Memory Device Temperature-Based Timing Parameter Switching
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Solution Overview
Problem
Semiconductor memory devices face reduced yield due to timing parameter violations during low-temperature testing, as timing parameters such as write recovery time (tWR) become longer, leading to insufficient data write times and potential failure during testing.
Innovation Solution
Implementing a method where the memory device switches between first and second timing parameters based on temperature, using a temperature sensor to detect changes and adjust write recovery timing requirements from a standard 15 ns to a more relaxed 30 ns when temperatures drop below a reference point, thereby avoiding timing failures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a standard timing requirement specification is applied at low temperature, then timing parameter compliance is maintained, but write recovery time becomes insufficient leading to timing failures
Solution Approach 1:
The patent applies dynamics by making the timing parameter specification changeable based on temperature conditions. The memory device dynamically switches between first timing parameters (at high temperature) and second timing parameters (at low temperature), allowing the system to adapt to varying thermal environments and avoid timing failures during low-temperature operation.
Solution Approach 2:
The patent implements parameter changes by modifying the timing requirement specifications based on detected temperature. When temperature drops below a reference point, the system transitions from a first timing parameter specification to a second timing parameter specification with relaxed requirements, directly addressing the insufficient write recovery time at low temperatures.
2Reliability
If timing parameters are relaxed to accommodate low temperature operation, then timing failures are reduced, but manufacturing yield must be improved through systematic management
Solution Approach 1:
The patent employs feedback through a temperature sensor that continuously monitors the memory device temperature and provides information to the control logic. This feedback mechanism enables the system to automatically adjust timing parameters based on actual thermal conditions, ensuring reliable operation across temperature ranges while maintaining manufacturing yield through systematic temperature-based management.
Solution Approach 2:
The memory device performs self-service by autonomously adjusting its own timing parameters based on temperature detection. The device includes temperature sensor means, parameter determination means, and control means that work together to automatically select appropriate timing specifications without external intervention, improving both reliability and manufacturability.
3Productivity
If temperature-based timing parameter switching is implemented, then yield is improved, but device complexity increases due to additional temperature sensor and control logic
Solution Approach 1:
The patent achieves universality by designing a multi-functional integrated system where the temperature sensor serves both temperature monitoring and timing parameter selection functions. The control logic simultaneously manages temperature-based parameter switching and ensures compliance with timing requirements, reducing the need for separate dedicated components and minimizing overall device complexity.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach increases the yield of semiconductor memory devices by ensuring adequate write recovery times at lower temperatures, reducing the number of timing failures and improving overall device performance.
Implementation Method 1
a temperature sensor configured to detect the temperature of the memory device
Data Source
AI summary
A memory device used with a relaxed timing requirement specification according to temperatures, an operation method thereof, and a memory controller and a memory system using the memory device are provided. The memory device has a first timing characteristic at a first temperature and a second timing characteristic that is longer than the first timing characteristic at a second temperature. If a temperature of the memory device is higher than a reference temperature, the memory controller controls the first timing characteristic as a timing requirement specification of the memory device. If the temperature of the memory device is lower than the reference temperature, the memory controller controls the second timing characteristic as the timing requirement specification of the memory device.