STM1818LSWX7F [STMICROELECTRONICS]
Low power reset circuit; 低功耗复位电路
| 型号： | STM1818LSWX7F |
| 厂家： | 
ST |
| 描述： | Low power reset circuit |
| 文件： | 总25页 (文件大小：262K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
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)
SOT23-3 (WX)
–
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 = 1.0 V
CC
(0 °C to 105 °C)
●
●
Operating temperature: –40 °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)
± 2.5 % reset threshold accuracy:
(–40 °C to 105 °C)
●
●
Power supply transient immunity
●
●
Available in the SOT23-3 package
Push-button/manual reset detect
(STM1813/1818)
Fully compatible with DS181x and MXD181x
products.
Table 1.
Device summary
Active-Low Active-Low Active-High
RESET RESET RESET
(Push-Pull) (Open Drain) (Push-Pull)
Active-Low RESET
(Open Drain,
Bidirectional, with MR Detect)
3.3 V/
3.0 V
Order codes 5 V
STM1810L/M
STM1811L/M
STM1812L/M
STM1813L/M
STM1815T/S/R
STM1816T/S/R
STM1817T/S/R
STM1818T/S/R
●
●
●
●
●
(1)
●
●
●
●
●
●
●
●
●
(1)
●
●
1. Active-low RST with internal pull-up resistor.
August 2007
Rev 7
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
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
1.2.5
1.2.6
V
V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
CC
SS
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 transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
CC
Valid RST output down to V = 0 V . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
CC
3
4
5
6
7
8
Typical operating characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Maximum rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
DC and AC parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Package mechanical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
2/25
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
STM1810/STM1815 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
STM1811/STM1816 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
STM1812/STM1817 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
STM1813/STM1818 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Operating and AC measurement conditions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
DC and AC characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
SOT23-3 – 3-lead small outline transistor package mechanical data. . . . . . . . . . . . . . . . . 21
Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
Marking description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
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.
Package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
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
Figure 10. Manual reset timing diagram, switch bounce/debounce (STM1813/1818). . . . . . . . . . . . . 11
Figure 11. Interfacing MCUs with bidirectional reset pins (RST, open drain, STM1811/1816) . . . . . . 11
Figure 12. Valid reset (RST) output down to V = 0 V (push-pull). . . . . . . . . . . . . . . . . . . . . . . . . . . 11
CC
Figure 13. Valid reset (RST) output down to V
= 0 V (push-pull). . . . . . . . . . . . . . . . . . . . . . . . . . . 12
CC
Figure 14. Supply current vs. temperature (no load) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 15. Normalized reset time-out period (t ) vs. temperature
rec
- V = V – V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
OD
TH
CC
Figure 16.
V
-to-reset output delay vs. temperature - V = V – V
. . . . . . . . . . . . . . . . . . . . . 14
CC
OD
TH
CC
Figure 17. Voltage output low vs. I
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
SINK
Figure 18. Voltage output high vs. I
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
SOURCE
Figure 19. Normalized reset threshold vs. temperature. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 20. Max transient duration NOT causing reset pulse vs. reset threshold overdrive . . . . . . . . . 16
Figure 21. AC testing input/output waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 22. SOT23-3 – 3-lead small outline transistor package outline . . . . . . . . . . . . . . . . . . . . . . . . 20
4/25
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 has risen above
CC
the preset threshold for a minimum period of time (t ). They provide excellent circuit
rec
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 input for an out-of-tolerance
CC
condition. When an invalid V
condition occurs, the reset output (RST) is forced low (or
CC
high in the case of RST) and remains asserted for t after V rises above the reset
rec
CC
threshold. The STM1813/1818 also keep reset asserted for t after the output is
rec
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 . The
CC
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 down to 1.0 V
CC
(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 4 shows a typical
hardware hookup for STM181x devices to a Microcontroller.
Figure 2.
Logic diagram
V
CC
(1)
STM181x
RST (RST)
V
SS
AI09648
1. For STM1812, STM1817.
5/25
Description
STM1810/1811/1812/1813/1815/1816/1817/1818
Table 2.
Signal names
V
Ground
SS
RST
RST
Active-low Reset Output
Active-high Reset Output
(1)
V
Supply Voltage and Input for Reset Threshold Monitor
CC
1. For STM1812, STM1817.
Figure 3.
SOT23-3 connections
1
2
RST (RST)
V
3
SS
V
CC
AI09649
2. RST for STM1812 and STM1817.
Figure 4.
