Electronics > Beginners
Replacing NVSRAM chip... external battery modification possible?
james_s:
I've replaced the batteries in a number of those Maxim NVRAMs, it's not the prettiest solution but it does work.
FRAM is great but the DIP parts are long obsolete and hard to find, even with SMT parts it's getting a lot harder to find 5V ones, and parallel memory devices as a whole are really starting to disappear.
David Hess:
--- Quote from: Mp3 on July 04, 2018, 02:28:50 am ---I'm trying to find out if i can use a plain SRAM chip and piggyback a battery holder to the SRAM chip's pins.
Would this be safe/possible? Thank you for your time.
--- End quote ---
It is a little more complicated than that. A supervisory circuit is necessary to monitor the supply voltage and control signals like an MXD1210. In the past, a couple of diodes and CMOS gates or transistors were used for a discrete solution.
FRAM is probably the best option today and usually works as a direct substitute.
AutoStore nvRAM from Cypress would work if you can find a 5 volt one of the proper density but some of them require an external capacitor.
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