DS2070W Datasheet, PDF (1/12 Pages) Maxim Integrated Products – 3.3V Single-Piece 16Mb Nonvolatile SRAM

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 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 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, (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
Pin Configuration appears at end of data sheet.
Ordering Information
PART
DS2070W-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)
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.