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STM1810, STM1811, STM1812, STM1813 STM1815, STM1816, STM1817, STM1818
Low Power Reset Circuit
PRELIMINARY DATA
FEATURES SUMMARY

PRECISION MONITORING OF 3V, 3.3V, AND 5V 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 - 100ms (min) LOW SUPPLY CURRENT - 4uA (typ) GUARANTEED ASSERTION DOWN TO VCC = 1.0V (0C to 105C) FACTORY-TRIMMED RESET THRESHOLDS OF 2.55V, 2.88V, 3.06V, 4.37V, and 4.62V (typ) POWER SUPPLY TRANSIENT IMMUNITY PUSH-BUTTON/MANUAL RESET DETECT (STM1813/1818) OPERATING TEMPERATURE: -40C TO 105C 2.5% RESET THRESHOLD ACCURACY (-40C TO 105C) AVAILABLE IN THE SOT23-3 PACKAGE FULLY COMPATIBLE WITH DS181x AND MXD181x PRODUCTS
Figure 1. Packages
SOT23-3 (WX)
Table 1. Device Options
5V STM1810L/M STM1811L/M STM1812L/M STM1813L/M STM1815T/S/R STM1816T/S/R STM1817T/S/R STM1818T/S/R (1) 3.3V/ 3.0V Active-Low RESET (Push-Pull) (1) Active-Low RESET (Open Drain) Active-High RESET (Push-Pull) Active-Low RESET (Open Drain, Bi-directional, with MR Detect)
Note: 1. Active-low RST with internal pull-up resistor
Rev 5 June 2005 1/20
This is preliminary information on a new product now in development or undergoing evaluation. Details are subject to change without notice.
STM1810/1811/1812/1813/1815/1816/1817/1818
TABLE OF CONTENTS
FEATURES SUMMARY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Figure 1. Packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Table 1. Device Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 SUMMARY DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Figure 2. Table 2. Figure 3. Figure 4. Logic Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Signal Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . SOT23-3 Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Hardware Hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ...... ...... ...... ...... .....4 .....4 .....4 .....5
FUNCTIONAL BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Figure 5. Push-pull Active-Low Output (STM1810/1812/1815/1817) . . . . . . . . . . . . . . . . . . . . . . . . 5 Figure 6. Open Drain, Active-Low Output (STM1811/1816) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 Figure 7. Open Drain, Active-Low Output (Bi-directional, Manual Reset Detect, STM1813/1818). . 5 PIN DESCRIPTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Table 3. Table 4. Table 5. Table 6. STM1810/STM1815. . . . STM1811/STM1816. . . . STM1812/STM1817. . . . STM1813/STM1818. . . . ....... ....... ....... ....... ...... ...... ...... ...... ....... ....... ....... ....... ...... ...... ...... ...... ....... ....... ....... ....... ...... ...... ...... ...... ...... ...... ...... ...... .....6 .....6 .....6 .....6
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Reset Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Push-Button Detect Reset (STM1813/1818) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Interfacing to Bidirectional Microcontrollers (MCU's) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Negative Going VCC Transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Valid RST Output Down to VCC = 0V . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Figure 8. Reset Timing Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Figure 9. Push-Button Manual Reset with MR Detect (STM1813/1818) . . . . . . . . . . . . . . . . . . . . . 8 Figure 10.Manual Reset Timing Diagram, Switch Bounce/Debounce (STM1813/1818). . . . . . . . . . 8 Figure 11.Interfacing MCUs with Bi-Directional Reset Pins (RST, Open Drain, STM1811/1816) . . . 8 Figure 12.Valid Reset (RST) Output Down to VCC = 0V (Push-pull) . . . . . . . . . . . . . . . . . . . . . . . . . 9 Figure 13.Valid Reset (RST) Output Down to VCC = 0V (Push-pull) . . . . . . . . . . . . . . . . . . . . . . . . . 9 TYPICAL OPERATING CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Figure 14.Supply Current vs. Temperature (no load) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 Figure 15.Normalized Reset Time-out Period (trec) vs. Temperature - VOD = VTH - VCC . . . . . . . 10 Figure 16.VCC-to-Reset Output Delay vs. Temperature - VOD = VTH - VCC . . . . . . . . . . . . . . . . . 11 Figure 17.Voltage Output Low vs. ISINK. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Figure 18.Voltage Output High vs. ISOURCE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Figure 19.Normalized Reset Threshold vs. Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 Figure 20.Max Transient Duration NOT Causing Reset Pulse vs. Reset Threshold Overdrive . . . 13
