MRAM Serial access

[renatocosfer]

Is there any plan to improve a  I2C/SPI   MRAM  to use with low pin-out microcontrollers ? 

[bigmac]

Hello,

Please refer to the following post to see whether it provides the information you need.

http://forums.freescale.com/freescale/board/message?board.id=8BITCOMM&message.id=4554

Regards,

Mac

[renatocosfer]

Thanks BIGMAC.

I was searching for this 2 options sometime:

-Nanoamp: Serial SRAM / 32kB / ultra low power back up supply, and

-Ramtron : FRAM

Well, about FRAM I was understanding that it has a limited number of read-write cycles, same

as Flash, but now I see on datasheets that it is "unlimeted" number of cycles.

So, it´s an option. Ramtron has up to 64kB/8 pin devices.

[renatocosfer]

The issue are:

- FRAM is expensive yet :  64kB ~  $10

- Some papers inform that number of read-write cycles are ~ 1,000,000,000,000 times.

 Comments ?

[rocco]

Hi Renatocosfer,

---

renatocosfer wrote:

- Some papers inform that number of read-write cycles are ~ 1,000,000,000,000 times.

---

I had not heard this before, so I wrote a little test program. The program writes/reads every millisecond, for 1000 cycles per second. I will let you know the results in about 32 years. 

[renatocosfer]

Ok Rocco:

Virtually unlimited so, if that´s right. 

With 100,000 times the massive read-write cycles is not possible.