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PICList Thread
'[EE] 3V, fast I2C memory'
2005\09\14@063929 by Vasile Surducan

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Hi piclisters,

I need a fast 3V, 512kb (or 1Mb) serial (preferable I2C memory).
I found 24FC512, with 5mS write cicle. Do you know something available
with a faster writting cycle ? Maybe a serial SRAM ?

thank you,
Vasile

2005\09\14@080005 by Mike Harrison

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On Wed, 14 Sep 2005 13:39:29 +0300, you wrote:

>Hi piclisters,
>
>I need a fast 3V, 512kb (or 1Mb) serial (preferable I2C memory).
>I found 24FC512, with 5mS write cicle. Do you know something available
>with a faster writting cycle ? Maybe a serial SRAM ?
>
>thank you,
>Vasile

You may find faster parts in SPI - e.g. ST M25P serial flash parts - 256 byte page write in 1.5ms
Beware long erase times though.


2005\09\14@082425 by Michael Rigby-Jones

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>-----Original Message-----
>From: spam_OUTpiclist-bouncesTakeThisOuTspammit.edu [.....piclist-bouncesKILLspamspam@spam@mit.edu]
>Sent: 14 September 2005 11:39
>To: Microcontroller discussion list - Public.
>Subject: [EE] 3V, fast I2C memory
>
>
>Hi piclisters,
>
>I need a fast 3V, 512kb (or 1Mb) serial (preferable I2C
>memory). I found 24FC512, with 5mS write cicle. Do you know
>something available
>with a faster writting cycle ? Maybe a serial SRAM ?
>
>thank you,
>Vasile

FRAM is the way to go for fast (zero wait) writes:

http://www.ramtron.com/doc/Products/serial.asp

Regards

Mike

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2005\09\14@083329 by Stef Mientki

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hi Vasile,

look for ferro ram, e.g.
www.ramtron.com/doc/Products/overview.asp
they are really fast: no write delay !!

cheers,
Stef


Vasile Surducan wrote:

{Quote hidden}

2005\09\14@083817 by Marc Nicholas

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I'm waiting for some samples right now of both the I2C and SPI...can't
wait as lots of people see to say good things about the Ramtron parts! :-)

-marc

On Wed, 14 Sep 2005, Stef Mientki wrote:

{Quote hidden}

> --

2005\09\14@101745 by Bob Axtell

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Vasile Surducan wrote:

>Hi piclisters,
>
>I need a fast 3V, 512kb (or 1Mb) serial (preferable I2C memory).
>I found 24FC512, with 5mS write cicle. Do you know something available
>with a faster writting cycle ? Maybe a serial SRAM ?
>
>thank you,
>Vasile
>
>  
>
I think you are not studying the specs closely. For the 24LC512, the 5mS
is MAX; I  get
about 3mS normally.

The other thing is that you can place 128 bytes into a write buffer so
that 3mS is needed
for the whole 128 bytes. So It writes faster than you think.

If you have room, use two RAMTRON SPI memories, they are 32Kx8 each, so
you can reach
65K without ANY waits to flash the parts.

--Bob

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