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X24C45 Datasheet Preview

X24C45 Datasheet

Serial AUTOSTORE NOVRAM

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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 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
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
FUNCTIONAL DIAGRAM
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 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.
NONVOLATILE
E2PROM
ROW
DECODE
STATIC
RAM
256-BIT
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




Xicor

X24C45 Datasheet Preview

X24C45 Datasheet

Serial AUTOSTORE NOVRAM

No Preview Available !

X24C45
PIN DESCRIPTIONS
Chip Enable (CE)
The Chip Enable input must be HIGH to enable all read/
write operations. CE must remain HIGH following a
Read or Write command until the data transfer is com-
plete. CE LOW places the X24C45 in the low power
standby mode and resets the instruction register. There-
fore, CE must be brought LOW after the completion of an
operation in order to reset the instruction register in
preparation for the next command.
Serial Clock (SK)
The Serial Clock input is used to clock all data into and
out of the device.
Data In (DI)
Data In is the serial data input.
Data Out (DO)
Data Out is the serial data output. It is in the high
impedance state except during data output cycles in
response to a READ instruction.
AUTOSTORE Output (AS)
AS is an open drain output which, when asserted indi-
cates VCC has fallen below the AUTOSTORE threshold
(VASTH). AS may be wire-ORed with multiple open drain
outputs and used as an interrupt input to a microcontroller
or as an input to a low power reset circuit.
RECALL
RECALL LOW will initiate an internal transfer of data
from E2PROM to the RAM array.
PIN CONFIGURATION
DIP/SOIC
CE 1
8 VCC
SK 2
7 AS
X24C45
DI 3
6 RECALL
DO 4
5 VSS
PIN NAMES
Symbol
CE
SK
DI
DO
RECALL
AS
VCC
VSS
3833 FHD F02.1
Description
Chip Enable
Serial Clock
Serial Data In
Serial Data Out
Recall Input
AUTOSTORE Output
+5V
Ground
3833 PGM T01
2


Part Number X24C45
Description Serial AUTOSTORE NOVRAM
Maker Xicor
Total Page 14 Pages
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