The XC9801B333KRN is a high-performance voltage detector manufactured by Torex Semiconductor Ltd. It's designed to accurately monitor voltage levels in electronic circuits and provide a reliable reset signal when the voltage drops below a predefined threshold. This ensures that systems operate safely and predictably, preventing data corruption or erratic behavior.

Applications

• Microcontroller Reset Circuits: Provides a reliable reset signal for microcontrollers during power-up or brown-out conditions.
• Battery Monitoring: Monitors battery voltage in portable devices to prevent deep discharge.
• Power Supply Monitoring: Ensures that power supplies are operating within acceptable voltage limits.
• Memory Protection: Protects memory contents from corruption during voltage drops.
• Real-Time Clock (RTC) Backup: Monitors power for RTC backup systems, ensuring data retention.

Features

• High Accuracy: Provides precise voltage detection with a typical accuracy of ±1%.
• Low Current Consumption: Minimizes power drain, making it suitable for battery-powered applications.
• Small Package: Available in compact packages, such as SOT-25, for space-constrained designs.
• Wide Operating Voltage Range: Supports a broad range of input voltages.
• Adjustable Delay Time: Offers options for adjusting the reset delay time.
• Built-in Hysteresis: Improves noise immunity and prevents oscillation around the threshold voltage.
• Open Drain Output: Provides flexible interface options with other circuits.
• Detection Voltage: 3.3V (Indicated by '33' in the part number)

Benefits

• Ensures System Stability: Prevents system malfunctions due to voltage fluctuations.
• Protects Data Integrity: Prevents data corruption in memory and other storage devices.
• Extends Battery Life: Low current consumption minimizes power drain in portable devices.
• Simplifies Circuit Design: Integrates voltage monitoring and reset functionality into a single component.
• Increases System Reliability: Robust design ensures stable operation in harsh environments.
• Cost-Effective Solution: Provides a reliable voltage detection solution at a competitive price.

Additional Details

The XC9801B333KRN operates by continuously monitoring the input voltage. When the voltage drops below the detection threshold (3.3V in this case), the device asserts a reset signal. The reset signal remains asserted until the input voltage rises above the threshold plus the hysteresis voltage. This hysteresis prevents the output from oscillating due to noise or minor voltage variations. The open-drain output allows for flexible connection to other circuits, enabling the implementation of various system reset schemes. The 'KRN' suffix likely indicates the package type (e.g., SOT-25) and specific tape and reel packaging details. The Torex XC9801 series is a popular choice for system designers seeking a reliable and efficient voltage detection solution for a wide range of applications. The small package size and low power consumption make it particularly well-suited for portable and battery-powered devices.