Integrated Backup Unit

The CMOS BQ2502 Integrated Backup Unit provides all the necessary func- tions for converting one or two banks of standard CMOS SRAM into nonvolatile read/write memory. A precision Comparator monitors the 5V VCC input for an out-of-tolerance condi- tion. When out of tolerance is detected, the two conditioned chip-enable outputs are forced inactive to write-protect both banks of SRAM Power for the external SRAMs is switched from the VCC supply to the internal battery-backup supply as VCC decays. On a subsequent power-up, the VOUT supply is auto- matically switched from the internal lithium supply to the VCC supply. The external SRAMs are write-pro- tected until a power-valid condition exists. The reset output provides power-fail and power-on resets for the system. During power-valid operation, the input decoder selects one of two banks of SRAM The internal lithium cell is initially electrically isolated, protecting the battery from accidental discharge. Connection to the battery is made only after the first application of VCC. By Texas Instruments
BQ2502 's PackagesBQ2502 's pdf datasheet

BQ2502 Pinout, Pinouts
BQ2502 pinout,Pin out
This is one package pinout of BQ2502,If you need more pinouts please download BQ2502's pdf datasheet.

BQ2502 Application circuits
BQ2502 circuits
This is one application circuit of BQ2502,If you need more circuits,please download BQ2502's pdf datasheet.

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