>=20
> Did somebody really verified this information?
>=20
> Repeated an erase/write over and over the same address location and
> count how many times it goes until eeprom fails?  Of course 10 million
> erase cycles is a nice number.
>=20
> Let see, one erase/write each 10ms, 100/second, 360k/hour, 10 million
> in 30 hours...  So, if it still running after 24 hours of 10ms
> erase/write over the same address, it means around 8 million cycles,
> and it will be pretty acceptable.
>=20
> Just built a loop routine that write its own count in 3 bytes, repeat
> it in 3 different locations, just to make sure it will not be messed
> up.  Step the count and write to the eeprom every 10ms. This should be
> done in temperature of 25=B0C (77=B0F). After 30 hours just check the
> eeprom contents, the 3 areas should show almost equal numbers,
> variations will be acceptable, but the number read can not be less
> than 4D0000h (5 million).
>=20
> What kills more an eeprom is operation temperature.  If you could keep
> the chip cool, it doubles or tripples the erase/write endurance count.
>=20
> And yes, the life cycle limit is PER ADDRESS, at least based on
> everything I already read about it.
>=20

I Actually did a very simple test for a 24LC16B I2C EEPROM=20
once. It was for a project that had a serial interface to a PC=20
and there were commands to write and read the on board EEPROM=20
from the PC. I let it run on nights and weekends and the EEPROM=20
failed after about 12 milion writes on one single address. The=20
data sheet says minimum endurance is 100 000 erase/write cycles=20
and typical 1 million.

Ruben

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Ruben J=F6nsson
AB Liros Electronic
Box 9124, 200 39 Malm=F6, Sweden
TEL INT +46 40142078
FAX INT +46 40947388
ruben@pp.sbbs.se
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