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PICList Thread
'[PIC]: eeprom endurance'
2001\07\13@190709 by Mike Mansheim

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I'd like to start using the internal data eeprom on the
F876 in place of the external 24LC01 we've been using.
However, Microchip's data sheet says the endurance of
the data eeprom is 100,000 writes, vs. 1,000,000 for
the 24xxx (I even saw a reference in the archives that
said endurance of the 24xxx type parts is actually
10 million).
Is Microchip being real conservative here, or is the
data eeprom on these chips just not as robust?
Thanks for any help.

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2001\07\14@014020 by Roman Black

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Mike Mansheim wrote:
>
> I'd like to start using the internal data eeprom on the
> F876 in place of the external 24LC01 we've been using.
> However, Microchip's data sheet says the endurance of
> the data eeprom is 100,000 writes, vs. 1,000,000 for
> the 24xxx (I even saw a reference in the archives that
> said endurance of the 24xxx type parts is actually
> 10 million).
> Is Microchip being real conservative here, or is the
> data eeprom on these chips just not as robust?
> Thanks for any help.


I think you might be right on both counts, Microchip
are indeed conservative with their guaranteed erase/write
cycles, and yes the data eeprom in the PIC is probably
less cycles than a dedicated eeprom chip.

I have heard people talk about getting 12,000,000
erase/write cycles from PIC eeprom at room temps,
Microchip used to promote 1,000,000 cycles and
FAQs about "how to get 10,000,000 cycles". But with
higher operating temps these figures drop a lot,
so Microchip dropped their official figure to
100,000 cycles.

The best advice is to stay within Microchips recent
spec, and rotate your eeprom data through a number of
locations each time you write it. Obviously you need
enough memory to do this.
:o)
-Roman

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2001\07\14@171012 by Olin Lathrop

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> I'd like to start using the internal data eeprom on the
> F876 in place of the external 24LC01 we've been using.
> However, Microchip's data sheet says the endurance of
> the data eeprom is 100,000 writes, vs. 1,000,000 for
> the 24xxx (I even saw a reference in the archives that
> said endurance of the 24xxx type parts is actually
> 10 million).
> Is Microchip being real conservative here, or is the
> data eeprom on these chips just not as robust?

I'm sure Microchip is conservative when publishing such specs - they have to
be.  After all, this is the number of write cycles ALL the parts are capabable
of.  The average HAS to be higher.  Any one part you pick out of a bin will
probably do a lot better than the spec, but you can't rely on that.  It
could be OK to hope for more write cycles for a one off hobby project, but
you don't want to do that in a serious design.

I doubt Microchip is being more conservative with the 16F876 than with the
24LC01, so I assume the latter really can handle significantly more write
cycles.


********************************************************************
Olin Lathrop, embedded systems consultant in Littleton Massachusetts
(978) 742-9014, .....olinKILLspamspam@spam@embedinc.com, http://www.embedinc.com

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