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
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