STM1810 STM1811 STM1812 STM1813
STM1815 STM1816 STM1817 STM1818
Low power reset circuit
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 V
CC
= 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
Device summary
5V
✔
✔
✔
✔
✔
✔
✔
✔
✔
✔
(1)
✔
✔
3.3 V/
3.0 V
Active-low
reset
(push-pull)
✔
✔
(1)
✔
✔
Active-low
reset
(open-drain)
Active-high
reset
(push-pull)
Active-low reset
(open-drain,
bidirectional, with MR detect)
■
■
■
SOT23-3 (WX)
■
■
■
■
■
■
■
± 2.5% reset threshold accuracy:
(–40 °C to 105 °C)
Available in the SOT23-3 package
Fully compatible with DS181x and MXD181x
products.
Table 1.
Order codes
STM1810L/M
STM1811L/M
STM1812L/M
STM1813L/M
STM1815T/S/R
STM1816T/S/R
STM1817T/S/R
STM1818T/S/R
1. Active-low RST with internal pull-up resistor.
September 2010
Doc ID11464 Rev 8
1/25
www.st.com
1
Contents
STM1810/1811/1812/1813/1815/1816/1817/1818
Contents
1
Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1
1.2
Functional block diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.2.1
1.2.2
1.2.3
1.2.4
1.2.5
1.2.6
Active-low RST output (push-pull) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Active-low RST output (open-drain) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Active-high RST output (push-pull) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Active-low RST output (open-drain with internal 5.5 kΩ pull-up) with
manual reset detect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
V
CC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
V
SS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1
2.2
2.3
2.4
2.5
Reset output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Push-button detect reset (STM1813/1818) . . . . . . . . . . . . . . . . . . . . . . . . 9
Interfacing to bidirectional microcontrollers (MCU’s) . . . . . . . . . . . . . . . . . 9
Negative going V
CC
transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Valid RST output down to V
CC
= 0 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3
4
5
6
Typical operating characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Package mechanical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.1
ECOPACK
®
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7
8
Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
2/25
Doc ID11464 Rev 8
STM1810/1811/1812/1813/1815/1816/1817/1818
List of tables
List of tables
Table 1.
Table 2.
Table 3.
Table 4.
Table 5.
Table 6.
Table 7.
Table 8.
Table 9.
Table 10.
Table 11.
Table 12.
Table 13.
Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
STM1810/STM1815 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
STM1811/STM1816 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
STM1812/STM1817 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
STM1813/STM1818 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating and AC measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
DC and AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
SOT23-3 – 3-lead small outline transistor package mechanical data. . . . . . . . . . . . .
Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Marking description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
.....1
.....6
.....8
.....8
.....8
.....8
. . . . 17
. . . . 18
. . . . 19
. . . . 21
. . . . 22
. . . . 23
. . . . 24
Doc ID11464 Rev 8
3/25
List of figures
STM1810/1811/1812/1813/1815/1816/1817/1818
List of figures
Figure 1.
Figure 2.
Figure 3.
Figure 4.
Figure 5.
Figure 6.
Figure 7.
Figure 8.
Figure 9.
Figure 10.
Figure 11.
Figure 12.
Figure 13.
Figure 14.
Figure 15.
Figure 16.
Figure 17.
Figure 18.
Figure 19.
Figure 20.
Figure 21.
Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
SOT23-3 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Hardware hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Push-pull active-low output (STM1810/1812/1815/1817) . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Open-drain, active-low output (STM1811/1816) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Open-drain, active-low output (bidirectional, manual reset detect, STM1813/1818) . . . . . . 7
Reset timing diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Push-button manual reset with MR detect (STM1813/1818) . . . . . . . . . . . . . . . . . . . . . . . 10
Manual reset timing diagram, switch bounce/debounce (STM1813/1818) . . . . . . . . . . . . . 11
Interfacing MCUs with bidirectional reset pins (RST, open-drain, STM1811/1816) . . . . . . 11
Valid reset (RST) output down to V
CC
= 0 V (push-pull). . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Valid reset (RST) output down to V
CC
= 0 V (push-pull). . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Supply current vs. temperature (no load) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Normalized reset time-out period (t
rec
) vs. temperature - V
OD
= V
TH
– V
CC
. . . . . . . . . . . 13
V
CC
-to-reset output delay vs. temperature - V
OD
= V
TH
– V
CC
. . . . . . . . . . . . . . . . . . . . . 14
Voltage output low vs. I
SINK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Voltage output high vs. I
SOURCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Normalized reset threshold vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Max. transient duration NOT causing reset pulse vs. reset threshold overdrive. . . . . . . . . 16
AC testing input/output waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
SOT23-3 – 3-lead small outline transistor package outline . . . . . . . . . . . . . . . . . . . . . . . . 20
4/25
Doc ID11464 Rev 8
STM1810/1811/1812/1813/1815/1816/1817/1818
Description
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.
Doc ID11464 Rev 8
5/25
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