DS1212N

Controllers Overview

The DS1212N is a nonvolatile controller chip designed to convert CMOS RAMs into nonvolatile memories. It operates with a supply voltage range of 4.75V to 5.5V and consumes 5mA of operating current. The device features a 4-to-16 decoder for controlling up to 16 CMOS RAMs, automatic battery switching upon power failure, and write protection when VCC is out of tolerance. It supports redundant batteries and tests battery condition on power-up. The component is housed in a 28-pin DIP package and functions within an operating temperature range of 0°C to 70°C.

Controllers Feature Summary

• Converts full CMOS RAM into nonvolatile memory
• Unconditionally write protects when VCC is out of tolerance
• Automatically switches to battery when power-fail occurs
• Provides for redundant batteries

Controllers Applications

• Battery backup systems for CMOS RAM banks
• Data retention applications requiring write protection
• Systems utilizing redundant battery configurations

Controllers Procurement Notes

Verify the specific suffix 'N' corresponds to the 28-pin DIP package and commercial temperature range (0°C to 70°C) as documented in official specifications. Confirm that the part number matches the manufacturer's current or legacy catalog listings, as availability may vary due to product lifecycle status. Ensure compatibility with existing circuit designs regarding pin assignments and voltage requirements before procurement.

Controllers Selection Notes

Select this component when designing systems that require seamless transition between main power and battery backup for up to 16 CMOS RAM chips. Consider the 28-pin DIP package constraint and the 0°C to 70°C operating temperature range. Evaluate the need for redundant battery support and the specific power-fail detection thresholds required by the application logic.

Controllers Part Context

The DS1212 belongs to the Dallas Semiconductor/Maxim Integrated family of nonvolatile controllers. It is specifically engineered to manage power transitions and decode addresses for multiple RAM devices. The 'N' suffix typically denotes the through-hole DIP packaging variant, distinguishing it from surface-mount options like PLCC. This series addresses data integrity challenges in embedded systems during power interruptions.

Controllers Replacement Considerations

Public confirmed substitute part numbers: None identified.