EEPROM cell failures

Hello,
does anybody know when an EEPROM cell failure caused by too many
writings is detect? when I write a value and immediately after the
writng I read it or after some time?

thank you

antares wrote:

> Hello,
> does anybody know when an EEPROM cell failure caused by too many
> writings is detect? when I write a value and immediately after the
> writng I read it or after some time?
> 

When it doesn't hold its data for 10 years (or 100, or whatever it 
claims in the data sheet). Design of the test rig is fairly easy, but 
operation is tedious in the extreme, would even bore a Chelsea fan. Best 
design your system so you can never get anywhere near the write limit, 
or use CRCs or whatever over the contents so you can detect a failing cell.

Paul Burke