The PST8231NR is a voltage detector IC manufactured by Mitsumi Electric. It is designed to monitor voltage levels and provide a reset signal when the voltage falls below a specified threshold.

Applications:

• Microcontroller reset circuits
• CPU reset circuits
• Power supply monitoring
• Battery-powered devices
• Over-voltage and under-voltage protection

Features:

• Detection Voltage: 2.3V
• Reset Output: N-channel open drain
• Operating Voltage: 1.5V to 5.5V
• Low Current Consumption: Typically 1.5 µA
• Reset Delay Time: Typically 200 ms
• Package: SOT-23
• High accuracy voltage detection
• Built-in hysteresis

Benefits:

• Reliable Reset Function: Provides a reliable reset signal to microcontrollers and CPUs during power-up and brownout conditions.
• Low Power Consumption: Minimizes current drain, extending battery life in portable devices.
• Small Package: The SOT-23 package allows for compact circuit designs.
• Wide Operating Voltage Range: Suitable for a wide range of applications with different voltage requirements.
• Built-in Hysteresis: Prevents oscillations and ensures stable operation.

Additional Details:

The PST8231NR voltage detector monitors the input voltage and asserts a reset signal when the voltage drops below the detection threshold. The reset signal is maintained until the voltage rises above the threshold plus the hysteresis voltage. This prevents false resets due to noise or minor voltage fluctuations. The open-drain output allows for flexible interfacing with different logic levels. The IC is designed for low voltage applications, and its low current consumption makes it ideal for battery-powered devices. The small SOT-23 package allows for efficient use of board space.