> Date: Thu, 22 Jun 1995 12:24:57 -0700 > From: Brad Morrow > Subject: Non-Volatile RAM for I2C. > > 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 stor e > individual parameters, requiring modifying single locations. > > Does anybody know of companies that have such a product? > > -------------------------------------------------------------------------- > Brad Morrow Advanced Systems Group > Product Design e-mail: morrow@asd.sgi.com > Silicon Graphics, Inc. voice-mail: (415)390-1311 > 2011 N. Shoreline Blvd. fax: (415)961-9075 > Mountain View, CA 94039-7311 > -------------------------------------------------------------------------- RAMTRON makes I2C serial FRAM parts (and SPI parts, too) in 512- and 2K-byte sizes; the I2C parts run at 100 or 400KHz with NO WRITE WAIT. Well, maybe you aren't in a hurry, but it saves a few lines of code not to have to poll for the ``done'' status from those SLOW EEPROM parts, and it's also nice to be able to swallow 115200bps serial data into nonvolatile buffer memory. Oh, did I mention endurance of 10^10 (10 billion) read or write cycles, and 100uA (microamps) write current? (FRAM is ``ferroelectric RAM'' -- please don't let the ``ferro'' confuse you -- it's not a magnetic phenomenon; there's nothing ferrous involved; it's a polar dielectric effect with hysteresis which is analogous to ferromagnetism). Ramtron is in Colorado Springs, Colorado: (719)481-7000; US:(800)545-FRAM; Fax:(719)488-9095. Peter F. Klammer, Racom Systems Inc. PKlammer@ACM.Org 6080 Greenwood Plaza Boulevard (303)773-7411 Englewood, CO 80111 FAX:(303)771-4708