The DS3045W 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 surface-
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 writeprotects
the memory contents and powers the clock
and SRAM from the battery. The DS3045W also contains
a power-supply monitor output (RST-bar), as well as a
user-programmable interrupt output (IRQ-bar/FT).
Key Features
Applications/Uses
Single-Piece, Reflowable, 27mm x 27mm BGA
Package Footprint
Internal Manganese Lithium Battery and Charger
Integrated Real-Time Clock
Unconditionally Write-Protects the Clock and
SRAM when VCC is Out-of-Tolerance
Automatically Switches to Battery Supply when
VCC Power Failures Occur
Reset Output can be Used as a CPU Supervisor
Interrupt Output can be Used as a CPU Watchdog
Timer
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