Pull-up circuit and related method
AssigneeTaiwan Semiconductor Manufacturing Company, Ltd.
InventorMing Hsien Tsai
Life of this patent
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Abstract
A device includes a pull-up circuit, first and second switches, and a feedback circuit. The pull-up circuit has a first terminal electrically coupled to a pad, and a second terminal electrically coupled to a first power node. The first switch has a first terminal electrically coupled to a first control terminal of the pull-up circuit, and a second terminal electrically coupled to a second control terminal of the pull-up circuit. The feedback circuit has a first terminal electrically coupled to the pad, and a feedback terminal. The second switch has a first terminal electrically coupled to the first control terminal of the pull-up circuit, a second terminal electrically coupled to the feedback terminal of the feedback circuit, and a control terminal electrically coupled to a second power node.
Claims20
A device comprising:
- a pull-up circuit having:
- a first terminal electrically coupled to a pad;
- a second terminal electrically coupled to a first power node;
- a first control terminal;
- and
- a second control terminal;
- a first switch having:
- a first terminal electrically coupled to the first control terminal of the pull-up circuit;
- a second terminal electrically coupled to the second control terminal of the pull-up circuit;
- and
- a control terminal;
- a feedback circuit having:
- a first terminal electrically coupled to the pad;
- and
- a feedback terminal;
- a second switch having:
- a first terminal electrically coupled to the first control terminal of the pull-up circuit;
- a second terminal electrically coupled to the feedback terminal of the feedback circuit;
- and
- a control terminal electrically coupled to a second power node.
A device comprising:
- a first switch having:
- a first terminal electrically coupled to a first control terminal;
- and
- a second terminal electrically coupled to a second control terminal;
- a second switch having:
- a first terminal electrically coupled to the first terminal of the first switch and the first control terminal;
- and
- a control terminal electrically coupled to a first power node;
- a pull-up circuit having the first control terminal and the second control terminal;
- and
- a feedback circuit having:
- a first terminal electrically coupled to a pad;
- and
- a second terminal electrically coupled to a second terminal of the second switch.
A device comprising:
- a first switch having:
- a first terminal;
- a second terminal;
- and
- a control terminal electrically coupled to a first power node;
- a feedback circuit having:
- a first terminal electrically coupled to the first terminal of the first switch;
- and
- a second terminal electrically coupled to a pad;
- a pull-up circuit having:
- a control terminal electrically coupled to the second terminal of the first switch;
- and
- a first pull-up circuit switch electrically coupled to a second pull-up circuit switch;
- a first voltage source that:
- sources a first voltage level to the first power node to switch in a feedback signal from the first terminal of the first switch to the second terminal of the first switch, and sources a second voltage level to the first power node to open the first switch;
- and
- a level shifter having a first terminal electrically coupled to a control terminal of a second switch, wherein the level shifter:
- isolates a second terminal of the level shifter from the control terminal of the pull-up circuit, and electrically couples the second terminal of the level shifter to the control terminal of the pull-up circuit.
Dependencies are inferred from the claim text.