The F15353 which is a low current consumption 2- wire CMOS real-time clock operates under 1.3V to 3.6V. The current consumption is only 0.55uA and operation voltage is 1.1V as time keeping. Inasystemthatoperatesonabackupbattery,thefreeregisterincorporated in the real-time clock can be used for the user backup memory function. Theuserregistercanholddataonasupplyvoltageaslowas1.1V(min.), sothedatastoredintheregisterbeforethemainpowersupplywasremoved andcan be recalled any time after the power is reconnected.

A clockadjustmentfunctionthat enableswiderangecorrectionofdeviationinthefrequencyofthecrystaloscillatorata minimum resolution of 1 PPMis integrated in the F15353. Theclockadjustmentvaluecanbesetinaccordance withchangesinthetemperature. It is possible to make the realization of clock function thatretains ahighdegreeofaccuracyregardlessoftemperature variation by combining with a temperaturesensor.