections for manufacture & test.

       Agreed. My further guess would be it connects to the "scan chain" structure
added to most digital designs. TTYL

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2003\11\19@220749 by Dave Tweed

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Andrew Warren <RemoveMEaiwspamTakeThisOuTCYPRESS.COM> wrote:
> Dennis Crawley <PICLISTEraseMEspam.....mitvma.mit.edu> wrote:
> > What is that kind of 'antenna' connected to the substrate? (the
> > unconnected line in the middle)
>
> I don't think it serves any electrical function; I think it's just
> there to help support the die and improve mechanical reliability.

More to the point, it's the *only* support for the die until the plastic
package has been molded around the lead frame following the wire bonding.

I have to say, I'm a bit surprised that a "Principal Design Engineer" at
a major chip manufacturer didn't have a definitive answer for this!

-- Dave Tweed

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2003\11\19@224735 by James Cameron

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On Wed, Nov 19, 2003 at 07:05:56PM -0800, Dave Tweed wrote:
> I have to say, I'm a bit surprised that a "Principal Design Engineer" at
> a major chip manufacturer didn't have a definitive answer for this!

Probably outside his engineering scope and he couldn't justify using
others in the organisation to derive an (unpaid) answer.  ;-)  I get
this all the time.

--
James Cameron    EraseMEquozlspamus.netrek.org     http://quozl.netrek.org/

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2003\11\20@204816 by Andrew Warren

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Dave Tweed <RemoveMEPICLISTEraseMEspamEraseMEmitvma.mit.edu> wrote:

> I have to say, I'm a bit surprised that a "Principal Design
> Engineer" at a major chip manufacturer didn't have a definitive
> answer for this!

   Yeah, it's pretty sad.  It's a good thing that the talented
   Packaging Engineers in our company don't do any microcontroller
   architecture; they'd probably be almost as bad at recognizing
   the obvious in my field as I am in theirs.

   -Andy

=== Andrew Warren -- RemoveMEaiwspam_OUTspamKILLspamcypress.com
=== Principal Design Engineer
=== Cypress Semiconductor Corporation
===
=== Opinions expressed above do not
=== necessarily represent those of
=== Cypress Semiconductor Corporation

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