calculation uv erase for 27Cxxx Eprom

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#1
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Hai all

Are there formulas or equation timer to erased eprom 27Cxx ?

I' used 7 watt uv lamps

Regards
TIro

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I think you're a few years to late!  I seem to recall around 20 minutes was about right. Depends on the state of the lamps (they age).

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Yeah, 15 to 20 minutes sounds about right. Alternatively (when the lamp in your eraser gave up the ghost) a couple of hours on a window sill in bright sunlight would usually do it too ;-)

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clawson wrote:
a couple of hours on a window sill in bright sunlight

I guess you're referring to English "bright sunlight" there?

 

The OP hasn't stated her/his location - but it's quite conceivable that their "bright sunlight" could be a lot brighter than ours!

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clawson wrote:

... (when the lamp in your eraser gave up the ghost)

 

Interesting, in Germany we have exactly the identical phrase "give up the ghost".

Einstein was right: "Two things are unlimited: the universe and the human stupidity. But i'm not quite sure about the former..."

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I forgot the sunlight.

I have many programmed old EPROMs (64K bytes) and my UV eraser was broken.

Although today is cloudy, soon the hot sun will bright again for my EPROMs  ;-)

Thank you for the reminder.

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Window (and most other) glass will block most of the shortwave UV from the sun, hence quartz windows in eproms.

 

 

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As usual, Google has the solution:
https://en.m.wikipedia.org/wiki/EPROM

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Thank you for info

Indeed,In the past.I'd used the sunlight from morning to afternoon.
I lived in Indonesia where the cloud unpredictable.
Also when used sunlight the IC became very hot.

Regards
Tiro