DS1314S

Controllers Overview

The DS1314 is a CMOS nonvolatile controller with an integrated lithium battery monitor designed to convert standard CMOS SRAM into nonvolatile memory. It continuously monitors the VCCI supply for out-of-tolerance conditions, automatically inhibiting chip enable to write-protect the SRAM and switching power from the system supply to a backup battery when VCCI drops below the switch point. The device features automatic power-fail detection at nominal 3.0V or 3.3V supplies, configurable via the TOL pin. It includes a Battery Warning output that signals low-battery conditions based on periodic loaded-voltage testing.

Controllers Feature Summary

• Converts CMOS SRAM into nonvolatile memory by managing power switching between system supply and backup battery
• Unconditionally write-protects SRAM during power failures by inhibiting the chip enable output
• Monitors lithium cell voltage using periodic internal resistive loading to provide advanced warning of impending battery failure
• Detects power failures and signals processor-based systems via an open-drain reset output

Controllers Applications

• Battery backup support for SRAM modules
• Nonvolatile memory conversion in embedded systems
• Lithium battery monitoring and replacement warning circuits
• Processor reset generation during power-up and power-down events

Controllers Procurement Notes

Verify the specific package variant required, as the DS1314 family includes 8-pin SOIC (DS1314S-2), 16-pin SOIC (DS1314S), and 20-pin TSSOP (DS1314E) options. Confirm the TOL pin configuration matches the target supply voltage (3.0V vs 3.3V). Ensure external pull-up resistors are included for the open-drain BW and RST outputs. Check RoHS compliance status if lead-free packaging is mandated for the assembly process.

Controllers Selection Notes

Select the appropriate package based on board space constraints; the 8-pin SOIC is space-saving while the 16-pin and 20-pin versions include a dedicated Reset output. Choose the TOL pin connection strategy to align with the system's nominal VCCI level. Consider the Freshness Seal Mode if battery preservation during storage is critical. Verify that the operating temperature range meets the application requirements of -40°C to +85°C.

Controllers Part Context

The DS1314 belongs to the Maxim Integrated (now Analog Devices) line of nonvolatile controllers. It is part of a broader family that includes variants like the DS1312 and DS1315. The component addresses the common engineering challenge of maintaining data integrity in volatile RAM during power interruptions without requiring complex external circuitry. It integrates both power management and battery health monitoring functions into a single CMOS IC.

Controllers Replacement Considerations

Direct substitutes within the same family include the DS1314S+ (16-pin SOIC) and DS1314E+ (20-pin TSSOP), which offer additional Reset functionality compared to the base 8-pin version. Cross-family replacements may require verification of pin compatibility and electrical characteristics.