512 x 8 Bit
Nonvolatile Static RAM
• High reliability
—Endurance: 1,000,000 nonvolatile store
—Retention: 100 years minimum
• Power-on recall
—EEPROM data automatically recalled into
SRAM upon power-up
• Lock out inadvertent store operations
• Low power CMOS
• Inﬁnite EEPROM array recall, and RAM read and
• Compatible with X2004
The Xicor X20C04 is a 512 x 8 NOVRAM featuring a
static RAM overlaid bit-for-bit with a nonvolatile electri-
cally erasable PROM (EEPROM). The X20C04 is fabri-
cated with advanced CMOS ﬂoating gate technology
to achieve low power and wide power-supply margin.
The X20C04 features the JEDEC approved pinout for
byte-wide memories, compatible with industry stan-
dard RAMs, ROMs, EPROMs, and EEPROMs.
The NOVRAM design allows data to be easily transferred
from RAM to EEPROM (store) and EEPROM to RAM
(recall). The store operation is completed in 5ms or less
and the recall operation is completed in 5µs or less.
Xicor NOVRAMS are designed for unlimited write
operations to RAM, either from the host or recalls from
EEPROM, and a minimum 1,000,000 store operations
to the EEPROM. Data retention is speciﬁed to be
greater than 100 years.
REV 1.0 6/21/00
512 x 8
Characteristics subject to change without notice. 1 of 15