BQ2204A数据手册集成电路（IC）的控制器规格书PDF

描述 Description

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.

特性 Features

• 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