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1/20 preliminary data june 2005 this is preliminary information on a new product now in development or undergoing evaluation. details are subject to change wit hout notice. stm1810, STM1811, stm1812, stm1813 stm1815, stm1816, stm1817, stm1818 low power reset circuit rev 5 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 v cc = 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 table 1. device options note: 1. active-low rst with internal pull-up resistor sot23-3 (wx) 5v 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) stm1810l/m ?? STM1811l/m ? ? (1) stm1812l/m ?? stm1813l/m ? ? stm1815t/s/r ?? stm1816t/s/r ? ? (1) stm1817t/s/r ?? stm1818t/s/r ??
stm1810/1811/1812/ 1813/1815/1816/1817/1818 2/20 table of contents features summary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 figure 1. packages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 table 1. device options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 summary description. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 figure 2. logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 table 2. signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 figure 3. sot23-3 connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 figure 4. hardware hookup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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. stm1810/stm1815. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 table 4. STM1811/stm1816. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 table 5. stm1812/stm1817. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 table 6. stm1813/stm1818. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 reset output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 push-button detect reset (stm1813/1818) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 interfacing to bidirectional microcontrollers (mcu?s) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 negative going v cc transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 valid rst output down to v cc = 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 v cc = 0v (push-pull) . . . . . . . . . . . . . . . . . . . . . . . . . 9 figure 13.valid reset (rst) output down to v cc = 0v (push-pull) . . . . . . . . . . . . . . . . . . . . . . . . . 9 typical operating characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 figure 14.supply current vs. temperature (no load) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 figure 15.normalized reset time-out period (t rec ) vs. temperature - v od = v th ? v cc . . . . . . . 10 figure 16.v cc -to-reset output delay vs. temperature - v od = v th ? v cc . . . . . . . . . . . . . . . . . 11 figure 17.voltage output low vs. i sink. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 figure 18.voltage output high vs. i source. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 figure 19.normalized reset threshold vs. temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 figure 20.max transient duration not causing reset pulse vs. reset threshold overdrive . . . 13
3/20 stm1810/1811/1812/18 13/1815/1816/1817/1818 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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 7 table 12. marking description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 revision history. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19 table 13. document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
stm1810/1811/1812/ 1813/1815/1816/1817/1818 4/20 summary description stm181x devices are low power reset devices used to monitor power supplies for microcontrol- lers. 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 cc has risen above the preset threshold for a minimum period of time (t rec ). they provide excel- lent 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 v cc input for an out-of-tolerance con- dition. when an invalid v cc condition occurs, the reset output (rst ) is forced low (or high in the case of rst) and remains asserted for t rec after v cc rises above the reset threshold. the stm1813/1818 also keep reset asserted for t rec 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 in- ternal pull-up resistor to v cc . the stm1813 and stm1818 feature a debounced manual reset fea- ture 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 fea- ture, the release of the external switch triggers the reset period. the stm181x devices are guaranteed to output the correct logic state for v cc down to 1.0v (0c to +105c). they also provide a reset comparator designed to ignore fast transients on v cc . reset thresholds are available between +2.55v and +4.62v these small, low power devices are ideal for use in portable equipment. all are avail- able 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 note: 1. for stm1812, stm1817 table 2. signal names note: 1. for stm1812, stm1817 figure 3. sot23-3 connections note: rst for stm1812 and stm1817 ai09648 v cc stm181x v ss rst (rst) (1) v ss ground rst active-low reset output rst (1) active-high reset output v cc supply voltage and input for reset threshold monitor ai09649 2 3 1 rst (rst) v ss v cc
