BQ2204A SRAM Nonvolatile Controller IC for 4 SRAM Banks | TI.com

BQ2204A (ACTIVE) SRAM Nonvolatile Controller IC for 4 SRAM Banks

SRAM Nonvolatile Controller IC for 4 SRAM Banks - BQ2204A
Datasheet
 

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.

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

Parametrics

Compare all products in Battery protectors Email Download to Excel
Part number Order Features Rating Package Group Approx. price (US$)
BQ2204A Order now Controller     Catalog     PDIP | 16
SOIC | 16    
3.40 | 1ku