I found serial rams from Ramtron, www.ramtron.com. They go upto 16kbit are
nonvolatile, but have no write cycle delay and are good for 10 million
writes. I have not used them other than tests.  Has anyone comments? I
think the part cost on 1-off is around $3-5

Geoff.

>> 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
>