The RH5RE47AA is a voltage detector IC manufactured by Ricoh. It's designed to accurately monitor voltage levels and provide a reset signal when the voltage drops below a pre-set threshold. It is commonly used for power management and system protection in various electronic devices.

Applications

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

Features

• High-accuracy voltage detection
• Low supply current
• Small package size
• Fixed detection voltage (4.7V in this case)
• Built-in hysteresis
• Open drain output
• Operating temperature: -40°C to +85°C

Benefits

• Provides reliable system reset in case of voltage drops, preventing erratic behavior.
• Extends battery life in portable devices due to low current consumption.
• Simplifies circuit design with a small package size.
• Offers precise voltage monitoring.
• Prevents oscillations during voltage transitions with built-in hysteresis.
• Easy interface with microcontrollers and other digital circuits with open drain output.

Additional Details

The RH5RE47AA monitors the input voltage and asserts a reset signal when the voltage falls below the detection threshold of 4.7V. The open-drain output requires a pull-up resistor. The hysteresis feature prevents the device from rapidly switching on and off when the input voltage is near the threshold. The low supply current characteristic makes it ideal for battery-powered and low-power applications. The small SOT-25 package minimizes board space requirements. This voltage detector provides a simple and cost-effective solution for ensuring proper system operation in the presence of voltage fluctuations. It is a critical component in many electronic devices, protecting them from potential damage or malfunction due to power supply issues. The device is often employed with microcontrollers to provide a reliable power-on reset and brown-out protection. The output will remain low until the supply voltage rises above the detection voltage plus the hysteresis voltage.