Overview
The STM1816SWX7F is a low power reset circuit produced by STMicroelectronics. It is part of the STM181x family, designed to monitor power supplies for microcontrollers and assert a reset signal when the supply voltage drops below a preset threshold. This device ensures excellent circuit reliability without the need for additional external components, making it ideal for use in portable equipment and systems operating with +3.0 V, +3.3 V, or +5 V power supplies.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Voltage (VCC) | 1.0 to 5.5 | V |
| Supply Current (ICC) | 4 (typ.) to 16 (max.) | µA |
| Reset Thresholds (VRST) | 2.55 V, 2.88 V, 3.06 V, 4.37 V, 4.62 V (typ.) | V |
| Reset Pulse Width (trec) | 100 ms (min.) | ms |
| Operating Temperature | –40 to +105 | °C |
| Package | SOT23-3 | |
| Reset Output Configuration | Open-drain, active-low with internal 5.5 kΩ pull-up resistor | |
| 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
- Four output configurations: push-pull active-high, push-pull active-low, open-drain active-low, and open-drain active-low with push-button detect
- Low supply current - 4 µA (typ.)
- Guaranteed assertion down to VCC = 1.0 V (0 °C to 105 °C)
- Factory-trimmed reset thresholds
- Power supply transient immunity
- Push-button/manual reset detect (for certain models)
- Operating temperature: –40 °C to 105 °C
- Available in the SOT23-3 package
- Fully compatible with DS181x and MXD181x products
Applications
The STM1816SWX7F is suitable for a variety of applications, including portable electronic devices, embedded systems, and any microcontroller-based system that requires reliable power supply monitoring. It is particularly useful in environments where power supply stability is critical, such as in industrial control systems, medical devices, and automotive electronics.
Q & A
- What is the primary function of the STM1816SWX7F?
The primary function is to monitor the power supply voltage and assert a reset signal when the voltage drops below a preset threshold. - What are the available reset thresholds for the STM1816SWX7F?
The reset thresholds are available between 2.55 V and 4.62 V. - What is the typical supply current of the STM1816SWX7F?
The typical supply current is 4 µA. - What is the operating temperature range of the STM1816SWX7F?
The operating temperature range is –40 °C to +105 °C. - What package type is the STM1816SWX7F available in?
The device is available in the SOT23-3 package. - Does the STM1816SWX7F have manual reset capability?
No, the STM1816 does not have manual reset capability; this feature is available in models like STM1813 and STM1818. - How accurate are the reset thresholds of the STM1816SWX7F?
The reset thresholds have an accuracy of ± 2.5% over the operating temperature range. - Is the STM1816SWX7F compatible with other reset devices?
Yes, it is fully compatible with DS181x and MXD181x products. - What is the minimum reset pulse width of the STM1816SWX7F?
The minimum reset pulse width is 100 ms. - Does the STM1816SWX7F have power supply transient immunity?
Yes, it has power supply transient immunity.
