[sdiy] RAM CCD

[James Patchell]

I designed a product many years ago that used four of the 6116P on the 
board (and not the LP version).  The cards would be tested and then put in 
a box for later assembly into the final machine.  After several months, the 
data would still be in the ram....and this was just a single 10uF 
cap...when the units were shipped, battery backup was a pair of AAA cells, 
still, I was amazed at the fact that a small cap could keep the data in 
those rams...

At 08:05 AM 1/26/2005 +1100, Ken Stone wrote:
> >Yep, that's right. To replace a 2112 (or two), it should be possible to
> >do some stripboard hack using a 6116 at a pinch.
> >Address In, common Data I/O, WR, CE - it's all there.
>
>Actually, I had a couple of these 2112 kicking around. I wonder what I did 
>with
>them.
>
> >D4016D looks like NEC, meaning uPD4016D. Sometimes NEC had a different
> >numbering scheme than the rest of the world. Found nothing about that
> >one though. My 1979 NEC book appears to be too fresh for that...
>
>Already posted on this one. Its an NMOS variant of the 6116 for all
>practical intents and purposes.
>
>Also a couple of times I've mentioned using 6116P as battery backed up ram
>and getting at least 15 years out of the batteries (AAA drycells) keeping
>the data intact. ANd each time I have, someone has "corrected" me saying
>6116LP. So let me take this opportunity to state emphatically that they are
>6116P - NOT the low power ones. Even the regular ones draw little current.
>
>As for the NMOS variants, it is a different matter entirely. I forget the
>part number, but it was a pin for pin drop-in for the 6116, and it GUZZLED
>current.
>
>Ken
>_______________________________________________________________________
>Ken Stone   sasami at hotkey.net.au or sasami at cgs.synth.net
>Modular Synth PCBs for sale <http://www.blaze.net.au/~sasami/synth/>
>Australian Miniature Horses & Ponies <http://www.blaze.net.au/~sasami/>

         -Jim
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