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MAXIMUM RATING. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Table 7. Absolute Maximum Ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 DC AND AC PARAMETERS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Table 8. Operating and AC Measurement Conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Figure 21.AC Testing Input/Output Waveforms. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Table 9. DC and AC Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 PACKAGE MECHANICAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Figure 22.SOT23-3 - 3-lead Small Outline Transistor Package Outline . . . . . . . . . . . . . . . . . . . . . 16 Table 10. SOT23-3 - 3-lead Small Outline Transistor Package Mechanical Data . . . . . . . . . . . . . 16 PART NUMBERING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Table 11. Ordering Information Scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Table 12. Marking Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 REVISION HISTORY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 Table 13. Document Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
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SUMMARY 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 +3.0V/+3.3V (STM1815-STM1818), and +5V (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 1.5s. 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 1.0V (0C to +105C). They also provide a reset comparator designed to ignore fast transients on VCC. Reset thresholds are available between +2.55V and +4.62V 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 -40C to +105C. Figure 4., page 5 shows a typical hardware hookup for STM181x devices to a Microcontroller.
Figure 2. Logic Diagram
VCC
Table 2. Signal Names
VSS RST RST(1) VCC Ground Active-low Reset Output Active-high Reset Output Supply Voltage and Input for Reset Threshold Monitor
STM181x
RST (RST)(1)
Note: 1. For STM1812, STM1817
Figure 3. SOT23-3 Connections
RST (RST) VCC 1 2 3 VSS
AI09649
VSS
AI09648
Note: 1. For STM1812, STM1817
Note: RST for STM1812 and STM1817
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Figure 4. Hardware Hookup
VCC VCC STM181x VCC MCU RESET Input VSS
RST(1) VSS Push-button (2) RESET
AI09652a
Note: 1. RST for STM1812 and STM1817 (see Table 1., Device Options) 2. Only valid for STM1813 and STM1818.
FUNCTIONAL BLOCK DIAGRAMS
Figure 5. Push-pull Active-Low Output (STM1810/1812/1815/1817)
VCC
VRST
COMPARE
trec Generator
RST(1)
AI09651a
Note: 1. RST for STM1812 and STM1817.
Figure 6. Open Drain, Active-Low Output (STM1811/1816)
5.5k VCC VRST COMPARE trec Generator
(1)
RST
AI09672
Note: 1. 5.5k internal pull-up resistor
Figure 7. Open Drain, Active-Low Output (Bi-directional, Manual Reset Detect, STM1813/1818)
5.5k
(1)
Push-button Detect VCC VRST COMPARE trec Generator
RST
AI09673
Note: 1. 5.5k internal pull-up resistor
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STM1810/1811/1812/1813/1815/1816/1817/1818
PIN DESCRIPTIONS
See Figure 2., Logic Diagram and Table 2., Signal Names for a brief overview of the signals connected to this device. 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. 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 5.5k pullup resistor. 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. Active-Low RST Output (Open Drain with internal 5.5k pull-up) with Manual Reset Detect. Pulses low when VCC drops below VRST, or RST is externally pulled low for at least 1.5s. It remains low for tPBRST after VCC rises above the reset threshold, or after the external manual reset is released (see Figure 10., page 8). RST output has an internal 5.5k pull-up resistor. VCC. Supply voltage and input for VRST comparator. VSS. Ground, is the reference for the power supply. It must be connected to the system ground.
