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IO library comprises of IO cells- which have some additional circuitry like output enable, ESD protection etc..
It has additional components like : IO_Voltage which is the voltage that runs in the rails and is usually higher than the core voltage. The cells have the following :-
rail connection (ie. connected to IO voltage/core voltage)
leakage power for botht the voltages
area , pad_cell== true,
it has pins and their charecteristics same as std cell library like direction, input signal strength, capacitance, drive strength (for PAD)
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