AVA I L A B L E
AN3 • AN7 • AN8 • AN15 • AN16 • AN25 • AN29
X24C45• AN30 • AN35 • AN36 • AN39 • AN56 • AN69
Serial AUTOSTORE™ NOVRAM
16 x 16 Bit
• AUTOSTORE™ NOVRAM
—Automatically Performs a Store Operation
Upon Loss of VCC
• Single 5 Volt Supply
• Ideal for use with Single Chip Microcomputers
—Minimum I/O Interface
—Serial Port Compatible (COPS™, 8051)
—Easily Interfaced to Microcontroller Ports
• Software and Hardware Control of Nonvolatile
• Auto Recall on Power-Up
• TTL and CMOS Compatible
• Low Power Dissipation
—Active Current: 10mA
—Standby Current: 50µA
• 8-Lead PDIP and 8-Lead SOIC Packages
• High Reliability
—Store Cycles: 1,000,000
—Data Retention: 100 Years
The Xicor X24C45 is a serial 256 bit NOVRAM featuring
a static RAM configured 16 x 16, overlaid bit-by-bit with
a nonvolatile E2PROM array. The X24C45 is fabricated
with Xicor’s Advanced CMOS Floating Gate technology.
The Xicor NOVRAM design allows data to be transferred
between the two memory arrays by means of software
commands or external hardware inputs. A store opera-
tion (RAM data to E2PROM) is completed in 5ms or less
and a recall operation (E2PROM data to RAM) is com-
pleted in 2µs or less.
The X24C45 also includes the AUTOSTORE feature, a
user selectable feature that automatically performs a
store operation when VCC falls below a preset threshold.
Xicor NOVRAMs are designed for unlimited write opera-
tions to RAM, either from the host or recalls from E2PROM
and a minimum 1,000,000 store operations. Inherent data
retention is specified to be greater than 100 years.
AUTOSTORE™ NOVRAM is a trademark of Xicor, Inc.
COPS is a trademark of National Semiconductor Corp.
© Xicor, Inc. 1991, 1995, 1996 Patents Pending
3833-1.5 6/10/96 T3/C3/D0 NS
3833 FHD F01
Characteristics subject to change without notice