DS1218S/T&R

Controllers Overview

The DS1218S/T&R is a nonvolatile RAM controller IC in an 8-SOIC package. It converts CMOS RAM into nonvolatile memory by monitoring the VCCI supply for out-of-tolerance conditions. When power fails, it automatically switches to a battery connected to the VBAT pin and unconditionally write-protects the RAM. The device operates within a 4.5V to 5.5V supply range and consumes less than 100nA of battery current. It features a propagation delay of 10ns and functions within a 0°C to +70°C temperature range.

Controllers Feature Summary

• Converts standard CMOS RAM into nonvolatile memory through integrated power management
• Automatically switches to battery backup upon detection of power failure
• Unconditionally write protects data when supply voltage is out of tolerance

Controllers Applications

• Battery-backed nonvolatile memory systems
• Data retention applications requiring uninterrupted power during power loss
• Embedded systems needing compact nonvolatile storage solutions

Controllers Procurement Notes

Verify the specific suffix T&R indicates tape-and-reel packaging configuration against official manufacturer documentation. Confirm RoHS compliance status as indicated by the plus sign in related part numbers. Ensure compatibility with target CMOS RAM devices regarding voltage levels and interface requirements before procurement.

Controllers Selection Notes

Select this component when designing systems that require converting volatile CMOS SRAM into nonvolatile storage without complex external circuitry. Consider the 8-pin SOIC package for space-constrained PCB layouts. Evaluate the low battery leakage current requirement against expected standby durations to ensure adequate battery life for the application.

Controllers Part Context

The DS1218 series belongs to Maxim Integrated's family of nonvolatile controllers designed to simplify the integration of battery-backed RAM. These devices eliminate the need for discrete power-fail detection and switching components. The DS1218S variant specifically utilizes an 8-pin Small Outline package, offering a compact footprint suitable for dense electronic assemblies.

Controllers Replacement Considerations

Check for DS1218S+ or other variants within the DS1218 family for potential replacements. Verify pinout compatibility and electrical specifications such as supply voltage ranges and battery backup thresholds. Ensure any substitute maintains the same write-protection and automatic switching functionality.