The TCM809SENB is a voltage monitoring circuit, often referred to as a voltage supervisor or reset IC, manufactured by TelCom Semiconductor, Inc. (now Microchip Technology). It is designed to monitor the supply voltage of a system and provide a reset signal when the voltage falls below a specified threshold. This ensures that the system starts up correctly and avoids erratic behavior during brownout conditions.

Applications

• Microcontroller Systems: Used to reset microcontrollers during power-up or brownout conditions, ensuring proper operation.
• Digital Signal Processors (DSPs): Monitors the supply voltage of DSPs and resets them if the voltage drops below the threshold.
• Memory Systems: Protects memory contents from corruption during power fluctuations by initiating a reset signal.
• Embedded Systems: Used in various embedded applications to ensure reliable system operation.
• Industrial Control Systems: Monitors the power supply of industrial equipment and resets the system in case of voltage drops.

Features

• Precise Voltage Threshold: Provides a highly accurate voltage threshold for monitoring the supply voltage.
• Active-Low Reset Output: Generates an active-low reset signal when the supply voltage falls below the threshold.
• Fixed Reset Timeout Period: Incorporates a fixed timeout period to ensure that the system remains in reset for a sufficient duration.
• Low Supply Current: Consumes very little current, making it suitable for battery-powered applications.
• Small Package Size: Available in a small surface-mount package, saving board space.

Benefits

• Reliable System Operation: Ensures that the system starts up correctly and operates reliably during voltage fluctuations.
• Protection Against Data Corruption: Prevents data corruption in memory systems by initiating a reset signal during brownout conditions.
• Simplified System Design: Reduces the complexity of system design by providing a simple and effective voltage monitoring solution.
• Low Power Consumption: Minimizes power consumption, extending battery life in portable devices.
• Cost-Effective Solution: Provides a cost-effective solution for voltage monitoring and reset generation.

Additional Details

The TCM809SENB typically has a reset threshold voltage of 3.08V. It operates over a wide supply voltage range and a wide temperature range. The reset output is active-low, meaning that it is low during the reset period and high when the supply voltage is above the threshold. The reset timeout period is typically in the range of 100-200ms. It is commonly available in a SOT-23 surface-mount package. This voltage supervisor is a simple and reliable solution for ensuring proper system operation in a variety of applications.