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microprocessor supervisory circuit in 4 - lead sot - 143 with dsp data sheet adm811 / adm812 rev. g document feedback information furnished by analog devices is belie ved to be accurate and reliable. however, no responsibility is assumed by analog devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. specifications subject to change without notice. no li cense is granted by implication or otherwise under any patent or patent rights of analog devices. trademarks and registered trademarks are the property of their respective owners. one technology way, p.o. box 9106, norwood, ma 02062 - 9106, u.s.a. tel: 78 1.329.4700 ? 2013 analog devices, inc. all rights reserved. technical support www.analog.com f eatures superior upgrade for max811/max812 specified over temperature low power consumption: 5 a typ ical precision voltage monitor: 2.5 v, 3 v, 3.3 v, 5 v options reset assertion down to 1 v cc p ower - on reset : 140 ms min imum logic low reset output (adm811) logic high reset output (adm812) built - in manual reset a pplications microprocessor systems controllers intelligent instruments automotive systems safety systems portable instruments functional block dia gram reset generator debounce v ref reset/reset gnd v cc mr adm811/adm812 00092-001 figure 1. g eneral description the adm811/adm812 are reliable voltage monitoring device s suitable for use in most voltage monitoring applications. the adm811/adm812 are designed to monitor six different voltages, each allowing a 5% or 10% degradat ion of standard psu voltages before a reset occurs. these voltages have been selected for the effective monitoring of 2.5 v, 3 v, 3.3 v, and 5 v supply voltage levels. included in this circuit is a debounced manual reset input. reset can be activated usin g an electrical switch (or an input from another digital device) or by a degradation of the supply voltage. the manual reset function is very useful, especially if the circuit in which the adm811/adm812 are operating enters into a state that can only be de tected by the user. allowing the user to reset a system manually can reduce the damage or danger that could otherwise be caused by an out - of - control or locked system. adm811 gnd v cc mr reset microprocessor system gnd v cc reset 100k? 00092-002 figure 2 . typical adm811 operating circuit
adm811/adm812 data sheet rev. g | page 2 of 12 table of conte nts features .............................................................................................. 1 applications ....................................................................................... 1 functional block diagram .............................................................. 1 general description ......................................................................... 1 revision history ............................................................................... 2 specifications ..................................................................................... 3 absolute maximum ratings ............................................................ 4 esd caution .................................................................................. 4 pin configuration and function descriptio ns ............................. 5 typical performance characteristics ............................................. 6 circuit information .......................................................................... 7 reset thresholds ...........................................................................7 reset output ..................................................................................7 manual reset ..................................................................................7 glitch immunit y ............................................................................7 interfacing to other devices ............................................................8 output .............................................................................................8 benefits of a very a ccurate reset threshold ............................8 ensuring a valid reset /reset output down to v cc = 0 v ....8 outline dimensions ..........................................................................9 ordering guide .......................................................................... 10 revision history 3/13 rev. f to rev. g changes to pin 4 description; table 3 ........................................... 5 updated outline dimensions ......................................................... 9 changes to ordering guide .......................................................... 10 8 /0 9 rev. e to rev. f changes to ordering guide .......................................................... 10 5 /08 rev. d to rev. e changes to table 2 ............................................................................ 4 changes to outline dimensions ..................................................... 