ESD PROTECTION CIRCUITRY, AND ELECTRONIC DEVICE INCLUDING ESD PROTECTION CIRCUITRY

An electrostatic discharge protection circuit includes an NMOS transistor connected to a supply voltage pin through a first node and connected to a ground pin through a second node, an RC circuit connected in parallel with the NMOS transistor and including a capacitor and a resistor, and a clamping circuit connected in parallel with the resistor of the RC circuit and including a plurality of diodes; and a switch connecting the clamping circuit to a gate node of the NMOS transistor, wherein a number of the plurality of diodes is set based on a breakdown voltage and an operating voltage of an internal circuit to be protected by the ESD protection circuit, and the switch includes a PMOS transistor connecting the gate node of the NMOS transistor to the clamping circuit and a sub-RC circuit connected in parallel with the PMOS transistor and including a sub-capacitor and a sub-resistor.