摘要:
Either the power-supply potential or a ground potential is applied to a power-supply node through a switch. When a potential higher than the ground potential is applied to the output terminal while an power-supply node is connected to the ground-potential node, the potential of a back gate of a first PMOS transistor incorporated in an output section increases in accordance with the potential of the output terminal, due to the pn-junction provided between a drain and back gate of the first PMOS transistor. At this time, a second PMOS transistor whose source-drain path is connected between the back gate and gate of the first PMOS transistor is turned on, whereby the potential of the back gate of the first PMOS transistor is transferred to the gate thereof.
摘要:
An auto-clear circuit which has a switch device connected between a power supply voltage terminal and first and second nodes, and a potential division device, connected between the first node and a ground terminal, for outputting a first potential obtained by dividing a potential of the first node. Also included is a charge/discharge device, connected between the second node and a ground terminal, for charging or discharging the second node on the basis of the first potential output from the potential division device, and a latch device for holding a potential of the second node to output a signal from an output terminal, and supplying the signal to the switch device to control an opening/closing operation.
摘要:
An output buffer circuit includes a first output buffer having a high output resistance determined by DC specifications, a second output buffer having an output resistance satisfying AC specifications when simultaneously driven with the first output buffer, and a control circuit for controlling an operation of the second output buffer. An input signal is supplied to the input node of the first output buffer, and the output node of the first output buffer is connected to an output terminal. The output node of the second output buffer is connected to the output terminal. The control circuit is responsive to the potential of the input signal or of the output terminal to control the operation of the second output buffer. The control circuit drives the second output buffer when the output from the first output buffer is changed, and sets the output from the second output buffer in the high impedance state when the output from the first output buffer is stationary.
摘要:
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.
摘要:
A semiconductor device of an embodiment of the invention has a package substrate, and a semiconductor chip mounted on the package substrate. The semiconductor chip has an output section, and a filter section for decreasing the electromagnetic noise generated from the data communication path. The output section outputs a data signal into the data communication path, and has a buffer amplifier section for compensating the data signal.
摘要:
A semiconductor device of an embodiment of the invention has a package substrate, and a semiconductor chip mounted on the package substrate. The semiconductor chip has an output section, and a filter section for decreasing the electromagnetic noise generated from the data communication path. The output section outputs a data signal into the data communication path, and has a buffer amplifier section for compensating the data signal.
摘要:
A protection circuit (1) for input comprises two transistors (11, 12) connected in series between a first voltage supply (V.sub.cc) and a second voltage supply (GND), and an intermediate junction point is used as an input terminal and an output terminal. When a surge voltage is applied to the input terminal, since terminals (51, 53) of the two transistors (11, 12) are connected to predetermined junction points in such a way that the transistors can operate as bipolar transistors or cause punch through phenomenon (without causing breakdown operation of a low response speed to surge voltage), the surge voltage can be absorbed at high speed, thus increasing anti-ESD (electro static discharge) rate. Further, a protection circuit for power supply comprises two transistors (31, 32) connected in parallel to each other between a first voltage supply (V.sub.cc) and a second voltage supply (GND). Similarly, the terminals (65, 68) of the two transistors are connected to predetermined junction points in such a way that when a surge voltage is superimposed upon the supply voltage, at least one of the transistors can operate as a bipolar transistor, without causing breakdown operation.
摘要:
At least one slit having a predetermined shape is formed around a contact region of a lower wiring layer formed on a substrate, and an insulating portion formed integrally with an insulating layer is embedded in this slit. This insulating layer is formed on the lower wiring layer and has a contact hole located at a position corresponding to the contact region. Since the insulating portion as a rectangular projecting portion projects into the slit downwardly from the rigid insulating layer, positional errors caused by thermal expansion of the lower wiring layer in annealing of the upper wiring layer can be suppressed, and an abnormal geometry such as a projection on the upper wiring layer can be prevented. In addition, a semiconductor device free from interwiring short-circuiting and excellent in flatness can be obtained.
摘要:
A protection circuit including a power supply terminal supplied with a power supply potential, a reference terminal supplied with a reference potential, and a first p-channel MOS transistor having a first gate, a first source, a first drain and a first back gate. The first gate, the first source and the first back gate are connected to the power supply terminal. Also included is a second p-channel MOS transistor having a second gate, a second source, a second drain and the first back gate, in which the second source of the second p-channel MOS transistor is connected to the first drain of the first p-channel MOS transistor, and the second gate and the second drain of the second p-channel MOS transistor is connected to the reference terminal. The circuit also includes a first n-channel MOS transistor having a third gate, a third source, a third drain and a second back gate, in which the third gate, in which the third source and the second back gate of the first n-channel MOS transistor are connected to the reference terminal, and including a second n-channel MOS transistor having a fourth gate, a fourth source, a fourth drain and the second back gate, in which the fourth source of the second n-channel MOS transistor are connected to the third drain of the first n-channel MOS transistor, and the fourth gate and the fourth drain of the second n-channel MOS transistor are connected to the power supply terminal.
摘要:
A temperature detector circuit for converting a forward drop voltage of a diode to digital data by means of an AD converter is provided. In order to restrict an occurrence of an output error caused by dispersion in diode manufacture, correction data according to digital data obtained by the AD converter is stored in advance in a storage circuit under a known arbitrary temperature condition, and subtraction is performed between digital data obtained by the AD converter under an unknown temperature condition and correction data read from a storage circuit, thereby to perform correction.