STM1810/1811/1812/1813/1815/1816/1817/1818

Description

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Description

STM181x devices are low power reset devices used to monitor power supplies for

reliability without additional external components when used with +3.0 V / +3.3 V

(STM1815–STM1818), and +5 V (STM1810–STM1813) power supply systems.

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

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.

(0 °C to +105 °C). They also provide a reset comparator designed to ignore fast transients

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. Figure 4 shows a typical

hardware hookup for STM181x devices to a Microcontroller.

Figure 2.

Logic diagram

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For STM1812, STM1817.

AI09648

STM181x

RST (RST)

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