30 Sep
2007
30 Sep
'07
6:41 p.m.
On Sunday 30 September 2007 12:05, 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.
Normally they seem to erase in ten minutes, twenty at the most - these pair
have had 30 so far. Just wondering whether to keep baking 'em or just toss
them because they're junk...
Sounds to me like what you're seeing isn't so much a problem with the memory
array in there as a problem with the output pin, likely shorted to ground...
I've encountered a few like that. Most likely caused by inserting or removing
them with power applied?
--
Member of the toughest, meanest, deadliest, most unrelenting -- and
ablest -- form of life in this section of space, ?a critter that can
be killed but can't be tamed. ?--Robert A. Heinlein, "The Puppet Masters"
-
Information is more dangerous than cannon to a society ruled by lies. --James
M Dakin