Hardware hookup
V
CC
V
V
CC
CC
STM181x
MCU
(1)
RESET
Input
RST
Push-button
(2)
RESET
V
V
SS
SS
AI09652a
1. RST for STM1812 and STM1817 (see Table 1).
2. Only valid for STM1813 and STM1818.
6/25
STM1810/1811/1812/1813/1815/1816/1817/1818
Description
1.1
Functional block diagrams
Figure 5.
Push-pull active-low output (STM1810/1812/1815/1817)
VCC
t
RST(1)
rec
Generator
VRST
COMPARE
AI09651a
1. RST for STM1812 and STM1817.
Figure 6.
Open drain, active-low output (STM1811/1816)
(1)
5.5 kΩ
V
CC
t
rec
Generator
V
COMPARE
RST
RST
AI09672
1. 5.5 kΩ internal pull-up resistor.
Figure 7.
Open drain, active-low output (bidirectional, manual reset detect,
STM1813/1818)
(1)
5.5 kΩ
Push-button
Detect
RST
V
CC
t
rec
Generator
V
COMPARE
RST
AI09673
1. 5.5 kΩ internal pull-up resistor.
1.2
Pin descriptions
See Figure 2 and Table 2 for a brief overview of the signals connected to this device.
1.2.1
Active-low RST output (push-pull)
Pulses low when V drops below V , and stays low as long as V is below the reset
CC
CC
RST
threshold. It remains low for t after V rises above the reset threshold.
rec
CC
1.2.2
Active-low RST output (open drain)
Pulses low when V drops below V , and stays low as long as V is below the reset
CC
CC
RST
threshold. It remains low for t after V rises above the reset threshold. RST output has
rec
CC
an internal 5.5 kΩ pull-up resistor.
7/25
Description
STM1810/1811/1812/1813/1815/1816/1817/1818
1.2.3
Active-high RST output (push-pull)
Pulses high when V
drops below V
, and stays high as long as V
is below the reset
CC
CC
RST
threshold. It remains high for t after V rises above the reset threshold.
rec
CC
1.2.4
Active-low RST output (open drain with internal 5.5 kΩ pull-up) with
manual reset detect
Pulses low when V drops below V
, or RST is externally pulled low for at least 1.5 µs. It
RST
CC
remains low for t
after V rises above the reset threshold, or after the external
PBRST
CC
manual reset is released (see Figure 10). RST output has an internal 5.5 kΩ pull-up resistor.
1.2.5
1.2.6
V
CC
Supply voltage and input for V
comparator.
RST
V
SS
Ground, is the reference for the power supply. It must be connected to the system ground.
Table 3.
Pin
STM1810/STM1815
Name
Function
1
2
3
RST Active-low Reset Output (Push-pull)
V
Supply Voltage and Input for Reset Threshold Monitor
Ground
CC
V
SS
Table 4.
Pin
STM1811/STM1816
Name
Function
1
2
3
RST Active-low Reset Output (Open Drain, with internal 5.5 kΩ pull-up resistor)
V
Supply Voltage and Input for Reset Threshold Monitor
Ground
CC
V
SS
Table 5.
Pin
STM1812/STM1817
Name
Function
1
2
3
RST Active-high Reset Output (Push-pull)
V
Supply Voltage and Input for Reset Threshold Monitor
Ground
CC
V
SS
Table 6.
Pin
STM1813/STM1818
Name
Function
1
RST
Active-low Reset Output (Open Drain, with internal 5.5 kΩ pull-up) with Push-
Button/Manual Reset Detect
2
3
V
Supply Voltage and Input for Reset Threshold Monitor
Ground
CC
V
SS
8/25
STM1810/1811/1812/1813/1815/1816/1817/1818
Operation
2
Operation
2.1
Reset output
The STM181x asserts a reset signal to the Microcontroller (MCU) whenever V goes
CC
below the reset threshold (V
), and is guaranteed valid down to V = 1.0 V (0 °C to
RST
CC
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 8).
During power-up, once V exceeds the reset threshold an internal timer keeps RST low for
CC
the reset time-out period, t . After this interval, RST returns high.
rec
If V
drops below the reset threshold, RST goes low. Each time RST is asserted, it stays
CC
low for at least the reset time-out period. Any time V goes below the reset threshold, the
CC
internal timer clears. The reset timer starts when V
returns above the reset threshold.
CC
Reset t is also triggered by an externally initiated rising edge on the RST pin
rec
(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 9), 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 (t ). A manual reset input shorter than 1.5 µs may release RST without the
rec
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 10 The RST output has an internal 5.5 kΩ pull-up resistor.
