Power-On Reset Latch Circuit for Fuse Leakage Immunity
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Solution Overview
Problem
Existing redundancy switch control circuits in integrated circuit systems are prone to failure due to leakage current issues when fuses are blown, especially under slow power-on ramp rates, leading to incorrect operation.
Innovation Solution
A power-on reset circuit with a detector and latch circuit, along with a single fuse redundancy switch circuit, is introduced to provide improved resistance against parasitic leakage currents, ensuring correct operation even under fast-cycling power supply conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional switch control circuits with two fuses are used, then the circuit can be programmed through fuse blowing, but leakage current through blown fuses causes incorrect operation especially under slow power-on ramp rates
Solution Approach 1:
The patent divides the power-on reset function into two separate circuits: a detector circuit that monitors voltage threshold and a latch circuit that generates the reset signal. This segmentation allows the detector to quickly respond to voltage changes while the latch maintains the reset state, preventing leakage current from causing incorrect operation during slow power-on ramps.
Solution Approach 2:
The detector circuit is designed to detect when the power voltage reaches the threshold level before the main circuit operates. This preliminary detection ensures that the power-on reset signal is generated in advance, preventing leakage current effects from interfering with circuit initialization during slow power-on conditions.
2Stability of the object's composition
If power-on ramp rate is slow, then power supply stability is improved, but leakage current has more time to drain charge causing incorrect operation
Solution Approach 1:
The latch circuit provides feedback to maintain the power-on reset signal state. Once the detector circuit detects that the voltage threshold is reached, the latch circuit latches this state and maintains the reset signal, preventing charge loss due to leakage current from affecting circuit operation during slow power-on ramps.
3Productivity
If device dimensions are shrunk to increase integration, then manufacturing density is improved, but leakage current increases causing switch failure
Solution Approach 1:
The patent extracts the power-on reset function from the main switch control circuit and implements it through separate detector and latch circuits. This extraction isolates the critical reset function from leakage current effects, allowing device dimensions to be shrunk for higher integration while maintaining reliable switch operation through the dedicated reset mechanism.
Data Source
AI summary
A system for initializing circuitry is presented. The system employs a power-on reset circuit having a threshold voltage and a programmable switch circuit. The power-on reset circuit has a detector circuit for detecting a reference voltage, and a one-sided latch for generating an output voltage reflective of the reference voltage. The detector circuit has a threshold after which the one-sided latch is activated. The programmable switch circuit receives the output voltage of the power-on reset circuit and generates an enable signal and its complement based on the status of an internal fuse. The switch point of the power-on reset circuit provides for a rapid increase in output voltage that offsets parasitic leakage current in the programmable switch circuit that can result in improper enable signal output. A high resistance direct path to ground on an output node of the power-on reset circuit prevents residual charge from causing an undesired misfire.