eFuse OTP Memory Cell With Shared Transistors for Smaller Arrays

The patent implements a transistor sharing mechanism where transistors serve multiple functions across different eFuse cells. Specifically, transistors are shared between adjacent eFuse cells to perform both programming and reading operations, thereby reducing the total number of transistors required while maintaining full functionality. This multi-functionality approach directly resolves the contradiction by preserving reliability through functional completeness while reducing area through resource sharing.

The patent merges the transistor requirements of adjacent eFuse cells by implementing a shared transistor architecture. Instead of each eFuse cell having dedicated transistors for all operations, the design combines and shares transistor resources between cells, particularly for programming operations. This merging strategy reduces the overall transistor count and consequently the memory device area while maintaining the necessary functionality through coordinated operation of shared transistors.

The patent employs a universal transistor sharing approach where transistors are designed to perform multiple operations (programming and reading) across different eFuse cells. This multi-functionality allows the same transistor to be utilized for different purposes depending on the operational mode and cell selection, thereby maintaining ease of operation while significantly reducing the cell array area compared to dedicated transistor configurations.

The patent implements dynamic control of shared transistors through timing sequences and control signals that enable transistors to switch between different operational states. The transistor sharing is dynamically managed based on whether programming or reading operations are currently active, allowing flexible and efficient use of shared resources. This dynamic approach ensures that operations can be performed correctly while minimizing the physical space required for the cell array.