The IMP811SEUR is a microprocessor supervisory circuit manufactured by IMP, Inc. (now acquired by Diodes Incorporated). This device monitors the power supply voltage of a microprocessor system and provides reset signals when the voltage falls below a certain threshold, preventing erratic behavior and data corruption.

Applications:

• Microprocessor-based systems
• Embedded systems
• Industrial control systems
• Automotive electronics
• Consumer electronics

Features:

• Precision voltage monitoring
• Active-low reset output
• Open-drain reset output
• Internal watchdog timer (in some versions)
• Small package size

Benefits:

• Prevents data corruption and system crashes due to low voltage
• Ensures proper system startup and shutdown
• Simplifies system design by integrating voltage monitoring and reset functions
• Improves system reliability and robustness
• Reduces board space requirements

Additional Details:

The IMP811SEUR monitors a specific voltage threshold, typically 5V or 3.3V. When the supply voltage drops below this threshold, the device asserts a reset signal, holding the microprocessor in a reset state until the voltage recovers. The 'SE' in the part number likely denotes the specific voltage threshold and reset timeout period. The 'UR' suffix likely indicates the package type, which is typically a small surface-mount package such as SOT-23 or SC-70. The reset output is usually active-low and open-drain, requiring a pull-up resistor. A watchdog timer may be integrated to detect if the microprocessor stops executing code correctly. Supply current is very low, typically in the microampere range. Reset timeout is designed to hold reset active long enough for the power supply to stabilize. This is an essential component for any microprocessor-based system to ensure reliable operation.

Designers will need to refer to the IMP/Diodes Incorporated datasheet to confirm specific parameters such as the voltage threshold, reset timeout period, and package dimensions.