Semiconductor device
AssigneeMitsubishi Denki Kabushiki Kaisha
InventorTakeshi Kajimoto
Life of this patent
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Abstract
An external voltage is supplied to a power terminal of a semiconductor chip and is applied to a semiconductor circuit and a regulator circuit. An output control signal is supplied from semiconductor circuit to an output circuit. According to an RD signal output from semiconductor circuit, regulator circuit applies an output voltage obtained by decreasing external voltage to output circuit, thereby enabling power source noise caused in association with the operation of output circuit to be absorbed by regulator circuit without adding an external power terminal dedicated to output circuit.
Claims19
A semiconductor device including an output circuit, comprising:
- a semiconductor circuit for supplying an output control signal to said output circuit;
- a first power terminal to which a first source potential to be applied to said semiconductor circuit is supplied from the outside;
- a second power terminal to which a second source potential to be applied to said semiconductor circuits is supplied from the outside;
- and
- a power circuit supplying to said output circuit a prescribed power supply potential obtained by shifting said first power supply potential toward said second power supply potential;
- said power circuit including a transistor for control, dividing the voltage between an output potential and said second power supply potential, controlling on-state resistance of said transistor by using a potential difference between the potential obtained by the dividing operation and said output potential, and outputting the predetermined power supply potential.
A semiconductor device including an output circuit, comprising:
- a semiconductor circuit for supplying an output control signal to said output circuit;
- a power terminal to which a source voltage to be applied to said semiconductor circuit is supplied from the outside;
- and
- a power circuit including a comparing circuit for comparing an output potential to be applied to said output circuit with a predetermined reference potential;
- and a drive transistor for controlling said output potential to be a predetermined source potential lower than said source voltage applied to said power terminal in accordance with a comparison output of said comparing circuit.
A semiconductor device including an output circuit, comprising:
- a semiconductor circuit for supplying an output control signal to said output circuit;
- a power terminal to which a source voltage to be applied to said semiconductor circuit and said output circuit is supplied from the outside;
- a ground terminal connected to an external ground potential;
- and
- a power circuit including a comparing circuit for comparing an output ground potential to be applied to said output circuit with a predetermined reference potential, and a drive transistor for controlling said output ground potential to be a predetermined potential higher than a ground potential of said ground terminal in accordance with a comparison output of said comparing circuit.
Dependencies are inferred from the claim text.