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A power on reset circuit composed of a power supply voltage sensing circuit, a capacitor charging circuit and an output circuit, the internal structure of such components as a power supply voltage sensing circuit, a capacitor charging circuit and an output circuit having a various variety but the ba

A power on reset circuit composed of a power supply voltage sensing circuit, a capacitor charging circuit and an output circuit, the internal structure of such components as a power supply voltage sensing circuit, a capacitor charging circuit and an output circuit having a various variety but the basic concept of the power on reset circuit being on an idea to delay the time to charge a capacitor until the voltage of the power supply has increased to a certain level.

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[ What is claimed is:] [4.] A power on reset circuit comprising:a first transistor having a first electrode, a second electrode and a control electrode, the first electrode of said first transistor being connected to a first voltage supplied node, the second electrode of said first transistor being

[ What is claimed is:] [4.] A power on reset circuit comprising:a first transistor having a first electrode, a second electrode and a control electrode, the first electrode of said first transistor being connected to a first voltage supplied node, the second electrode of said first transistor being connected to a first node, the control electrode of said first transistor being connected to a second node;a second transistor having a first electrode, a second electrode and a control electrode, the first electrode of said second transistor being coupled to said first voltage supplied node, the second electrode of said second transistor being connected to said second node, the control electrode of said second transistor being connected to said first node;a capacitor connected between said second node and a second voltage supplied node;a third transistor having a first electrode, a second electrode and a control electrode, the first electrode of said third transistor being connected to said second node, the second electrode of said third transistor being connected to said second voltage supplied node, the control electrode of said third transistor being connected to said first voltage supplied node;a rectifier circuit connected between said first node and said second voltage supplied node.