Re: Ramtron FRAM?

Started by Art Church April 4, 2005
I see someone used a FM25W256-S as replacement for the eeprom and it worked fine. I can't see that number on the Ramtron site. I assume the FM25640 would do ?? I would like to use this chip with a BX-35 and use the fast write times and high cycles for temporary logging in the unused portion. Any Advice ?
Art

-----Original Message-----
From: Tom Becker [mailto:gtbecker@gtbe...]
Sent: Mon 4/4/2005 7:44 PM
To: basicx@basi...
Cc:
Subject: RE: [BasicX] Re: Ramtron FRAM?

FRAM works! So far just single byte reads and writes but blocks will be
next. Ye haw! Tom
Tom Becker
--... ...--
GTBecker@GTBe... www.RighTime.com
The RighTime Clock Company, Inc., Cape Coral, Florida USA
+1239 540 5700

Yahoo! Groups Links


> ... the FM25640 [] with a BX-35 and use the [] high cycles...

At the moment, I know only that a trillion cycles will take a very long
time at 2KHz. If fetching p-code, though, it'll be running, maybe, 20
times that rate? Admittedly, a WAG, but that would bring - since reads
also count toward the trillion - the life down to a few years or less of
continuous operation.

Maybe Mike or Don can provide some average fetch rate and you can calc
if it's for your app or not. For data, it should last pragmatically
forever, though, I'd expect, and you can tack it on top of the EEPROM,
still used for code, easily. Tom
Tom Becker
--... ...--
GTBecker@GTBe... www.RighTime.com
The RighTime Clock Company, Inc., Cape Coral, Florida USA
+1239 540 5700



Art,

I used the FM25W256-S with the BX-35 as the sole EEPROM. Here's why
that exact part number doesn't appear on the site.

"New part number FM25256 replaces FM25W256 since operating voltage is
no longer wide (2.7V 5.5V)." The voltage is 4.0 to 5.5 - in the
ballpark.

That's from the .pdf file describing the FM25256. I'd get the 256
chip over the 640 chip so that the full 32kb would be available.

Good luck.

Dennis

--- In basicx@basi..., "Art Church" <achurch@m...> wrote:
> I see someone used a FM25W256-S as replacement for the eeprom and
it worked fine. I can't see that number on the Ramtron site. I assume
the FM25640 would do ?? I would like to use this chip with a BX-35
and use the fast write times and high cycles for temporary logging in
the unused portion. Any Advice ?
> Art >
>
> -----Original Message-----
> From: Tom Becker [mailto:gtbecker@r...]
> Sent: Mon 4/4/2005 7:44 PM
> To: basicx@basi...
> Cc:
> Subject: RE: [BasicX] Re: Ramtron FRAM? >
>
> FRAM works! So far just single byte reads and writes but
blocks will be
> next. Ye haw! > Tom >
> Tom Becker
> --... ...--
> GTBecker@R... www.RighTime.com
> The RighTime Clock Company, Inc., Cape Coral, Florida USA
> +1239 540 5700 >
>
> Yahoo! Groups Links >
>