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A 512-bit EEPROM IP was designed by using just logic process based devices.To limit the voltages of the devices within5.5 V,EEPROM core circuits,control gate(CG)and tunnel gate(TG)driving circuits,DC-DC converters: positive pumping voltage(VPP=4.75 V),negative pumping voltage(VNN=-4.75 V),and VNNL(= VNN/2)generation circuit were proposed.In addition,switching powers CG high voltage(CG_HV),CG low voltage(CG_LV),TG high voltage(TG_HV),TG low voltage(TG_LV),VNNL_CG and VNNL_TG switching circuit were supplied for the CG and TG driving circuit.Furthermore,a sequential pumping scheme and a new ring oscillator with a dual oscillation period were proposed.To reduce a power consumption of EEPROM in the write mode,the reference voltages VREF_VPP for VPP and VREE_VNN for VNN were used by dividing VDD(1.2 V)supply voltage supplied from the analog block in stead of removing the reference voltage generators.A voltage level detector using a capacitive divider as a low-power DC-DC converter design technique was proposed.The result shows that the power dissipation is 0.34 μW in the read mode,13.76 μW in the program mode,and 13.66 μW in the erase mode.