Staggered Bond Pads and I/O Cells for High Density IC Design
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Solution Overview
Problem
Integrated circuit packages face challenges in reducing die size while maintaining high I/O counts due to fine pitch I/O cell configurations, leading to increased costs and reduced wafer yield, as existing solutions have not effectively addressed the need for smaller die sizes without compromising packaging processes.
Innovation Solution
The integrated circuit package system incorporates I/O cells with recesses and bond pads of varying widths, allowing for horizontal overlap between adjacent bond pads, which reduces die size and increases I/O density without increasing packaging complexity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If fine pitch I/O cell configurations are used to maintain high I/O counts, then I/O density is improved, but die size reduction is hindered and packaging complexity increases
Solution Approach 1:
The patent applies asymmetry by offsetting alternating I/O cells from their regular grid positions, creating a staggered pattern where cells are shifted horizontally by a predetermined amount. This asymmetric arrangement increases the vertical spacing between adjacent bond pads while maintaining the same die area, thereby accommodating higher I/O counts without proportionally increasing die size.
Solution Approach 2:
The patent transitions from a two-dimensional grid layout to a three-dimensional staggered configuration by offsetting cells in the horizontal direction. This dimensional change allows bond pads to be arranged with greater vertical separation, improving packaging accessibility and reducing complexity while maintaining high I/O density within the same die footprint.
2Quantity of substance
If fine pitch I/O cell configurations are used, then I/O density is improved, but packaging complexity and cost increase
Solution Approach 1:
By offsetting alternating I/O cells horizontally, the patent creates asymmetric spacing that increases vertical distance between adjacent bond pads. This staggered arrangement simplifies packaging operations by providing greater access space for wire bonding tools, reducing the complexity of routing wires between closely spaced pads, and lowering overall packaging cost despite maintaining high I/O counts.
3Ease of manufacture
If traditional I/O cell arrangements are used, then manufacturing is simpler, but wire crossings increase and bonding efficiency decreases
Solution Approach 1:
The staggered offset arrangement of alternating I/O cells reduces wire crossings by providing more vertical space for wire routing between adjacent bond pads. This asymmetric configuration allows wire bonding tools to access pads more efficiently with fewer wire overlaps and tangles, thereby improving bonding productivity while maintaining manufacturing feasibility through a systematic cell offset pattern.
Data Source
AI summary
Staggered bond ads and I/O cells are arranged on an integrated circuit. The integrated circuit includes at least a first I/O cell having a first bond pad and first opposing set of recesses, a second I/O cell having a second bond sad and second opposing set of recesses, and a third I/O cell having a third bond sad and third opposing set of recesses. Each set of opposing recesses can be arranged in a staggered formation to receive adjacent bond pads, which can also be configured in a staggered formation.