DS2070W

` Single-Piece, Reflowable, (27mm)<sup>2</sup> PBGA Package Footprint
` Internal ML Battery and Charger
` Unconditionally Write-Protects SRAM when V<sub>CC</sub> is Out-of-Tolerance
` Automatically Switches to Battery Supply when V_CC Power Failures Occur
` Internal Power-Supply Monitor Detects Power Fail Below Nominal V<sub>CC</sub> (3.3V)
` Reset Output can be Used as a CPU Supervisor for a Microprocessor
` Industrial Temperature Range (-40 to +85)
` UL Recognized

Voltage on Any Pin Relative to Ground ...............-0.3V to +4.6V
Operating Temperature Range ...........................-40 to +85
Storage Temperature Range ..............................-40 to +85
Soldering Temperature .....................See IPC/JEDEC J-STD-020
Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

The DS2070W is a 16Mb 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 V_CC is applied to the module, DS2070W recharges the ML battery, powers the SRAM from the external power source, and allows the contents of the SRAM to be modified.

When V_CC is powered down or out-of-tolerance, the DS2070W controller write-protects the SRAM's contents and powers the SRAM from the battery. The DS2070W also contains a power-supply monitor output, RST, which can be used as a CPU supervisor for a microprocessor.