All versions are being discontinued and are subject to Last Time Buy, after which new orders can not be placed. See Ordering Information for recommended replacements.
The DS2050W is a 4Mb 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. The DS2050W also
contains a power-supply monitor output, active-low RST, which can
be used as a CPU supervisor for a microprocessor.
Key Features
Applications/Uses
Single-Piece, Reflowable, 27mm x 27mm BGA 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
Below Nominal VCC (3.3V)
Reset Output can be Used as a CPU Supervisor
for a Microprocessor
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