Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!zaphod.mps.ohio-state.edu!caen!kuhub.cc.ukans.edu!whitten
From: whitten@kuhub.cc.ukans.edu
Newsgroups: sci.electronics
Subject: Re: programming EPROMSset seen
Message-ID: <1991May27.180552.31088@kuhub.cc.ukans.edu>
Date: 27 May 91 23:05:52 GMT
References: <1991May26.231046.28772@comp.vuw.ac.nz> <1991May27.152421.4122@zoo.toronto.edu>
Organization: University of Kansas Academic Computing Services
Lines: 29


> You erase EPROMs by exposing them to intense
> short-wave ultraviolet because it kicks up enough ionization in the
> insulator to let the electrons leak out.  Of course, to program the thing,
> -- 
> "We're thinking about upgrading from    | Henry Spencer @ U of Toronto Zoology
> SunOS 4.1.1 to SunOS 3.5."              |  henry@zoo.toronto.edu  utzoo!henry


Humm, I learned that when you exposed the gate to ultraviolet, you
were exciting the electrons trapped in the gate, and in that excited
state, they were able to "tunnel" through the insulator, and thus
disperse themseleves back into the substrate or whereever they go.
Some of that dreaded schrodinger equation stuff involved no doubt.

I think the method I learned on how they are programmed also invloved
the avalanching effect too, which may account for the higher voltages
required?

Regards,
Chris




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 WHITTEN@KUHUB.CC.UKANS.EDU              Chris Whittenburg, Univ. of Kansas
 WHITTEN@UKANVAX.bitnet                        Electrical Engineering
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