Overview
The STM1811MWX7F is a low-power reset circuit produced by STMicroelectronics. It is designed to monitor power supplies for microcontrollers, ensuring that the system operates reliably by asserting a reset signal when the supply voltage drops below a predefined threshold. This device is part of the STM181x family, which offers various configurations to suit different application needs.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Temperature Range | -40 to 105 | °C |
| Supply Voltage Range | 1.0 to 5.5 | V |
| Reset Thresholds | 2.55 V, 2.88 V, 3.06 V, 4.37 V, 4.62 V (typ.) | V |
| Reset Pulse Width | 100 ms (min.) | ms |
| Supply Current | 4 µA (typ.) at VCC = 3.6 V, no load | µA |
| Reset Output Configuration | Open-drain, active-low with internal 5.5 kΩ pull-up resistor | |
| Package Type | SOT23-3 | |
| Reset Threshold Accuracy | ± 2.5% (-40 °C to 105 °C) | % |
Key Features
- Precision monitoring of 3 V, 3.3 V, and 5 V supply voltages
- Open-drain, active-low output with internal 5.5 kΩ pull-up resistor
- Low supply current of 4 µA (typ.) at VCC = 3.6 V, no load
- Guaranteed assertion down to VCC = 1.0 V (0 °C to 105 °C)
- Power supply transient immunity
- Operating temperature range of -40 °C to 105 °C
- Factory-trimmed reset thresholds with ± 2.5% accuracy
Applications
The STM1811MWX7F is suitable for a variety of applications where reliable power supply monitoring is crucial, such as:
- Microcontroller systems requiring precise voltage monitoring
- Embedded systems in industrial, automotive, and consumer electronics
- Systems needing protection against power-up, power-down, and brownout conditions
- Devices requiring low power consumption and high reliability
Q & A
- What is the primary function of the STM1811MWX7F?
The primary function is to monitor the power supply voltage and assert a reset signal when the voltage drops below a predefined threshold. - What are the operating temperature ranges for the STM1811MWX7F?
The operating temperature range is -40 °C to 105 °C. - What is the typical supply current of the STM1811MWX7F?
The typical supply current is 4 µA at VCC = 3.6 V, no load. - What type of reset output does the STM1811MWX7F have?
The reset output is open-drain, active-low with an internal 5.5 kΩ pull-up resistor. - What are the reset thresholds for the STM1811MWX7F?
The reset thresholds are 2.55 V, 2.88 V, 3.06 V, 4.37 V, and 4.62 V (typ.). - Is the STM1811MWX7F RoHS compliant?
Yes, the STM1811MWX7F is RoHS compliant and comes in an Ecopack3 package. - What is the minimum reset pulse width of the STM1811MWX7F?
The minimum reset pulse width is 100 ms. - How does the STM1811MWX7F handle power supply transients?
The device has built-in power supply transient immunity. - What is the package type of the STM1811MWX7F?
The package type is SOT23-3. - Is the STM1811MWX7F compatible with other similar products?
Yes, it is fully compatible with DS181x and MXD181x products.
