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1. A physically unclonable function (PUF) device, comprising: first and second inverters, each of the first and second inverters comprising: a common gate node; and a common drain node, wherein the common drain node of the first inverter is electrically connected to the common gate node of the second inverter, and wherein the first and second inverters are connected in series between the common gate node of the first inverter and the common drain node of the second inverter and configure to induce a voltage change at the common drain node of the second inverter by a voltage change at the common gate node of the first inverter through a voltage change at the common drain node of the first inverter; a common output node; a first resistive memory device (RMD) electrically connected directly to the common drain node of the first inverter and directly to the common output node; and a second RMD electrically connected directly to the common drain node of the second inverter and directly to the common output node, wherein the first inverter is configured to receive a programming voltage and the common output node is configured to float in a randomized programming operation.
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