1 ? motorola, inc. 1999
features ? precision v cc monitor for 3.0v, 3.3v, and 5.0v supplies ? 140msec guaranteed minimum reset , reset output duration ? reset output guaranteed to v cc = 1.0v (max809) ? low 17 m a supply current ? v cc transient immunity ? small sot23 package ? no external components ? wide operating temperature: 40 c to 85 c typical applications ? computers ? embedded systems ? battery powered equipment ? critical m p power supply monitoring the max809 and max810 are costeffective system supervisor circuits 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 20 m sec of v cc falling through the reset voltage threshold. reset is main- tained active for a minimum of 140msec after v cc rises above the reset threshold. the max810 has an activehigh reset output while the max809 has an activelow reset output. the output of the max809 is guaranteed valid down to v cc = 1v. both devices are available in a sot23 package. the max809/810 are optimized to reject fast transient glitches on the v cc line. low supply current of 17 m a (v cc = 3.3v) makes these devices suitable for battery powered applications. this document contains information on a product under development. motorola reserves the right to change or discontinue this product without notice. l 4.63 m 4.38 j* 4.00 t 3.08 s 2.93 r 2.63 sot23 plastic package (to236) case 31808 ordering information max809x sot23 suffix reset v cc threshold (v) max810x sot23 note: the oxo denotes a suffix for v cc threshold see table below note: *j version is available for max809 only motorola semiconductor components order number: max809/d rev. 0, 06/1999
max809 max810 home page http://scgtomorrow.motorola.com 2 v cc v cc v cc processor reset reset input max809 gnd gnd typical operating circuit 3 1 2 v cc gnd reset (reset)** sot23* note: *sot23 is equivalent to jedec (to236) ** reset is for max809 ** reset is for max810 top view pin configuration absolute maximum ratings* symbol parameter value unit supply voltage (v cc to gnd) 6.0 v reset , reset 0.3 to (v cc + 0.3) v input current, v cc 20 ma output current, reset , reset 20 ma dv/dt (v cc ) 100 v/ m sec p d power dissipation (t a 70 c) sot23 (derate 4mw/ c above +70 c) 230 mw t a operating temperature range 40 to +85 c t stg storage temperature range 65 to +150 c t sol lead temperature (soldering, 10 seconds) +260 c * maximum ratings are those values beyond which damage to the device may occur.
max809 max810 home page http://scgtomorrow.motorola.com 3 electrical characteristics (v cc = full range, t a = 40 c to +85 c unless otherwise noted . typical values are at t a = +25c, v cc = 5v for l/m/j, 3.3v for t/s, 3.0v for r) (note 1.) symbol characteristic min typ max unit v cc range t a = 0 c to +70 c t a = 40 c to +85 c 1.0 1.2 e e 5.5 5.5 v i cc supply current max8xxl/m/j: v cc < 5.5v max8xxr/s/t: v cc < 3.6v e e 24 17 60 50 m a v th reset threshold (note no tag) max8xxl: t a = 25 c t a = 40 c to +85 c max8xxm: t a = 25 c t a = 40 c to +85 c max809j: t a = 25 c t a = 40 c to +85 c max8xxt: t a = 25 c t a = 40 c to +85 c max8xxs: t a = 25 c t a = 40 c to +85 c max8xxr: t a = 25 c t a = 40 c to +85 c 4.56 4.50 4.31 4.25 3.93 3.89 3.04 3.00 2.89 2.85 2.59 2.55 4.63 e 4.38 e 4.00 e 3.08 e 2.93 e 2.63 e 4.70 4.75 4.45 4.50 4.06 4.10 3.11 3.15 2.96 3.00 2.66 2.70 v reset threshold temperature coefficient e 30 e ppm/ c v cc to reset delay v cc = v th to (v th 100mv) e 20 e m sec reset active timeout period 140 240 560 msec v ol reset output voltage low (max809) max809r/s/t: v cc = v th min, i sink = 1.2ma max809l/m/j: v cc = v th min, i sink = 3.2ma v cc > 1.0v, i sink = 50 m a e e e e e e 0.3 0.4 0.3 v v oh reset output voltage high (max809) max809r/s/t: v cc > v th max, i source = 500 m a max809l/m/j: v cc > v th max, i source = 800 m a 0.8 v cc v cc 1.5 e e e e v v ol reset output voltage low (max810) max810r/s/t: v cc = v th max, i sink = 1.2ma MAX810L/m/j: v cc = v th max, i sink = 3.2ma e e e e 0.3 0.4 v v oh reset output voltage high (max810) 1.8 < v cc < v th min, i source = 150 m a 0.8 v cc e e v 1. 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 (max809) reset output remains low while v cc is below the reset voltage threshold, and for 240msec (typ.) after v cc rises above reset threshold 2 reset (max810) reset output remains high while v cc is below the reset voltage threshold, and for 240msec (typ.) after v cc rises above reset threshold 3 v cc supply voltage (typ.)
