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The DS1323 Flexible NonvolaTIle Controller with Lithium Battery Monitor is a CMOS circuit that solves the applicaTIon problem of converTIng CMOS SRAMs into nonvolaTIle memory. Incoming power is monitored for an out-of-tolerance condition. When such a condition is detected, chip-enable outputs are inhibited to accomplish write protection and the battery is switched on to supply the SRAMs with uninterrupted power. Special circuitry uses a low-leakage CMOS process which affords precise voltage detection at extremely low battery consumption. One DS1323 can support as many as four SRAMs arranged in any of three memory configurations.