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 V
CC
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 V
CC
is powered down or out-of-tolerance,
the controller write-protects the SRAM’s contents and
powers the SRAM from the battery. The DS2050W also
contains a power-supply monitor output,
RST,
which can
be used as a CPU supervisor for a microprocessor.
Features
o
Single-Piece, Reflowable, 27mm
2
PBGA Package
Footprint
o
Internal ML Battery and Charger
o
Unconditionally Write-Protects SRAM when V
CC
is Out-of-Tolerance
o
Automatically Switches to Battery Supply when
V
CC
Power Failures Occur
o
Internal Power-Supply Monitor Detects Power Fail
Below Nominal V
CC
(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
DS2050W
Applications
RAID Systems and Servers
Industrial Controllers
Data-Acquisition Systems
Gaming
POS Terminals
Routers/Switches
Fire Alarms
PLC
Pin Configuration appears at end of data sheet.
Ordering Information
PART
DS2050W-100#
TEMP RANGE
-40°C to +85°C
PIN-PACKAGE
256 Ball 27mm
2
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)
CE
WE
OE
DS2050W
MICROPROCESSOR
OR DSP
DATA
512k x 8
NV SRAM
8 BITS
DQ0–7
ADDRESS
19 BITS
A0–18
(INT)
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.
DS2050W 3.3V Single-Piece 4Mb
Nonvolatile SRAM
DS2050W
ABSOLUTE MAXIMUM RATINGS
Voltage on Any Pin Relative to Ground .................-0.3V to +4.6V
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range ...............................-40°C to +85°C
Soldering Temperature .....................See IPC/JEDEC J-STD-020
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
