The DS1321S from Analog Devices / Maxim Integrated is a Nonvolatile RAM Controller designed to convert CMOS SRAM into nonvolatile memory. It operates at 4.75V to 5.5V and is suitable for industrial temperature ranges.
The DS1210SN is a nonvolatile RAM controller chip from Analog Devices / Maxim Integrated. It operates within a voltage range of 4.75V to 5.5V and has an industrial temperature range.
The Analog Devices / Maxim Integrated DS1312S is a nonvolatile RAM controller designed to convert CMOS SRAM into nonvolatile memory. It operates within an industrial temperature range and comes in a 16-SOIC package.