Abstract: An integrated circuit device includes an input circuit; logic circuitry coupled to the input circuit; an output circuit coupled to the logic circuitry; and a select circuit coupled to the input circuit, output circuit and logic circuitry. The select circuit generates a select signal that causes the input circuit, output circuit and logic circuit to operate according to a first state or a second state. The output buffer is configured to receive the select signal which selects output buffer operation at the first state or the second state. The output buffer is also configured to maintain a constant slew rate while operating in either the first or second state.