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 (0°C to 105°C) 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: –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 Figure 1. Packages SOT23-3 (WX) Table 1. Device Options 5V STM1810L/M ✔ STM1811L/M ✔ STM1812L/M ✔ STM1813L/M ✔ 3.3V/ 3.0V Active-Low RESET (Push-Pull) Active-Low RESET (Open Drain) Active-High RESET (Push-Pull) Active-Low RESET (Open Drain, Bi-directional, with MR Detect) ✔ ✔(1) ✔ ✔ STM1815T/S/R ✔ STM1816T/S/R ✔ STM1817T/S/R ✔ STM1818T/S/R ✔ ✔ ✔(1) ✔ ✔ 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 2/20 STM1810/1811/1812/1813/1815/1816/1817/1818 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 3/20 STM1810/1811/1812/1813/1815/1816/1817/1818 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 1.5µs. 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 (0°C to +105°C). 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 –40°C to +105°C. Figure 4., page 5 shows a typical hardware hookup for STM181x devices to a Microcontroller. Figure 2. Logic Diagram Table 2. Signal Names VCC STM181x RST (RST)(1) VSS Ground RST Active-low Reset Output RST(1) Active-high Reset Output VCC Supply Voltage and Input for Reset Threshold Monitor Note: 1. For STM1812, STM1817 Figure 3. SOT23-3 Connections VSS AI09648 RST (RST) VCC 1 2 3 VSS AI09649 Note: 1. For STM1812, STM1817 4/20 Note: RST for STM1812 and STM1817 STM1810/1811/1812/1813/1815/1816/1817/1818 Figure 4. Hardware Hookup VCC VCC VCC STM181x MCU RST(1) Push-button (2) RESET VSS RESET Input VSS 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) (1) 5.5kΩ VCC VRST COMPARE trec Generator RST AI09672 Note: 1. 5.5kΩ internal pull-up resistor Figure 7. Open Drain, Active-Low Output (Bi-directional, Manual Reset Detect, STM1813/1818) (1) Push-button Detect VCC VRST COMPARE 5.5kΩ RST trec Generator AI09673 Note: 1. 5.5kΩ internal pull-up resistor 5/20 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 5.5kΩ 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 5.5kΩ pull-up) with Manual Reset Detect. Pulses low when VCC drops below VRST, or RST is externally pulled low for at least 1.5µs. 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 5.5kΩ 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 Name Function 1 RST Active-low Reset Output (Push-pull) 2 VCC Supply Voltage and Input for Reset Threshold Monitor 3 VSS Ground Table 4. STM1811/STM1816 Pin Name Function 1 RST Active-low Reset Output (Open Drain, with internal 5.5kΩ pull-up resistor) 2 VCC Supply Voltage and Input for Reset Threshold Monitor 3 VSS Ground Table 5. STM1812/STM1817 Pin Name Function 1 RST Active-high Reset Output (Push-pull) 2 VCC Supply Voltage and Input for Reset Threshold Monitor 3 VSS Ground Table 6. STM1813/STM1818 Pin Name 1 RST Active-low Reset Output (Open Drain, with internal 5.5kΩ pull-up) with Push-Button/Manual Reset Detect 2 VCC Supply Voltage and Input for Reset Threshold Monitor 3 VSS Ground 6/20 Function STM1810/1811/1812/1813/1815/1816/1817/1818 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 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., 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 1.5µs 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 1.5µs asserts a reset. RST deasserts following a 100ms minimum reset time-out delay (trec). A manual reset input shorter than 1.5µs 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 5.5kΩ 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. Connect- ing the µP 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 20µs