Kabushiki Kaisha Toshiba

Takumi Tsukazaki

Masanori Kinugasa

Toru Fujii

Akira Takiba

Masaru Mizuta

Masato Fukuoka

An analog switch circuit includes: an analog switch composed of a first P-channel MOS transistor and a first N-channel transistor, a gate of which receives a control signal; a comparison circuit comparing potentials of a first input-output-terminal and a second input-output terminal, and conveying a higher potential to a well where the first P-channel MOS transistor is formed; a first potential conveying circuit conveying a potential of the well where the first P-channel MOS transistor is formed to a gate of the first P-channel MOS transistor when the analog switch is in the OFF state; a second potential conveying circuit operating on the basis of a control signal to convey the potential of the well where the first P-channel MOS transistor is formed to the gate of the first P-channel MOS transistor to turn off the first P-channel MOS transistor; and a third potential conveying section operating on the basis of the control signal to turn on the first P-channel MOS transistor.

Analog switch circuit

A bus buffer has a controller to generate several control signals; a first terminal via which a first-directional signal is input whereas a second-directional signal is output; a second terminal via which the first-directional signal is output whereas the second-directional signal is input; a first-directional signal processor, provided between the first and second terminals, having a first internal circuit and a first output buffer; a second-directional signal processor, provided between the second and first terminals, having a second internal circuit and a second output buffer; a first input buffer having a first input holder to disactivate the first internal circuit and the first output buffer by using at least one of the control signals; and a second input buffer having a second input holder to disactivate the second internal circuit and the second output buffer by using the at least one control signal, for holding the input to the input buffers at a certain level to decrease a current to pass these circuits, thus achieving low power consumption.

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Oita, Japan

Takumi Tsukazaki