Table 3. STM1810/STM1815
Pin 1 2 3 Name RST VCC VSS Active-low Reset Output (Push-pull) Supply Voltage and Input for Reset Threshold Monitor Ground Function
Table 4. STM1811/STM1816
Pin 1 2 3 Name RST VCC VSS Function Active-low Reset Output (Open Drain, with internal 5.5k pull-up resistor) Supply Voltage and Input for Reset Threshold Monitor Ground
Table 5. STM1812/STM1817
Pin 1 2 3 Name RST VCC VSS Active-high Reset Output (Push-pull) Supply Voltage and Input for Reset Threshold Monitor Ground Function
Table 6. STM1813/STM1818
Pin 1 2 3 Name RST VCC VSS Function Active-low Reset Output (Open Drain, with internal 5.5k pull-up) with Push-Button/Manual Reset Detect Supply Voltage and Input for Reset Threshold Monitor Ground
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OPERATION
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 = 1.0V (0 to 105C). 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., page 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 1.5s minimum duration. Push-Button Detect Reset (STM1813/1818) Many systems require push-button reset capability (Figure 9., page 8), allowing the user or external logic circuitry to initiate reset. On the STM1813/ STM1818, a logic low on RST held for greater than 1.5s asserts a reset. RST deasserts following a 100ms minimum reset time-out delay (trec). A manual reset input shorter than 1.5s may release RST without the 100ms 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., page 8 The RST output has an internal 5.5k pull-up resistor. 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. ConnectFigure 8. Reset Timing Diagram
VCC VRST
ing the P supervisor's reset (RST) output directly to the microcontroller's reset (RST) pin allows either device to assert reset (Figure 11., page 8). No external pull-up resistor is required, as it is within the STM1811/STM1816. Negative Going VCC Transients The STM181x are relatively immune to negativetransients (glitches). Figure going VCC 20., page 13 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 0.5V 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 100mV below the reset threshold and lasts 20s or less will not cause a reset pulse. A 0.1F bypass capacitor mounted as close as possible to the VCC pin provides additional transient immunity. Valid RST Output Down to VCC = 0V When VCC falls below 1V, 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 1V. However, in applications where RST output must be valid down to 0V, a pull-down resistor may be added to hold the RST output low (see Figure 12., page 9). This resistor must be large enough to not load the RST output, and still be small enough to pull the output to ground. A 100k resistor is recommended. Note: The same situation applies for the activehigh RST of the STM1810/1812. A 100k pull-up resistor to VCC should be used if RST must remain valid for VCC < 1.0V.
RST
VCC (min)
trec trec
RST
(1)
AI09653
Note: 1. RST for STM1812 and STM1817
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Figure 9. Push-Button Manual Reset with MR Detect (STM1813/1818)
VCC STM1813 STM1818 Reset Monitor VCC 5.5k Micro RESET RST Push-button RESET
VSS
AI09654
Figure 10. Manual Reset Timing Diagram, Switch Bounce/Debounce (STM1813/1818)
VCC
(Open)
tPBRST Switch Bounce
(Closed)
tPBRST
External Push-button RST
AI09655
Figure 11. Interfacing MCUs with Bi-Directional Reset Pins (RST, Open Drain, STM1811/1816)
VCC STM1811 STM1816 VCC 5.5k RST Input VSS VCC MCU
RST VSS
AI09656
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Figure 12. Valid Reset (RST) Output Down to VCC = 0V (Push-pull)
VCC STM1810 STM1815 VCC VCC MCU RST RP(1) RST Input VSS
VSS
AI09657
Note: 1. ~100 k resistor recommended.
Figure 13. Valid Reset (RST) Output Down to VCC = 0V (Push-pull)
VCC STM1812 STM1817 VCC VCC MCU RST RST Input VSS
RP(1)
VSS
AI09658
Note: 1. ~100 k resistor recommended.
