[sdiy] uPD444 RAM battery power

Ullrich Peter Peter.Ullrich at kapsch.net
Fri May 29 10:43:47 CEST 2015

The standby current of this RAM is not 10nA - this would make every user happy - it is 1uA.
See: http://www.pisi.com.pl/piotr433/manuals/upd444.pdf

But the voltage drop at 1µA is also not 1V at this low current.


-----Ursprüngliche Nachricht-----
Von: synth-diy-bounces at dropmix.xs4all.nl [mailto:synth-diy-bounces at dropmix.xs4all.nl] Im Auftrag von mskala at ansuz.sooke.bc.ca
Gesendet: Freitag, 29. Mai 2015 10:26
An: rsdio at audiobanshee.com
Betreff: Re: [sdiy] uPD444 RAM battery power

On Fri, 29 May 2015, rsdio at audiobanshee.com wrote:
> Another thing is the forward voltage drop of the protection diode, 
> assuming it's in series with the battery output. If the drop is 1.0 V 
> or more then you won't meet the minimum voltage of the SRAM. There are 

Not many diodes will drop 1V at 10nA.

Matthew Skala
mskala at ansuz.sooke.bc.ca                 People before principles.
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