September 2010 Doc ID11464 Rev 8 1/25
1
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 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.
SOT23-3 (WX)
Table 1. Device summary
Order codes 5 V 3.3 V/
3.0 V
Active-low
reset
(push-pull)
Active-low
reset
(open-drain)
Active-high
reset
(push-pull)
Active-low reset
(open-drain,
bidirectional, with MR detect)
STM1810L/M ✔✔
STM1811L/M ✔✔
(1)
STM1812L/M ✔✔
STM1813L/M ✔ ✔
STM1815T/S/R ✔✔
STM1816T/S/R ✔✔
(1)
STM1817T/S/R ✔✔
STM1818T/S/R ✔✔
1. Active-low RST with internal pull-up resistor.
www.st.com
Contents STM1810/1811/1812/1813/1815/1816/1817/1818
2/25 Doc ID11464 Rev 8
Contents
1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 Functional block diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.2 Pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.2.1 Active-low RST output (push-pull) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.2.2 Active-low RST output (open-drain) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.2.3 Active-high RST output (push-pull) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.2.4 Active-low RST output (open-drain with internal 5.5 kΩ pull-up) with
manual reset detect . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.2.5 VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.2.6 VSS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1 Reset output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.2 Push-button detect reset (STM1813/1818) . . . . . . . . . . . . . . . . . . . . . . . . 9
2.3 Interfacing to bidirectional microcontrollers (MCU’s) . . . . . . . . . . . . . . . . . 9
2.4 Negative going VCC transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.5 Valid RST output down to VCC = 0 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3 Typical operating characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
4 Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5 DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
6 Package mechanical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
6.1 ECOPACK® . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
7 Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
STM1810/1811/1812/1813/1815/1816/1817/1818 List of tables
Doc ID11464 Rev 8 3/25
List of tables
Table 1. Device summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Table 2. Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Table 3. STM1810/STM1815 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 4. STM1811/STM1816 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 5. STM1812/STM1817 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 6. STM1813/STM1818 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Table 7. Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Table 8. Operating and AC measurement conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Table 9. DC and AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Table 10. SOT23-3 – 3-lead small outline transistor package mechanical data. . . . . . . . . . . . . . . . . 21
Table 11. Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Table 12. Marking description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Table 13. Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
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 VCC = 0 V (push-pull). . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Figure 12. Valid reset (RST) output down to VCC = 0 V (push-pull). . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 13. Supply current vs. temperature (no load) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 14. Normalized reset time-out period (trec) vs. temperature - VOD = VTH – VCC . . . . . . . . . . . 13
Figure 15. VCC-to-reset output delay vs. temperature - VOD = VTH – VCC . . . . . . . . . . . . . . . . . . . . . 14
Figure 16. Voltage output low vs. ISINK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 17. Voltage output high vs. ISOURCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 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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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
VSS Ground
RST Active-low reset output
RST(1)
1. For STM1812, STM1817.
Active-high reset output
VCC Supply voltage and input for reset threshold monitor
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STM1810/1811/1812/1813/1815/1816/1817/1818 Description
Doc ID11464 Rev 8 7/25
1.1 Functional block diagrams
Figure 4. Push-pull active-low output (STM1810/1812/1815/1817)
1. RST for STM1812 and STM1817.
Figure 5. Open-drain, active-low output (STM1811/1816)
1. 5.5 kΩ internal pull-up resistor.
Figure 6. Open-drain, active-low output (bidirectional, manual reset detect,
STM1813/1818)
1. 5.5 kΩ internal pull-up resistor.
1.2 Pin descriptions
See Figure 1 and Ta b l e 2 for a brief overview of the signals connected to this device.
1.2.1 Active-low RST output (push-pull)
Pulses low when VCC drops below VRST
, and stays low as long as VCC is below the reset
threshold. It remains low for trec after VCC rises above the reset threshold.
1.2.2 Active-low RST output (open-drain)
Pulses low when VCC drops below VRST
, and stays low as long as VCC is below the reset
threshold. It remains low for trec after VCC rises above the reset threshold. RST output has
an internal 5.5 kΩ pull-up resistor.
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Description STM1810/1811/1812/1813/1815/1816/1817/1818
8/25 Doc ID11464 Rev 8
1.2.3 Active-high RST output (push-pull)
Pulses high when VCC drops below VRST
, and stays high as long as VCC is below the reset
threshold. It remains high for trec after VCC rises above the reset threshold.
