Output or bidirectional buffer circuit which tolerates an external input voltage that is higher than an internal power supply voltage

摘要

A semiconductor integrated circuit includes a first transistor coupled between the electrical source terminal and the output terminal. The first transistor provides an output signal based on a power supply voltage to the output terminal. The semiconductor integrated circuit further includes a second transistor coupled with a control electrode of the first transistor and the output terminal. The semiconductor integrated circuit still further includes a voltage adjusting circuit coupled between the output terminal and a control electrode of the second transistor. The voltage adjusting circuit turns ON the second transistor when the output terminal receives an external voltage which is higher than the power supply voltage.