Strapping Contacts Zigzag Layout for Semiconductor Memory
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Solution Overview
Problem
As integration density increases in semiconductor memory devices, the resistance of word lines increases, leading to voltage delays and a higher likelihood of bridge formation between strapping contacts due to reduced contact pitch, which affects the performance and reliability of the memory device.
Innovation Solution
The semiconductor memory device incorporates strapping contacts arranged in a zigzag form within the strapping regions, with increased pitch to prevent bridge formation, where the contacts are positioned on every other active pattern and bit line, enhancing the contact margin and reducing the risk of electrical shorts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the pitch of strapping contacts is reduced to increase integration density, then the integration density is improved, but the likelihood of bridge formation between adjacent strapping contacts increases
Solution Approach 1:
The strapping contacts are arranged in a zigzag pattern rather than a straight linear arrangement. This asymmetric configuration increases the effective pitch between adjacent contacts while maintaining the same footprint area, thereby reducing bridge formation risk without sacrificing integration density
Solution Approach 2:
The strapping contacts transition from a one-dimensional linear arrangement to a two-dimensional zigzag pattern. By utilizing the additional spatial dimension, the design achieves greater separation between contacts while maintaining compact layout, effectively resolving the contradiction between density and reliability
2Quantity of substance
If the word line length is increased to accommodate higher integration density, then the integration density is improved, but the resistance of the word line increases causing voltage delay
Solution Approach 1:
The word line is divided into multiple segments by inserting strapping contacts at intermediate points. Each segment has shorter length and lower resistance, and the strapping contacts provide alternative current paths that reduce the overall voltage delay while maintaining high integration density
Data Source
AI summary
Semiconductor memory devices having strapping contacts are provided, the devices include cell regions and strapping regions between adjacent cell regions in a first direction. Active patterns, extending in the first direction throughout the cell regions and strapping regions, are spaced apart from one another in a second direction intersecting the first direction. First interconnection lines, extending in the first direction throughout the cell regions and strapping regions, are spaced apart from one another in the second direction while overlapping with the active patterns. Second interconnection lines, extending in the second direction, intersect the active patterns and first interconnection lines in the cell regions. The second interconnection lines are spaced apart from one another in the first direction. Memory cells are positioned at intersection portions of the first and second interconnection lines in the cell regions. The active patterns contact the first interconnection lines through strapping contacts in the strapping regions.