[sdiy] uPD444 RAM battery power

Adam Inglis 21pointy at tpg.com.au
Fri May 29 06:40:56 CEST 2015


This CR-8000 I'm working on uses this CMOS static RAM. The machine has  
a battery compartment for 3 x 1.5 volts AA batteries to retain data.
I would like to replace this with a CR2032 lithium battery or similar  
to make space for mods.
The datasheet for the RAM says data retention voltage min = 2 volts,  
current 0.01 microA.
The battery power line has diode protection from reverse voltage via  
the 5 volt line.

Any foreseen problems doing that?

cheers
Adam



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