or less will not cause a reset pulse. A 0.1µF 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 100kΩ resistor is recommended. Note: The same situation applies for the activehigh RST of the STM1810/1812. A 100kΩ pull-up resistor to VCC should be used if RST must remain valid for VCC < 1.0V. Figure 8. Reset Timing Diagram VCC RST VRST VCC (min) trec trec (1) RST AI09653 Note: 1. RST for STM1812 and STM1817 7/20 STM1810/1811/1812/1813/1815/1816/1817/1818 Figure 9. Push-Button Manual Reset with MR Detect (STM1813/1818) VCC VCC STM1813 STM1818 5.5kΩ Reset Monitor Micro RESET RST Push-button RESET VSS AI09654 Figure 10. Manual Reset Timing Diagram, Switch Bounce/Debounce (STM1813/1818) VCC tPBRST tPBRST (Open) Switch Bounce External Push-button (Closed) RST AI09655 Figure 11. Interfacing MCUs with Bi-Directional Reset Pins (RST, Open Drain, STM1811/1816) VCC STM1811 STM1816 VCC VCC 5.5kΩ RST VSS MCU RST Input VSS AI09656 8/20 STM1810/1811/1812/1813/1815/1816/1817/1818 Figure 12. Valid Reset (RST) Output Down to VCC = 0V (Push-pull) VCC VCC STM1810 STM1815 VCC MCU RST Input RST RP(1) VSS VSS AI09657 Note: 1. ~100 kΩ resistor recommended. Figure 13. Valid Reset (RST) Output Down to VCC = 0V (Push-pull) VCC VCC STM1812 STM1817 VCC RP(1) MCU RST VSS RST Input VSS AI09658 Note: 1. ~100 kΩ resistor recommended. 9/20 STM1810/1811/1812/1813/1815/1816/1817/1818 TYPICAL OPERATING CHARACTERISTICS Note: Typical values are at TA = 25°C. Figure 14. Supply Current vs. Temperature (no load) 5 Supply Current (µA) 4 3 2 VCC = 1.8V VCC = 3V VCC = 5V 1 0 –40 –20 0 20 40 60 80 100 Temperature (˚C) AI10402 Figure 15. Normalized Reset Time-out Period (trec) vs. Temperature - VOD = VTH – VCC Normalized Reset Time-out Period (trec) 1.07 1.05 1.03 1.01 0.99 –40 –20 0 20 40 Temperature (°C) 10/20 60 80 100 AI10403 STM1810/1811/1812/1813/1815/1816/1817/1818 Figure 16. VCC-to-Reset Output Delay vs. Temperature - VOD = VTH – VCC 3.0 VCC-to-Reset Output Delay (µs) 2.5 2.0 1.5 1.0 0.5 0.0 –40 –20 0 20 40 60 80 Temperature (°C) 100 AI10404 Figure 17. Voltage Output Low vs. ISINK 0.10 VOUT (V) 0.08 0.06 VCC = 3V 0.04 0.02 0.00 0 1 2 3 ISINK (mA) 4 5 6 AI10406 11/20 STM1810/1811/1812/1813/1815/1816/1817/1818 Figure 18. Voltage Output High vs. ISOURCE 1.20 1.00 VOUT / VCC 0.80 VCC = 3V 0.60 0.40 0.20 0.00 0.0 1.0 2.0 3.0 4.0 5.0 6.0 ISOURCE (mA) AI10407 Figure 19. Normalized Reset Threshold vs. Temperature Normalized Reset Threshold Voltage 1.010 1.005 1.000 0.995 0.990 –40 –20 0 20 40 Temperature (°C) 12/20 60 80 100 AI10405 STM1810/1811/1812/1813/1815/1816/1817/1818 Figure 20. Max Transient Duration NOT Causing Reset Pulse vs. Reset Threshold Overdrive 30 Transient Duration (µs) 25 20 15 10 5 0 10 100 Reset Threshold Overdrive (mV) 1000 AI10408 Note: Reset occurs above the line. 13/20 STM1810/1811/1812/1813/1815/1816/1817/1818 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 im- 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. Table 7. Absolute Maximum Ratings Symbol TSTG TSLD(1) Parameter Storage Temperature (VCC Off) Lead Solder Temperature for 10 seconds Value Unit –55 to 150 °C 260 °C –0.3 to VCC +0.3 V VIO Input or Output Voltage VCC Supply Voltage –0.3 to 7.0 V IO Output Current 20 mA PD Power Dissipation 320 mW Note: 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). 