DS1312

Controllers Overview

The DS1312 is a nonvolatile memory controller designed to convert CMOS SRAM into nonvolatile memory. It monitors the VCCI supply and automatically switches to a lithium battery backup when power fails, while simultaneously inhibiting writes to protect data integrity. The device features an open-drain Battery Warning output that signals low battery conditions based on periodic loaded-voltage testing. Industrial-grade versions support 8-pin DIP/SOIC packages, with 16-pin SOIC and 20-pin TSSOP variants adding a processor reset function. Operating voltage ranges from 4.75V to 5.5V.

Controllers Feature Summary

• Converts standard CMOS SRAM into nonvolatile memory by managing power switching between system supply and backup battery
• Monitors battery health using periodic loaded-voltage measurements to provide advanced warning of impending cell failure
• Unconditionally write-protects attached SRAM during power outages to ensure data preservation
• Includes optional processor reset functionality in specific package variants to manage system initialization

Controllers Applications

• Battery-backed SRAM modules for industrial control systems
• Data logging applications requiring long-term retention without continuous main power
• Embedded systems needing automated battery replacement warnings
• Processor-based architectures requiring hardware-level power-fail protection

Controllers Procurement Notes

Verify the specific package suffix (DIP, SOIC, or TSSOP) matches the target PCB footprint. Confirm whether the reset pin functionality is required, as it is only present in the 16-pin and 20-pin versions. Ensure the tolerance selection pin configuration aligns with the desired power-fail detection threshold before ordering.

Controllers Selection Notes

Select the 8-pin variant for space-constrained designs where processor reset is unnecessary. Choose the 16-pin or 20-pin versions if system reset generation upon power failure is required. Verify the operating temperature range meets the application environment, as the standard industrial range covers -40°C to +85°C.

Controllers Part Context

The DS1312 belongs to Maxim Integrated's family of nonvolatile memory controllers. It addresses the common engineering challenge of maintaining data integrity in volatile RAM during unexpected power loss. By integrating battery monitoring and write-protection logic, it simplifies the design of reliable storage subsystems in embedded electronics.

Controllers Replacement Considerations

DS1312+