We designed a couple products around the Dallas RamPort, which is a
battery backed RAM with built in latches to latch out the addresses. They
then discontinued it. I don't use single sourced Dallas parts any more.
Of course, then Maxim bought Dallas, but I've never had that problem
(yet) with Maxim...

Harold


On Thu, 18 Oct 2001 12:16:02 +0800 SM Ling <piclister@YAHOO.COM> writes:
> > >My microcontroller circuit has a 62256 (32Kx8) RAM chip, which is
> used
> for
> > >storing some important data I want to retain even when the power
> is off.
> > >What is the normal way to retain data on RAM? Is using a battery
> the best
> > >solution? If so, how do I turn on the battery "only" when the
> power is
> off?
>
> Dallas has a RAM chip with built-in battery for exactly this
> purpose.  You
> might want to check it.
>
> Cheers, Ling SM
>
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