The DS1210N is a nonvolatile RAM controller from Analog Devices / Maxim Integrated. It operates within a 4.75V to 5.5V supply range and a temperature range of -40°C to 85°C.
The Analog Devices / Maxim Integrated DS1312 is a nonvolatile controller designed to convert CMOS SRAM into nonvolatile memory. It operates within an industrial temperature range and is available in an 8-pin DIP package.