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US 7,459,957 B2Granted
Fuse circuit with leakage path elimination
AssigneeSamsung Electronics Co., Ltd.
InventorsMin-Soo Kim, Kyu-Han Han
Life of this patent
Estimating the term…
Abstract
A fuse circuit may include a fuse cut detection unit to output state information indicating whether or not a fuse is cut during a fuse cut detection time period, a maintenance and output unit to maintain the state information and output a fuse state information signal, and a connection/disconnection unit to connect the fuse cut detection unit to the maintenance and output unit during the fuse cut detection time period and disconnect the fuse cut detection unit from the maintenance and output unit after the fuse cut detection time period. A fuse circuit may recognize an indefinite voltage at a detection node caused by a leakage path through a fuse as a predetermined fuse state.
Claims23
A fuse circuit comprising:
- a fuse cut detection unit to output state information indicating whether or not a fuse is cut during a fuse cut detection time period;
- a maintenance and output unit to maintain the state information and output a fuse state information signal;
- and
- a connection/disconnection unit to connect the fuse cut detection unit to the maintenance and output unit during the fuse cut detection time period and disconnect the fuse cut detection unit from the maintenance and output unit after the fuse cut detection time period;
- wherein the fuse cut detection unit comprises:
- a first device to couple a detection node to a first power supply, and
- a second device to couple the detection node to a second power supply through the fuse;
- and
- wherein the first and second devices are both on at the same time during the fuse cut detection time period.
6 more elements
A fuse circuit comprising:
- a fuse cut detection unit to output state information indicating whether or not a fuse is cut during a fuse cut detection time period;
- a maintenance and output unit to maintain the state information and output a fuse state information signal;
- and
- a connection/disconnection unit to connect the fuse cut detection unit to the maintenance and output unit during the fuse cut detection time period and disconnect the fuse cut detection unit from the maintenance and output unit after the fuse cut detection time period;
- wherein the fuse cut detection unit comprises:
- the fuse having a first terminal connected to a first power supply;
- a delay circuit to delay a first control signal by the fuse cut detection time period and output a second control signal as a result of the delay;
- and
- a state information output unit to output the state information in response to the first control signal and the second control signal;
- and
- wherein the state information output unit comprises:
- a first MOS transistor connected between a second terminal of the fuse and a node from which the state information is output, and having a gate to which the first control signal is applied;
- and
- a second MOS transistor connected between the node from which the state information is output and a second power supply, and having a gate to which the second control signal is applied.
11 more elements
A fuse circuit comprising:
- a fuse cut detection unit to output state information indicating whether or not a fuse is cut during a fuse cut detection time period;
- a maintenance and output unit to maintain the state information and output a fuse state information signal;
- and
- a connection/disconnection unit to connect the fuse cut detection unit to the maintenance and output unit during the fuse cut detection time period and disconnect the fuse cut detection unit from the maintenance and output unit after the fuse cut detection time period;
- wherein the fuse cut detection unit comprises:
- a delay circuit to delay a first control signal by the fuse cut detection time period and output a second control signal as a result of the delay;
- and
- a state information output unit including the fuse, and configured to output the state information in response to the first control signal and the second control signal;
- wherein the state information output unit comprises:
- the fuse;
- a first MOS transistor connected between a first power supply and a first terminal of the fuse, and having a gate to which the first control signal is applied;
- and
- a second MOS transistor connected between a second terminal of the fuse and a second power supply, and having a gate to which the second control signal is applied;
- and
- wherein the state information is output from a connection node between the second terminal of the fuse and the second MOS transistor.
12 more elements
A fuse circuit comprising:
- a delay circuit to delay a first control signal by a predetermined time period and output a second control signal as a result of the delay;
- a state information output unit to output state information indicating whether or not a fuse is cut in response to the first control signal and the second control signal;
- a maintenance and output unit to maintain the state information and output a fuse state information signal;
- and
- a connection/disconnection unit to disconnect the state information output unit from the maintenance and output unit in response to the second control signal;
- wherein the state information output unit comprises:
- a first device to couple a detection node to a first power supply, and
- a second device to couple the detection node to a second power supply through the fuse;
- and
- wherein the first and second devices are both on at the same time during the predetermined time period.
7 more elements
A method of sensing the state of a fuse, the method comprising:
- connecting a detection node to a first power supply through a first device;
- connecting the detection node to a second power supply through the fuse and a second device;
- detecting a voltage of the detection node;
- and
- always recognizing the voltage of the detection node as a predetermined fuse state when the voltage of the detection node is between voltages of the first and second power supply;
- wherein the first and second devices are both on at the same time during a fuse cut detection time period.
3 more elements
Dependencies are inferred from the claim text.