5/20 stm1810/1811/1812/18 13/1815/1816/1817/1818 figure 4. hardware hookup 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) note: 1. rst for stm1812 and stm1817. figure 6. open drain, active-low output (STM1811/1816) note: 1. 5.5k ? internal pull-up resistor figure 7. open drain, active-low output (bi-directional, manual reset detect, stm1813/1818) note: 1. 5.5k ? internal pull-up resistor ai09652a v cc v ss v cc mcu stm181x rst (1) v cc v ss reset input push-button reset (2) ai09651a compare v rst v cc t rec generator rst (1) ai09672 compare v rst v cc t rec generator rst 5.5k ? (1) ai09673 compare push-button detect v rst v cc t rec generator rst 5.5k ? (1)
stm1810/1811/1812/ 1813/1815/1816/1817/1818 6/20 pin descriptions see figure 2., logic diagram and table 2., signal names for a brief overview of the signals connect- ed to this device. active-low rst output (push-pull). pulses low when v cc drops below v rst , and stays low as long as v cc is below the reset threshold. it re- mains low for t rec after v cc rises above the reset threshold. active-low rst output (open drain). pulses low when v cc drops below v rst , and stays low as long as v cc is below the reset threshold. it re- mains low for t rec after v cc rises above the reset threshold. rst output has an internal 5.5k ? pull- up resistor. active-high rst output (push-pull). pulses high when v cc drops below v rst , and stays high as long as v cc is below the reset threshold. it re- mains high for t rec after v cc rises above the reset threshold. active-low rst output (open drain with inter- nal 5.5k ? pull-up) with manual reset detect. pulses low when v cc drops below v rst , or rst is externally pulled low for at least 1.5s. it re- mains low for t pbrst after v cc rises above the re- set threshold, or after the external manual reset is released (see figure 10., page 8 ). rst output has an internal 5.5k ? pull-up resistor. v cc . supply voltage and input for v rst compara- tor. v ss . ground, is the reference for the power sup- ply. it must be connected to the system ground. table 3. stm1810/stm1815 table 4. STM1811/stm1816 table 5. stm1812/stm1817 table 6. stm1813/stm1818 pin name function 1rst active-low reset output (push-pull) 2 v cc supply voltage and input for reset threshold monitor 3 v ss ground pin name function 1rst active-low reset output (open drain, with internal 5.5k ? pull-up resistor) 2 v cc supply voltage and input for reset threshold monitor 3 v ss ground pin name function 1 rst active-high reset output (push-pull) 2 v cc supply voltage and input for reset threshold monitor 3 v ss ground pin name function 1rst active-low reset output (open drain, with internal 5.5k ? pull-up) with push-button/manual reset detect 2 v cc supply voltage and input for reset threshold monitor 3 v ss ground
7/20 stm1810/1811/1812/18 13/1815/1816/1817/1818 operation reset output the stm181x asserts a reset signal to the micro- controller (mcu) whenever v cc goes below the reset threshold (v rst ), and is guaranteed valid down to v cc = 1.0v (0 to 105c). a microcontrol- ler?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 v cc exceeds the reset threshold an internal timer keeps rst low for the reset time-out period, t rec . after this interval, rst returns high. if v cc 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 v cc goes below the reset threshold, the internal timer clears. the reset timer starts when v cc returns above the reset threshold. reset t rec 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 (t rec ). 