Semiconductor device including i/o system, and method of operating the same

An input/output (I/O) system comprising:

• an output level shifter coupled between an output node of a core circuit and a first node;
• an output driver coupled between the first node and an external terminal of the I/O system;
• and
• a gating signal generator configured to provide an output driver gating signal to the output driver, wherein:
• the output driver gating signal is based on a logic operation on a first signal and a second signal,
• the first signal being an inverted signal of a first timing signal, which is a delayed signal of a power-on control signal, and
• the second signal being an inverted signal of a second timing signal, which is a delayed signal of the first timing signal.

A method of operating an input/output (I/O) system, the method comprising:

• delaying a power-on control signal to generate a first timing signal;
• inverting the first timing signal to generate a first inverted timing signal;
• delaying the first timing signal to generate a second timing signal;
• inverting the second timing signal to generate a second inverted timing signal
• performing a logic operation on the first inverted timing signal and the second inverted timing signal to generate an output driver gating signal;
• and
• providing the output driver gating signal to an output driver of the I/O system.