Output buffer for controlling external capacitive load, has cutoff unit with detection unit controlling control unit to cut connection between power supply and output when external voltage is greater than internal voltage supplied by supply

摘要

The buffer has a cutoff unit (13) with a control unit (17) having a PMOS transistor for connecting an internal power supply (15) with an output (14) of the buffer. The unit (13) has a detection unit (16) controlling the control unit to cut a connection (131) between the power supply and the output, when the output receives an external voltage that is greater than an internal voltage delivered by the power supply. An independent claim is also included for an integrated circuit having an output buffer.