> I need non-volatile RAM for a PIC based design.  Because of size restraints I
> would prefer it interfaced on the I2C bus.  Also, the RAM will be used to
 store
> individual parameters, requiring modifying single locations.
>
> Does anybody know of companies that have such a product?

If you can stand EEPROM rather than pure RAM, Microchip also manufactures
them, check their www. Other are Xicor and Phillips.
They behave as normal RAM - you can write single byte to them,then  read.
 They are probably a bit slow on writing (I2C acknowledgement is used
 to slow master down), and number of writes is limited to about 10mln per
any byte.


Jarek.