2.3
2.4
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 11). No external pull-up resistor is required, as it is within the STM1811/STM1816.
Negative going VCC transients
The STM181x are relatively immune to negative-going V
transients (glitches). Figure 20
CC
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 V
starting at 0.5 V above the actual reset threshold and ending below it by the
CC,
magnitude indicated (comparator overdrive). The graph indicates the maximum pulse width
a negative V transient can have without causing a reset pulse. As the magnitude of the
CC
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 V transient that goes 100 mV below the reset
CC
9/25
Operation
STM1810/1811/1812/1813/1815/1816/1817/1818
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 V
pin provides additional transient immunity.
CC
2.5
Valid RST output down to VCC = 0 V
When V falls below 1 V, the RST output no longer sinks current, but becomes an open
CC
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 12). 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 kΩ pull-up
resistor to V should be used if RST must remain valid for V < 1.0 V.
CC
CC
Figure 8.
Reset timing diagram
V
CC
V
RST
V
(min)
CC
t
t
RST
rec
rec
RST(1)
AI09653
1. RST for STM1812 and STM1817.
Figure 9.
Push-button manual reset with MR detect (STM1813/1818)
V
CC
V
CC
STM1813
STM1818
5.5 kΩ
Reset
Micro RESET
Monitor
RST
Push-button RESET
V
SS
AI09654
10/25
STM1810/1811/1812/1813/1815/1816/1817/1818
Operation
Figure 10. Manual reset timing diagram, switch bounce/debounce (STM1813/1818)
V
CC
t
t
PBRST
PBRST
(Open)
Switch Bounce
(Closed)
External
Push-button
RST
AI09655
Figure 11. Interfacing MCUs with bidirectional reset pins (RST, open drain,
STM1811/1816)
V
CC
V
STM1811
STM1816
V
CC
CC
5.5 kΩ
MCU
RST
Input
RST
V
V
SS
SS
AI09656
Figure 12. Valid reset (RST) output down to V = 0 V (push-pull)
CC
V
CC
V
V
CC
STM1810
STM1815
CC
MCU
RST
Input
RST
(1)
R
P
V
V
SS
SS
AI09657
1. ~100 kΩ resistor recommended.
11/25
Operation
STM1810/1811/1812/1813/1815/1816/1817/1818
Figure 13. Valid reset (RST) output down to V = 0 V (push-pull)
CC
VCC
V
STM1812
STM1817
CC
V
CC
(1)
R
P
MCU
RST
RST
Input
V
V
SS
SS
AI09658
1. ~100 kΩ resistor recommended.
12/25
STM1810/1811/1812/1813/1815/1816/1817/1818
Typical operating characteristics
3
Typical operating characteristics
Typical values are at T = 25 °C.
A
Figure 14. Supply current vs. temperature (no load)
10
8
6
4
V
CC
V
CC
= 3 V
= 5 V
2
0
–40
–20
0
20
40
60
80
100
Temperature (˚C)
AI10402b
Figure 15. Normalized reset time-out period (t ) vs. temperature
rec
- V
= V – V
OD
TH CC
155
153
151
149
147
145
143
141
139
137
135
–40
–20
0
20
40
60
80
100
Temperature (˚C)
AI10403b
13/25
Typical operating characteristics
STM1810/1811/1812/1813/1815/1816/1817/1818
Figure 16.
V
-to-reset output delay vs. temperature - V = V – V
CC OD TH CC
5
4
3
2
1
0
–40
–20
0
20
40
60
80
100
Temperature (˚C)
AI10404b
Figure 17. Voltage output low vs. I
SINK
0.20
0.16
0.12
0.08
0.04
0.00
0
3
6
9
12
Output Current (mA)
AI10406b
14/25
STM1810/1811/1812/1813/1815/1816/1817/1818
Typical operating characteristics
Figure 18. Voltage output high vs. I
SOURCE
0.30
0.25
0.20
0.15
0.10
0.05
0.00
V
= 3 V
CC
2.5
0.0
0.5
1.0
1.5
2.0
3.0
Output Current (mA)
AI10407b
Figure 19. Normalized reset threshold vs. temperature
1.010
1.005
1.000
0.995
0.990
–40
–20
0
20
40
60
80
100
Temperature (˚C)
AI10405b
15/25
Typical operating characteristics
STM1810/1811/1812/1813/1815/1816/1817/1818
Figure 20. Max transient duration NOT causing reset pulse vs. reset threshold
overdrive
50
45
40
35
30
25
20
15
10
5
0
10
100
1000
Reset Threshold Overdrive (mV)
AI10408b
1. Reset occurs above the line.
16/25
STM1810/1811/1812/1813/1815/1816/1817/1818
Maximum rating
4
Maximum rating
Stressing the device above the rating listed in Table 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.
