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VPFD is a threshold range. The behavior will change when the battery voltage is above and below this as well as VCC. For the battery range see Backup cell voltage, VBC in Recommended Operating Conditions, 2.4 to 4V
If SRAM is not used CEOUT does not need to be connected. CEOUTis an output, the IC will drive it according to the input conditions, but it can be ignored.
