That would be an interesting solution but they're actually a different lithium chemistry.? An iron disulfide cathode gives the 1.5 volt cell voltage:
Peter
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On 3/24/2019 11:47 AM, Chuck Harris wrote:
As far as I know the 1.5V lithium AA cells are a hybrid between
a LDO power regulator, set to 1.5V and a 3V lithium cell of some
sort. The few I have found put out somewhere around 1.8V unloaded,
and drop back to 1.5 under load. I have been meaning to open one up.
I am not sure how they would hold up under a no current draw situation
like backing up a CMOS RAM.
-Chuck Harris
Peter Gottlieb wrote:
And they seem to be getting worse all the time.
What about those new lithium 1.5 volt AA cells? Very long shelf life and I have yet to see one leak. Seems like an ideal choice for memory backup.
Peter
On Mar 24, 2019, at 10:45 AM, Daun Yeagley <daun@...> wrote:
I couldn't agree more! I've had *terrible* experiences with alkaline cells leaking.
Daun
On 3/24/2019 10:25 AM, Chuck Harris wrote:
I suggest in the strongest terms, do NOT use alkaline
cells in any memory backup scheme. They will leak out
their electrolyte long before they run out the necessary
power to run the backup scheme.
I have done this experiment too many times, and lost too
much equipment to the damage the alkaline cells have done.
If you simply must use alkalines, put them on a long leash
and mount them outside of the instrument.
-Chuck Harris
Jack2015 wrote:
Usually there are three parts in a NVRAM,
1.SRAM
2.DS1210(or DS121x?)
3. 3V battery
This means we can make NVRAM by ourself,
HM6116+DS1210+two 1.5V AAA batteries=DS1220Y(2Kx8 NVRAM)
one 256K SRAM+DS1210+two 1.5V AA batteries(or one 3V battery)=DS1230Y=M48Z35Y 32kx8 NVRAM,
couple years ago I made following NVRAM for tek 11A32,last week I replaced the HM6116 with a 256K SRAM
and used it in CSA803(for a M48Z35Y=DS1230Y).it works well.by using larger capacity battery the life of data
storage will be much much longer!
Attachments:
NVRAM.jpg: /g/HP-Agilent-Keysight-equipment/attachment/95351/0
--
Daun E. Yeagley II, N8ASB
