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US 7,888,988 B2Granted
Fuse circuit
AssigneeRenesas Electronics Corporation
InventorsKenji Mori, Masayuki Takori
Life of this patent
Estimating the term…
Abstract
A fuse circuit includes a first power supply line, a second power supply line, a first current source connected between the first power supply line and an output terminal, a second current source connected between the second power supply line and the output terminal, the second current source having higher current supply capacity or current draw-out capacity than the first current source, and a fuse connected in series with the second current source between the second power supply line and the output terminal.
Claims10
A fuse circuit, comprising:
- a first power supply line;
- a second power supply line;
- a first transistor coupled between said first and second power supply lines to output a first output current;
- a second transistor coupled between said first and second power supply lines and coupled to said first transistor to output a second output current;
- a fuse coupled in series with said first transistor or said second transistor between said first and second power supply line;
- another fuse coupled to said second power supply line;
- an output terminal coupled to a node between said first and second transistors to output a signal in accordance with a magnitude relationship of the first output current and the second output current, wherein said magnitude relationship is inverted based on a size ratio of said second transistor and whether said fuse is cut or not;
- a fuse cutting transistor coupled in series with said fuse between said first and second power supply lines;
- a switch coupled to said fuse cutting transistor and selectively coupled to one of said fuse and said another fuse;
- and
- an additional transistor coupled to a node between said another fuse and said switch.
8 more elements
Dependencies are inferred from the claim text.