Searching \ for '16F84 EEPROM Write/Erase Cycles' in subject line. ()
Make payments with PayPal - it's fast, free and secure! Help us get a faster server
FAQ page: www.piclist.com/techref/microchip/memory.htm?key=eeprom
Search entire site for: '16F84 EEPROM Write/Erase Cycles'.

Truncated match.
PICList Thread
'16F84 EEPROM Write/Erase Cycles'
1998\03\10@021628 by hansen

flavicon
face
Hi:

  I am working on a program that is going to do a lot of writing
to the EEPROM data memory on a 16F84.  Microchip estimates that
these chips are good for 1,000,000 write/erase cycles.  Does
anyone know what this means?  Does it mean that each byte
individually is rated for 1,000,000 cycles or does it mean that
the total write/erase cycles for the data EEPROM is rated at
1,000,000 cycles.  I'm assuming the former, but if I've made
a mistake about this I need to redesign my project.

Thanks!

John Hansen

1998\03\10@022730 by Andrew Warren

face
flavicon
face
John Hansen <spam_OUThansenTakeThisOuTspamoak.ait.fredonia.edu> wrote:

> Microchip estimates that the [data EEPROM in a 16x84 is] good for
> 1,000,000 write/erase cycles.  Does anyone know what this means?
> Does it mean that each byte individually is rated for 1,000,000
> cycles

   Yes.

   -Andy

=== Andrew Warren - .....fastfwdKILLspamspam@spam@ix.netcom.com
=== Fast Forward Engineering - Vista, California
=== http://www.geocities.com/SiliconValley/2499

1998\03\10@064948 by Caisson

flavicon
face
> Van: John Hansen <hansenspamKILLspamoak.ait.fredonia.edu>
> Aan: .....PICLISTKILLspamspam.....MITVMA.MIT.EDU
> Onderwerp: 16F84 EEPROM Write/Erase Cycles
> Datum: dinsdag 10 maart 1998 4:34
>
> Hi:
>
>    I am working on a program that is going to do a lot of writing
> to the EEPROM data memory on a 16F84.  Microchip estimates that
> these chips are good for 1,000,000 write/erase cycles.
[Cut]

MicroChip has a PDF-file (21055B.PDF) containing information about the
matter.
Maybe you can find your answer there.

Bear in mind, a xxx write/erase cycle lifetime is _NOT_ the number of
cycles
before some memory-cell fails, but the number of cycles before the numer of
failing erasures/writings exeeds a certain amount.  This means that you can
have itermitently failing cells, but according to MicroChip's
specifications your
EEPROM is still O.K.

(This allso means that you have to check your write-attempt on the EEPROM
and try again if it failed.)

> Thanks!
>
> John Hansen

Greetz,
 Rudy Wieser

1998\03\10@131424 by Mike Keitz

picon face
On Mon, 9 Mar 1998 23:34:01 -0400 John Hansen
<EraseMEhansenspam_OUTspamTakeThisOuToak.ait.fredonia.edu> writes:
>Hi:
>
>   I am working on a program that is going to do a lot of writing
>to the EEPROM data memory on a 16F84.  Microchip estimates that
>these chips are good for 1,000,000 write/erase cycles.  Does
>anyone know what this means?  Does it mean that each byte
>individually is rated for 1,000,000 cycles

Yes, it means exactly that.  Each EEPROM byte wears out independently
from the others.  If you write a small amount of data lots of times, try
to spread it out rather than always writing to the same location.  Also
having multiple copies of the data may allow the program to compensate
for failure of one location.

The rated number of cycles is on the very leading tail of the "bell
curve" (likely not bell-shaped in this case) of the number of cycles
until failure.  Most bytes will last much longer.  A very few will fail
earlier.  I think the explanation from Microchip is that less than 1% of
chips will have 1 or more bytes failed after all bytes have been cycled
the rated number of times.

_____________________________________________________________________
You don't need to buy Internet access to use free Internet e-mail.
Get completely free e-mail from Juno at http://www.juno.com
Or call Juno at (800) 654-JUNO [654-5866]

More... (looser matching)
- Last day of these posts
- In 1998 , 1999 only
- Today
- New search...