Product overview
Description
STM181x devices are low power reset devices used to monitor power supplies for microcontrollers. They perform a single function: asserting a reset signal whenever VCCsupply voltage drops below a preset value and keeping it asserted until VCChas risen above the preset threshold for a minimum period of time (trec). 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 VCCinput for an out-of-tolerance condition. When an invalid VCCcondition occurs, the reset output (RST) is forced low (or high in the case of RST) and remains asserted for trecafter VCCrises above the reset threshold. The STM1813/1818 also keep reset asserted for trecafter 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 RSToutput. The open-drain devices (STM1811 / STM1813 / STM1816 / STM1818) also have an internal pull-up resistor to VCC. The STM1813 and STM1818 feature a debounced manual reset feature that asserts a reset if the RSTpin is pulled low for more than 1.5 μs. When used to initiate manual reset, RSTdebounces 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 VCCdown to 1.0 V (0 °C to +105 °C). They also provide a reset comparator designed to ignore fast transients on VCC.
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.
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All 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)
- 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.
EDA Symbols, Footprints and 3D Models
Quality and Reliability
Part Number | Marketing Status | Package | Grade | RoHS Compliance Grade | Material Declaration** |
---|---|---|---|---|---|
STM1810LWX7F | Active | SOT23 | Industrial | Ecopack3 | |
STM1810MWX7F | Active | SOT23 | Industrial | Ecopack3 |
(**) The Material Declaration forms available on st.com may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.
Sample & Buy
Part Number | Marketing Status | Budgetary Price (US$)*/Qty | Order from ST | Order from distributors | Package | Packing Type | RoHS | Country of Origin | ECCN (US) | ECCN (EU) | Operating temperature (°C) | Operating Temperature (°C) (max) | ||
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min | max | |||||||||||||
STM1810MWX7F | | | distributors No availability of distributors reported, please contact our sales office | |||||||||||
STM1810LWX7F | | | distributors No availability of distributors reported, please contact our sales office |
STM1810MWX7F Active
STM1810LWX7F Active
(*) Suggested Resale Price (USD) per defined quantity for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors