PURPOSE: To obtain a control circuit for an electronic switch with simple constitution ensuring the power-on reset of a control object circuit by using a control confirming signal representing the on-state of the control object circuit so as to control an off-signal only when the power supply of the control object rises completely.
CONSTITUTION: When a voltage level transits from a low level to a high level at an on-signal input terminal 1, a high level is outputted at a control signal output terminal 3 and the control object circuit is turned on. Thus, the high level signal representing the on-state switching of the control object circuit is inputted to the control confirmation signal terminal 4, and then an output of an off-signal to the control confirmation signal terminal 4 is attained. Before the high level signal representing the power voltage of the control object circuit reaching a voltage VDD and the control object circuit to be switched is inputted to the control confirmation signal terminal 4, even if the voltage level transits from the low level to the high level at the off-signal input terminal 2, no low level is outputted to the output control signal output terminal 3.
INOUE YASUHIKO
ASADA TSUNEYOSHI
