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PDF DS2070W Data sheet ( Hoja de datos )
| Número de pieza | DS2070W | |
| Descripción | 3.3V Single Piece 16Mb Nonvolatile SRAM | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Rev 0; 8/06
3.3V Single-Piece 16Mb
Nonvolatile SRAM
General Description
The DS2070W is a 16Mb reflowable nonvolatile (NV)
SRAM, which consists of a static RAM (SRAM), an NV
controller, and an internal rechargeable manganese
lithium (ML) battery. These components are encased in
a surface-mount module with a 256-ball BGA footprint.
Whenever VCC is applied to the module, it recharges the
ML battery, powers the SRAM from the external power
source, and allows the contents of the SRAM to be mod-
ified. When VCC is powered down or out-of-tolerance,
the controller write-protects the SRAM’s contents and
powers the SRAM from the battery. The DS2070W also
contains a power-supply monitor output, RST, which can
be used as a CPU supervisor for a microprocessor.
RAID Systems and Servers
Industrial Controllers
Data-Acquisition Systems
Gaming
Applications
POS Terminals
Routers/Switches
Fire Alarms
PLC
Features
o Single-Piece, Reflowable, 27mm2 PBGA Package
Footprint
o Internal ML Battery and Charger
o Unconditionally Write-Protects SRAM when VCC
is Out-of-Tolerance
o Automatically Switches to Battery Supply when
VCC Power Failures Occur
o Internal Power-Supply Monitor Detects Power Fail
Below Nominal VCC (3.3V)
o Reset Output can be Used as a CPU Supervisor
for a Microprocessor
o Industrial Temperature Range (-40°C to +85°C)
o UL Recognized
Pin Configuration appears at end of data sheet.
Ordering Information
PART
DS2070W-100#
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
256 Ball 27mm2 BGA Module
SPEED (ns)
100
SUPPLY TOLERANCE
3.3V ±0.3V
#Denotes a RoHS-compliant device that may include lead that is exempt under the RoHS requirements.
Typical Operating Circuit
(CE)
(WR)
(RD)
MICROPROCESSOR
OR DSP
DATA
ADDRESS
(INT)
8 BITS
21 BITS
CE
WE
OE
DS2070W
2048k x 8
NV SRAM
DQ0–DQ7
A0–A20
RST
______________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
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ADDRESSES
CE
WE
DOUT
DIN
(SEE NOTES 2, 3, 4, 6, 10–13.)
ADDRESSES
CE
WE
DOUT
DIN
(SEE NOTES 2, 3, 5, 6, 10–13.)
3.3V Single-Piece 16Mb
Nonvolatile SRAM
Write Cycle 1
tWC
VIH VIH VIH
VIL VIL VIL
tAW
VIL VIL
tWP
tWR1
VIH
VIH
VIL VIL
tODW
tOEW
HIGH
IMPEDANCE
tDS tDH1
VIH
DATA IN STABLE
VIL
VIH
VIL
VIH
VIL
tAW
VIH
VIL
tCOE
tWC
tWP
VIL VIL
VIH
VIL
tWR2
VIH
Write Cycle 2
VIH
VIL
VIL VIL
tODW
tDS tDH2
VIH
DATA IN STABLE
VIL
VIH
VIL
_____________________________________________________________________ 5
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3.3V Single-Piece 16Mb
Nonvolatile SRAM
Recommended Reflow Temperature Profile
PROFILE FEATURE
Sn-Pb EUTECTIC
ASSEMBLY
Average ramp-up rate
(TL to TP)
3°C/second max
Preheat
- Temperature min (TSmin)
- Temperature max (TSmax)
- Time (min to max) (tS)
+100°C
+150°C
60 to 120 seconds
TSmax to TL
- Ramp-up rate
Time maintained above:
- Temperature (TL)
- Time (tL)
+183°C
60 to 150 seconds
Peak temperature (TP)
+225 +0/-5°C
Time within 5°C of actual peak
temperature (TP)
Ramp-down rate
10 to 30 seconds
6°C/second max
Time +25°C to peak temperature
6 minutes max
Note: All temperatures refer to top side of the package, mea-
sured on the package body surface.
Recommended Cleaning Procedures
The DS2070W may be cleaned using aqueous-based
cleaning solutions. No special precautions are needed
when cleaning boards containing a DS2070W module.
Removal of the topside label violates the environmen-
tal integrity of the package and voids the warranty of
the product.
Applications Information
Power-Supply Decoupling
To achieve the best results when using the DS2070W,
decouple the power supply with a 0.1µF capacitor. Use
a high-quality, ceramic surface-mount capacitor if pos-
sible. Surface-mount components minimize lead induc-
tance, which improves performance, while ceramic
capacitors have adequately high frequency response
for decoupling applications.
Using the Open-Drain RST Output
The RST output is open drain, and therefore requires a
pullup resistor to realize a high logic output level. Pullup
resistor values between 1kΩ and 10kΩ are typical.
Battery Charging/Lifetime
The DS2070W charges an ML battery to maximum
capacity in approximately 96 hours of operation when
VCC is greater than VTP. Once the battery is charged,
its lifetime depends primarily on the VCC duty cycle.
The DS2070W can maintain data from a single, initial
charge for up to 3 years. Once recharged, this deep-
discharge cycle can be repeated up to 20 times, pro-
ducing a worst-case service life of 60 years. More
typical duty cycles are of shorter duration, enabling the
DS2070W to be charged hundreds of times, therefore
extending the service life well beyond 60 years.
____________________________________________________________________ 11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet DS2070W.PDF ] | |
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