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 Automatic VCC power-fail detection for 3.0V or 3.3V power supplies 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