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'SRAM 5V 8KB or so'
2009\05\18@082626 by David Duffy (AVD)

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For our open source text messaging system, we need to buffer incoming
and outgoing messages in SRAM, as the lower end  PICs have nowhere near
enough RAM for the application.

Microchip have their SPI 23xx series but only in 1.9V & 3.6V types. What
are others using that's readily available, SPI and not too expensive?
David...

--
___________________________________________
David Duffy        Audio Visual Devices P/L
Unit 8, 10 Hook St, Capalaba 4157 Australia
Ph: +61 7 38235717      Fax: +61 7 38234717
Our Web Site: http://www.audiovisualdevices.com.au
___________________________________________

2009\05\18@094656 by Mauricio Giovagnini

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David Duffy (AVD) escribió:
> For our open source text messaging system, we need to buffer incoming
> and outgoing messages in SRAM, as the lower end  PICs have nowhere near
> enough RAM for the application.
>
> Microchip have their SPI 23xx series but only in 1.9V & 3.6V types. What
> are others using that's readily available, SPI and not too expensive?
> David...
>

Which is your target cost? and how much ram do you need? Is
3.6V a problem? Are you using 5V?

An 18Fxxjxx device costs less than 3 dollars and there are
devices with about 4Kbytes of ram, you can store about 30
messages there if you want to buffer them.  And yes this
pics work at 3.6V

On the other hand you could use FRAM memories (can work at
about 15MHz with and can store data in case of power
failures), they are fast but not very very cheap.

Is just a thought...


--
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Mauricio Giovagnini (Maunix)
http://www.maunix.com.ar
Cordoba, Arg.
LinkedIn Profile: http://www.linkedin.com/in/mgiovagnini

2009\05\18@125446 by M. Adam Davis

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You'll probably find that SPI sram is targetted at small, low power
devices, and as such you'll have a difficult time finding 5V versions.

You might consider using a 3.6V SPI sram, which would require a cheap
regulator. If the tolerances are right, you may be able to use that
with a resistor rather than a full conversion circuit directly to your
PIC.

You'll find the world is largely moving towards 3.6V and lower for
electronics - it might make sense for you to move your whole circuit
down rather than finding new cheap parts that support 5V.

-Adam

On Mon, May 18, 2009 at 8:26 AM, David Duffy (AVD)
<spam_OUTdavidTakeThisOuTspamaudiovisualdevices.com.au> wrote:
{Quote hidden}

>

2009\05\18@184039 by David Duffy (AVD)

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For our open source text messaging system, we need to buffer incoming and outgoing messages in SRAM,
as the lower end  PICs have nowhere near enough RAM for the application.

Microchip have their SPI 23xx series but only in 1.9V & 3.6V types. What are others using that's
readily available, SPI and not too expensive?
David...

--
___________________________________________
David Duffy        Audio Visual Devices P/L
Unit 8, 10 Hook St, Capalaba 4157 Australia
Ph: +61 7 38235717      Fax: +61 7 38234717
Our Web Site: http://www.audiovisualdevices.com.au
___________________________________________


2009\05\18@215950 by Herbert Graf

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On Tue, 2009-05-19 at 08:40 +1000, David Duffy (AVD) wrote:
> For our open source text messaging system, we need to buffer incoming and outgoing messages in SRAM,
> as the lower end  PICs have nowhere near enough RAM for the application.
>
> Microchip have their SPI 23xx series but only in 1.9V & 3.6V types. What are others using that's
> readily available, SPI and not too expensive?

Have you thought of an external EEPROM? Can be very cheap, available in
either SPI or I2C versions, and many at 5V.

TTYL

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