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STM1810/1811/1812/1813/1815/1816/1817/1818
Description
Doc ID11464 Rev 8
5/25
1
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 VCC
supply voltage drops below a preset value and keeping it asserted until VCC has 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 VCC input for an out-of-tolerance
condition. When an invalid VCC condition occurs, the reset output (RST) is forced low
(or high in the case of RST) and remains asserted for trec after VCC rises above the reset
threshold. The STM1813/1818 also keep reset asserted for trec 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 VCC. 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 VCC down 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.
Figure 1.
Logic diagram
1.
For STM1812, STM1817.


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