DS1312S/T&R

Controllers Overview

The DS1312S/T&R is a nonvolatile memory controller with an integrated lithium battery monitor, designed to convert CMOS SRAM into nonvolatile memory. It operates within a supply voltage range of 4.5V to 5.5V and supports an industrial temperature range from -40°C to +85°C. The device features automatic switching between main power and battery backup, precise voltage detection for write protection, and periodic battery monitoring to signal impending failure via an open-drain warning output.

Controllers Feature Summary

• Converts standard CMOS SRAM into nonvolatile memory by managing power transitions between the system supply and a backup lithium cell.
• Unconditionally inhibits chip enable outputs to protect data when the main power supply falls out of tolerance.
• Monitors battery capacity by periodically applying an internal resistive load and comparing loaded voltage against a reference threshold.
• Provides active-low signals for both low-battery warnings and processor reset functions during power failures.

Controllers Applications

• Battery backup systems for static random-access memory (SRAM) modules
• Processor-based systems requiring power-fail detection and reset generation
• Industrial equipment needing reliable nonvolatile storage in extreme temperatures

Controllers Procurement Notes

Verify that the specific ordering suffix matches the required package type, as the base part number covers multiple form factors. Confirm RoHS compliance status based on the presence of the plus sign in the part designation. Ensure the design accommodates the open-drain nature of the Battery Warning and Reset outputs by including appropriate pull-up resistors.

Controllers Selection Notes

Select this component when converting external CMOS SRAM to nonvolatile storage is required rather than using integrated NVSRAM. Consider the 16-pin SOIC package for space-constrained designs compared to the 8-pin variants. Evaluate the need for processor reset functionality, which is available on the S and E versions but not the basic DIP or 8-SOIC types.

Controllers Part Context

This component belongs to the DS1312 family of nonvolatile controllers manufactured by Analog Devices Inc./Maxim Integrated. The family includes variations such as the DS1312+ (8-PDIP), DS1312S-2+ (8-SOIC), and DS1312E+ (20-TSSOP). All variants share the same core functionality for SRAM backup and battery monitoring.

Controllers Replacement Considerations

DS1312S+