Product details


Vin (Max) (V) 5.5 Operating temperature range (C) -40 to 85, 0 to 70 Rating Catalog open-in-new Find other Battery monitors & balancers

Package | Pins | Size

PDIP (N) 16 181 mm² 19.3 x 9.4 SOIC (D) 16 59 mm² 9.9 x 6 open-in-new Find other Battery monitors & balancers


  • 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
open-in-new Find other Battery monitors & balancers


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.

open-in-new Find other Battery monitors & balancers

Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 1
Type Title Date
* Datasheet X4 SRAM Nonvolatile Controller Unit datasheet Sep. 05, 1999

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

CAD/CAE symbols

Package Pins Download
PDIP (N) 16 View options
SOIC (D) 16 View options

Ordering & quality

Support & training

TI E2E™ forums with technical support from TI engineers

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​


Related videos