DS1312S+

Overview

The DS1312S+ is a nonvolatile RAM controller with an integrated lithium battery monitor, designed to convert standard CMOS SRAM into nonvolatile memory. It operates within a supply voltage range of 4.75V to 5.5V and supports an industrial temperature range from -40°C to +85°C. The device utilizes a 16-pin SOIC package for surface-mount applications. Key electrical characteristics include operating currents of 50µA (CMOS inputs) to 200µA (TTL inputs), a VCC trip point of 4.5V to 4.75V depending on the TOL pin configuration, and a battery trip point of 2.5V to 2.7V.

Feature Summary

• Converts CMOS SRAM into nonvolatile memory by automatically switching to battery backup during power failures
• Monitors lithium cell voltage and provides advanced warning of impending battery failure via an active-low output signal
• Unconditionally write-protects SRAM when the main power supply is out of tolerance

Applications

• Battery backup systems for SRAM modules
• Lithium battery monitoring in nonvolatile memory designs
• Processor reset generation during power failure events

Procurement Notes

Verify that the specific component matches the 16-SOIC package format required for your design. Confirm the presence of the RST pin, as this distinguishes the DS1312S+ variant from other package options. Ensure compatibility with the intended lithium battery voltage specifications before finalizing procurement.

Selection Notes

Select the DS1312S+ when a 16-pin surface-mount solution is required alongside processor reset functionality. Consider the DS1312S-2+ if only an 8-pin footprint is available without reset capabilities. Evaluate the TOL pin requirements to determine the appropriate power-fail detection threshold for the target system.

Part Context

This component belongs to the DS1312 family of nonvolatile controllers manufactured by Analog Devices Inc./Maxim Integrated. The family includes variants such as the 8-pin DIP, 8-pin SOIC, and 20-pin TSSOP packages. The DS1312S+ specifically denotes the 16-pin SOIC version equipped with a reset output feature.

Replacement Considerations

DS1312+