DS1218+

Controllers Overview

The DS1218+ is a nonvolatile memory controller designed to convert standard CMOS RAM into nonvolatile storage. It operates with a supply voltage range of 4.5V to 5.5V and supports battery backup voltages between 2.5V and 3.5V. The device features an active current consumption of up to 5mA and a battery standby current below 100nA. It provides a chip enable propagation delay of 10ns maximum and utilizes an 8-pin PDIP package for through-hole mounting.

Controllers Feature Summary

• Converts CMOS RAM into nonvolatile memory by monitoring power conditions
• Automatically switches to battery backup during power failure events
• Unconditionally write protects data when supply voltage is out of tolerance

Controllers Applications

• Battery-backed SRAM systems
• Nonvolatile memory controllers
• Power-fail detection circuits

Controllers Procurement Notes

Verify the component status as discontinued or limited supply before procurement planning. Confirm RoHS compliance via the plus suffix. Ensure compatibility with existing PCB footprints for the 8-pin PDIP package. Check lead times and availability constraints due to potential end-of-life status.

Controllers Selection Notes

Select this controller when integrating external CMOS RAM requires automatic nonvolatile conversion. It is suitable for applications needing low battery drain and precise voltage trip points. Consider the 8-pin PDIP package for through-hole designs requiring minimal board space.

Controllers Part Context

The DS1218 belongs to the Maxim Integrated nonvolatile controller family. It addresses the need for reliable data retention in volatile memory systems without complex external circuitry. The device simplifies design by integrating power monitoring, switching, and protection logic into a single compact package.

Controllers Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify cross-reference options through official manufacturer channels if replacement is required.