1.2.4 Active-low RST output (open-drain with internal 5.5 kΩ pull-up) with
manual reset detect
Pulses low when VCC drops below VRST
, or RST is externally pulled low for at least 1.5 µs.
It remains low for tPBRST after VCC rises above the reset threshold, or after the external
manual reset is released (see Figure 9). RST output has an internal 5.5 kΩ pull-up resistor.
1.2.5 VCC
Supply voltage and input for VRST comparator.
1.2.6 VSS
Ground, is the reference for the power supply. It must be connected to the system ground.
Table 3. STM1810/STM1815
Pin Name Function
1RST
Active-low reset output (push-pull)
2V
CC Supply voltage and input for reset threshold monitor
3V
SS Ground
Table 4. STM1811/STM1816
Pin Name Function
1RST
Active-low reset output (open-drain, with internal 5.5 kΩ pull-up resistor)
2V
CC Supply voltage and input for reset threshold monitor
3V
SS Ground
Table 5. STM1812/STM1817
Pin Name Function
1 RST Active-high reset output (push-pull)
2V
CC Supply voltage and input for reset threshold monitor
3V
SS Ground
Table 6. STM1813/STM1818
Pin Name Function
1RST
Active-low reset output (open-drain, with internal 5.5 kΩ pull-up) with push-
button/manual reset detect
2V
CC Supply voltage and input for reset threshold monitor
3V
SS Ground
STM1810/1811/1812/1813/1815/1816/1817/1818 Operation
Doc ID11464 Rev 8 9/25
2 Operation
2.1 Reset output
The STM181x asserts a reset signal to the microcontroller (MCU) whenever VCC goes
below the reset threshold (VRST), and is guaranteed valid down to VCC = 1.0 V (0 °C to
105 °C). A microcontroller’s (MCU) reset input starts the MCU in a known state. The
STM1810 - STM1813/ STM1815 - STM1818 low power reset circuits assert reset to prevent
code-execution errors during power-up, power-down, and brownout conditions (Figure 7).
During power-up, once VCC exceeds the reset threshold an internal timer keeps RST low for
the reset time-out period, trec. After this interval, RST returns high.
If VCC drops below the reset threshold, RST goes low. Each time RST is asserted, it stays
low for at least the reset time-out period. Any time VCC goes below the reset threshold, the
internal timer clears. The reset timer starts when VCC returns above the reset threshold.
Reset trec is also triggered by an externally initiated rising edge on the RST pin
(STM1813/STM1818), following a low signal of 1.5 µs minimum duration.
2.2 Push-button detect reset (STM1813/1818)
Many systems require push-button reset capability (Figure 8), allowing the user or external
logic circuitry to initiate reset. On the STM1813/STM1818, a logic low on RST held for
greater than 1.5 µs asserts a reset. RST deasserts following a 100 ms minimum reset time-
out delay (trec). A manual reset input shorter than 1.5 µs may release RST without the
100 ms minimum reset time-out delay. To facilitate use with mechanical switches, the
STM1813/STM1818 contain internal debounce circuitry. A debounced waveform is shown in
Figure 9 The RST output has an internal 5.5 kΩ pull-up resistor.
2.3 Interfacing to bidirectional microcontrollers (MCU’s)
As the RST output on the STM1811/STM1816 is open-drain, these devices interface easily
with MCU’s that have bidirectional reset pins. Connecting the µP supervisor’s reset (RST)
output directly to the microcontroller’s reset (RST) pin allows either device to assert reset
(Figure 10). No external pull-up resistor is required, as it is within the STM1811/STM1816.
2.4 Negative going VCC transients
The STM181x are relatively immune to negative-going VCC transients (glitches). Figure 19
shows typical transient duration versus reset comparator overdrive (for which the STM181x
will NOT generate a reset pulse). The graph was generated using a negative pulse applied
to VCC, starting at 0.5 V above the actual reset threshold and ending below it by the
magnitude indicated (comparator overdrive). The graph indicates the maximum pulse width
a negative VCC transient can have without causing a reset pulse. As the magnitude of the
transient increases (further below the threshold), the maximum allowable pulse width
decreases. Any combination of duration and overdrive which lies under the curve will NOT
generate a reset signal. Typically, a VCC transient that goes 100 mV below the reset
threshold and lasts 20 µs or less will not cause a reset pulse. A 0.1 µF bypass capacitor
mounted as close as possible to the VCC pin provides additional transient immunity.
