At 08:02 PM 6/05/98 -0700, you wrote:
>Does anyone know of a serial static RAM I could use for additional PIC
>data memory?  I am attempting to alter a pre-existing design that uses
>93C66 EEPROMs, so something with the same pinout and bit-banging scheme
>would be nice, although not absolutely necessary.  I don't care whether
>the SRAM is volatile or not.
>
>The only firm requirements are three pin interface, minimum 64 bytes RAM
>per chip (bigger is better), and no write cycle limitations like those
>associated with EEPROM and FLASH.
>
>Bonuses would be:
>     256 bytes per chip
>     nonvolatile
>     8 pin package with pinout similar to 93C66 EEPROM
>
>I have searched extensively already, and all that I've found are some
>XICOR non-volatile SRAMs that aren't large enough, and a variety of
>parallel parts (including the Dallas RAMPort).  It seems like something
>like this should exist.  Am I missing something obvious?
>
>Oh, I also spoke with a Microchip tech support guy who told me he's had
>the same problem and was also unable to find a solution.
>
>Any help would be greatly appreciated!
>
>Jason Harris
>
>

If I remember correctly, Philips had an I2C SRAM or around 256 bytes. Your
other option is shift registers, or perhaps another PIC

Dennis