max809 max810 home page http://scgtomorrow.motorola.com 4 applications information v cc transient rejection the max809/810 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 1 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 power down. transient immunity can be improved by adding a capacitor in close proximity to the v cc pin of the max809/810. figure 1. maximum transient duration vs. overdrive for glitch rejection at 25 c duration v th overdrive v cc t a = +25 c max8xxl/m/j 1 10 100 1000 0 90 160 240 320 400 maximum transient duration ( sec) reset comparator overdrive, (v th v cc (mv) max8xxr/s/t reset signal integrity during powerdown the max809 reset output is valid to v cc = 1.0v. below this voltage the output becomes an oopen circuito and does not sink current. this means cmos logic in- puts to the m p will be floating at an undetermined volt- age. most digital systems are completely shutdown well above this voltage. however, in situations where re- set must be maintained valid to v cc = 0v, a pulldown resistor must be connected from reset to ground to discharge stray capacitances and hold the output low (figure 2). this resistor value, though not critical, should be chosen such that it does not appreciably load reset under normal operation (100k will be suitable for most applications). similarly, a pullup resistor to v cc is required for the max810 to ensure a valid high reset for v cc below 1.0v. v cc v cc reset r1 100 k max809 gnd figure 2. ensuring reset valid to v cc = 0 v processors with bidirectional i/o pins some m p's (such as motorola 68hc11) have bi directional 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 4.7k resistor in series with the output of the max809/810 (figure 3). if there are other components in the system which require a reset signal, they should be buffered 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 47 k figure 3. interfacing to bidirectional reset i/o reset v cc buffered reset to other system components buffer
max809 max810 home page http://scgtomorrow.motorola.com 5 typical characteristics v cc = 5 v v cc = 3 v v cc = 1 v temperature (c ) 40 20 0 20 40 60 85 0 5 10 15 20 25 30 35 supply current ( a) figure 4. supply current vs temperature (no load, max8xxr/s/t) v cc = 5 v v cc = 3 v v cc = 1 v 40 20 0 20 40 60 85 0 5 10 15 20 30 temperature (c ) figure 5. supply current vs temperature (no load, max8xxl/m/j/) v od = vth v cc v od = 10 mv v od = 10 mv temperature (c ) 40 20 0 20 40 60 85 0 40 20 60 80 100 powerdown reset delay ( sec) figure 6. powerdown reset delay vs temperature and overdrive (max8xxr/s/t) v od = 100 mv v od = 200 mv v od = vth v cc v od = 20 mv temperature (c ) 40 20 0 20 40 60 85 0 40 20 60 80 140 powerdown reset delay ( sec) figure 7. powerdown reset delay vs temperature and overdrive (max8xxl/m/j) v od = 100 mv v od = 200 mv 100 120 v od = 10 mv temperature (c ) 40 20 0 20 40 85 0.997 0.998 0.999 1.003 normalized threshold 1.001 1.002 figure 8. powerup reset timeout vs temperature temperature (c ) 40 20 0 20 40 60 85 225 235 230 240 245 250 powerup reset timeout (msec) max8xxl/m/j max8xxr/s/t 60 supply current ( a) 25 figure 9. normalized reset threshold vs temperature 1.000
max809 max810 home page http://scgtomorrow.motorola.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 sot23 1234 max809l j1 max809m j2 max809t j3 max809s j4 max809r j5 max809j j6 max809 marking MAX810L k1 max810m k2 max810t k3 max810s k4 max810r k5 max810 marking 1 2 3 4 + + date code
max809 max810 home page http://scgtomorrow.motorola.com 7 outline 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 max810 home page http://scgtomorrow.motorola.com 8 motorola reserves the right to make changes without further notice to any products herein. motorola makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does motorola 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 consequential or incidental damages. atypicalo parameters which may be provided in motorola 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. motorola does not convey any license under its patent rights nor the rights of others. motorola 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 motorola product could create a situation where personal injury or death may occur. should buyer purchase or use motorola products for any such unintended or unauthorized application, buyer shall indemnify and hold motorola 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 unauthorized use, even if such claim alleges that motorola was negligent regarding the design or manufacture of the part. motorola and are registered trademarks of motorola, inc. motorola, inc. is an equal opportunity/affirmative action employer. mfax is a trademark of motorola, inc. how to reach us: usa / europe / locations not listed : motorola literature distribution; japan : motorola japan ltd.; spd, strategic planning office, 141, p.o. box 5405, denver, colorado 80217. 13036752140 or 18004412447 4321 nishigotanda, shinagawaku, tokyo, japan. 81354878488 customer focus center: 18005216274 mfax ? : rmfax0@email.sps.mot.com touchtone 1 6022446609 asia / pacific : motorola semiconductors h.k. ltd.; silicon harbour centre, motorola fax back system us & canada only 18007741848 2, dai king street, tai po industrial estate, tai po, n.t., hong kong. http://sps.motorola.com/mfax/ 85226629298 home page : http://motorola.com/sps/ max809/d ?
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