DS2045W

Rev 1; 1/05 w 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 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 DS2045W also contains a power-supply monitor output, RST, which can be used as a CPU supervisor for a microprocessor. w w .D at h S a t e e 4U . m o c DS2045W 3.3V Single-Piece 1Mb Nonvolatile SRAM Features ♦ Single-Piece, Reflowable, PBGA 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 ♦ Industrial Temperature Range (-40°C to +85°C) ♦ UL Recognized 27mm2 General Description DS2045W Applications RAID Systems and Servers Industrial Controllers Gaming Router/Switches POS Terminals Data-Acquisition Systems Fire Alarms PLC Pin Configuration appears at end of data sheet. PART DS2045W-100 TEMP RANGE -40°C to +85°C...