an ESD detection unit comprising a first switch configured to provide a first voltage or a second voltage according to a programming voltage or an ESD pulse on a pad terminal;

a control logic unit comprising a plurality of second switches configured to transmit the first voltage or the second voltage;

a switch unit comprising a third switch configured to be turned on by the first voltage from the control logic unit, a first resistor connected between the pad terminal and the third switch, a fourth switch connected to the third switch and turned on by the second voltage, and a second resistor connected between the third switch and the fourth switch; and

a memory connected to the third switch,

wherein the programming voltage is applied to the memory when the third switch is on, and

the programming voltage is blocked from the memory when the third switch is off.