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 de- bounce circuitry. a debounced waveform is shown in figure 10., page 8 the rst output has an inter- nal 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. connect- ing the p supervisor?s reset (rst ) output directly to the microcontroller?s reset (rst ) pin allows ei- ther device to assert reset ( figure 11., page 8 ). no external pull-up resistor is required, as it is within the STM1811/stm1816. negative going v cc transients the stm181x are relatively immune to negative- going v cc transients (glitches). figure 20., page 13 shows typical transient duration ver- sus reset comparator overdrive (for which the stm181x will not generate a reset pulse). the graph was generated using a negative pulse ap- plied to v cc, starting at 0.5v above the actual re- set threshold and ending below it by the magnitude indicated (comparator overdrive). the graph indicates the maximum pulse width a nega- tive v cc transient can have without causing a re- set pulse. as the magnitude of the transient increases (further below the threshold), the maxi- mum allowable pulse width decreases. any com- bination of duration and overdrive which lies under the curve will no t generate a reset signal. typi- cally, a v cc 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 v cc pin pro- vides additional transient immunity. valid rst output down to v cc = 0v when v cc falls below 1v, the rst output no long- er 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 active- high rst of the stm1810/1812. a 100k ? pull-up resistor to v cc should be used if rst must remain valid for v cc < 1.0v. figure 8. reset timing diagram note: 1. rst for stm1812 and stm1817 ai09653 rst rst (1) v cc v rst v cc (min) t rec t rec
stm1810/1811/1812/ 1813/1815/1816/1817/1818 8/20 figure 9. push-button manual reset with mr detect (stm1813/1818) figure 10. manual reset timing diagram, switch bounce/debounce (stm1813/1818) figure 11. interfacing mcus with bi-directional reset pins (rst , open drain, STM1811/1816) ai09654 v cc stm1813 stm1818 rst push-button reset v cc v ss micro reset 5.5k ? reset monitor ai09655 rst v cc external push-button tpbrst (closed) (open) tpbrst switch bounce ai09656 v cc STM1811 stm1816 rst v cc v ss v ss v cc mcu 5.5k ? rst input
9/20 stm1810/1811/1812/18 13/1815/1816/1817/1818 figure 12. valid reset (rst ) output down to v cc = 0v (push-pull) note: 1. ~100 k ? resistor recommended. figure 13. valid reset (rst) output down to v cc = 0v (push-pull) note: 1. ~100 k ? resistor recommended. ai09657 v cc r p (1) stm1810 stm1815 rst v cc v ss v ss v cc mcu rst input ai09658 v cc r p (1) stm1812 stm1817 rst v cc v ss v ss v cc mcu rst input
stm1810/1811/1812/ 1813/1815/1816/1817/1818 10/20 typical operating characteristics note: typical values are at t a = 25c. figure 14. supply current vs. temperature (no load) figure 15. normalized reset time-out period (t rec ) vs. temperature - v od = v th ? v cc temperature (?c) supply current (a) ai10402 0 1 2 3 4 5 ?40 ?20 0 20 40 60 80 100 v cc = 1.8v v cc = 3v v cc = 5v temperature ( c) normalized reset time-out period (t rec ) ai10403 0.99 1.01 1.03 1.05 1.07 ?40 ?20 0 20 40 60 80 100
11/20 stm1810/1811/1812/18 13/1815/1816/1817/1818 figure 16. v cc -to-reset output delay vs. temperature - v od = v th ? v cc figure 17. voltage output low vs. i sink temperature ( c) v cc -to-reset output delay (s) ai10404 0.0 0.5 1.0 1.5 2.0 2.5 3.0 ?40 ?20 0 20 40 60 80 100 0.00 0.02 0.04 0.06 0.08 0.10 0123456 i sink (ma) v out (v) v cc = 3v ai10406
stm1810/1811/1812/ 1813/1815/1816/1817/1818 12/20 figure 18. voltage output high vs. i source figure 19. normalized reset threshold vs. temperature 0.00 0.20 0.40 0.60 0.80 1.00 1.20 0.0 1.0 2.0 3.0 4.0 5.0 6.0 i source (ma) v out / v cc v cc = 3v ai10407 temperature ( c) normalized reset threshold voltage ai10405 0.990 0.995 1.000 1.005 1.010 ?40 ?20 0 20 40 60 80 100
13/20 stm1810/1811/1812/18 13/1815/1816/1817/1818 figure 20. max transient duration not causing reset pulse vs. reset threshold overdrive note: reset occurs above the line. 0 5 10 15 20 25 30 10 100 1000 reset threshold overdrive (mv) transient duration (s) ai10408
stm1810/1811/1812/ 1813/1815/1816/1817/1818 14/20 maximum rating stressing the device above the rating listed in the absolute maximum ratings? table may cause per- manent 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 con- ditions for extended periods may affect device reliability. refer also to the stmicroelectronics sure program and other relevant quality docu- ments. table 7. absolute maximum ratings note: 1. reflow at peak temperature of 255c to 260c for < 30 seconds (total thermal budget not to exceed 180c for between 90 t o 150 seconds). dc and ac parameters this section summarizes the operating measure- ment conditions, and the dc and ac characteris- tics 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 figure 21. ac testing input/output waveforms symbol parameter value unit t stg storage temperature (v cc off) ?55 to 150 c t sld (1) lead solder temperature for 10 seconds 260 c v io input or output voltage ?0.3 to v cc +0.3 v v cc supply voltage ?0.3 to 7.0 v i o output current 20 ma p d power dissipation 320 mw parameter stm1810 - 1818 unit v cc supply voltage 1.0 to 5.5 v ambient operating temperature (t a ) ?40 to 105 c input rise and fall times 5ns input pulse voltages 0.2 to 0.8v cc v input and output timing ref. voltages 0.3 to 0.7v cc v ai02568 0.8v cc 0.2v cc 0.7v cc 0.3v cc
