X24C45 Datasheet, PDF (1/12 Pages) Xicor Inc. – Serial AUTOSTORE™ NOVRAM

®
Data Sheet
June 1, 2005
X24C45
256 Bit, 16 x 16 Bit
FN8104.0
Serial AUTOSTORE™ NOVRAM
FEATURES
• AUTOSTORE NOVRAM
—Automatically performs a store operation
upon loss of V_CC
• Single 5V 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
IBLOCK DIAGRAM
DESCRIPTION
The Intersil X24C45 is a serial 256-bit NOVRAM featur-
ing a static RAM configured 16 x 16, overlaid bit-by-bit
with a nonvolatile EEPROM array. The X24C45 is fabri-
cated with Intersil’s Advanced CMOS Floating Gate
technology.
The Intersil NOVRAM design allows data to be trans-
ferred between the two memory arrays by means of
software commands or external hardware inputs. A
store operation (RAM data to EEPROM) is completed
in 5ms or less and a recall operation (EEPROM data to
RAM) is completed 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.
Intersil 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.
Inherent data retention is specified to be greater than
100 years.
Row
Decode
Nonvolatile
EEPROM
Static
RAM
256-Bit
STORE
RECALL
Control
Logic
RECALL (6)
AS (7)
CE (1)
DI (3)
SK (2)
Instruction
Register
Instruction
Decode
4-Bit
Counter
Column
Decode
DO (4)
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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