EPROM erase times and lifespan

Gordon JC Pearce MM3YEQ gordonjcp at gjcp.net
Thu Jan 29 10:12:40 CST 2009


On Thu, 2009-01-29 at 10:31 -0500, Dave Dunfield wrote:
> > Working with EPROMs, one must have an eraser. I built my own a while back, using a germicidal UV
> > lamp tube, a flourescent fixture, a sealed box and a programmable timer. It works well, and I
> > typically can erase an batch of eproms in like three minutes.
> 
> > ...
> 
> Three minites seems awfully fast for complete erasure. For example, an Intel 1982 databook
> lists erase time for the 2764 as 15-20 mins at a distance of 1 inch from the lamp (2537
> Angstroms, 12000 uW/CM2).
> 
> This is pretty consistant with what I've observed - I normally bake em for about 15 mins.
> I've seen some take as long as 30 mins (usually older "fixed program time" devices).
> 

Yup.  I've found that some devices can take as much as half an hour or
more under the lamp in my eraser.  Of course, the tube could be going
soft...

Gordon





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