BQ2204A是TI公司的一款NVSRAM（非易失性SRAM）产品，BQ2204A是用于 4 SRAM 内存组的 SRAM 非易失性控制器 IC，本页介绍了BQ2204A的产品说明、应用、特性等，并给出了与BQ2204A相关的TI元器件型号供参考。
BQ2204A - 用于 4 SRAM 内存组的 SRAM 非易失性控制器 IC - NVSRAM（非易失性SRAM） - 电源管理特殊功能 - TI公司（Texas Instruments，德州仪器）
The CMOS bq2204A SRAM Non-volatile Controller Unit provides all necessary functions for converting up to four 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 four conditioned chip-enable outputs are forced inactive to write-protect up to four banks of SRAM.
During a power failure, the external SRAMs are switched from the VCC supply to one of two 3V backup sup-plies. On a subsequent power-up, the SRAMs are write-protected until a power-valid condition exists.
During power-valid operation, a two-input decoder transparently selects one of up to four banks of SRAM.
- Power monitoring and switching for 3-volt battery-backup applications
- Write-protect control
- 2-input decoder for control of up to 4 banks of SRAM
- 3-volt primary cell inputs
- Less than 10ns chip-enable propagation delay
- 5% or 10% supply operation
