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STM1816RWX7F

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P25
List of figures STM1810/1811/1812/1813/1815/1816/1817/1818
4/25 Doc ID11464 Rev 8
List of figures
Figure 1. Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Figure 2. SOT23-3 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 3. Hardware hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 4. Push-pull active-low output (STM1810/1812/1815/1817). . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 5. Open-drain, active-low output (STM1811/1816) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 6. Open-drain, active-low output (bidirectional, manual reset detect, STM1813/1818) . . . . . . 7
Figure 7. Reset timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 8. Push-button manual reset with MR
detect (STM1813/1818) . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 9. Manual reset timing diagram, switch bounce/debounce (STM1813/1818). . . . . . . . . . . . . 11
Figure 10. Interfacing MCUs with bidirectional reset pins (RST
, open-drain, STM1811/1816) . . . . . . 11
Figure 11. Valid reset (RST
) output down to V
CC
= 0 V (push-pull). . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 12. Valid reset (RST) output down to V
CC
= 0 V (push-pull). . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 13. Supply current vs. temperature (no load) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 14. Normalized reset time-out period (t
rec
) vs. temperature - V
OD
= V
TH
– V
CC
. . . . . . . . . . . 13
Figure 15. V
CC
-to-reset output delay vs. temperature - V
OD
= V
TH
– V
CC
. . . . . . . . . . . . . . . . . . . . . 14
Figure 16. Voltage output low vs. I
SINK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 17. Voltage output high vs. I
SOURCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 18. Normalized reset threshold vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 19. Max. transient duration NOT causing reset pulse vs. reset threshold overdrive. . . . . . . . . 16
Figure 20. AC testing input/output waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 21. SOT23-3 – 3-lead small outline transistor package outline . . . . . . . . . . . . . . . . . . . . . . . . 20
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 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.
Figure 1. Logic diagram
1. For STM1812, STM1817.
!)
6
##
34-X
6
33
234234

Description STM1810/1811/1812/1813/1815/1816/1817/1818
6/25 Doc ID11464 Rev 8
Figure 2. SOT23-3 connections
2. RST for STM1812 and STM1817.
Figure 3. Hardware hookup
1. RST for STM1812 and STM1817 (see Table 1).
2. Only valid for STM1813 and STM1818.
Table 2. Signal names
Symbol Description
V
SS
Ground
RST Active-low reset output
RST
(1)
1. For STM1812, STM1817.
Active-high reset output
V
CC
Supply voltage and input for reset threshold monitor
!)
234234
6
33
6
##
!)A
6
##
6
33
6
##
-#534-X
234

6
##
6
33
2ESET
)NPUT
0USHBUTTON
RESET

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STM1816RWX7F

Mfr. #:
Buy STM1816RWX7F
Manufacturer:
STMicroelectronics
Description:
Supervisory Circuits 2.55VRST Active Low Open Drain reset
Lifecycle:
New from this manufacturer.
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