The RPI1391 is a reset IC manufactured by Rohm Semiconductor. It is designed to monitor the power supply voltage and generate a reset signal when the voltage drops below a certain threshold. This reset signal can be used to initialize microcontrollers and other digital circuits, preventing them from operating in an undefined state. The RPI1391 offers features such as low current consumption and a compact package, making it suitable for battery-powered and space-constrained applications.

Applications

• Microcontroller reset circuits
• Power supply monitoring
• Battery-powered devices
• Embedded systems
• Industrial control

Features

• Power supply voltage monitoring
• Reset signal generation
• Low current consumption
• Compact package
• Various threshold voltages
• Open drain output

Benefits

• Prevents microcontroller operation in an undefined state.
• Ensures reliable system startup after power loss or brownout.
• Low current consumption extends battery life in portable applications.
• Compact package saves board space.
• Various threshold voltages allow for customization to specific application requirements.

Technical Specifications

The RPI1391 typically operates with supply voltages in the range of 1.5V to 5.5V DC, depending on the specific version. It monitors the voltage and asserts a reset signal when the supply voltage falls below the preset threshold. The reset threshold voltage typically ranges from 2.3V to 4.6V. The current consumption during normal operation is typically very low, in the order of microamps. The reset output is usually an open-drain or open-collector type, requiring an external pull-up resistor. The reset timeout period is often fixed internally, but some variants may have adjustable timeout periods. The packaging is often SOT-23 or similar small surface-mount package. Always consult the Rohm datasheet to confirm the exact specifications for your particular application.