Symbol
Absolute maximum ratings
Parameter
Value
Unit
T
Storage Temperature (V Off)
–55 to 150
260
°C
°C
V
STG
(1)
CC
T
Lead Solder Temperature for 10 seconds
Input or Output Voltage
Supply Voltage
SLD
V
–0.3 to V +0.3
IO
CC
V
–0.3 to 7.0
20
V
CC
I
Output Current
mA
mW
O
P
Power Dissipation
320
D
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).
17/25
DC and AC parameters
STM1810/1811/1812/1813/1815/1816/1817/1818
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
Table 8. Designers should check that the operating conditions in their circuit match the
operating conditions when relying on the quoted parameters.
Table 8.
Operating and AC measurement conditions
Parameter
STM1810 - 1818
1.0 to 5.5
–40 to 105
≤5
Unit
V
V
Supply Voltage
CC
Ambient Operating Temperature (T )
°C
ns
V
A
Input Rise and Fall Times
Input Pulse Voltages
0.2 to 0.8 V
0.3 to 0.7 V
CC
CC
Input and Output Timing Ref. Voltages
V
Figure 21. AC testing input/output waveforms
0.8 V
CC
0.7 V
CC
0.3 V
CC
0.2 V
CC
AI02568
18/25
STM1810/1811/1812/1813/1815/1816/1817/1818
DC and AC parameters
Table 9.
Sym
DC and AC characteristics
Alter-
native
(1)
Description
Test Condition
Min
Typ Max Unit
T = 0 to +105 °C
1.0
1.2
5.5
5.5
10
V
V
A
V
Operating Voltage
CC
T = –40 to +105 °C
A
V
V
= 3.6 V, No load
= 5.5 V, No load
4
9
µA
µA
CC
CC
I
V
Supply Current
CC
CC
16
0.7
V
Input High Voltage
Input Low Voltage
Output High Voltage
STM1813/1818 only
STM1813/1818 only
V
V
V
IH
V
CC
V
0.4
IL
V
V
CC
CC
V
0 < I
< 500 µA
OH
OH
– 0.5 – 0.1
RST Output Source
Current
V
≥ V
(max), Reset not asserted
(STM1810/STM1815)
CC
RST
350
µA
µA
I
OH
RST Output Source
Current
V
≤ V
(min), Reset asserted
RST
(STM1812/STM1817)
CC
350
V
≥ 2.7 V, Reset asserted,
CC
RST Output Sink Current
10
10
mA
V
= 0.4 V
OUT
(STM1810/1811/1813/1815/1816/1818)
I
OL
V
V
≥ 2.7 V, Reset not asserted,
= 0.4 V, (STM1812/1817)
CC
RST Output Sink Current
mA
pF
OUT
(2)
C
Output Capacitance
10
OUT
Reset Thresholds
STM181xL
25 °C
–40 to 105 °C
25 °C
4.62
4.50
V
V
V
V
V
V
V
V
V
V
4.75
4.49
3.15
2.97
4.37
STM181xM
STM181xT
STM181xS
STM181xR
–40 to 105 °C
25 °C
4.25
3.06
V
Reset Threshold
RST
–40 to 105 °C
25 °C
2.98
2.88
–40 to 105 °C
25 °C
2.80
2.55
–40 to 105 °C
2.47
2.64
5
V
= (V + 100 mV) falling to
TH
CC
t
V
to RST Delay
CC
2
µs
RD
(V – 200 mV)
TH
t
RST Pulse Width
V
Rising
CC
100
150 200 ms
rec
Push-Button Reset Detect (STM1813, STM1818)
t
Push-button Detect to RST
STM1813/1818
From Rising Edge
STM1811/1816
STM1813/1818
1.5
100
3.5
3.1
µs
PB
t
Push-button RST Time-out
150 200 ms
PBRST
5.5 7.5
5.5 7.5
kΩ
kΩ
Internal Pull-up Resistance
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.
19/25
Package mechanical
STM1810/1811/1812/1813/1815/1816/1817/1818
6
Package mechanical
®
In order to meet environmental requirements, ST offers these devices in ECOPACK
packages. These packages have a Lead-free second level interconnect. The category of
second Level Interconnect is marked on the package and on the inner box label, in
compliance with JEDEC Standard JESD97.
