Nonvolatile RAM controller — battery-backed SRAM retention
The DS1314S-2+T&R: This is a Nonvolatile RAM controller — its job is to manage a battery-backed SRAM array so that data survives a power loss. When the main supply drops below the threshold, the controller switches the SRAM to battery power, holds the chip in write-protect, and maintains the memory contents indefinitely as long as the battery is present. The supply range is 3V to 3.6V, which aligns with a standard 3.3V rail — the same rail that powers the SRAM and the rest of the logic. The controller monitors that rail and triggers the backup sequence when it falls out of tolerance.
The 8-SOIC package is a standard surface-mount footprint — the same pad layout used by countless SOIC-8 SRAMs and logic devices, so the board layout is straightforward.
ROHS3 and compliance posture
ROHS3 compliant, which covers the latest EU exemption updates. No additional compliance documentation (REACH, UL, IEC) is listed in the available record, but the ROHS3 marking is the standard environmental declaration for this class of IC.