Dallas Semiconductor has a series of NVRAMs. The DS1225 series are 8KByte
SRAMs with built-in battery backup and control, 70ns - 200ns, standard 28-
pin JEDEC pinout. Battery life over 10 years. There are many others with
RTCCs and some with a multiplex address and data bus. They sell sockets with
all of the above except the SRAM. Pick a suitable SRAM and plug it in.

   - Tom

At 01:42 PM 5/11/99 -0500, you wrote:
>|        I did a program for write on 2864 address a value...(with the
6264 works well :) ), but i
>|not having success..don't write the value!
>
>|        Is there some 2864 model of XICOR or ATMEL or other manufacturer
that accepts fast write
>|cycles...that store information as a 6264...
>
>|        Well, i'm looking for a 2864 that accepts FAST pulses on PIN WR.
(i don't to use an 6264
>|with Battery to store data...). Months ago i did use a XICOR for store
data in my project...but
>|i don't remember more the name?
>
>All 28x64 variants will, I expect, require a multi-operation sequence to
>write data.  I don't think the /WR pulse time will be a problem, but once
>you start a data write you can't read or write anything until the write
>completes sometime later.
>
>You may, however, want to look at http://www.ramtron.com since they make
>some memory devices which are non-volatile but offer speeds comparable to
>somewhat slow static RAMs.  I think they have an 8Kx8 part which could be
>just the ticket.  Do be aware, though, that--since you won't have the sequ-
>encing logic of the 28x64 to protect you from spurious writes--you'll have
>to ensure the /CE and/or /WE are well-protected in case of device power-up
>or power-down.  If that requirement is met, though, those parts could be
>just what you need.