? semiconductor components industries, llc, 2001 february, 2001 rev. 6 1 publication order number: max809/d max809 very low supply current 3-pin microprocessor reset monitors the max809 is a costeffective system supervisor circuit designed to monitor v cc in digital systems and provide a reset signal to the host processor when necessary. no external components are required. the reset output is driven active within 10 m sec of v cc falling through the reset voltage threshold. reset is maintained active for a minimum of 140 msec after v cc rises above the reset threshold. the max809 has an activelow reset output. the output of the max809 is guaranteed valid down to v cc = 1.0 v. this device is available in a sot23 package. the max809 is optimized to reject fast transient glitches on the v cc line. low supply current of 1.0 m a (v cc = 3.2 v) make this device suitable for battery powered applications. features ? precision v cc monitor for 2.5 v, 3.0 v, 3.3 v, and 5.0 v supplies ? precision monitoring voltages from 1.6 v to 4.9 v available in 100 mv steps ? 140 msec guaranteed minimum reset output duration ? reset output guaranteed to v cc = 1.0 v ? low 1.0 m a supply current ? v cc transient immunity ? small sot23 package ? no external components ? wide operating temperature: 40 c to 105 c typical applications ? computers ? embedded systems ? battery powered equipment ? critical m p power supply monitoring v cc v cc v cc processor reset reset input max809 gnd gnd figure 1. typical application diagram sot23 (to236) case 318 http://onsemi.com device package shipping ordering information max809xtr sot23 3000/tape & reel pin configuration 3 1 2 v cc gnd reset sot23* note: *sot23 is equivalent to jedec (to236) (top view) see general marking information in the device marking section on page 6 of this data sheet. device marking information xxx = specific device code m = monthly date code marking diagram 3 1 2 xxxm 1 2 3 note: the axo and axxxo denotes a suffix for v cc voltage threshold options see page 6 for more details. max809snxxxt1 sot23 3000/tape & reel
max809 http://onsemi.com 2 absolute maximum ratings* (notes 1.) rating symbol value unit supply voltage (v cc to gnd) v cc 6.0 v reset 0.3 to (v cc + 0.3) v input current, v cc 20 ma output current, reset 20 ma dv/dt (v cc ) 100 v/ m sec power dissipation (t a 70 c) sot23 (derate 4.0 mw/ c above +70 c) p d 230 mw operating temperature range t a 40 to +105 c storage temperature range t stg 65 to +150 c lead temperature (soldering, 10 seconds) t sol +260 c latchup performance: positive negative i latchup 200 200 ma *maximum ratings are those values beyond which damage to the device may occur. 1. this device series contains esd protection and exceeds the following tests: human body model 2000 v per milstd883, method 3015. machine model method 350 v. electrical characteristics t a = 40 c to +105 c unless otherwise noted. typical values are at t a = +25 c. (note 2.) characteristic symbol min typ max unit v cc range t a = 0 c to +70 c t a = 40 c to +105 c 1.0 1.2 5.5 5.5 v supply current v cc = 3.3 v t a = 40 c to +85 c t a = 85 c to +105 c v cc = 5.5 v t a = 40 c to +85 c t a = 85 c to +105 c i cc 0.5 0.8 1.2 2.0 1.8 2.5 m a reset threshold (note 3.) v th v max809sn490 t a = +25 c t a = 40 c to +85 c t a = +85 c to +105 c 4.83 4.78 4.66 4.9 4.97 5.02 5.14 max809sn463 t a = +25 c t a = 40 c to +85 c t a = +85 c to +105 c 4.56 4.50 4.40 4.63 4.70 4.75 4.86 max809sn438 t a = +25 c t a = 40 c to +85 c t a = +85 c to +105 c 4.31 4.25 4.16 4.38 4.45 4.50 4.56 max809sn400 t a = +25 c t a = 40 c to +85 c t a = +85 c to +105 c 3.93 3.89 3.80 4.00 4.06 4.10 4.20 max809sn308 t a = +25 c t a = 40 c to +85 c t a = +85 c to +105 c 3.04 3.00 2.92 3.08 3.11 3.15 3.23 2. production testing done at t a = 25 c, over temperature limits guaranteed by design. 3. contact your on semiconductor sales representative for other threshold voltage options.
