DS1211SN+

Controllers Overview

The DS1211SN+ is a nonvolatile memory controller designed to convert full CMOS RAMs into nonvolatile memories. It operates within a supply voltage range of 4.75V to 5.25V and consumes less than 100 nA of battery current. The device supports an industrial temperature range from -40°C to +85°C and is housed in a 20-SOIC surface-mount package.

Controllers Feature Summary

• Converts full CMOS RAMs into nonvolatile memories by monitoring incoming power for out-of-tolerance conditions
• Unconditionally write protects data when VCC is out of tolerance and automatically switches to battery upon power-fail
• Includes a 3-to-8 decoder providing control for up to eight CMOS RAMs with redundant battery support

Controllers Applications

• Systems requiring nonvolatile operation for multiple CMOS memories
• Applications needing automatic battery switching during power failures
• Circuits requiring unconditional write protection when supply voltage is out of tolerance

Controllers Procurement Notes

Verify the component status as obsolete or limited availability through official manufacturer channels. Confirm that the SN suffix corresponds to the SOIC package and industrial temperature range (-40°C to +85°C). Ensure compatibility with existing lithium battery configurations for the dual VBAT inputs before procurement.

Controllers Selection Notes

Select this controller when converting up to eight CMOS RAMs into nonvolatile storage is required. Choose the SN variant specifically for surface-mount assembly needs and industrial temperature requirements. Verify that the system design accommodates the specific 20-pin SOIC footprint and the necessary external lithium batteries for the VBAT1 and VBAT2 pins.

Controllers Part Context

The DS1211 series serves as a nonvolatile controller x 8 chip, solving application problems related to CMOS RAM retention. It works in conjunction with lithium batteries to provide uninterrupted power. The datasheet references the DS1212 Nonvolatile Controller x 16 Chip for additional electrical specifications and operational details.

Controllers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.