Semiconductor equipment and power supply systems

Abstract

The present invention provides a semiconductor device and power supply system that can extend the period of high potential levels of an input signal without requiring the supply of a high-potential power supply voltage. [Solution] The rectifier circuit 15 transmits the control signal Vs from the control input terminal PNin to the power supply wiring PL and blocks the current path in the reverse direction. The voltage detection circuit 16 generates a detection voltage Vdet by resistively dividing the output voltage Vo applied to the power supply wiring PL and compares its magnitude with the determination voltage Vjg. The voltage detection circuit 16 sets the enable signal CE to the "H" level if "Vdet > Vjg", and "Vdet

Claims

1. A control input terminal for inputting a first control signal that transitions between a high potential level and a low potential level, A control output terminal that outputs a second control signal, A power supply wiring to which the high-potential output voltage generated from the first control signal is applied, Power terminals connected to the aforementioned power wiring, A grounded power supply terminal to which a low-potential power supply voltage is supplied, A rectifier circuit is connected between the control input terminal and the power supply wiring, transmits the first control signal from the control input terminal to the power supply wiring, and blocks the current path from the power supply wiring to the control input terminal. A voltage detection circuit connected to the power supply wiring generates a detection voltage by resistively dividing the output voltage on the high-potential side, controls the second control signal to the high-potential level when the detection voltage is higher than the determination voltage, and controls the second control signal to the low-potential level when the detection voltage is lower than the determination voltage. Equipped with, The capacitor, to which the low-potential power supply voltage is supplied on one end, has its other end connected to the power supply terminal, and is used with a discharge resistor connected between the power supply terminal or the control output terminal and the control input terminal. Semiconductor equipment.

2. In the semiconductor device described in claim 1, The voltage detection circuit is A resistive voltage divider circuit that generates the detection voltage by resistively dividing the output voltage on the high potential side, A comparator circuit that operates at the output voltage on the high potential side and compares the detection voltage with the determination voltage, A CMOS inverter circuit controls the second control signal to the level of the output voltage on the high-potential side or the power supply voltage on the low-potential side based on the comparison result of the comparator circuit, Equipped with, Semiconductor equipment.

3. In the semiconductor device described in claim 2, The comparator circuit includes a MOSFET that inputs the detection voltage to its gate. The determination voltage is determined based on the gate-source threshold voltage of the MOSFET. Semiconductor equipment.

4. In the semiconductor device described in claim 3, The aforementioned resistance voltage divider circuit is configured to change the resistance voltage divider ratio according to the comparison result of the comparator circuit. Semiconductor equipment.

5. In the semiconductor device described in claim 1, The rectifier circuit described above is A p-channel MOSFET forms a source-drain path between the control input terminal and the power supply wiring, A reverse current prevention circuit that prevents reverse current from the power supply wiring to the control input terminal by comparing the voltage at the control input terminal with the high-potential output voltage applied to the power supply wiring, and controlling the back gate voltage or gate voltage of the p-channel MOSFET based on the comparison result, Equipped with, Semiconductor equipment.

6. In the semiconductor device described in claim 1, The discharge resistor is connected between the power supply terminal and the control input terminal. The semiconductor device further includes a pull-down element for applying the low-potential power supply voltage to the control output terminal when the control output terminal is of high impedance. Semiconductor equipment.

7. A delay device that receives a first control signal that transitions between a high potential level and a low potential level, and outputs a second control signal that is a signal in which the period of the high potential level in the first control signal is extended. A specified load device and A power supply device that receives an external power supply voltage and supplies the power supply voltage to the load device during the period of the high potential level of the second control signal, Capacitors and resistors for discharge, A power supply system having, The delay device is A control input terminal for inputting the first control signal, A control output terminal that outputs the second control signal, A power supply wiring to which the high-potential output voltage generated from the first control signal is applied, Power terminals connected to the aforementioned power wiring, A grounded power supply terminal to which a low-potential power supply voltage is supplied, A rectifier circuit is connected between the control input terminal and the power supply wiring, transmits the first control signal from the control input terminal to the power supply wiring, and blocks the current path from the power supply wiring to the control input terminal. A voltage detection circuit connected to the power supply wiring generates a detection voltage by resistively dividing the output voltage on the high-potential side, controls the second control signal to the high-potential level when the detection voltage is higher than the determination voltage, and controls the second control signal to the low-potential level when the detection voltage is lower than the determination voltage. Equipped with, The capacitor has the low-potential power supply voltage supplied to one end and the other end connected to the power supply terminal. The discharge resistor is connected between the power supply terminal or the control output terminal and the control input terminal. Power supply system.

8. In the power supply system according to claim 7, The voltage detection circuit is A resistive voltage divider circuit that generates the detection voltage by resistively dividing the output voltage on the high potential side, A comparator circuit that operates at the output voltage on the high potential side and compares the detection voltage with the determination voltage, A CMOS inverter circuit controls the second control signal to the level of the output voltage on the high-potential side or the power supply voltage on the low-potential side based on the comparison result of the comparator circuit, Equipped with, Power supply system.

9. In the power supply system according to claim 7, The load device receives the first control signal and performs a predetermined operation in response to the transition of the first control signal to the low potential level. Power supply system.

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