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DS3803 Datasheet

  • DS3803

  • 1024k Flexible NV SRAM SIMM

  • 10頁

  • DALLAS   DALLAS

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DS3803
1024k Flexible NV SRAM SIMM
www.dalsemi.com
FEATURES
Flexibly organized as 32k x 32, 64k x 16 or
128k x 8bits
10 years minimum data retention in the
absence of external power
Nonvolatile circuitry transparent to and
independent from host system
Automatic write protection circuitry
safeguards against data loss
Separate control and data signals for each
SRAM allow byte, word or doubleword
access
Fast access time of 70 ns
Full V
CC
鹵 10% operating range
Employs popular JEDEC standard 72-position
SIMM connector
Extremely thin design built using TSOP-
package IC components
PIN ASSIGNMENT
1
256K
SRAM
256K
SRAM
256K
SRAM
256K
SRAM
DS3803 72-Pin SIMM
PIN DESCRIPTION
A0 - A14
D0A - D7A
D0B - D7B
D0C - D7C
D0D - D7D
CEA
-
CED
WEA
-
WED
OEA
-
OED
VCC
GND
NC
-
-
-
-
-
-
-
-
-
-
-
Address Inputs
Data Inputs/Outputs, Byte A
Data Inputs/Outputs, Byte B
Data Inputs/Outputs, Byte C
Data Inputs/Outputs, Byte D
Chip Enable Inputs
Write Enable Inputs
Output Enable Inputs
+5V Power Supply
Ground
No Connect
72
DESCRIPTION
The DS3803 is a self-contained, 1,048,576-bit, nonvolatile static RAM which can be flexibly organized
as 32k x 32, 64k x 16 or 128k x 8. Built using four 32k x 8 SRAMs, four nonvolatile control ICs and four
lithium batteries, this nonvolatile memory contains all necessary control circuitry and lithium energy
sources to maintain data integrity in the absence of power for more than 10 years. The DS3803 employs
the popular JEDEC standard 72-position SIMM connection scheme and requires no additional circuitry.
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