Output circuit of semiconductor circuit with power consumption reduced

An output circuit of a semiconductor circuit, comprising:

• a higher potential side power supply line;
• an output signal line on which an output signal is outputted;
• a control signal line on which a control signal is transferred;
• a gate signal line on which a gate signal is transferred;
• an output transistor connected between said higher potential side power supply line and said output signal line to operate in response to said gate signal on said gate signal line;
• a first switch connected to said higher potential side power supply line to turn off in response to said control signal of a first state and turn on in response to said control signal of a second state;
• and
• a gate drive circuit connected between said first switch and said control signal line to generate said gate signal onto said gate signal line based on a gate control signal when said first switch is turned on,
• wherein said first switch comprises a first P-channel transistor, and
• said control signal is supplied directly to a gate of said first P-channel transistor.

An output circuit of a semiconductor circuit, comprising:

• a higher potential side power supply line;
• an output signal line on which an output signal is outputted;
• a control signal line on which a control signal is transferred;
• a gate signal line on which a gate signal is transferred;
• an output transistor connected between said higher potential side power supply line and said output signal line to operate in response to said gate signal on said gate signal line;
• a first switch connected to said higher potential side power supply line to turn off in response to said control signal of a first state and turn on in response to said control signal of a second state;
• a gate drive circuit connected between said first switch and said control signal line to generate said gate signal onto said gate signal line based on a gate control signal when said first switch is turned on;
• and
• second and third resistances connected between said higher potential side power supply line and said control signal line in series,
• wherein said first switch comprises a first P-channel transistor, and
• said control signal is supplied to a gate of said first P-channel transistor via said third resistance.

An output circuit of a semiconductor circuit, comprising:

• a higher potential side power supply line;
• an output signal line on which an output signal is outputted;
• a control signal line on which a control signal is transferred;
• a gate signal line on which a gate signal is transferred;
• an output transistor connected between said higher potential side power supply line and said output signal line to operate in response to said gate signal on said gate signal line;
• a first switch connected to said higher potential side power supply line to turn off in response to said control signal of a first state and turn on in response to said control signal of a second state;
• a gate drive circuit connected between said first switch and said control signal line to generate said gate signal onto said gate signal line based on a gate control signal when said first switch is turned on;
• and
• a control circuit connected between said higher potential side power supply line and said control signal line to generate said gate control signal from said control signal.

An output circuit of a semiconductor circuit, comprising:

• a higher potential side power supply line;
• an output signal line on which an output signal is outputted;
• a control signal line on which a control signal is transferred;
• a gate signal line on which a gate signal is transferred;
• an output transistor connected between said higher potential side power supply line and said output signal line to operate in response to said gate signal on said gate signal line;
• a first switch connected to said higher potential side power supply line to turn off in response to said control signal of a first state and turn on in response to said control signal of a second state;
• a gate drive circuit connected between said first switch and said control signal line to generate said gate signal onto said gate signal line based on a gate control signal when said first switch is turned on;
• a lower potential side power supply line;
• and
• a control circuit connected between said higher potential side power supply line and said lower potential side power supply line, to generate said gate control signal from said output signal in addition to said control signal.

An output circuit of a semiconductor circuit, comprising:

• a higher potential side power supply line;
• an output signal line on which an output signal is outputted;
• a control signal line on which a control signal is transferred;
• a gate signal line on which a gate signal is transferred;
• an output transistor connected between said higher potential side power supply line and said output signal line to operate in response to said gate signal on said gate signal line;
• a first switch connected to said higher potential side power supply line to turn off in response to said control signal of a first state and turn on in response to said control signal of a second state;
• a gate drive circuit connected between said first switch and said control signal line to generate said gate signal onto said gate signal line based on a gate control signal when said first switch is turned on;
• a lower potential side power supply line;
• and
• a third switch connected between said higher potential side power supply line and said lower potential side power supply line to generate said control signal of said first state based on a supplied control signal of said second state and to generate said control signal of said second state based on said supplied control signal of said first state and outputs said control signal onto said control signal line.