Operation STM1810/1811/1812/1813/1815/1816/1817/1818
10/25 Doc ID11464 Rev 8
2.5 Valid RST output down to VCC = 0 V
When VCC falls below 1 V, the RST output no longer sinks current, but becomes an open
circuit. In most systems this is not a problem, as most MCUs do not operate below 1 V.
However, in applications where RST output must be valid down to 0 V, a pull-down resistor
may be added to hold the RST output low (see Figure 11). This resistor must be large
enough to not load the RST output, and still be small enough to pull the output to ground.
A 100 kΩ
resistor is recommended.
Note: The same situation applies for the active-high RST of the STM1810/1812. A 100 k
Ω
pull-up
resistor to VCC should be used if RST must remain valid for VCC < 1.0 V.
Figure 7. Reset timing diagram
1. RST for STM1812 and STM1817.
Figure 8. Push-button manual reset with MR detect (STM1813/1818)
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STM1810/1811/1812/1813/1815/1816/1817/1818 Operation
Doc ID11464 Rev 8 11/25
Figure 9. Manual reset timing diagram, switch bounce/debounce (STM1813/1818)
Figure 10. Interfacing MCUs with bidirectional reset pins (RST, open-drain, STM1811/1816)
Figure 11. Valid reset (RST) output down to VCC = 0 V (push-pull)
1. ~100 kΩ resistor recommended.
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Operation STM1810/1811/1812/1813/1815/1816/1817/1818
12/25 Doc ID11464 Rev 8
Figure 12. Valid reset (RST) output down to VCC = 0 V (push-pull)
1. ~100 kΩ resistor recommended.
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STM1810/1811/1812/1813/1815/1816/1817/1818 Typical operating characteristics
Doc ID11464 Rev 8 13/25
3 Typical operating characteristics
Typical values are at TA = 25 °C.
Figure 13. Supply current vs. temperature (no load)
Figure 14. Normalized reset time-out period (trec) vs. temperature
- VOD = VTH – VCC
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Typical operating characteristics STM1810/1811/1812/1813/1815/1816/1817/1818
14/25 Doc ID11464 Rev 8
Figure 15. VCC-to-reset output delay vs. temperature - VOD = VTH – VCC
Figure 16. Voltage output low vs. ISINK
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STM1810/1811/1812/1813/1815/1816/1817/1818 Typical operating characteristics
Doc ID11464 Rev 8 15/25
Figure 17. Voltage output high vs. ISOURCE
Figure 18. Normalized reset threshold vs. temperature
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Typical operating characteristics STM1810/1811/1812/1813/1815/1816/1817/1818
16/25 Doc ID11464 Rev 8
Figure 19. Max. transient duration NOT causing reset pulse vs. reset threshold
overdrive
1. Reset occurs above the line.
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STM1810/1811/1812/1813/1815/1816/1817/1818 Maximum rating
Doc ID11464 Rev 8 17/25
4 Maximum rating
Stressing the device above the rating listed in Ta b l e 7 may cause permanent damage to the
device. These are stress ratings only and operation of the device at these or any other
conditions above those indicated in the “Operating” sections of this specification is not
implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability. Refer also to the STMicroelectronics™ “SURE Program” and other relevant
quality documents.
Table 7. Absolute maximum ratings
Symbol Parameter Value Unit
TSTG Storage temperature (VCC Off) –55 to 150 °C
TSLD(1)
1. Reflow at peak temperature of 255 °C to 260 °C for < 30 seconds (total thermal budget not to exceed 180 °C
for between 90 to 150 seconds).
Lead solder temperature for 10 seconds 260 °C
VIO Input or output voltage –0.3 to VCC +0.3 V
VCC Supply voltage –0.3 to 7.0 V
IOOutput current 20 mA
PDPower dissipation 320 mW
DC and AC parameters STM1810/1811/1812/1813/1815/1816/1817/1818
18/25 Doc ID11464 Rev 8
5 DC and AC parameters
This section summarizes the operating measurement conditions, and the DC and AC
characteristics of the device. The parameters in the DC and AC characteristics tables that
follow, are derived from tests performed under the measurement conditions summarized in
Ta b l e 8 . Designers should check that the operating conditions in their circuit match the
operating conditions when relying on the quoted parameters.
