Semicondutor integrated circuit device
AssigneeRenesas Electronics Corporation
InventorsYusuko Kanno, Kazuo Tanaka, Shunsuke Toyoshima, Takeo Toba
Life of this patent
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Abstract
A semiconductor integrated circuit device including an I/O circuitry capable of low-voltage high-speed operation at low cost is provided. In the I/O circuitry, when an I/O voltage (for example, 3.3 V) is lowered to a predetermined voltage (for example, 1.8 V), portions causing a speed deterioration are a level conversion unit and a pre-buffer unit for driving a main large-sized buffer. In view of this, a high voltage is applied to a level up converter and a pre-buffer circuit. By doing so, it is possible to achieve an I/O circuitry capable of low-voltage high-speed operation at low cost.
Claims4
A semiconductor integrated circuit device comprising:
- a first circuit that outputs a first signal which varies between a ground voltage and a second voltage higher than the ground voltage;
- a first conversion circuit that receives the first signal and that outputs a second signal which varies between the ground voltage and a third voltage higher than the second voltage;
- a first output circuit that receives the second signal and that outputs a third signal which varies between the ground voltage and a fourth voltage between the second voltage and third voltage;
- a second circuit that outputs a fourth signal which varies between the ground voltage and the second voltage;
- a second conversion circuit that receives the fourth signal and that outputs a fifth signal which varies between the ground voltage and the third voltage;
- and
- a second output circuit that receives the fifth signal and that outputs a sixth signal which varies between the ground voltage and a fifth voltage between the second voltage and fourth voltage,
- wherein the first and second circuits are supplied with the ground voltage and the second voltage,
- wherein the first and second conversion circuits are supplied with the ground voltage and the third voltage,
- wherein the first output circuit is supplied with the ground voltage and the fourth voltage, and
- wherein the second output circuit is supplied with the ground voltage and the fifth voltage.
A semiconductor integrated circuit device comprising:
- a first circuit that outputs a first signal which varies between a ground voltage and a second voltage higher than the ground voltage;
- a first conversion circuit that receives the first signal and that outputs a second signal which varies between the ground voltage and a third voltage higher than the second voltage;
- a first output circuit that receives the second signal and that outputs a third signal which varies between the ground voltage and a fourth voltage between the second voltage and third voltage;
- a second circuit that outputs a fourth signal which varies between the ground voltage and the second voltage;
- a second conversion circuit that receives the fourth signal and that outputs a fifth signal which varies between the ground voltage and the third voltage;
- and
- a second output circuit that receives the fifth signal and that outputs a sixth signal which varies between the ground voltage and the third voltage,
- wherein the first and second circuits are supplied with the ground voltage and the second voltage,
- wherein the first and second conversion circuits and the second output circuit are supplied with the ground voltage and the third voltage, and
- wherein the first output circuit is supplied with the ground voltage and the fourth voltage.
Dependencies are inferred from the claim text.