The MIC809-5SU is a precision voltage supervisor designed for monitoring voltage levels in electronic circuits. Manufactured by Micrel, now part of Microchip Technology, this device offers a cost-effective and reliable solution for ensuring system integrity and preventing data corruption in voltage-sensitive applications.

Applications

• Microprocessor systems
• Microcontroller systems
• Battery-powered devices
• Critical voltage monitoring
• Portable equipment

Features

• Precision voltage monitoring: Accurately monitors the input voltage level.
• Active-low RESET output: Asserts a low signal when the input voltage falls below the threshold.
• Open-drain output: Allows for flexible connection to various logic families.
• Low supply current: Minimizes power consumption in battery-powered applications.
• Small SOT-23 package: Reduces board space requirements.
• Fixed threshold voltage: Preset voltage threshold for ease of use.

Benefits

• Prevents system malfunctions: By resetting the system when the supply voltage is too low.
• Protects data integrity: Avoids data corruption due to voltage drops.
• Extends battery life: Due to its low current consumption.
• Simplified design: Requires minimal external components.
• Increased system reliability: Provides a reliable means of voltage monitoring.

Additional Details

The MIC809-5SU monitors a single voltage threshold. When the monitored voltage falls below the factory-trimmed threshold, the RESET output is asserted low. The RESET output remains low until the monitored voltage rises above the threshold, plus a built-in hysteresis. This hysteresis prevents unwanted oscillations of the RESET output. The device operates over a wide temperature range, typically -40°C to +85°C, making it suitable for use in various environments. Its small SOT-23 package makes it ideal for space-constrained applications. The specific threshold voltage is determined by the part number suffix; the MIC809-5SU typically monitors 5V systems but other voltage options exist. It requires a minimal number of external components, further simplifying design and reducing cost.