The NCT3958Y-T is a reset IC manufactured by Nuvoton Technology Corporation of America. It is a voltage detector or supervisor that monitors the supply voltage of a system and generates a reset signal when the voltage falls below a certain threshold. This reset signal can be used to safely shut down or restart the system, preventing data corruption or other malfunctions.

Applications

• Microcontroller-based systems: Used to monitor the supply voltage of microcontrollers and generate a reset signal when the voltage falls below the operating range.
• FPGA-based systems: Integrated into FPGA-based systems to ensure proper startup and operation.
• Power management circuits: Employed in power management circuits to provide undervoltage protection.
• Industrial control systems: Used in industrial control systems to prevent system failures due to voltage fluctuations.
• Automotive electronics: Utilized in automotive electronic systems to ensure reliable operation in harsh environments.

Features

• Supply voltage monitoring: Monitors the supply voltage and generates a reset signal when the voltage falls below the threshold.
• Adjustable reset threshold: The reset threshold voltage can be adjusted to suit different system requirements.
• Active-low reset output: The reset output is active low, meaning it is low when the voltage is below the threshold and high when the voltage is above the threshold.
• Small package: Available in a small surface-mount package for easy integration into PCB layouts.
• Low power consumption: Designed for low power consumption, making it suitable for battery-powered devices.
• RoHS compliant: Meets RoHS environmental standards, ensuring compliance with regulations regarding hazardous substances.

Benefits

• Undervoltage protection: Prevents system malfunctions due to undervoltage conditions.
• Data protection: Protects data from corruption during power failures.
• System stability: Ensures system stability by providing a clean reset signal.
• Simplified design: The small package simplifies PCB layout and assembly.
• Low power consumption: Extends battery life in portable devices.
• Reliable performance: Provides reliable voltage monitoring and reset functionality.

Additional Details

The NCT3958Y-T reset IC operates by continuously monitoring the supply voltage. When the voltage falls below the set threshold, an internal comparator triggers the reset output to go low. The reset output remains low until the supply voltage rises above the threshold plus a hysteresis voltage. This hysteresis prevents the reset signal from oscillating when the supply voltage is near the threshold. The device typically has a built-in delay to prevent spurious resets due to transient voltage dips. Key specifications include the reset threshold voltage, hysteresis voltage, reset delay time, and supply voltage range. Proper selection of the reset threshold voltage is critical to ensure that the system is reset before it can malfunction due to undervoltage conditions.