The maximum ratings related to soldering conditions are also marked on the inner box label.
ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com.
Figure 22. SOT23-3 – 3-lead small outline transistor package outline
E
E1
M
0.15
C A B
B
A1
1
e
D
e1
3X
M
0.20
C A B
0.10 C
C
A2
A
A
3X b
C
θ
C
L1
L
SOT23-3
1. Drawing is not to scale.
20/25
STM1810/1811/1812/1813/1815/1816/1817/1818
Package mechanical
inches
Table 10.
Symbol
SOT23-3 – 3-lead small outline transistor package mechanical data
mm
Min
Typ
Max
Typ
Min
Max
A
A1
A2
b
0.89
0.01
0.88
0.30
0.08
2.80
2.10
1.20
0.89
1.78
1.12
0.10
1.02
0.50
0.20
3.04
2.64
1.40
1.03
2.05
0.035
0.001
0.035
0.012
0.003
0.110
0.083
0.047
0.035
0.070
0.044
0.004
0.042
0.020
0.008
0.120
0.104
0.055
0.041
0.081
C
D
E
E1
e
e1
L
0.54
0.021
L1
Q
0.40
0 °
3
0.60
8 °
0.016
0 °
0.024
8 °
N
3
21/25
Part numbering
STM1810/1811/1812/1813/1815/1816/1817/1818
7
Part numbering
Table 11.
Ordering information scheme
STM1810
Example:
L
WX
7
F
Device Type
STM181x
Reset Threshold Voltage
STM1810 - 1813:
L = V
= 4.50 V to 4.75 V (4.62 V typ)
= 4.25 V to 4.49 V (4.37 V typ)
RST
M = V
RST
STM1815 - 1818:
T = V
S = V
R = V
= 2.98 V to 3.15 V (3.06 V typ)
= 2.80 V to 2.97 V (2.88 V typ)
= 2.47 V to 2.64 V (2.55 V typ)
RST
RST
RST
Package
WX = SOT23-3
Temperature Range
7 = –40 to 105 °C
Shipping Method
F = ECOPACK Package, Tape & Reel
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.
22/25
STM1810/1811/1812/1813/1815/1816/1817/1818
Part numbering
Table 12.
Marking description
(1)
Part Number
Reset Threshold
Output
Topside Marking
STM1810L
STM1810M
STM1811L
STM1811M
STM1812L
STM1812M
STM1813L
STM1813M
STM1815T
STM1815S
STM1815R
STM1816T
STM1816S
STM1816R
STM1817T
STM1817S
STM1817R
STM1818T
STM1818S
STM1818R
4.62 V
4.37 V
4.62 V
4.37 V
4.62 V
4.37 V
4.62 V
4.37 V
3.06 V
2.88 V
2.55 V
3.06 V
2.88 V
2.55 V
3.06 V
2.88 V
2.55 V
3.06 V
2.88 V
2.55 V
Push-pull RST
Push-pull RST
Open Drain RST
Open Drain RST
Push-pull RST
Push-pull RST
Open Drain RST
Open Drain RST
Push-pull RST
Push-pull RST
Push-pull RST
Open Drain RST
Open Drain RST
Open Drain RST
Push-pull RST
Push-pull RST
Push-pull RST
Open Drain RST
Open Drain RST
Open Drain RST
9AAx
9ABx
9AHx
9AJx
9AQx
9ARx
9AXx
9AYx
9BGx
9BHx
9BJx
9BPx
9BQx
9BRx
9BWx
9BXx
9BYx
9CDx
9CEx
9CFx
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).
23/25
Revision history
STM1810/1811/1812/1813/1815/1816/1817/1818
8
Revision history
Table 13.
Date
Document revision history
Revision
Changes
26-Aug-04
05-Oct-04
1.0
2.0
First Issue.
Update reset characteristics, add typical graphs, remove SC70
references (Figure , 2, 4, 7, 11, 12, 14, 15, 16, 17, 18, 19, 20; and 21,
Table 9, 11, and 12).
19-Nov-04
07-Dec-04
29-Jun-05
3.0
4.0
5.0
Update dimensions (Table 10).
Remove some voltage options (Table 1, 10, 11, and 12).
Temperature range change (Figure 14, 15, 16, and 19; Table 8, 9, and
11).
11-Oct-05
6.0
7
Update typical operating characteristics, Lead-free text (Figure 14, 15,
16, 17, 18, 19, and 20; Table 11, and 12).
28-Aug-2007
Document reformatted.
Update Table 12.
24/25
STM1810/1811/1812/1813/1815/1816/1817/1818
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