Maxim Integrated DS1312S-2+, SRAM Controller Unit, 6V, 10ns, 8-Pin SO

Converts CMOS SRAM into nonvolatile memory
Unconditionally write-protects SRAM when VCC is out of tolerance
Automatically switches to battery backup supply when VCC power failure occurs
Monitors voltage of a lithium cell and provides advanced warning of impending battery failure
Signals low-battery condition on active low Battery Warning output signal
Optional 5% or 10% power-fail detection
Space-saving 8-pin DIP and SOIC packages
Optional 16-pin SOIC and 20-pin TSSOP versions reset processor when power failure occurs and hold processor in reset during system power-up
Industrial temperature range of -40°C to +85°C