The IMP811LEUS is a microprocessor supervisory circuit manufactured by IMP, Inc. (now acquired by Diodes Incorporated). It monitors the power supply voltage of a microprocessor system and provides a reset signal when the voltage falls below a certain threshold, preventing data corruption and ensuring proper operation.
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, but not guaranteed in all)
- 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 IMP811LEUS monitors a specific voltage threshold, typically 5V or 3.3V. When the supply voltage drops below the threshold, the device asserts a reset signal, holding the microprocessor in a reset state. The 'LE' in the part number specifies the specific voltage threshold and reset timeout period for this particular version. The 'US' suffix likely indicates the package type, commonly a small surface-mount package like SOT-23 or SC-70. The reset output is active-low and open-drain, requiring a pull-up resistor. A watchdog timer feature may or may not be present; the datasheet would need to be checked to confirm this. Supply current is very low, in the microampere range. Reset timeout period is designed to be sufficiently long for the power supply to stabilize following a voltage drop. This circuit is a critical component for reliable microprocessor system operation.
Consulting the IMP/Diodes Incorporated datasheet is essential to determine the precise voltage threshold, reset timeout period, presence/absence of the watchdog timer, and the package details for the IMP811LEUS.
