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PDF X24C44P Data sheet ( Hoja de datos )

Número de pieza X24C44P
Descripción Serial Nonvolatile Static RAM
Fabricantes Xicor 
Logotipo Xicor Logotipo



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No Preview Available ! X24C44P Hoja de datos, Descripción, Manual

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

1 page




X24C44P pdf
X24C44
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
3832 FHD F07.1
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
3832 FHD F08.1
Figure 3. Non-Data Operations
CE
SK 1 2 3 4 5 6 7 8
DI 1 X X X X I2 I1 I0
3832 FHD F09.1
5

5 Page





X24C44P arduino
X24C44
STORE CYCLE LIMITS
Symbol
tST
tSTP
tZ
VCC
Parameter
Store Time
Store Pulse Width
CE to Output in High Z
Store Inhibit
Store Timing
Min.
200
Typ.(7)
2
3
Max.
5
1
Units
ms
ns
µs
V
3832 PGM T12
CE
STORE
DO
tSTP
tST
tZ
HIGH Z
3832 FHD F06
Note: (7) Typical values are for TA = 25°C and nominal supply voltage.
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

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