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PICList Thread
'[OT] UV Erasers'
1998\03\20@203046 by Rob Zitka

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ANy thoughts on a UV eraser?  Is the Walling ER-3 good?  Does it handle 40
pin PICS, like the 16C74 or smaller?  I would like to spend $50 or under.

Thanks

Rob

1998\03\21@015326 by AllanJH

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In a message dated 98-03-20 20:31:08 EST, you write:

<< ANy thoughts on a UV eraser?  Is the Walling ER-3 good?  Does it handle 40
pin PICS, like the 16C74 or smaller?  I would like to spend $50 or under.

Thanks

Rob >>

Look in Digikey for the Dataerase II, it's under fifty and it works well. I'm
sure others on the list will agree.

Allan
spam_OUTAllanJHTakeThisOuTspamaol.com

1998\03\21@202724 by Shahid Sheikh

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I recall someone on the list a few days ago mentioned the use of a strobe
light to erase a PIC. I have a automobile timing gun that I tried to use to
erase a 12C509. I probably gave it a bit too many flashes (maybe around 100
or so). Now when I stick the pic in the programmer (PicPro from TATO
Computer) it comes back saying the programmer is not turned on. So it
definately did something to the pic.

Does anyone know how much over erasure will ruin the chip? I dont have
anymore UV erasable devices to test this technique to see if it even does
successfully erase the device.

My other question is that, lets say if a strobe light can successfully
erase a device with a few flashes, will that significantly reduce the life
of the chip?

Shahid

1998\03\21@221147 by Richard Nowak

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PIC's are not damaged by erasure. They are damaged by programming.

Since PIC's are very fast CMOS devices, I would suspect that the input
structures to protect the device against ESD are not as robust as you would
like.

ESD can be caused by induced currents i.e., physical contact is not required.

It may be possible that the current dumped in the strobe, if held close
enough to the device, may have been sufficient to damage it.


Rich

At 08:24 PM 3/21/98 -0500, you wrote:
{Quote hidden}

At a recent computer expo (COMDEX), Bill Gates reportedly compared
the computer industry with the auto industry and stated:

    "If GM (General Motors) had kept up with technology like the
     computer industry has, we would all be driving twenty-five
     dollar cars that got 1000 mi/gal."

Recently General Motors addressed this comment by releasing the
statement:

    "Yes, but would you want your car to crash twice a day?"

1998\03\22@082945 by Morgan Olsson

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At 20:24 1998-03-21 -0500, you wrote:
>I recall someone on the list a few days ago mentioned the use of a strobe
>light to erase a PIC. I have a automobile timing gun that I tried to use to
>erase a 12C509. I probably gave it a bit too many flashes (maybe around 100
>or so). Now when I stick the pic in the programmer (PicPro from TATO
>Computer) it comes back saying the programmer is not turned on. So it
>definately did something to the pic.

Probably ESD or induction or something like that.

>Does anyone know how much over erasure will ruin the chip?

Virtually impossibe to over-erase.

>Shahid

I once tried to erase Motorola parts using a camera fash converted to a
stroboscope.  I put the discharge tube directly on chip window, alumina
foil around (except close to connections...) ant let it blink a few Herz
for some hours.  Did not erase the chip and the chip still worked (68HC705K1).

/Morgan
/  Morgan Olsson, MORGANS REGLERTEKNIK, SE-277 35 KIVIK, Sweden \
\  .....mrtKILLspamspam@spam@iname.com, ph: +46 (0)414 70741; fax +46 (0)414 70331    /

1998\03\23@050923 by Tom Handley

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  Rob, Walling's Datarase II series (ER2 and 3) are very reliable. They
support up to 4 devices (up to 40 pin DIP). I found it takes typically
10-15 mins to erase PIC's. Around 3 mins for typical EPROMs. They cost $39
without a timer and $49 with a timer.

  - Tom

At 08:29 PM 3/20/98 -0500, you wrote:
>ANy thoughts on a UV eraser?  Is the Walling ER-3 good?  Does it handle 40
>pin PICS, like the 16C74 or smaller?  I would like to spend $50 or under.
>
>Thanks
>
>Rob
>
>

1998\03\23@143042 by Rob

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Thanks!!  Just wanted to know if they would handle all the way up to those
40 pin C74 chips.

Rob

On Mon, 23 Mar 1998, Tom Handley wrote:

{Quote hidden}

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