DS3050W

Features:

 Single-Piece, Reflowable, 27mm x 27mm BGAPackage Footprint
  Internal Manganese Lithium Battery and Charger
  Integrated Real-Time Clock
  Unconditionally Write-Protects the Clock andSRAM when VCC is Out-of-Tolerance
  Automatically Switches to Battery Supply whenV_CC Power Failures Occur
  Reset Output can be Used as a CPU Supervisor
  Interrupt Output can be Used as a CPU WatchdogTimer
  Industrial Temperature Range (-40 to + 85)
  UL Recognized


Application

RAID Systems and Servers         Gaming
POS Terminals                            Fire Alarms
Industrial Controllers                 PLCs
Data-Acquisition Systems          Routers/Switches


Specifications

Voltage Range on Any Pin Relative to Ground....-0.3V to +4.6V
Operating Temperature Range ...........................-40to +85
Storage Temperature Range .............................-40 to +85
Soldering Temperature Range.......See IPC/JEDEC J-STD-020C


Description

The DS3050W 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 V_CC is applied to the module, it recharges

the ML battery, powers the clock and SRAM from theexternal power source, and allows the contents of theclockregisters or SRAM to be modified. When V_CC ispowered down or out-of-tolerance, the controller write-protects the memory contents and powers the clockand SRAM from the battery. The DS3050W also con-tains a power-supply monitor output (RST), as well as auser-programmable interrupt output (IRQ/FT).