max809 http://onsemi.com 3 electrical characteristics (continued) t a = 40 c to +105 c unless otherwise noted. typical values are at t a = +25 c. (note 4.) characteristic symbol min typ max unit reset threshold (continued) v th v max809sn293 t a = +25 c t a = 40 c to +85 c t a = +85 c to +105 c 2.89 2.85 2.78 2.93 2.96 3.00 3.08 max809sn263 t a = +25 c t a = 40 c to +85 c t a = +85 c to +105 c 2.59 2.55 2.50 2.63 2.66 2.70 2.76 max809sn232 t a = +25 c t a = 40 c to +85 c t a = +85 c to +105 c 2.28 2.25 2.21 2.32 2.35 2.38 2.45 max809sn160 t a = +25 c t a = 40 c to +85 c t a = +85 c to +105 c 1.58 1.56 1.52 1.6 1.62 1.64 1.68 reset temperature coefficient 30 ppm/ c v cc to reset delay v cc = v th to (v th 100 mv) 10 m sec reset active timeout period 140 240 460 msec reset output voltage low v cc = v th 0.2 v 1.6 v v th 2.0 v, i sink = 0.5 ma 2.1 v v th 4.0 v, i sink = 1.2 ma 4.1 v v th 4.9 v, i sink = 3.2 ma v ol 0.3 v reset output voltage high v cc = v th + 0.2 v 1.6 v v th 2.4 v, i source = 200 m a 2.5 v v th 4.9 v, i source = 500 m a v oh 0.8 v cc v 4. production testing done at t a = 25 c, over temperature limits guaranteed by design. pin description pin no. symbol description 1 gnd ground 2 reset reset output remains low while v cc is below the reset voltage threshold, and for 240 msec (typ.) after v cc rises above reset threshold 3 v cc supply voltage (typ.)
max809 http://onsemi.com 4 applications information v cc transient rejection the max809 provides accurate v cc monitoring and reset timing during powerup, powerdown, and brownout/sag conditions, and rejects negativegoing transients (glitches) on the power supply line. figure 2 shows the maximum transient duration vs. maximum negative excursion (overdrive) for glitch rejection. any combination of duration and overdrive which lies under the curve will not generate a reset signal. combinations above the curve are detected as a brownout or powerdown. t ypically, transient that goes 100 mv below the reset threshold and lasts 5 m s or less will not cause a reset pulse. transient immunity can be improved by adding a capacitor in close proximity to the v cc pin of the max809. figure 2. maximum transient duration vs. overdrive for glitch rejection at 25 c duration v th overdrive v cc 10.0 100 80 110.0 60.0 maximum transient duration ( m sec) 20 120 reset comparator overdrive (mv) 0 160.0 v th = 4.9 v 60 40 v th = 3.2 v v th = 1.6 v reset signal integrity during powerdown the max809 reset output is valid to v cc = 1.0 v. below this voltage the output becomes an aopen circuito and does not sink current. this means cmos logic inputs to the m p will be floating at an undetermined voltage. most digital systems are completely shutdown well above this voltage. however, in situations where reset must be maintained valid to v cc = 0 v, a pulldown resistor must be connected from reset to ground to discharge stray capacitances and hold the output low (figure 3). this resistor value, though not critical, should be chosen such that it does not appreciably load reset under normal operation (100 k will be suitable for most applications). v cc v cc reset r1 100 k max809 gnd figure 3. ensuring reset valid to v cc = 0 v processors with bidirectional i/o pins some m p's (such as motorola 68hc11) have bidirectional reset pins. depending on the current drive capability of the processor pin, an indeterminate logic level may result if there is a logic conflict. this can be avoided by adding a 4.7 k resistor in series with the output of the max809 (figure 4). if there are other components in the system which require a reset signal, they should be buf fered so as not to load the reset line. if the other components are required to follow the reset i/o of the m p, the buffer should be connected as shown with the solid line. v cc v cc p reset max809 gnd gnd 4.7 k figure 4. interfacing to bidirectional reset i/o reset v cc buffered reset to other system components buffer
max809 http://onsemi.com 5 typical characteristics 0.90 0.80 0.70 1.00 0.00 0.10 0.20 0.30 0.40 0.50 0.60 1.12 1.10 1.06 1.08 1.04 1.02 0.98 0.992 0.994 0.996 0.998 1.001 1.002 60 0.5 0.90 5.5 0.80 3.5 1.5 supply current in microamp 0.70 supply voltage (v) supply current in microamp 0.5 1.20 1.00 0.80 0.60 2.5 2 1.5 0.40 0.20 0.00 1 3 3.5 5.5 supply voltage (v) temperature ( c) powerdown reset delay ( m s) supply current ( m a) temperature ( c) temperature ( c) normalized powerup reset timeout normalized threshold voltage 1.00 40 40 20 0 20 60 80 40 40 60 20 0 20 80 20 80 40 0 100 120 supply voltage (v) 0.00 0.10 0.20 0.30 0.40 0.50 0.60 2.5 4.5 0.5 5.5 3.5 1.5 2.5 4.5 4 4.5 5 1.00 40 40 20 0 20 60 80 85 c 25 c 40 c 85 c 25 c 40 c 85 c 25 c 40 c v od = 10 mv v od = 20 mv v od = 50 mv v od = 100 mv v od = 150 mv figure 5. supply current vs. supply voltage figure 6. supply current vs. supply voltage figure 7. supply current vs. supply voltage figure 8. powerdown reset delay vs. temperature figure 9. normalized powerup reset vs. temperature figure 10. normalized reset threshold voltage vs. temperature 1.000 0.999 0.997 0.995 0.993 v th = 4.9 v v th = 3.2 v v th = 1.6 v v th = 3.2 v v th = 4.9 v v th = 3.2 v v th = 1.6 v v th = 4.9 v v th = 3.2 v v th = 1.6 v
max809 http://onsemi.com 6 taping form pin 1 user direction of feed component taping orientation for 3l sot23 (jedec236) devices standard reel component orientation (mark right side up) device marking sot23 package carrier width (w) pitch (p) part per full reel reel size 8 mm 4 mm 3000 7 inches tape & reel specifications table marking and threshold information on semicond ctor part # v * description marking (xxxm) on semiconductor part # v th * description marking (xxxm) max809sn160t1 1.60 160m max809sn232t1 2.32 232m max809str 2.93 pushpull reset 293m max809ltr 4.63 463m max809sn490t1 4.90 490m *contact your on semiconductor sales representative for other threshold voltage options.
