Check out FRAM. It's non-volatile RAM without any energy source. Sort of
like EEPROM but without the write delay. There are versions that are pin
compatible with an 62256. I'm about to experiment with their serial 8Kx8
chip.

Joris.

----- Original Message -----
From: SM Ling <piclister@YAHOO.COM>
To: <PICLIST@MITVMA.MIT.EDU>
Sent: Thursday, October 18, 2001 6:16 AM
Subject: Re: [EE]: How to retain RAM data when power is off?


> > >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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