What this part does — and why you'd search for it
The Maxim DS1314S-2+ is a nonvolatile RAM controller with an integrated battery monitor, designed to preserve SRAM data during a power loss. It sits between the system supply, a backup battery, and the SRAM, automatically switching to battery power when the main rail drops below the threshold. The controller also monitors the battery voltage and asserts a warning flag if the battery is low. This is the part you reach for when a legacy SRAM-backed design needs a clean power-fail handoff without a separate supervisor IC.
3.3V supply — the fit question answered
Supply range is 3V to 3.6V, so it operates on a 3.3V rail. The battery monitor threshold is set internally for a lithium cell.
Temperature grade and environment
Rated for -40°C to 85°C, so it fits industrial environments — factory automation, outdoor telecom cabinets, engine-bay-adjacent control modules, and any unheated enclosure. The 8-SOIC package is easy to hand-solder in a rework station or even with a fine-tip iron if the board is accessible. No hot-air station required for a field swap, which matters when the repair is on site.
Lifecycle and sourcing reality
The DS1314S-2+ is listed as Active and ROHS3 compliant. No end-of-life notice, no last-time-buy pressure. It is a current-production part from Maxim (now part of Analog Devices). For a BOM line that needs a nonvolatile RAM controller with battery monitoring, this is a stable, available choice — no need to qualify a substitute unless you want a second source for supply resilience.