A way to erase OTP components?

From: Arno Kletzander <Arno_1983_at_gmx.de>
Date: Wed Jan 22 07:04:01 2003

Hello everybody, this is something I've been wondering about for some time
now. Perhaps here is the place to ask, since it's about one of the "inner
secrets of silicon":

Tony Duell wrote:
> The 8751 is the EPROM version of the 8051 microcontroller. It's otherwise
> identical to it.
> If it's in a ceramic package with a quartz window, then you can erase it
> like any other EPROM and reprogram it. If it's in the plastic package,
> then it's the OTP version.

If in fact the same die was used in both components, then it's only the
plastic (which is impenetrable to the commonly-used ultra-violet light) that
prevents the OTP variant from being erased and reprogrammed.

However, there are kinds of radiation similar to light which *will*
penetrate the plastic housing...you see where this goes? Will the memory be erased
when you, say, X-ray the OTP component, will it stay unaffected, or is the
thing just going to die?

(just outta curiosity)

Arno Kletzander

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Received on Wed Jan 22 2003 - 07:04:01 GMT

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