X24C45 Datasheet, PDF (1/14 Pages) Xicor Inc. – Serial AUTOSTORE™ NOVRAM

APPLICATION NOTES
AVA I L A B L E
AN3 • AN7 • AN8 • AN15 • AN16 • AN25 • AN29
X24C45 ^{• AN30 • AN35 • AN36 • AN39 • AN56 • AN69}
256 Bit
X24C45
Serial AUTOSTORE™ NOVRAM
16 x 16 Bit
FEATURES
• AUTOSTORE™ NOVRAM
—Automatically Performs a Store Operation
Upon Loss of V_CC
• 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
Functions
• 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
DESCRIPTION
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 V_CC 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.
FUNCTIONAL DIAGRAM
ROW
DECODE
NONVOLATILE
E2PROM
STATIC
RAM
256-BIT
STORE
RECALL
CONTROL
LOGIC
RECALL (6)
AS (7)
CE (1)
DI (3)
SK (2)
INSTRUCTION
REGISTER
INSTRUCTION
DECODE
COLUMN
DECODE
4-BIT
COUNTER
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
1
DO (4)
3833 FHD F01
Characteristics subject to change without notice