Reprogrammable Electronic Fuse Structure for Stable Multi-Write Reads
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Solution Overview
Problem
One-time programmable read-only memory (OTP ROM) technologies are limited by their inability to support multiple write operations, restricting their applications in high-density, reliable, and affordable information storage solutions for reconfigurable ROM, root-of-trust implementations, and on-chip security keys.
Innovation Solution
Development of electronic fuses that can withstand multiple write operations by changing conductivity through high voltage application, allowing the fuses to be read accurately even after several write cycles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If one-time programmable fuse elements are used for information storage, then reliability and security are improved, but the ability to perform multiple write operations is lost
Solution Approach 1:
The fuse element transitions from a static one-time programmable state to a dynamic multi-time programmable state. The conductive bridge structure allows the fuse to be reconfigured multiple times by controlling the formation and dissolution of conductive paths through the insulating layer, enabling repeated write operations while maintaining reliable state storage.
Solution Approach 2:
The invention changes the physical parameters of the fuse structure by introducing a thin insulating layer that can be selectively breached. By controlling the thickness and material properties of this insulating layer, the fuse can transition between conductive and non-conductive states multiple times, allowing repeated programming operations while maintaining stable state retention.
2Ease of operation
If high voltage is applied to change fuse conductivity, then write operation is achieved, but fuse reliability may deteriorate after multiple cycles
Solution Approach 1:
The thin insulating layer acts as a cushioning element that protects the conductive bridge from permanent damage during repeated high voltage write operations. This insulating layer allows the conductive path to be formed and broken controllably multiple times without causing catastrophic failure, thereby maintaining fuse reliability across many write cycles.
Solution Approach 2:
The insulating layer serves as an intermediary between the electrodes and the conductive bridge material. It mediates the interaction during write operations by allowing controlled breaching and recovery, enabling high voltage application for writing while protecting the overall fuse structure from degradation and maintaining state stability.
3Adaptability or versatility
If multiple write operations are enabled on fuses, then adaptability is improved, but manufacturing complexity increases
Solution Approach 1:
The fuse structure is segmented into distinct functional layers: conductive bridge material, thin insulating layer, and electrodes. This segmentation allows each layer to perform its specific function independently, enabling multi-time programming capability while keeping the overall manufacturing process manageable through standardized layer deposition techniques.
Solution Approach 2:
The invention uses composite material structure combining conductive bridge material with a thin insulating layer. This composite approach enables the multi-time programmable functionality by integrating materials with complementary properties, where the insulating layer provides the necessary control mechanism without significantly increasing manufacturing complexity.
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
Enables reliable and cost-effective multiple write operations on electronic fuses, maintaining accurate read states across various temperatures and environments, meeting JEDEC specifications.
Implementation Method 1
The state of the electronic fuse can be changed by blowing the fuse, which changes the conductivity to a low conductivity. For example, a fuse may be blown by applying a high voltage across the small strip of material.
Data Source
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AI summary
Technologies for multiple-time reprogrammable fuses are disclosed. In an illustrative embodiment, an electronic fuse in an integrated circuit component may be written a first time, blowing the fuse. The fuse may then be read many times during normal operation. At a later time, the fuse may have a write operation performed on it again. The write operation does not further disturb the state of the fuse, allowing for the fuse to continue to be read without error, even after several write cycles.