Figure 20. AC testing input/output waveforms
Table 8. Operating and AC measurement conditions
Parameter STM1810 - 1818 Unit
VCC supply voltage 1.0 to 5.5 V
Ambient operating temperature (TA) –40 to 105 °C
Input rise and fall times ≤
5ns
Input pulse voltages 0.2 to 0.8 VCC V
Input and output timing ref. voltages 0.3 to 0.7 VCC V
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STM1810/1811/1812/1813/1815/1816/1817/1818 DC and AC parameters
Doc ID11464 Rev 8 19/25
Table 9. DC and AC characteristics
Sym. Alter-
native Description Test condition(1) Min. Typ. Max. Unit
VCC Operating voltage TA = 0 to +105 °C 1.0 5.5 V
TA = –40 to +105 °C 1.2 5.5 V
ICC VCC supply current VCC = 3.6 V, no load 4 10 µA
VCC = 5.5 V, no load 9 16 µA
VIH Input high voltage STM1813/1818 only 0.7
VCC
V
VIL Input low voltage STM1813/1818 only 0.4 V
VOH Output high voltage 0 < IOH < 500 µA VCC
– 0.5
VCC
– 0.1 V
IOH
RST output source current VCC
≥
VRST (max.), reset not asserted
(STM1810/STM1815) 350 µA
RST output source current VCC
≤
VRST (min.), reset asserted
(STM1812/STM1817) 350 µA
IOL
RST output sink current
VCC
≥
2.7 V, reset asserted,
VOUT = 0.4 V
(STM1810/1811/1813/1815/1816/1818)
10 mA
RST output sink current VCC
≥
2.7 V, reset not asserted,
VOUT = 0.4 V, (STM1812/1817) 10 mA
COUT Output capacitance(2) 10 pF
Reset thresholds
VRST Reset threshold
STM181xL 25 °C 4.62 V
–40 to 105 °C 4.50 4.75 V
STM181xM 25 °C 4.37 V
–40 to 105 °C 4.25 4.49 V
STM181xT 25 °C 3.06 V
–40 to 105 °C 2.98 3.15 V
STM181xS 25 °C 2.88 V
–40 to 105 °C 2.80 2.97 V
STM181xR 25 °C 2.55 V
–40 to 105 °C 2.47 2.64 V
tRD VCC to RST delay VCC = (VTH + 100 mV) falling to
(VTH – 200 mV) 25µs
trec RST pulse width VCC Rising 100 150 200 ms
Push-button reset detect (STM1813, STM1818)
tPB Push-button detect to RST STM1813/1818 1.5 µs
tPBRST Push-button RST time-out From rising edge 100 150 200 ms
Internal pull-up resistance STM1811/1816 3.5 5.5 7.5 kΩ
STM1813/1818 3.1 5.5 7.5 kΩ
1. Valid for ambient operating temperature: TA = –40 °C to 105 °C; VCC = 1.2 V to 5.5 V (except where noted).
2. The STM1811/1813/1816/1818 have an internal pull-up resistor which may sink 1 mA of current.
Package mechanical STM1810/1811/1812/1813/1815/1816/1817/1818
20/25 Doc ID11464 Rev 8
6 Package mechanical
6.1 ECOPACK®
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK® packages, depending on their level of environmental compliance. ECOPACK®
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK® is an ST trademark.
Figure 21. SOT23-3 – 3-lead small outline transistor package outline
1. Drawing is not to scale.
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STM1810/1811/1812/1813/1815/1816/1817/1818 Package mechanical
Doc ID11464 Rev 8 21/25
Table 10. SOT23-3 – 3-lead small outline transistor package mechanical data
Symbol
mm inches
Typ. Min. Max. Typ. Min. Max.
