A question was asked:

>         Is there a serial RAM device with the same 4 line interface:
>
>         CLK
>         CS
>         DI
>         DO
>
> as Microship's 93LC66 (serial EEPROM)?  I would like to be able to interface
> such a device to a PIC.  I have a 93LC66 interface working already.
> Maybe there is a I*IC device as well.  I would appreciate the info.

Ramtron manufactures what they call FRAM (Ferro-electric RAM). It is
strictly speaking a non-volatile memory, but it's rated at 10 billion
read/write cycles, so one can often use it as normal RAM. It's pin
compatible with Microchip/Atmel/SGS serial-access devices. Prices in
South Africa are very competitive (less than USD1 for 2kbits SO8
package with I2C protocol), but I don't know who the US suppliers
would be, and what the US prices are. Hope this helps.

Cheers,

RI