30 Sep
2007
30 Sep
'07
9:41 a.m.
Jules Richardson wrote:
Is there any kind of common failure mode for EPROMs?
I've just had a
couple which are refusing to erase - I'm getting repeating patterns of
bits which refuse to clear (i.e. go high) under the eraser.
Off the top of my head:
- Stuck address lines (a given address line has no effect on the output of
the EPROM)
- Stuck data outputs (a given data line is always low or always high)
- Failed memory cells (a given cell has the same value, even after repeated
erasing)
I'd be inclined to just dump them, with a spot of hammer-assisted destruction
first. At least the latter ensures they won't creep back into your parts bin
at some later date, ready to cause more trouble...
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