DS2045W

The DS2045W 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 DS2045W are encased in a surface-mount module with a 256-ball BGA footprint.Whenever V_CC 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 V_CC is powered down or out of tolerance, the controller write-protects the SRAM's contents and powers the SRAM from the battery. The DS2045W also contains a power-supply monitor output, RST, which can be used as a CPU supervisor for a microprocessor