Rev 1; 10/06
3.3V Single-Piece 16Mb Nonvolatile SRAM
The DS3070W consists of a static RAM, a nonvolatile
(NV) controller, a year 2000-compliant real-time clock
(RTC), and an internal rechargeable manganese lithium
(ML) battery. These components are encased in a sur-
face-mount module with a 256-ball BGA footprint.
Whenever VCC is applied to the module, it recharges
the ML battery, powers the clock and SRAM from the
external power source, and allows the contents of the
clock registers or SRAM to be modified. When VCC is
powered down or out-of-tolerance, the controller write-
protects the memory contents and powers the clock
and SRAM from the battery. The DS3070W also con-
tains a power-supply monitor output (RST), as well as a
user-programmable interrupt output (IRQ/FT).
RAID Systems and Servers
o Single-Piece, Reflowable, 27mm x 27mm BGA
o Internal Manganese Lithium Battery and Charger
o Integrated Real-Time Clock
o Unconditionally Write-Protects the Clock and
SRAM when VCC is Out-of-Tolerance
o Automatically Switches to Battery Supply when
VCC Power Failures Occur
o Reset Output can be Used as a CPU Supervisor
o Interrupt Output can be Used as a CPU Watchdog
o Industrial Temperature Range (-40°C to +85°C)
o UL Recognized
-40°C to +85°C
256-ball 27mm x 27mm BGA Module
#Denotes a RoHS-compliant device that may include lead that is exempt under the RoHS requirements.
Typical Operating Circuit
OR DSP DATA
2048k x 8
DQ0–7 NV SRAM
Pin Configuration appears at end of data sheet.
______________________________________________ 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.