DS1218S+

Controllers Overview

The DS1218S+ is a nonvolatile memory controller designed to convert standard CMOS RAM into nonvolatile storage. It operates within a supply voltage range of 4.5 V to 5.5 V and supports battery backup voltages between 2.5 V and 3.5 V. The device draws up to 5 mA during active operation and consumes less than 100 nA in battery standby mode. It features a chip enable propagation delay of 10 ns maximum and functions reliably across an operating temperature range of 0°C to +70°C.

Controllers Feature Summary

• Converts CMOS RAM into nonvolatile memory by managing power sources
• Unconditionally write protects data when supply voltage is out of tolerance
• Automatically switches to battery backup upon power failure detection

Controllers Applications

• Battery-backed RAM systems requiring data retention
• Embedded applications needing low-power nonvolatile storage
• Systems requiring automatic power-fail protection for memory integrity

Controllers Procurement Notes

Verify the component status as obsolete or end-of-life through official manufacturer channels before procurement planning. Confirm that the SOIC-8 package variant matches your PCB footprint requirements. Ensure compatibility with the specified 4.5 V to 5.5 V supply range and 2.5 V to 3.5 V battery input. Check for lead-free compliance if required by your assembly standards.

Controllers Selection Notes

Select this controller when integrating external CMOS SRAM with lithium batteries for nonvolatile storage solutions. It is suitable for designs prioritizing minimal board space due to its compact 8-pin package. Consider the low battery current consumption for long-term reliability in battery-powered applications. Ensure the system voltage remains within the recommended operating limits to maintain precise voltage detection.

Controllers Part Context

The DS1218 series belongs to Analog Devices' (formerly Maxim Integrated) line of nonvolatile controllers. These devices are engineered to simplify the implementation of battery-backed RAM in embedded systems. The S+ suffix indicates a lead-free, RoHS-compliant packaging option. This specific model utilizes an 8-pin Small Outline package for surface-mount assembly.

Controllers Replacement Considerations

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