STM1818LSWX7F [STMICROELECTRONICS]

Low power reset circuit; 低功耗复位电路
STM1818LSWX7F
型号: STM1818LSWX7F
厂家: ST    ST
描述:

Low power reset circuit
低功耗复位电路

复位电路
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 kpull-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 kinternal 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 kinternal 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 kpull-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 kpull-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 kpull-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 kpull-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 kpull-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 kpull-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 kresistor is recommended.  
Note:  
The same situation applies for the active-high RST of the STM1810/1812. A 100 kpull-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 kresistor 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 kresistor 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  
Please Read Carefully:  
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25/25  

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