Lpc2000

Yes, thank you. I'm quite excited to start working with this device.

Dave


--- In lpc2000@yahoogroups.com, "philips_apps" <philips_apps@y...> 
wrote:
> Hi Dave,
> 
> let me try to explain. The 10 years are specified after all 10k 
> reprogramming cycles done. It is all about how many ppm (or for 
that 
> matter fits) the device will have. The target is always to have 0 
> failures over the specified time. Statistically thats not really 
> possible but every vendor tries the best to get as close as 
possible. 
> With this is mind the typical retention is much more along the 
value of 
> 100 years (no typo) than 10 years. Typical being that even at 100 
years 
> less than 1 in 100 may be less than 1 in 1000 devices is expected 
to 
> fail.
> 
> So, in an attempt to answer your question what happens after ten 
years? 
> The probability of one bit in the whole flash memory failing 
increases 
> day by day, and after ten years the fit rate is just a little 
higher 
> than after 1 year and just a little lower than after 20 or even 50 
or 
> 100 years. To the closest approach what will happen, nothing bad to 
the 
> flash.
> 
> There was an answer from Robert stating that reprogramming cycles 
have 
> a stronger effect on the data retention than temperature, well both 
> have an effect because high temperature is used to simulate fast 
aging, 
> so at higher temperatures, the years go by faster ;-) 
> 
> Given your less than 60C and just a few programming cycles, though 
> shall not fear any failures in more than 20 years. 
> 
> Hope this help, Robert
> 
> 
> --- In lpc2000@yahoogroups.com, "foreigner_ca" <va3dp@r...> wrote:
> > Hello to all, this is my first post in this group.
> > 
> > I'm thinking of using the LPC2138 in a design that must have a 20
> > year life cycle. The literature says the flash has only 10 year 
> > retention, but in other flash devices that is affected by
> > temperature, write cycles etc. 
> > 
> > Is there any more detailed info on this? For example, if I only 
write 
> > to the flash a few times and keep the temperature below 60C, can 
I 
> > expect longer retention?
> > 
> > Cheers
> > Dave