Chip Package ESD Protection via Extended Ground Interconnects
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Solution Overview
Problem
Conventional chip packaging schemes face challenges in effectively protecting against electrostatic discharge (ESD) due to inadequate routing that often leaves I/O interconnects vulnerable to ESD events, leading to potential damage to charge-sensitive circuitry.
Innovation Solution
The implementation of a chip package design that directs ESD risk through ground and power interconnects preferentially over I/O interconnects, with enhanced ESD protection circuitry connected to ground and power interconnects, and automated test equipment configured to ground devices before contacting I/O interconnects, thereby reducing the risk of ESD exposure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional ESD routing with dual diodes and power clamps is used, then ESD protection circuitry is provided, but I/O interconnects remain vulnerable to ESD events
Solution Approach 1:
The patent extends ground and power interconnects beyond the substrate edges before I/O interconnects are exposed, creating a preferential ESD path in advance. This preliminary positioning of robust interconnects ensures that ESD events are intercepted and directed through ground/power paths before they can reach vulnerable I/O interconnects.
Solution Approach 2:
The patent converts the potential harm of ESD events into a beneficial protection mechanism by designing the interconnect layout so that ESD naturally follows the path of least resistance through extended ground and power interconnects. The harmful ESD energy is redirected through robust interconnects that can handle the discharge, protecting the vulnerable I/O circuitry.
2Reliability
If ground and power interconnects are extended farther than I/O interconnects, then ESD events are directed through robust interconnects, but interconnect height variations increase
Solution Approach 1:
The patent applies different heights to different interconnects based on their specific function and location. Ground and power interconnects that need to extend farther and provide ESD protection are made taller, while I/O interconnects maintain standard heights. This localized differentiation optimizes ESD protection where needed without unnecessarily complicating the entire interconnect structure.
Solution Approach 2:
The patent resolves the height uniformity issue by utilizing the vertical dimension selectively. Instead of varying heights across all interconnects, only specific ground and power interconnects are extended in the vertical dimension at strategic locations near substrate edges, while maintaining overall structural consistency. This targeted dimensional variation achieves ESD protection without excessive manufacturing complexity.
Data Source
AI summary
Techniques for electrostatic discharge (ESD) protection in integrated circuit (IC) chip packages methods for testing the same are described that are configured to directs the risk of ESD events through ground and power interconnects preferentially over I/O interconnects to enhance ESD protection in chip packages. In one example, a chip package is provided that includes an IC die, a substrate, and a plurality of interconnects. The plurality of interconnects are exposed on a side of the substrate opposite the IC die. The interconnects provide terminations for substrate circuitry formed within the substrate. At least one of the last 5 interconnects of the plurality of interconnects respectively comprising rows and columns of interconnects disposed along the edges of the substrate that closest to each corner of substrate project farther from the substrate than interconnects within those rows and columns that are configured as I/O interconnects.