STM1818SWX7F Resets and Voltage Detectors by STMicroelectronics

Low power reset circuit

Status: Active
Series: STM1818
RoHS: Compliant
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STM181x devices are low power reset devices used to monitor power supplies for microcontrollers. They perform a single function: asserting a reset signal whenever V CC supply voltage drops below a preset value and keeping it asserted until V CC has risen above the preset threshold for a minimum period of time (t rec ). They provide excellent circuit reliability without additional external components when used with +3.0 V / +3.3 V (STM1815–STM1818), and +5 V (STM1810–STM1813) power supply systems. A precision voltage reference and comparator monitors the V CC input for an out-of-tolerance condition. When an invalid V CC condition occurs, the reset output ( RST ) is forced low (or high in the case of RST) and remains asserted for t rec after V CC rises above the reset threshold. The STM1813/1818 also keep reset asserted for t rec after the output is momentarily pulled to ground by an external push-button switch. The STM1812 and STM1817 have an active-high, push-pull output. The STM1810 and STM1815 (push-pull) and STM1811, STM1813, STM1816, and STM1818 (open-drain) have an active-low RST output. The open-drain devices (STM1811 / STM1813 / STM1816 / STM1818) also have an internal pull-up resistor to V CC . The STM1813 and STM1818 feature a debounced manual reset feature that asserts a reset if the RST pin is pulled low for more than 1.5 μs. When used to initiate manual reset, RST debounces signals from devices such as mechanical switches. For devices with this feature, the release of the external switch triggers the reset period. The STM181x devices are guaranteed to output the correct logic state for V CC down to 1.0 V (0 °C to +105 °C). They also provide a reset comparator designed to ignore fast transients on V CC . Reset thresholds are available between +2.55 V and +4.62 V. These small, low power devices are ideal for use in portable equipment. All are available in the space-saving 3-pin SOT23 package, and are specified from –40 °C to +105 °C.

Prices starting from US$0.40


Distributor Starting From Stock
Logo for Future Electronics Future Electronics US$0.46
6,000
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Logo for Newark Electronics Newark Electronics US$0.40
5,813
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Logo for Farnell Farnell US$0.49
5,813
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Logo for EBV Elektronik EBV Elektronik -
3,000
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Logo for Avnet America Avnet America US$0.50
-
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Features

Precision monitoring of 3 V, 3.3 V, and 5 V supply voltages
Four output configurations: Push-pull, active-high (STM1812,1817) Push-pull, active-low (STM1810,1815) Open-drain, active-low (STM1811,1816) Open-drain, active-low with push-button detect (STM1813,1818)
Push-pull, active-high (STM1812,1817)
Push-pull, active-low (STM1810,1815)
Open-drain, active-low (STM1811,1816)
Open-drain, active-low with push-button detect (STM1813,1818)
Reset pulse width - 100 ms (min.)
Low supply current - 4 μA (typ.)
Guaranteed assertion down to VCC= 1.0 V (0 °C to 105 °C)
Factory-trimmed reset thresholds of 2.55 V, 2.88 V, 3.06 V, 4.37 V, and 4.62 V (typ.)
Power supply transient immunity
Push-button/manual reset detect (STM1813/1818)
Operating temperature: –40 °C to 105 °C
± 2.5% reset threshold accuracy:(–40 °C to 105 °C)
Available in the SOT23-3 package
Fully compatible with DS181x and MXD181x products.

Alternative Descriptions

STM1818 Series 2.88 V 100 ms SMT Fixed Low Power Reset Circuit - SOT-23 | Future Electronics
Ic, Mpu Low Od Reset 2.88V, Sot23-3 | Newark Electronics
IC, MPU LOW OD RESET 2.88V, SOT23-3 | Farnell
Processor Supervisor 2.88V 3V/3.3V/5V 3-Pin SOT-23 T/R | EBV Elektronik
STMicroelectronics, STM1818SWX7F | RS


Frequently Asked Questions

Where can I find additional details, specifications and documents for a STM1818SWX7F?

Additional datasheets, footprints and schematics for STM1818SWX7F are listed on our Part Details page. You can also find images and similar parts to STM1818SWX7F on this page.

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What category does STM1818SWX7F fall under?

The STM1818SWX7F is listed under Reset and Supervisor ICs > Resets and Voltage Detectors.

Can I view similar or alternative parts?

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Is the STM1818SWX7F RoHS compliant?

Yes. This part has been flagged as RoHS Compliant by STMicroelectronics.

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Authorised distributors including Future Electronics, Newark Electronics, Farnell, EBV Elektronik and RS have stock available or on a lead time for STM1818SWX7F.

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