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Xicor - Serial Nonvolatile Static RAM

Numéro de référence X24C44SI
Description Serial Nonvolatile Static RAM
Fabricant Xicor 
Logo Xicor 





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X24C44SI fiche technique
APPLICATION NOTES
AVA I L A B L E
AN3 • AN7 • AN8 • AN15 • AN16 • AN25 • AN29
X24C44• AN30 • AN35 • AN36 • AN39 • AN56 • AN69
256 Bit
X24C44
Serial Nonvolatile Static RAM
16 x 16 Bit
FEATURES
Advanced CMOS Version of Xicor’s X2444
16 x 16 Organization
Single 5 Volt Supply
Ideal for use with Single Chip Microcomputers
—Static Timing
—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 Maximum
—Standby Current: 50µA Maximum
8-Lead PDIP, Cerdip, and 8-Lead SOIC Packages
High Reliability
—Store Cycles: 1,000,000
—Data Retention: 100 Years
DESCRIPTION
The Xicor X24C44 is a serial 256 bit NOVRAM featuring
a static RAM configured 16 x 16, overlaid bit-by-bit with
a nonvolatile E2PROM array. The X24C44 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.
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
NONVOLATILE
E2PROM
ROW
DECODE
STATIC
RAM
256-BIT
CONTROL
LOGIC
RECALL (6)
STORE (7)
CE (1)
DI (3)
SK (2)
INSTRUCTION
REGISTER
INSTRUCTION
DECODE
COLUMN
DECODE
4-BIT
COUNTER
COPS is a trademark of National Semiconductor Corp.
© Xicor, Inc. 1991, 1995, 1996 Patents Pending
3832-1.5 6/19/96 T2/C1/D1 NS
1
DO (4)
3832 FHD F01
Characteristics subject to change without notice

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