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 STM1810 - 1818 Unit VCC Supply Voltage 1.0 to 5.5 V Ambient Operating Temperature (TA) –40 to 105 °C ≤5 ns Input Pulse Voltages 0.2 to 0.8VCC V Input and Output Timing Ref. Voltages 0.3 to 0.7VCC V Input Rise and Fall Times Figure 21. AC Testing Input/Output Waveforms 0.8VCC 0.2VCC 0.7VCC 0.3VCC AI02568 14/20 STM1810/1811/1812/1813/1815/1816/1817/1818 Table 9. DC and AC Characteristics Sym Alternative Description Test Condition(1) Min TA = 0 to +105°C TA = –40 to +105°C VCC Operating Voltage ICC VCC Supply Current VIH Input High Voltage STM1813/1818 only VIL Input Low Voltage STM1813/1818 only VOH Max Unit 1.0 5.5 V 1.2 5.5 V 4 10 µA 9 16 µA VCC = 3.6V, No load VCC = 5.5V, No load 0 < IOH < 500µA Output High Voltage Typ 0.7VCC V 0.4 VCC – 0.5 V 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 IOH RST Output Sink Current VCC ≥ 2.7V, Reset asserted, VOUT = 0.4V (STM1810/1811/ 1813/1815/1816/1818) 10 mA RST Output Sink Current VCC ≥ 2.7V, Reset not asserted, VOUT = 0.4V, (STM1812/1817) 10 mA IOL Output Capacitance(2) COUT V VCC – 0.1 10 pF 4.75 V Reset Thresholds STM181xL STM181xM VRST Reset Threshold STM181xT STM181xS STM181xR tRD trec 25°C –40 to 105°C 4.62 4.50 25°C –40 to 105°C 4.37 4.25 25°C –40 to 105°C –40 to 105°C VCC to RST Delay RST Pulse Width VCC Rising 4.49 2.98 3.15 2.80 100 V V 2.97 2.55 2.47 V V 2.88 25°C VCC = (VTH + 100mV) falling to (VTH – 200mV) V 3.06 25°C –40 to 105°C V V V 2.64 V 2 5 µs 150 200 ms Push-Button Reset Detect (STM1813, STM1818) tPB tPBRST Push-button Detect to RST Push-button RST Time-out Internal Pull-up Resistance STM1813/1818 1.5 From Rising Edge 100 150 200 µs ms STM1811/1816 3.5 5.5 7.5 kΩ STM1813/1818 3.1 5.5 7.5 kΩ Note: 1. Valid for Ambient Operating Temperature: TA = –40 to 105°C; 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. 15/20 STM1810/1811/1812/1813/1815/1816/1817/1818 PACKAGE MECHANICAL Figure 22. SOT23-3 – 3-lead Small Outline Transistor Package Outline E E1 0.15 B M CAB A1 1 e D e1 0.20 M 3X CAB 3X b A2 0.10 C A C A C θ L1 C L SOT23-3 Note: Drawing is not to scale. Table 10. SOT23-3 – 3-lead Small Outline Transistor Package Mechanical Data mm inches Symbol Typ Min Max A 0.89 A1 Min Max 1.12 0.035 0.044 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 16/20 0.54 Typ 0.021 L1 0.40 0.60 0.016 0.024 Θ 0° 8° 0° 8° N 3 3 STM1810/1811/1812/1813/1815/1816/1817/1818 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 105°C 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. 17/20 STM1810/1811/1812/1813/1815/1816/1817/1818 Table 12. Marking Description 18/20 Part Number Reset Threshold Output STM1810L 4.62V Push-Pull RST STM1810M 4.37V Push-Pull RST STM1811L 4.62V Open Drain RST STM1811M 4.37V Open Drain RST STM1812L 4.62V Push-Pull RST STM1812M 4.37V Push-Pull RST STM1813L 4.62V Open Drain RST STM1813M 4.37V Open Drain RST STM1815T 3.06V Push-Pull RST STM1815S 2.88V Push-Pull RST STM1815R 2.55V Push-Pull RST STM1816T 3.06V Open Drain RST STM1816S 2.88V Open Drain RST STM1816R 2.55V Open Drain RST STM1817T 3.06V Push-Pull RST STM1817S 2.88V Push-Pull RST STM1817R 2.55V Push-Pull RST STM1818T 3.06V Open Drain RST STM1818S 2.88V Open Drain RST STM1818R 2.55V Open Drain RST Topside Marking STM1810/1811/1812/1813/1815/1816/1817/1818 REVISION HISTORY Table 13. Document Revision History Date Revision Revision Details 26-Aug-04 1.0 First Issue 05-Oct-04 2.0 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) 19-Nov-04 3.0 Update dimensions (Table 10) 07-Dec-04 4.0 Remove some voltage options (Table 1, 9, 11, 12) 29-Jun-05 5 Temperature range change (Figure 14, 15, 16, 19; Table 8, 9, 11) 19/20 STM1810/1811/1812/1813/1815/1816/1817/1818 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. 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