an integrated circuit includes first and second pads that are electrically connected to a circuit inside the integrated circuit . the circuit performs multiple functions which may be selected . a function identification circuit , inside the integrated circuit , is electrically connected to the first and second pads . the function identification circuit operates in multiple modes , wherein each operating mode corresponds to a function performed by the circuit . the function of the circuit may thereby be identified using fewer pads which may allow a reduction in the cost of the integrated circuit .