DS1211SN

Overview

The DS1211SN is a nonvolatile memory controller manufactured by Analog Devices Inc./Maxim Integrated, designed to convert full CMOS RAMs into nonvolatile memories. It operates within a supply voltage range of 4.75V to 5.5V and features an industrial temperature range from -40°C to +85°C. The device consumes less than 100 nA of battery current and utilizes a 3-to-8 decoder to control up to eight CMOS RAMs. It is housed in a 20-pin SOIC package with a width of 7.50mm.

Feature Summary

• Unconditionally write protects data when VCC is out of tolerance
• Automatically switches to battery power upon power-fail detection
• Tests battery condition on power-up
• Provides for redundant batteries

Applications

• Converting CMOS RAMs into nonvolatile memories
• Controlling up to eight CMOS memories using lithium batteries
• Power-fail signal interrupting processor on power failure

Procurement Notes

Verify the specific ordering suffix against official documentation to confirm package type and temperature range. Confirm RoHS compliance status as indicated in manufacturer records. Check for obsolescence or lifecycle status before procurement planning. Ensure compatibility with existing system voltage requirements.

Selection Notes

Select this component when converting multiple CMOS RAMs to nonvolatile storage is required. Consider the 20-pin SOIC package for surface mount applications. Verify that the industrial temperature range meets environmental specifications. Evaluate the low battery consumption requirement against system power budgets.

Part Context

The DS1211 belongs to the DS1211S series of nonvolatile controllers. It serves as a companion to various CMOS RAMs to provide data retention during power loss. The SN suffix indicates the specific package and temperature variant within the broader product family.

Replacement Considerations

DS1211SN+