15/20 stm1810/1811/1812/18 13/1815/1816/1817/1818 table 9. dc and ac characteristics note: 1. valid for ambient operating temperature: t a = ?40 to 105c; v cc = 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. sym alter- native description test condition (1) min typ max unit v cc operating voltage t a = 0 to +105c 1.0 5.5 v t a = ?40 to +105c 1.2 5.5 v i cc v cc supply current v cc = 3.6v, no load 410a v cc = 5.5v, no load 916a v ih input high voltage stm1813/1818 only 0.7v cc v v il input low voltage stm1813/1818 only 0.4 v v oh output high voltage 0 < i oh < 500 a v cc ? 0.5 v cc ? 0.1 v i oh rst output source current v cc v rst (max), reset not asserted (stm1810/stm1815) 350 a rst output source current v cc v rst (min), reset asserted (stm1812/stm1817) 350 a i ol rst output sink current v cc 2.7v, reset asserted, v out = 0.4v (stm1810/1811/ 1813/1815/1816/1818) 10 ma rst output sink current v cc 2.7v, reset not asserted, v out = 0.4v, (stm1812/1817) 10 ma c out output capacitance (2) 10 pf reset thresholds v rst reset threshold stm181xl 25c 4.62 v ?40 to 105c 4.50 4.75 v stm181xm 25c 4.37 v ?40 to 105c 4.25 4.49 v stm181xt 25c 3.06 v ?40 to 105c 2.98 3.15 v stm181xs 25c 2.88 v ?40 to 105c 2.80 2.97 v stm181xr 25c 2.55 v ?40 to 105c 2.47 2.64 v t rd v cc to rst delay v cc = (v th + 100mv) falling to (v th ? 200mv) 25s t rec rst pulse width v cc rising 100 150 200 ms push-button reset detect (stm1813, stm1818) t pb push-button detect to rst stm1813/1818 1.5 s t pbrst push-button rst time-out from rising edge 100 150 200 ms internal pull-up resistance STM1811/1816 3.5 5.5 7.5 k ? stm1813/1818 3.1 5.5 7.5 k ?
stm1810/1811/1812/ 1813/1815/1816/1817/1818 16/20 package mechanical figure 22. sot23-3 ? 3-lead small outline transistor package outline note: drawing is not to scale. table 10. sot23-3 ? 3-lead small outline transistor package mechanical data symbol mm inches typ min max typ min max a 0.89 1.12 0.035 0.044 a1 0.01 0.10 0.001 0.004 a2 0.88 1.02 0.035 0.042 b 0.30 0.50 0.012 0.020 c 0.08 0.20 0.003 0.008 d 2.80 3.04 0.110 0.120 e 2.10 2.64 0.083 0.104 e1 1.20 1.40 0.047 0.055 e 0.89 1.03 0.035 0.041 e1 1.78 2.05 0.070 0.081 l 0.54 0.021 l1 0.40 0.60 0.016 0.024 0 8 0 8 n3 3 sot23-3 0.10 c a a2 a1 3x c c l1 l c e1 d e 3x b e m 0.15 cab b e1 a m 0.20 c a b 1
17/20 stm1810/1811/1812/18 13/1815/1816/1817/1818 part numbering table 11. ordering information scheme 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. example: stm1810 l wx 7 f device type stm181x reset threshold voltage stm1810 - 1813: l = v rst = 4.50v to 4.75v (4.62 typ) m = v rst = 4.25v to 4.49v (4.37 typ) stm1815 - 1818: t = v rst = 2.98v to 3.15v (3.06 typ) s = v rst = 2.80v to 2.97v (2.88 typ) r = v rst = 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
stm1810/1811/1812/ 1813/1815/1816/1817/1818 18/20 table 12. marking description part number reset threshold output topside marking 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
19/20 stm1810/1811/1812/18 13/1815/1816/1817/1818 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 )
stm1810/1811/1812/ 1813/1815/1816/1817/1818 20/20 information furnished is believed to be accurate and reliable. however, stmicroelectronics assumes no responsibility for the co nsequences 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 publicati on are subject to change without notice. this publication supersedes and replaces all information previously supplied. stmicroelectronics prod ucts are not authorized for use as critical components in life support devices or systems without express written approval of stmicroelectro nics. the st logo is a registered trademark of stmicroelectronics. all other names are the property of their respective owners ? 2005 stmicroelectronics - all rights reserved stmicroelectronics group of companies australia - belgium - brazil - canada - china - czech republic - finland - france - germany - hong kong - india - israel - ital y - japan - malaysia - malta - morocco - singapore - spain - sweden - switzerland - united kingdom - united states of america www.st.com

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