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'Serial RAM'
1995\09\15@024849 by mlk

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Hello,

       Is there a serial RAM device with the same 4 line interface:

       CLK
       CS
       DI
       DO

as Microship's 93LC66 (serial EEPROM)?  I would like to be able to interface
such a device to a PIC.  I have a 93LC66 interface working already.
Maybe there is a I*IC device as well.  I would appreciate the info.

Thanks,

Martin Kirk
Arizona State University
spam_OUTmlkTakeThisOuTspamasu.edu
(602) 582-5718

1995\09\15@032035 by divanov

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face
A question was asked:

>         Is there a serial RAM device with the same 4 line interface:
>
>         CLK
>         CS
>         DI
>         DO
>
> as Microship's 93LC66 (serial EEPROM)?  I would like to be able to interface
> such a device to a PIC.  I have a 93LC66 interface working already.
> Maybe there is a I*IC device as well.  I would appreciate the info.

Ramtron manufactures what they call FRAM (Ferro-electric RAM). It is
strictly speaking a non-volatile memory, but it's rated at 10 billion
read/write cycles, so one can often use it as normal RAM. It's pin
compatible with Microchip/Atmel/SGS serial-access devices. Prices in
South Africa are very competitive (less than USD1 for 2kbits SO8
package with I2C protocol), but I don't know who the US suppliers
would be, and what the US prices are. Hope this helps.

Cheers,

RI

1995\09\15@054721 by David Warman

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In message <.....199509150821.JAA25985KILLspamspam@spam@listserv.rl.ac.uk>, divanovspamKILLspamplessey.co.za wri
tes:
>Ramtron manufactures what they call FRAM (Ferro-electric RAM). It is
>strictly speaking a non-volatile memory, but it's rated at 10 billion
>read/write cycles, so one can often use it as normal RAM. It's pin
>compatible with Microchip/Atmel/SGS serial-access devices. Prices in
>South Africa are very competitive (less than USD1 for 2kbits SO8
>package with I2C protocol), but I don't know who the US suppliers
>would be, and what the US prices are. Hope this helps.

I rather like the look of these - so I did a little investigating

Ramtron have their WWW pages at URL:
       http://www.csn.net/ramtron

which include Postscript data sheets for these things.  (They are
a little large, and I'm having a little trouble downloading them at
the moment - though that might be the local web proxy).

Apparently they're based in Colorado Springs, so they have plenty
of US suppliers.  They've even got a couple in the UK.  List is at:
       http://www.csn.net/ramtron/repdisti.html

It's nice to see a company that puts the data sheets online _before_
they do the all the usual 'corporate' stuff ;-) [Which is still listed
as 'under construction' at the moment.]

Dave.


'Serial RAM'
1997\07\21@133406 by Bill Collins
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Does anyone know of any serial RAM chips?  This is for a new design, so
the specific serial protocol is not important.

Bill

1997\07\21@141509 by John Shreffler

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part 0 330 bytes
John Shreffler
New Directions

-----Original Message-----
From:   Bill Collins [SMTP:.....collinsKILLspamspam.....IEPGROUP.COM]
Sent:   Monday, July 21, 1997 1:35 PM
To:     EraseMEPICLISTspam_OUTspamTakeThisOuTMITVMA.MIT.EDU
Subject:        Serial RAM

Does anyone know of any serial RAM chips?  This is for a new design, so
the specific serial protocol is not important.

Bill

1997\07\21@162053 by Harold Hallikainen

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On Mon, 21 Jul 1997 13:34:36 -0400 Bill Collins <collinsspamspam_OUTIEPGROUP.COM>
writes:
>Does anyone know of any serial RAM chips?  This is for a new design,
>so
>the specific serial protocol is not important.
>
>Bill
>


       I looked and looked for serial RAM a few months ago.  Couldn't
find any.  found LOTS of serial EEPROM.  I've ended up using the Dallas
RamPort in two products now.  It's a 2 Kbyte RAM that interfaces to the
microcontroller with 11 wires (port pins).  It reproduces 8 wires as port
pins, so you lose only three pins, about the same as serial RAM (if it
exists).
       One strange thing...  We got samples from Dallas fine, but now
distributors are saying it's only available in Europe...

Harold

1997\07\21@165824 by Jeff Dickson

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----
From: Harold Hallikainen <@spam@haroldhallikainenKILLspamspamJUNO.COM>
To: KILLspamPICLISTKILLspamspammitvma.mit.edu
Date: Monday, July 21, 1997 1:21 PM
Subject: Re: Serial RAM
>
>        I looked and looked for serial RAM a few months ago.  Couldn't
>find any.  found LOTS of serial EEPROM.  I've ended up using the Dallas
>RamPort in two products now.  It's a 2 Kbyte RAM that interfaces to the
>microcontroller with 11 wires (port pins).  It reproduces 8 wires as port
>pins, so you lose only three pins, about the same as serial RAM (if it
>exists).

Harlod,

Check out the PCF8570 from Philips.  256 X 8 Serial static RAM on the I2C
bus.
Not cheap however.

PDF Datasheet:  http://www.semiconductors.philips.com/acrobat/3041.pdf


-jeff

1997\07\22@012553 by tjaart

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> Does anyone know of any serial RAM chips?  This is for a new design, so
> the specific serial protocol is not important.
>
> Bill

Depends on the size. If you only need a few hundred bytes, and can do
with
a real time clock, the 8583 I2C RTC from Philips is a nice part to use.

--
Friendly Regards

Tjaart van der Walt
RemoveMEtjaartTakeThisOuTspamwasp.co.za
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1997\07\22@023310 by wterreb

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<spamBeGonecollinsspamBeGonespamIEPGROUP.COM> writes:
> >Does anyone know of any
>>serial RAM chips?  This is for a new design, so the
>>specific serial protocol is not important.

Harold Hallikainen <TakeThisOuTharoldhallikainenEraseMEspamspam_OUTJUNO.COM> wrote:

>        I looked and looked for serial RAM a few months
>        ago.  Couldn't
> find any.  found LOTS of serial EEPROM.  I've ended up
> using the Dallas RamPort in two products now.  It's a 2
> Kbyte RAM that interfaces to the microcontroller with 11
> wires (port pins).  It reproduces 8 wires as port pins,
> so you lose only three pins, about the same as serial
>RAM (if it exists).

I wrote:

Bill

  Ramtron makes a 8 pin I2C serial ram device called FRAM.  It is
pin and code compatible with normal serial EEPROMs, but with the
speed of a RAM device.   It behaves exactly like you would expect from
a non-volatile serial RAM.  I know Ramtron have a website with
datasheets somewhere, and you should easily find it by doing a search
on the web.

Rgds
Werner
--
Werner Terreblanche     users.iafrica.com/w/we/wernerte/index.htm
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