A 0.89 1.12 0.035 0.044
A1 0.01 0.10 0.001 0.004
A2 0.88 1.02 0.035 0.042
b 0.30 0.50 0.012 0.020
C 0.08 0.20 0.003 0.008
D 2.80 3.04 0.110 0.120
E 2.10 2.64 0.083 0.104
E1 1.20 1.40 0.047 0.055
e 0.89 1.03 0.035 0.041
e1 1.78 2.05 0.070 0.081
L 0.54 0.021
L1 0.40 0.60 0.016 0.024
Q 0 °8 ° 0 °8 °
N3 3
Part numbering STM1810/1811/1812/1813/1815/1816/1817/1818
22/25 Doc ID11464 Rev 8
7 Part numbering
Table 11. Ordering information scheme
Note: Contact the local ST sales office for availability.
For other options, or for more information on any aspect of this device, please contact the
ST Sales Office nearest you.
Example STM1810 L WX 7 F
Device type
STM181x
Reset threshold voltage
STM1810 - 1813
L = VRST = 4.50 V to 4.75 V (4.62 V typ.)
M = VRST = 4.25 V to 4.49 V (4.37 V typ.)
STM1815 - 1818
T = VRST = 2.98 V to 3.15 V (3.06 V typ.)
S = VRST = 2.80 V to 2.97 V (2.88 V typ.)
R = VRST = 2.47 V to 2.64 V (2.55 V typ.)
Package
WX = SOT23-3
Temperature range
7 = –40 to 105 °C
Shipping method
F = ECOPACK package, tape and reel
STM1810/1811/1812/1813/1815/1816/1817/1818 Part numbering
Doc ID11464 Rev 8 23/25
Table 12. Marking description
Part number Reset threshold Output Topside marking(1)
1. x = letter assigned to indicate assembly work week (i.e., A = WW01 and WW02, B = WW03 and WW04,
C = WW05 and WW06..., Z = WW51, WW52, and WW53).
STM1810L 4.62 V Push-pull RST 9AAx
STM1810M 4.37 V Push-pull RST 9ABx
STM1811L 4.62 V Open-drain RST 9AHx
STM1811M 4.37 V Open-drain RST 9AJx
STM1812L 4.62 V Push-pull RST 9AQx
STM1812M 4.37 V Push-pull RST 9ARx
STM1813L 4.62 V Open-drain RST 9AXx
STM1813M 4.37 V Open-drain RST 9AYx
STM1815T 3.06 V Push-pull RST 9BGx
STM1815S 2.88 V Push-pull RST 9BHx
STM1815R 2.55 V Push-pull RST 9BJx
STM1816T 3.06 V Open-drain RST 9BPx
STM1816S 2.88 V Open-drain RST 9BQx
STM1816R 2.55 V Open-drain RST 9BRx
STM1817T 3.06 V Push-pull RST 9BWx
STM1817S 2.88 V Push-pull RST 9BXx
STM1817R 2.55 V Push-pull RST 9BYx
STM1818T 3.06 V Open-drain RST 9CDx
STM1818S 2.88 V Open-drain RST 9CEx
STM1818R 2.55 V Open-drain RST 9CFx
Revision history STM1810/1811/1812/1813/1815/1816/1817/1818
24/25 Doc ID11464 Rev 8
8 Revision history
Table 13. Document revision history
Date Revision Changes
26-Aug-04 1.0 First Issue.
05-Oct-04 2.0 Update reset characteristics, add typical graphs, remove SC70
references (Figure , 1, 3, 6, 10, 11, 13, 14, 15, 16, 17, 18, 19; and 20,
Table 9, 11, and 12).
19-Nov-04 3.0 Update dimensions (Table 1 0 ).
07-Dec-04 4.0 Remove some voltage options (Ta bl e 1 , 10, 11, and 12).
29-Jun-05 5.0 Temperature range change (Figure 13, 14, 15, and 18; Ta b l e 8 , 9, and
11).
11-Oct-05 6.0 Update typical operating characteristics, Lead-free text (Figure 13, 14,
15, 16, 17, 18, and 19; Table 11, and 12).
28-Aug-2007 7 Document reformatted.
Update Ta b l e 1 2 .
02-Sep-2010 8 Document reformatted, updated Section 6.1: ECOPACK®, corrected
typo in Ta b le 9 , Table 11 and Ta b l e 1 2 .
STM1810/1811/1812/1813/1815/1816/1817/1818
Doc ID11464 Rev 8 25/25
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