OUTPUT BUFFER CIRCUIT

摘要

PURPOSE: To obtain an output buffer circuit for high speed transfer with low noise in which an output signal is not fully swung. CONSTITUTION: A 1st switch 101 and a 2nd switch 102 are arranged in series between a couple of power supply terminals, and an external output buffer 100 is configured by a voltage divider circuit 120 in which a coupling point between the 1st switch 101 and the 2nd switch 102 is connected to an output terminal X of an output circuit 110 and an external terminal Z as a voltage dividing point Y, the output circuit 110 and the external terminal Z. A 2nd control signalϕOUT used to turn on the 1st switch 101 and the 2nd switch 102 is fed to the voltage divider circuit 120 for a prescribed period just before a 1st control signal D allowing the output operation of the output circuit 110 is fed to allow the voltage division circuit 120 to set a potential of the voltage dividing point Y to a desired level before the output signal OUT is outputted.