Lock-out Circuit Selective Voltage Protection
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Solution Overview
Problem
Conventional lock-out circuits in semiconductor memory devices disconnect operating voltage when it falls below a predetermined level, even if the low voltage is sufficient for ongoing operations, leading to premature termination of functions.
Innovation Solution
A lock-out circuit that selectively disables the lock-out function based on the operating mode of the integrated circuit device, allowing the voltage to remain connected for operations requiring lower voltages and disconnecting it only when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the lock-out circuit disconnects operating voltage when it falls below a predetermined level, then the device is protected from operating at insufficient voltage, but operations requiring low voltage are prematurely terminated
Solution Approach 1:
The lock-out circuit dynamically adjusts its threshold based on operating mode. In normal mode, it uses a predetermined voltage threshold to disconnect power when voltage falls below the level. In low-voltage operating mode, it lowers the threshold or disables the lock-out function, allowing continuous operation at reduced voltages. This dynamic adaptation resolves the contradiction by making the protection mechanism flexible rather than fixed.
Solution Approach 2:
The invention changes the voltage threshold parameter based on the operating mode of the device. When the device enters low-voltage operating mode, the lock-out circuit modifies its detection threshold from the predetermined level to a lower level, or disables the lock-out function entirely. This parameter change allows the system to maintain both protection reliability and operation continuity by adapting the protection criteria to current operational requirements.
2Reliability
If the lock-out function is always active, then voltage protection is ensured, but low-voltage operations are interrupted
Solution Approach 1:
The lock-out function transitions from a static always-active state to a dynamic state that adjusts based on operating mode. The circuit continuously monitors the operating mode and selectively activates or deactivates the lock-out function accordingly. This dynamic behavior ensures voltage protection when needed while maintaining operational smoothness when low-voltage mode is intentional.
Solution Approach 2:
The lock-out circuit automatically detects the operating mode and self-adjusts its activation state without external intervention. When the device operates in low-voltage mode, the lock-out circuit autonomously disables itself to prevent premature termination of operations. This self-service capability resolves the contradiction by making the protection mechanism intelligent and context-aware.
Data Source
AI summary
A lock-out circuit is adapted to selectively perform a lock-out function in an integrated circuit device. The lock-out function cuts off the supply of an operating voltage to the integrated circuit device whenever a power supply voltage for the device falls below a predetermined detection voltage. However, the lock-out function is disabled whenever the integrated circuit device performs an operation requiring a power supply voltage lower than the predetermined detection voltage.