How much times can an EPROM windowed Pic be programmed /erased? Thanks.
David BALDWIN <MITVMA.MIT.EDU> wrote: PICLIST
> How much times can an EPROM windowed Pic be programmed /erased?
They're characterized for at least 100 erasures... Some people have
reported 1000 in informal tests.
=== Andrew Warren - ix.netcom.comfastfwd
=== Fast Forward Engineering, Vista, California
Andrew Warren wrote:
> David BALDWIN <MITVMA.MIT.EDU> wrote: PICLIST
> > How much times can an EPROM windowed Pic be programmed /erased?
> They're characterized for at least 100 erasures... Some people have
> reported 1000 in informal tests.
You can use them until the paint come off and you're not sure what
it is (was). I've got an old trusty '71 like that.
Tjaart van der Walt
| Another sun-deprived R&D Engineer slaving away in a dungeon |
| WASP International http://wasp.co.za |
| GSM and GPS value-added applications |
| Voice : +27-(0)11-622-8686 | Fax : +27-(0)11-622-8973 |
Strange, some people told me that in the past (3 years), 10 times was a
max. for PIC17. Any explanation?
Andrew Warren wrote:
\ / David BALDWIN
\ ALCATEL / Design engineer
\ / SdM (Societe de Microelectronique)
\ / B.P. 4205 Phone : +32 (0)71 442932
V B-6000 Charleroi Fax : +32 (0)71 442905
> Strange, some people told me that in the past (3 years), 10 times was a
> max. for PIC17. Any explanation?
Window PICs can be reprogrammed, AFICT, until one of the following happens:
 The pins break in such a way that repair isn't feasible.
 The parts are destroyed electrically [just about impossible; I BLEW UP
a 1K resistor against a PIC port pin (other side of the resistor was at
AC120--oops!) but the PIC survived with no apparent damage].
 The part wears out from excessive programming (note that if the program-
mer only gives the required "dose" of programming, the part will last
much longer than if the programmer regularly "overdoses" the part.)
 The programmer malfunctions and gives an extreme overdose (the symptom
of this is often that one bit every 16th or so location won't program;
I think the column driver gets burned out).
If you use good sockets, careful design, and a good programmer, you should be
able to reprogram the parts until the cows come home. If you don't then the
parts' useful lifetime may be much shorter.
re: EPROM Endurance
Andy, where did you find this info? When I saw David's original post,
I searched my data books and the programming specs. I've got well over
100 cycles on two 16C74A parts and I thought they would handle at least
1000 cycles. I'm about to move my project to the 16C77 but I'd like to
know the specified endurance. Thanks,
At 03:29 AM 7/10/97 -0800, you wrote:
> re: EPROM Endurance
> >> How much times can an EPROM windowed Pic be programmed /erased?
The half life of a part on my bench is usually less than the EPROM
erasure spec due to placing 120VAC on RA2, spilling coffee on the
whole thing, my cat knocking over the soldering iron and melting the
protoboard into the leads, etc. etc. So far I have not seen a part
that I could wipe out by erasing too many times, or by leaving it in
the eraser overnight.
-- Lawrence Lile
More... (looser matching)
- Last day of these posts
- In 1997
, 1998 only
- New search...