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Número de pieza | X24C45PM | |
Descripción | Serial AUTOSTORE NOVRAM | |
Fabricantes | Xicor | |
Logotipo | ||
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No Preview Available ! 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
1 page X24C45
Figure 1. RAM Read
CE
SK 1 2 3 4 5 6 7 8 9 10 11 12 22 23 24
DI 1 A A A A 1 1 X*
HIGH Z
DO
*Bit 8 of Read Instructions is Don’t Care
Figure 2. RAM Write
CE
D0 D1 D2 D3 D13 D14 D15 D0
3833 FHD F09.1
SK 1 2 3 4 5 6 7 8 9 10 11 21 22 23 24
DI 1 A A A A 0 1 1 D0 D1 D2 D12 D13 D14 D15
3833 FHD F10.1
Figure 3. Non-Data Operations
CE
SK 1 2 3 4 5 6 7 8
DI 1 X X X X I2 I1 I0
3833 FHD F11.1
5
5 Page X24C45
AUTOSTORE Cycle Limits
Symbol
Parameter
tASTO
VASTH
VASEND
AUTOSTORE Cycle Time
AUTOSTORE Threshold Voltage
AUTOSTORE Cycle End Voltage
AUTOSTORE Cycle Timing Diagrams
Min.
4.0
3.5
Max.
5
4.3
5 VCC
4 AUTOSTORE CYCLE IN PROGRESS VASTH
3 VASEND
2
tASTO
1 STORE TIME
TIME (ms)
VASTH
0V
AS
VCC
tPUR
tASTO
tPUR
Units
ms
V
V
3833 PGM T13.1
3833 FHD F08
SYMBOL TABLE
WAVEFORM INPUTS
OUTPUTS
Must be
steady
May change
from LOW
to HIGH
May change
from HIGH
to LOW
Don’t Care:
Changes
Allowed
N/A
Will be
steady
Will change
from LOW
to HIGH
Will change
from HIGH
to LOW
Changing:
State Not
Known
Center Line
is High
Impedance
11
11 Page |
Páginas | Total 14 Páginas | |
PDF Descargar | [ Datasheet X24C45PM.PDF ] |
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