The SGM803-SXN3L/TR is a microprocessor reset circuit manufactured by SG Micro Corp. It's designed to monitor the power supply voltage of a microprocessor, microcontroller, or other digital system and assert a reset signal when the voltage falls below a predefined threshold. This prevents erratic operation and ensures proper system initialization.

Applications

• Microprocessor/Microcontroller Reset: Providing a reliable reset signal during power-up and brown-out conditions.
• Power-On Reset (POR): Automatically resetting the system when power is applied.
• Brown-Out Detection: Preventing data corruption and system instability due to low voltage.
• Voltage Monitoring: Supervising power supply rails to ensure they remain within acceptable limits.
• Embedded Systems: General-purpose reset functionality in embedded applications.

Features

• Precision Voltage Detection: Accurately monitors the power supply voltage.
• Reset Output: Asserts a reset signal when the voltage drops below the threshold.
• Fixed Threshold Voltage: Predefined threshold voltage for detecting undervoltage conditions.
• Low Quiescent Current: Minimizes power consumption in standby mode.
• Small Package: Available in a compact XN3L package for space-constrained applications.
• Active-Low Reset Output: Reset signal is active low.

Benefits

• Improved System Reliability: Prevents system crashes and data corruption due to low voltage.
• Simplified Design: Integrates voltage monitoring and reset generation into a single device.
• Reduced Power Consumption: Low quiescent current prolongs battery life.
• Space-Saving Design: Small package enables high-density circuit layouts.
• Automatic Reset: Automatically resets the system during power-up and brown-out conditions.

Additional Details

The SGM803-SXN3L/TR uses an internal precision voltage reference and comparator to accurately detect undervoltage conditions. The reset output remains asserted for a specified time period after the voltage recovers above the threshold (reset timeout period), ensuring that the microprocessor has sufficient time to initialize correctly. The reset output is an active-low signal, meaning that it is low during reset and high during normal operation. The device is typically supplied in tape and reel packaging for automated assembly. It's essential to consult the datasheet for detailed electrical characteristics, timing diagrams, and application notes. Proper decoupling capacitors are recommended to ensure stable operation. The specific reset threshold voltage for this part number (SGM803-SXN3L/TR) can be found in the datasheet.