Semiconductor Pad Self-Testing via Enable Controller
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Solution Overview
Problem
Current semiconductor device testing methods require a test pad for open/short (OS) tests, which can be inconvenient and increase production costs, especially in multi-chip packages where minimizing the number of pads is essential for cost reduction and efficient packaging.
Innovation Solution
A semiconductor device with an enable controller that generates an enable signal for testing pad connectivity based on a boot-up enable signal, including an input circuit to buffer command addresses and generate input signals, and an output circuit to selectively output signals to an outside device, allowing for self-testing without a dedicated test pad.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a dedicated test pad is used for open/short testing, then testing accuracy is improved, but device complexity and production cost increase
Solution Approach 1:
The pad serves dual purposes: it functions as a normal I/O pad for signal transmission during device operation, and simultaneously serves as a test pad for open/short testing during manufacturing. The enable controller selectively activates testing mode through control signals, allowing the same pad structure to fulfill both functional and testing roles without requiring separate dedicated test pads.
Solution Approach 2:
The invention merges the testing function with the existing I/O pad structure by integrating an enable controller that can switch the pad between normal operation mode and testing mode. This consolidation eliminates the need for separate dedicated test pads, reducing device complexity while maintaining testing capability through the shared pad infrastructure.
2Reliability
If additional test pads are added for open/short testing, then testing capability is improved, but manufacturing cost increases
Solution Approach 1:
The pad structure is designed to perform multiple functions: normal I/O operations and open/short testing. By making the pad universal, the invention eliminates the need for additional dedicated test pads, thereby reducing manufacturing costs while preserving complete testing capability through the enable controller's mode switching functionality.
Solution Approach 2:
The semiconductor device performs self-testing through its own internal enable controller that activates testing mode using existing pad infrastructure. This self-service capability eliminates the need for external dedicated test pads or additional manufacturing steps, reducing production costs while maintaining reliable open/short testing functionality.
3Reliability
If dedicated test pads are used, then testing reliability is improved, but the number of pads increases
Solution Approach 1:
The invention makes existing I/O pads universal by enabling them to serve both as functional signal pads and as test pads through the enable controller's mode switching. This approach maintains testing reliability while avoiding the increase in pad quantity that would result from adding dedicated test pads.
Solution Approach 2:
The testing function is merged with the existing I/O pad structure through the enable controller, allowing the same physical pads to fulfill both operational and testing roles. This consolidation maintains testing reliability without increasing the total number of pads required in the device.
Data Source
AI summary
A semiconductor device, a test method, and a system including the same are disclosed, which may relate to a technology for testing open and short states of a pad of a semiconductor device.