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TYPICAL OPERATING CHARACTERISTICS
Note: Typical values are at TA = 25C. Figure 14. Supply Current vs. Temperature (no load)
5
4
Supply Current (A)
3
2
VCC = 1.8V VCC = 3V VCC = 5V
1
0 -40
-20
0
20
40
60
80
100
AI10402
Temperature (C)
Figure 15. Normalized Reset Time-out Period (trec) vs. Temperature - VOD = VTH - VCC
1.07
Normalized Reset Time-out Period (trec)
1.05
1.03
1.01
0.99 -40
-20
0
20
40
60
80
100
AI10403
Temperature (C)
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Figure 16. VCC-to-Reset Output Delay vs. Temperature - VOD = VTH - VCC
3.0
2.5
VCC-to-Reset Output Delay (s)
2.0
1.5
1.0
0.5
0.0 -40
-20
0
20
40
60
80
100
AI10404
Temperature (C)
Figure 17. Voltage Output Low vs. ISINK
0.10
0.08
VOUT (V)
0.06 VCC = 3V 0.04
0.02
0.00 0 1 2 3 4 5 6
AI10406
ISINK (mA)
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Figure 18. Voltage Output High vs. ISOURCE
1.20
1.00
0.80
VOUT / VCC
0.60
VCC = 3V
0.40
0.20
0.00 0.0
1.0
2.0
3.0
4.0
5.0
6.0
AI10407
ISOURCE (mA)
Figure 19. Normalized Reset Threshold vs. Temperature
1.010
Normalized Reset Threshold Voltage
1.005
1.000
0.995
0.990 -40
-20
0
20
40
60
80
100
AI10405
Temperature (C)
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Figure 20. Max Transient Duration NOT Causing Reset Pulse vs. Reset Threshold Overdrive
30
25
Transient Duration (s)
20
15
10
5
0 10 100 1000
AI10408
Reset Threshold Overdrive (mV)
Note: Reset occurs above the line.
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MAXIMUM RATING
Stressing the device above the rating listed in the Absolute Maximum Ratings" table 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 imTable 7. Absolute Maximum Ratings
Symbol TSTG TSLD(1) VIO VCC IO PD Parameter Storage Temperature (VCC Off) Lead Solder Temperature for 10 seconds Input or Output Voltage Supply Voltage Output Current Power Dissipation Value -55 to 150 260 -0.3 to VCC +0.3 -0.3 to 7.0 20 320 Unit C C V V mA mW
plied. 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.
Note: 1. Reflow at peak temperature of 255C to 260C for < 30 seconds (total thermal budget not to exceed 180C for between 90 to 150 seconds).
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, Operating and AC Measurement Conditions. 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 VCC Supply Voltage Ambient Operating Temperature (TA) Input Rise and Fall Times Input Pulse Voltages Input and Output Timing Ref. Voltages STM1810 - 1818 1.0 to 5.5 -40 to 105 5 0.2 to 0.8VCC 0.3 to 0.7VCC Unit V C ns V V
Figure 21. AC Testing Input/Output Waveforms
0.8VCC
0.7VCC 0.3VCC
AI02568
0.2VCC
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Table 9. DC and AC Characteristics
Sym VCC ICC VIH VIL VOH Alternative Description Operating Voltage VCC Supply Current Input High Voltage Input Low Voltage Output High Voltage RST Output Source Current IOH RST Output Source Current Test Condition(1) TA = 0 to +105C TA = -40 to +105C VCC = 3.6V, No load VCC = 5.5V, No load STM1813/1818 only STM1813/1818 only 0 < IOH < 500A VCC VRST (max), Reset not asserted (STM1810/STM1815) VCC VRST (min), Reset asserted (STM1812/STM1817) VCC 2.7V, Reset asserted, VOUT = 0.4V (STM1810/1811/ 1813/1815/1816/1818) VCC 2.7V, Reset not asserted, VOUT = 0.4V, (STM1812/1817) 10 VCC - 0.5 VCC - 0.1 350 350 0.7VCC 0.4 Min 1.0 1.2 4 9 Typ Max 5.5 5.5 10 16 Unit V V A A V V V A A
RST Output Sink Current IOL RST Output Sink Current COUT Output Capacitance(2)
mA
10 10
mA pF V 4.75 4.37 4.49 3.06 3.15 2.88 2.97 2.55 2.64 2 5 200 V V V V V V V V V s ms s 150 5.5 5.5 200 7.5 7.5 ms k k
Reset Thresholds STM181xL STM181xM VRST Reset Threshold STM181xT STM181xS STM181xR tRD trec tPB tPBRST VCC to RST Delay RST Pulse Width Push-button Detect to RST Push-button RST Time-out Internal Pull-up Resistance 25C -40 to 105C 25C -40 to 105C 25C -40 to 105C 25C -40 to 105C 25C -40 to 105C 2.47 2.80 2.98 4.25 4.50 4.62
VCC = (VTH + 100mV) falling to (VTH - 200mV) VCC Rising STM1813/1818 From Rising Edge STM1811/1816 STM1813/1818 100 1.5 100 3.5 3.1
150
Push-Button Reset Detect (STM1813, STM1818)
Note: 1. Valid for Ambient Operating Temperature: TA = -40 to 105C; VCC = 1.2V to 5.5V (except where noted). 2. The STM1811/1813/1816/1818 have an internal pull-up resistor which may sink 1mA of current.
