Semiconductor Fuse Write Controller with Dynamic Turn-On Adjustment
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Solution Overview
Problem
The existing semiconductor devices using electrical fuses for storage face instability in write operations due to variable turn-on periods of the write driver, leading to inconsistent blowing results and potential reconnection of the fuse, resulting in leakage and erroneous determinations, which affects the initial yield and reliability of the semiconductor device.
Innovation Solution
A semiconductor device with a storage element write unit that includes a write controller with a signal level detection circuit and a delay circuit, where the write operation is stopped after a predetermined time from detection of the blown state, ensuring a stable blown state and reducing the likelihood of undershoot errors, thereby enhancing yield and reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the turn-on period of the write driver is fixed, then the write operation is simplified, but some fuses cannot be sufficiently blown or exhibit reconnection leading to leakage
Solution Approach 1:
The write driver controller dynamically adjusts the turn-on period of the write driver based on detection signals from the storage element. The controller extends the turn-on period when the fuse shows signs of reconnection or insufficient blowing, and reduces it when blowing is sufficient. This dynamic adjustment resolves the contradiction by maintaining operational simplicity while ensuring reliable fuse blowing across varying conditions.
Solution Approach 2:
The system implements feedback by continuously monitoring the voltage level at the node connecting the fuse and write driver. The write driver controller receives detection signals based on this voltage level and adjusts the write driver's turn-on period accordingly. This feedback mechanism ensures that the fuse is blown sufficiently without causing reconnection or leakage, while maintaining simple operation.
2Reliability
If the write driver turn-on period is extended to ensure fuse blowing, then blowing completeness improves, but the metal material may move to reconnect the fuse causing leakage
Solution Approach 1:
The system uses feedback from voltage detection at the fuse-node to control the write driver's turn-on period. When the voltage indicates sufficient blowing, the controller reduces the turn-on period to prevent metal material movement and reconnection. When blowing is insufficient, the controller extends the turn-on period. This feedback-based control resolves the contradiction between blowing completeness and preventing leakage.
Solution Approach 2:
The write driver controller changes the turn-on period parameter dynamically based on the detected state of the fuse. By adjusting this temporal parameter in response to voltage level detection, the system achieves complete blowing when needed while preventing reconnection and leakage through timely termination of the write driver operation.
3Reliability
If the write operation continues after fuse blowing detection, then the blown state is stabilized, but erroneous determination of unblown state occurs due to reconnection
Solution Approach 1:
The write driver controller performs preliminary action by extending the turn-on period beyond the initial blowing detection point. This ensures that the fuse is fully blown and stabilized before the controller stops the write driver. The preliminary extension prevents premature termination that would cause erroneous unblown state determination, while the subsequent monitoring prevents reconnection.
Solution Approach 2:
The system uses feedback from continuous voltage monitoring to determine when the fuse is sufficiently blown and stable. The controller adjusts the turn-on period based on this feedback, ensuring both stable blown state and accurate detection. The feedback mechanism prevents erroneous determination by confirming complete blowing before termination.
4Object-generated harmful factors
If the turn-on period is reduced to prevent reconnection, then leakage is prevented, but some fuses are not sufficiently blown
Solution Approach 1:
The write driver controller uses feedback from voltage level detection to dynamically adjust the turn-on period. When voltage indicates insufficient blowing, the controller extends the turn-on period to ensure sufficient blowing. When voltage indicates complete blowing, the controller reduces the turn-on period to prevent reconnection. This feedback-based dynamic adjustment resolves the contradiction between preventing reconnection and ensuring sufficient blowing.
Solution Approach 2:
The system dynamically adjusts the turn-on period parameter based on real-time detection of fuse blowing state. The controller extends the period when blowing is insufficient and reduces it when blowing is complete, preventing reconnection. This dynamic adaptation ensures both sufficient blowing and reconnection prevention across varying fuse characteristics and conditions.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a stable write state with high yield and reliability by stopping the write operation after a predetermined time from detection, preventing reconnection and undershoot errors, and ensuring correct determination of the blown state, even under varying temperature and voltage conditions.
Implementation Method 1
The electrical fuse is blown by causing a large current to flow in the fuse
Implementation Method 2
a signal level detection circuit, the first node signal being input to the signal level detection circuit
Data Source
AI summary
A semiconductor device includes a storage element write unit including a storage element configured to be electrically written only once and store two values, a write controller connected to the storage element through a first node signal and configured to perform a write to the storage element based on a write control signal instructing a write to the storage element, and a write state detection circuit configured to detect that the storage element is in a write state based on a measurement signal obtained by measuring the first node signal. In a case where the write controller receives a detection signal indicating that the storage element is in the write state from the write state detection circuit after start of a write to the storage element, the write controller stops write operation after a lapse of a predetermined time from detection of the write state of the storage element.