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SRAM to NVRAM — Parallax Forums

SRAM to NVRAM

nicolad76nicolad76 Posts: 164
edited 2013-07-29 03:58 in General Discussion
Hi,
for a while I have been looking for a nice solution involving NVRAM but...it is too much expensive.....
I was thinking of using some SRAM and pair a rechargable battery to keep the SRAM chips powered. Since I am not really a tech-guru I was wondering:
The chip I have in mind for SRAM is CY7C1019DV33-10ZSXI

1) do you have any suggestion?
2) do you know if anyone else have tried already....I would like to see some reference material....

Thanks!!!
Nicola

Comments

  • mikedivmikediv Posts: 825
    edited 2009-01-12 19:55
    Very interesting chip, cheap to . I am not sure what you want to us ehtis with. prop chip stamp, cpu??
    but can I ask why not Eprom? if your looking for the speed then yes S-ram would be the ticket have you ever looked at the Zeus NV-Sram I have that working with the BS2
  • RobotWorkshopRobotWorkshop Posts: 2,307
    edited 2009-01-12 20:07
    Another option to standard NVRAM chips are the ones made by SIMTEK. They have some drop in replacements for popular SRAM chips and so far they seem to work great in the projects I have used them in. You can check them out at:

    http://www.simtek.com/

    Robert
  • nicolad76nicolad76 Posts: 164
    edited 2009-01-12 23:18
    I was looking for a cheap solution. I couldn't find the price for those you guys have mentioned.
    At the beginning I was going to use that memory just as video memory then Ithought that it would be great not to lose the info I have stored in.
    Thanks for your sugestions
  • kwinnkwinn Posts: 8,697
    edited 2009-01-13 14:13
    A small battery and a couple of diodes should be all you need to retain data on this chip. The info required is on the data sheet.
  • jag87jag87 Posts: 2
    edited 2013-06-27 17:00
    Robert, this is the board with SIMTEK chip used in the system. To activate Write command on Power Down (OFF) the HSB and W pin must go low and if the writing is not performed the SIMTEK chip is bad? In case the pin W is not activated to correct state by NEC chip is it possible to bypass it and unsolder pin W which is 27 from the board and make a pull up by 10k resistor to +5V DC and force the writing to eeprom?
    SIMTEK_board_arrangement.jpg
    1024 x 768 - 104K
  • jag87jag87 Posts: 2
    edited 2013-07-29 03:58
    The problem has been fixed.
    Apparently SIMTEK chip was damaged and after replacement the device is working as before.
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