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Precision Comparator For Power Monitoring and Switching Controller For SRAM
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The CMOS bq2205 SRAM non-volatile controller with reset provides all the necessary functions for converting one or two banks of standard CMOS SRAM into non-volatile read/write memory.
A precision comparator monitors the 3.3-V VCC input for an out-of-tolerance condition. 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, VOUT, is switched from the VCC supply to the battery-backup supply as VCC decays. On a subsequent power-up, the VOUT supply is automatically switched from the backup supply to the VCC supply. The external SRAMs are write-protected 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, A, selects one of two banks of SRAM.
The CMOS bq2205 SRAM non-volatile controller with reset provides all the necessary functions for converting one or two banks of standard CMOS SRAM into non-volatile read/write memory.
A precision comparator monitors the 3.3-V VCC input for an out-of-tolerance condition. 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, VOUT, is switched from the VCC supply to the battery-backup supply as VCC decays. On a subsequent power-up, the VOUT supply is automatically switched from the backup supply to the VCC supply. The external SRAMs are write-protected 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, A, selects one of two banks of SRAM.
Mounting Style SMD/SMT
Memory Type Nonvolatile SRAM
Supply Voltage - Min 3 V
Minimum Operating Temperature - 20 C
Series BQ2205LY
Type Non-Volatile SRAM (NVSRAM)
Description/Function Provides all the necessary functions for converting one or two banks
Package / Case TSSOP-16
Battery Backup Switching Yes
Packaging Tube
Lithium Battery Monitor Yes
Maximum Operating Temperature + 70 C
Supply Voltage - Max 3.6 V
Operating Current 210 uA
Factory Pack Quantity 90
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