A device includes an interface circuit connected between a pad and an internal circuit. The interface circuit comprises a pull-up driver including first and second PMOS transistors and a first impedance controller. The first PMOS transistor is connected between a power terminal provided to a power voltage and a first connection node and controlled by a first control bias. The second PMOS transistor connected between the first connection node and the pad and normally turned-on, and the first impedance controller is connected to the first connection node to control an impedance thereof based on the first control bias. The interface circuit further includes a pull-down driver including first and second NMOS transistors. The first NMOS transistor is connected between the pad and a second connection node and controlled by a driving voltage, and the second NMOS transistor is connected between the second connection node and a ground voltage terminal.