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PDF DS2045W Data sheet ( Hoja de datos )
| Número de pieza | DS2045W | |
| Descripción | Single-Piece 1M Nonvolatile SRAM | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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Rev 1; 1/05
heet4U.coDmS2045W 3.3VNSoinngvloel-aPtiieleceSR1AMMbGeneral Description
SThe DS2045W is a 1Mb reflowable nonvolatile (NV)
taSRAM, which consists of a static RAM (SRAM), an NV
acontroller, and an internal rechargeable manganese
.Dlithium (ML) battery. These components are encased in
a surface-mount module with a 256-ball BGA footprint.
wWhenever VCC is applied to the module, it recharges the
wML battery, powers the SRAM from the external power
wsource, and allows the contents of the SRAM to be mod-
ified. When VCC is powered down or out of tolerance,
mthe controller write-protects the SRAM’s contents and
powers the SRAM from the battery. The DS2045W also
ocontains a power-supply monitor output, RST, which can
.cbe used as a CPU supervisor for a microprocessor.
URAID Systems and Servers
t4Industrial Controllers
Gaming
Router/Switches
Applications
POS Terminals
Data-Acquisition Systems
Fire Alarms
PLC
Features
♦ Single-Piece, Reflowable, 27mm2 PBGA Package
Footprint
♦ Internal ML Battery and Charger
♦ Unconditionally Write-Protects SRAM when VCC
is Out-of-Tolerance
♦ Automatically Switches to Battery Supply when
VCC Power Failures Occur
♦ Internal Power-Supply Monitor Detects Power Fail
Below Nominal VCC (3.3V)
♦ Reset Output can be used as a CPU Supervisor
for a Microprocessor
♦ Industrial Temperature Range (-40°C to +85°C)
♦ UL Recognized
Pin Configuration appears at end of data sheet.
heePART
SDS2045W-100
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
256 Ball 27mm2 BGA Module
Ordering Information
SPEED (ns)
100
SUPPLY TOLERANCE (%)
3.3V ±0.3V
ta Typical Operating Circuit
.Da(CE0)
P4.0
(WR)
P3.6
w (RD)
P3.7
w8051 AD0–AD7
w omMICROPROCESSOR
.cP1.0–7
t4UP4.4
eeP2.0–7
h(INT0)
SP3.2
8 BITS
8 BITS
8 BITS
CE
WE
OE
DS2045W
DQ0–7 128k x 8
NV SRAM
A0–7
A16
A8–15
RST
.Data______________________________________________ Maxim Integrated Products 1
wwFor pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
w1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
1 page  
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.)
DS2045W 3.3V Single-Piece 1Mb
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
VIL VIL
tODW
VIH
VIL
tWR2
VIH
VIH
Write Cycle 2
VIH
VIL
tDS tDH2
VIH
DATA IN STABLE
VIL
VIH
VIL
_____________________________________________________________________ 5
5 Page 
DS2045W 3.3V Single-Piece 1Mb
Nonvolatile SRAM
Recommended Reflow Temperature Profile
PROFILE FEATURE
Average ramp-up rate
(TL to TP)
Preheat
- Temperature min (TSmin)
- Temperature max (TSmax)
- Time (min to max) (ts)
Sn-Pb EUTECTIC
ASSEMBLY
3°C/second max
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 DS2045W may be cleaned using aqueous-based
cleaning solutions. No special precautions are needed
when cleaning boards containing a DS2045W 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 DS2045W,
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 DS2045W 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 DS2045W 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
DS2045W 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 DS2045W.PDF ] | |
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