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PACKAGE MECHANICAL
Figure 22. SOT23-3 - 3-lead Small Outline Transistor Package Outline
E E1
B 0.15
M
CAB
A1
1
e e1 D
0.20
M
CAB A
3X
0.10 C C
A2 A
3X b C
L1 L
SOT23-3
C
Note: Drawing is not to scale.
Table 10. SOT23-3 - 3-lead Small Outline Transistor Package Mechanical Data
mm Symbol Typ A A1 A2 b C D E E1 e e1 L L1 N 0.54 0.40 0 3 0.60 8 Min 0.89 0.01 0.88 0.30 0.08 2.80 2.10 1.20 0.89 1.78 Max 1.12 0.10 1.02 0.50 0.20 3.04 2.64 1.40 1.03 2.05 0.021 0.016 0 3 0.024 8 Typ Min 0.035 0.001 0.035 0.012 0.003 0.110 0.083 0.047 0.035 0.070 Max 0.044 0.004 0.042 0.020 0.008 0.120 0.104 0.055 0.041 0.081 inches
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PART NUMBERING
Table 11. Ordering Information Scheme
Example: STM1810 L WX 7 F
Device Type STM181x
Reset Threshold Voltage STM1810 - 1813: L = VRST = 4.50V to 4.75V (4.62 typ) M = VRST = 4.25V to 4.49V (4.37 typ) STM1815 - 1818: T = VRST = 2.98V to 3.15V (3.06 typ) S = VRST = 2.80V to 2.97V (2.88 typ) R = VRST = 2.47V to 2.64V (2.55 typ)
Package WX = SOT23-3
Temperature Range 7 = -40 to 105C
Shipping Method F = Pb-Free Package, Tape & Reel
Note: 1. 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.
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Table 12. Marking Description
Part Number STM1810L STM1810M STM1811L STM1811M STM1812L STM1812M STM1813L STM1813M STM1815T STM1815S STM1815R STM1816T STM1816S STM1816R STM1817T STM1817S STM1817R STM1818T STM1818S STM1818R Reset Threshold 4.62V 4.37V 4.62V 4.37V 4.62V 4.37V 4.62V 4.37V 3.06V 2.88V 2.55V 3.06V 2.88V 2.55V 3.06V 2.88V 2.55V 3.06V 2.88V 2.55V Output 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 Topside Marking
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REVISION HISTORY
Table 13. Document Revision History
Date 26-Aug-04 05-Oct-04 19-Nov-04 07-Dec-04 29-Jun-05 Revision 1.0 2.0 3.0 4.0 5 First Issue Update reset characteristics, add typical graphs, remove SC70 references (Figure 1, 2, 4, 7, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20; Table 9, 11, 12) Update dimensions (Table 10) Remove some voltage options (Table 1, 9, 11, 12) Temperature range change (Figure 14, 15, 16, 19; Table 8, 9, 11) Revision Details
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Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners (c) 2005 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com
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