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PDF DS3803 Data sheet ( Hoja de datos )
| Número de pieza | DS3803 | |
| Descripción | 1024k Flexible NV SRAM SIMM | |
| Fabricantes | Dallas Semiconductor | |
| Logotipo |  |
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DS3803
1024k Flexible NV SRAM SIMM
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 VCC ± 10% operating range
Employs popular JEDEC standard 72-position
SIMM connector
Extremely thin design built using TSOP-
package IC components
PIN ASSIGNMENT
DS3803 72-Pin SIMM
PIN DESCRIPTION
A0 - A14 - Address Inputs
D0A - D7A - Data Inputs/Outputs, Byte A
D0B - D7B - Data Inputs/Outputs, Byte B
D0C - D7C - Data Inputs/Outputs, Byte C
D0D - D7D - Data Inputs/Outputs, Byte D
CEA - CED - Chip Enable Inputs
WEA - WED - Write Enable Inputs
OEA - OED - Output Enable Inputs
VCC
- +5V Power Supply
GND
- Ground
NC - No Connect
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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ABSOLUTE MAXIMUM RATINGS*
Voltage on Any Pin Relative to Ground
Operating Temperature
Storage Temperature
-0.3V to +7.0V
0ºC to 70ºC
-40ºC to +85ºC
DS3803
* This is a stress rating only and functional operation of the device at these or any other conditions above
those indicated in the operation sections of this specification is not implied. Exposure to absolute
maximum rating conditions for extended periods of time may affect reliability.
RECOMMENDED DC OPERATING CONDITIONS
PARAMETER
SYMBOL MIN
TYP
Power Supply Voltage
VCC 4.5 5.0
Logic 1 input Voltage
VIH 2.2
Logic 0 input Voltage
VIL -0.3
(TA = 0ºC to 70ºC)
MAX UNITS NOTES
5.5 V
VCC+0.3
V
+0.8 V
DC ELECTRICAL CHARACTERISTICS
(TA = 0ºC to 70ºC; VCC = 5V ±10%)
PARAMETER
SYMBOL
TEST
MIN TYP MAX UNITS
CONDITION
Input Leakage Current
IIL
0V ≤ VIN ≤ VCC
-4
+4 µA
Output Leakage Current
ILO 0V ≤ VIN ≤ VCC, -1
all CE = VIH
+1 µA
Operating Current
ICCO min cycle,
duty=100% all
CE = VIL, II/O = 0,
VIN = VIH or VIL
300 mA
Standby Current
ICCS all CE = VIH
20 mA
Output High Current
IOH
VOH = 2.4V
-1.0
mA
Output Low Current
IOL
VOL = 0.4V
2.1
mA
CAPACITANCE
PARAMETER
Input Capacitance
Output Capacitance
SYMBOL
CIN
CI/O
MIN
(TA = 25ºC)
TYP MAX UNITS NOTES
8 pF
10 pF
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| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet DS3803.PDF ] | |
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