max809 http://onsemi.com 7 package dimensions sot23 plastic package (to236) case 31808 issue af d j k l a c b s h g v 3 1 2 dim a min max min max millimeters 0.1102 0.1197 2.80 3.04 inches b 0.0472 0.0551 1.20 1.40 c 0.0350 0.0440 0.89 1.11 d 0.0150 0.0200 0.37 0.50 g 0.0701 0.0807 1.78 2.04 h 0.0005 0.0040 0.013 0.100 j 0.0034 0.0070 0.085 0.177 k 0.0140 0.0285 0.35 0.69 l 0.0350 0.0401 0.89 1.02 s 0.0830 0.1039 2.10 2.64 v 0.0177 0.0236 0.45 0.60 notes: 1. dimensioning and tolerancing per ansi y14.5m, 1982. 2. controlling dimension: inch. 3. maximum lead thickness includes lead finish thickness. minimum lead thickness is the minimum thickness of base material.
max809 http://onsemi.com 8 on semiconductor and are trademarks of semiconductor components industries, llc (scillc). scillc reserves the right to make changes without further notice to any products herein. scillc makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does scillc assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. atypicalo parameters which may be provided in scill c data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. all operating parameters, including atypicalso must be validated for each customer application by customer's technical experts. scillc does not convey any license under its patent rights nor the rights of others. scillc products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body , or other applications intended to support or sustain life, or for any other application in which the failure of the scillc product could create a sit uation where personal injury or death may occur. should buyer purchase or use scillc products for any such unintended or unauthorized application, buyer shall indemnify and hold scillc and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthori zed use, even if such claim alleges that scillc was negligent regarding the design or manufacture of the part. scillc is an equal opportunity/affirmative action employer. publication ordering information central/south america: spanish phone : 3033087143 (monfri 8:00am to 5:00pm mst) email : onlitspanish@hibbertco.com tollfree from mexico: dial 018002882872 for access then dial 8662979322 asia/pacific : ldc for on semiconductor asia support phone : 3036752121 (tuefri 9:00am to 1:00pm, hong kong time) toll free from hong kong & singapore: 00180044223781 email : onlitasia@hibbertco.com japan : on semiconductor, japan customer focus center 4321 nishigotanda, shinagawaku, tokyo, japan 1410031 phone : 81357402700 email : r14525@onsemi.com on semiconductor website : http://onsemi.com for additional information, please contact your local sales representative. max809/d north america literature fulfillment : literature distribution center for on semiconductor p.o. box 5163, denver, colorado 80217 usa phone : 3036752175 or 8003443860 toll free usa/canada fax : 3036752176 or 8003443867 toll free usa/canada email : onlit@hibbertco.com fax response line: 3036752167 or 8003443810 toll free usa/canada n. american technical support : 8002829855 toll free usa/canada europe: ldc for on semiconductor european support german phone : (+1) 3033087140 (monfri 2:30pm to 7:00pm cet) email : onlitgerman@hibbertco.com french phone : (+1) 3033087141 (monfri 2:00pm to 7:00pm cet) email : onlitfrench@hibbertco.com english phone : (+1) 3033087142 (monfri 12:00pm to 5:00pm gmt) email : onlit@hibbertco.com european tollfree access*: 0080044223781 *available from germany, france, italy, uk, ireland
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