Electronics > Repair

Has anyone replaced HP8591(E) SRAM by FRAM?

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Greybeard:
Has anyone tried to replace HP8591(E) SRAM by FRAM?
I want to get rid of the damn lithium battery holding calibration data in SRAM.

Miti:
I haven’t seen one but it’s an awesome idea. I have an 8594E and I replaced the battery few years ago.
We would need a 256k x 16 FRAM, probably 4 level translator chips, there are no 256k 5V chips, a 3.3V regulator and couple more gates. I can’t find the connector part number.

Cheers,
Miti

Edit: There is an old model of memory board and a new one. I have the new type.

Greybeard:
I don't know if my memory board is new or old but it's the same as described in the attached pdf.

squadchannel:
FM16/18 cannot be used without circuit modification due to differences in CE pin control. (See the datasheet for details.)
FM28V is improved in this respect and fully compatible with SRAM, but it is 3.3V instead of 5V.

I used TI LSF0108/0204. confirmed that it works with DALLAS NVRAM, and it should work with SRAM as well. :popcorn:

Miti:
@Greybeard. That is the new style.
@squadchannel. Take a look at FM22L16. It is drop in replacement for SRAM, no multiple CE toggle rubbish, and I happen to have a hand full of them.
There’s also non volatile SRAM option and they are cheaper. They use QuantumTrap nonvolatile elements ??? and they save the content at power down.

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