General Description
   The DS2045 is a 1Mb 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 modified. When VCC is powered down or out of tolerance, the controller write-protects the SRAM’s contents and powers the SRAM from the battery. 

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
   at 5% or 10% Below Nominal VCC (5V)
♦ Reset Output can be used as a CPU Supervisor
   for a Microprocessor
♦ Industrial Temperature Range (-40°C to +85°C)
♦ UL Recognized

APPLICATIONs
   RAID Systems and Servers 
   POS Terminals
   Industrial Controllers 
   Data-Acquisition Systems
   Gaming 
   Fire Alarms
   Router/Switches 
   PLC