US 4,791,321 AGranted

CMOS output circuit device

AssigneesKabushiki Kaisha Toshiba, Tosbac Computer System Co., Ltd.

InventorsYasunori Tanaka, Yukinori Uchino, Hideo Hashimoto

Life of this patent

Estimating the term…

Loading patent…

Abstract

A signal output circuit device according to the present invention comprises a first MOS transistor whose conduction is controlled by the potential given to its gate terminal, and gives the high level potential that is supplied by a high level voltage source to the output terminal, a diode which is inserted between the high level voltage source and the first MOS transistor so as to have its forward direction in the direction from the high level voltage source to the first MOS transistor, a second MOS transistor whose conduction is controlled by the potential given to its gate terminal, and supplies the low level potential supplied by a low level voltage source to the output terminal, and a diode which is inserted between the low level voltage source and the second MOS transistor so as to have its forward direction in the direction from the second MOS transistor to the low level voltage source.

Claims6

Dependent claims

A signal output circuit device, comprising:

a first type MOS transistor having a source, a control gate, and a drain;
a second type MOS transistor having a source, a control gate, and a drain;
the control gates of said first and second type MOS transistors being connected together to an input terminal, the source of said first type MOS transistor being connected to a first power supply having a first polarity, the source of said second type MOS transistor being connected to a second power supply having a second polarity, the drains of said first and second type MOS transistors being connected together so as to produce an output signal on a common line;
a first diode which is inserted in the forward direction between the first power supply and the source of said first type MOS transistor;
a second diode which is inserted in the forward direction between the source of said second type MOS transistor and the second power supply;
and
a capacitor, one terminal of which is connected to said common output line and the other terminal of which is connected to ground, thereby suppressing both overshoot and undershoot phenomena when said first and second type MOS transistors are changed-over from one condition to the other condition in accordance with an input signal,
wherein said first type MOS transistor is a P-MOS transistor and said second type MOS transistor is an NMOS transistor.

5 more elements

A signal output circuit device comprising:

a first type first MOS transistor having a source, a control gate, and a drain;
a second type second MOS transistor having a source, a control gate, and a drain;
a first type third MOS transistor having a source, a control gate, and a drain;
a second type fourth transistor having a source, a control gate, and a drain;
the control gates of said first type first MOS transistor and said second type second MOS transistor being connected together to an input terminal, the source of said first type first MOS transistor being connected to a first power supply having a first polarity, said source of the second type second MOS transistor being connected to a second power supply having a second polarity, the drains of said first and second type first and second MOS transistors being connected together in communication with a common output line, the control gates of said first and second type third and fourth MOS transistors being connected to the input terminal, the source of said first type third MOS transistor being connected to the first power supply having the first polarity, the source of said second type fourth MOS transistor being connected to the second power supply having the second polarity, and the drains of said first and second type third and fourth MOS transistors being connected together to the drains of said first and second type first and second MOS transistors;
a first diode which is inserted in the forward direction between the first power supply and the source of said first type first MOS transistor (1);
a second diode which is inserted in the forward direction between the source of said second type second MOS transistor and the second power supply;
and
a capacitor, one terminal of which is connected to the common output line and the other terminal of which is connected to the ground, thereby suppressing both overshoot and undershoot phenomena and permitting the level of an output signal on the common output line to change both to the voltage value of the first power supply having the first polarity and to the voltage value of the second power supply having the second polarity when said first and second type first and second MOS transistors are changed-over from one condition to the other condition in accordance with an input signal.

6 more elements

Signal output circuit device, comprising:

a first type first MOS transistor having a source, a control gate, and a drain;
a second type second MOS transistor having a source, a control gate, and a drain;
a first type third MOS transistor having a source, a control gate, and a drain;
a second type fourth transistor having a source, a control gate, and a drain;
the control gates of said first type first MOS transistor and said second type second MOS transistor being connected together to an input terminal, the source of said first type first MOS transistor being connected to a first power supply having a first polarity, said source of the second type second MOS transistor being connected to a second power supply having a second polarity, the drains of said first and second type first and second MOS transistors being connected together in communication with a common output line, the control gates of said first and second type third and fourth MOS transistors being connected to the input terminal, the source of said first type third MOS transistor being connected to the first power supply having the first polarity, the source of said second type fourth MOS transistor being connected to the second power supply having the second polarity, and the drains of said first and second type third and fourth MOS transistors being connected together to the drains of said first and second type first and second MOS transistors;
a first diode which is inserted in the forward direction between the first power supply and the source of said first type first MOS transistor;
a second diode which is inserted in the forward direction between the source of said second type second MOS transistor and the second power supply;
and
a capacitor, one terminal of which is connected to the common output line and the other terminal of which is connected to the ground, thereby suppressing both overshoot and undershoot phenomena and permitting the level of an output signal on the common output line to change both to the voltage value of the first power supply having the first polarity and to the voltage value of the second power supply having the second polarity when said first and second type first and second MOS transistors are changed-over from one condition to the other condition in accordance with an input signal,
wherein said first type MOS transistors are P-MOS transistors and said second type MOS transistors are N-MOS transistors.

7 more elements

A signal output circuit device, comprising:

a first type first MOS transistor having a source, a control gate, and a drain;
a second type second MOS transistor having a source, a control gate, and a drain;
a first type third MOS transistor having a source, a control gate, and a drain;
a second type fourth transistor having a source, a control gate, and a drain;
the control gates of said first type first MOS transistor and said second type second MOS transistor being connected together to an input terminal, the source of said first type first MOS transistor being connected to a first power supply having a first polarity, said source of the second type second MOS transistor being connected to a second power supply having a second polarity, the drains of said first and second type first and second MOS transistors being connected together in communication with a common output line, the control gates of said first and second type third and fourth MOS transistors being connected to the input terminal, the source of said first type third MOS transistor being connected to the first power supply having the first polarity, the source of said second type fourth MOS transistor being connected to the second power supply having the second polarity, and the drains of said first and second type third and fourth MOS transistors being connected together to the drains of said first and second type first and second MOS transistors;
a first diode which is inserted in the forward direction between the first power supply and the source of said first type first MOS transistor;
a second diode which is inserted in the forward direction between the source of said second type second MOS transistor and the second power supply;
and
a capacitor, one terminal of which is connected to the common output line and the other terminal of which is connected to the ground, thereby suppressing both overshoot and undershoot phenomena and permitting the level of an output signal on the common output line both to the voltage value of the first power supply having the first polarity and to the voltage value of the second power supply having the second polarity when said first and second type first and second MOS transistors are changed-over from one condition to the other condition in accordance with an input signal,
wherein semiconductor portions corresponding to said first and second diodes and semiconductor portions corresponding to at least a pair of said first and second type MOS transistors are diffused on a common sapphire substrate in parallel with each other on said substrate.

7 more elements

Dependencies are inferred from the claim text.