9 changes to ordering guide .......................................................... 10 5/06 rev. c to rev. d changes to ordering guide ............................................................ 9 2/03 rev . b to rev . c changes features .............................................................................. 1 changes to g e neral description .................................................... 1 changes to s pecifications ................................................................ 2 removed note 2 from o rdering guide ......................................... 3 changes to pin function descriptions .......................................... 4 removed note from table i ........................................................... 6 1/03 rev . a to rev . b added adm812 ................................................................. universal changes to specifications ................................................................. 2 changes to ordering guide ............................................................. 3 ch anges to pin configuration ......................................................... 4 changes to pin function description ............................................ 4 additions to table i ........................................................................... 6 changes to manual reset section .................................................... 6 5/02 rev . 0 to rev . a deletion of adm812 .......................................................... universal
data sheet adm811/adm812 rev. g | page 3 of 12 specifications v cc = full operating range; t a = t min to t max ; v cc typ ical = 5 v for l/m models , 3.3 v for t/s models , 3 v for r model , 2.5 v for z models, unless otherwise noted. table 1 . parameter min typ max unit test conditions/comments supply voltage 1.0 5.5 v t a = 0c to 70c 1.2 v t a = ? 40c to +85c current 8 15 a v cc < 5.5 v, adm81x l/m, i out = 0 ma 5 10 a v cc < 3.6 v, adm81x r/s/t/z, i out = 0 ma reset voltage threshold adm81x l 4.54 4.63 4.72 v t a = 25c adm81x l 4.50 4.75 v t a = ? 40c to +85 c adm81x m 4.30 4.38 4.46 v t a = 25c adm81x m 4.25 4.50 v t a = ? 40c to +85c adm81x t 3.03 3.08 3.14 v t a = 25c adm81x t 3.00 3.15 v t a = ? 40c to +85c adm81x s 2.88 2.93 2.98 v t a = 25c adm81x s 2.85 3.00 v t a = ? 4 0c to +85c adm81x r 2.58 2.63 2.68 v t a = 25c adm81x r 2.55 2 .70 v t a = ? 40c to +85c adm81x z 2.28 2.32 2.35 v t a = 25c adm81x z 2.25 2.38 v t a = ? 40c to +85c reset threshold temperature coefficient 30 ppm/c v cc to reset/ reset delay 40 s v od = 125 mv, adm81x l/m 20 s v od = 1 25 mv, adm81x r/s/t/z reset active timeout period 140 560 ms v cc = v th(max) 300 700 ms adm811 - 3t only manual reset minimum pulse w idth 10 s glitch immunity 100 ns reset/ reset propagation delay 0.5 s pull - up resistance 10 20 30 k? the ma nual reset circuit acts on an input rising above 2.3 v v cc > v th(max) , adm81x l/m an input falling below 0.8 v v cc > v th(max) , adm81x l/m an input rising above 0.7 v cc v v cc > v th(max) , adm81x r/s/t/z an input falling below 0.25 v cc v v cc > v th(max) , adm81x r/s/t/z reset/ reset output voltage low (adm812r/s/t/z) 0.3 v v cc = v th(max) , i sink = 1.2 ma low (adm812l/m) 0.4 v v cc = v th(max) , i sink = 3.2 ma high (adm812r/s/t/z/l/m) 0.8 v cc v 1.8 v < v cc < v th(min) , i source = 150 a low (adm811r/s/t/z) 0.3 v v cc = v th(min) , i sink = 1.2 ma low (adm811l/m) 0.4 v v cc = v th(min) , i sink = 3.2 ma low (adm811r/s/t/z/l/m) 0.3 v v cc > 1.0 v, i sink = 50 a high (adm811r/s/t/z) 0.8 v c c v v cc > v th(max) , i source = 500 a high (adm811l/m) v cc 1.5 v v cc > v th(max) , i source = 800 a
adm811/adm812 data sheet rev. g | page 4 of 12 absolute maximum rat ings typical values are at t a = 25 c, unless otherwise noted. table 2 . parameter rating terminal volta ge (with respect to ground) v cc ? 0.3 v to +6 v all other inputs ?0.3 v to v cc + 0.3 v input current v cc 20 ma mr 20 ma output current reset 20 ma power dissipation (t a = 70c) r a - 4 (sot - 143) 200 mw derate by 4 mw/c a bove 70c ja thermal impedance 330c/w operating temperature range ?40c to +85c storage temperature range ?65c to +160c lead temperature (soldering, 10 sec) 300 c vapor phase (60 sec) 215 c infrared (15 sec ) 220 c esd rating 3 kv stresses above those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. esd caution
data sheet adm811/adm812 rev. g | page 5 of 12 pin configuration an d function descripti ons adm811/ adm812 top view (not to scale) gnd 1 reset/reset 2 v cc mr 4 3 00092-003 figure 3 . pin configuration table 3 . pin function descriptions pin o. neonic description 1 gnd ground reference for all signals , 0 v. 2 reset (adm811) active low logic output. reset remains low while v cc is below the reset thr eshold or when mr is low; reset then remains low for at least 140 ms (at least 300 ms for the adm811 - 3t) after v cc rise s above the reset threshold. reset (adm812) active high logic output. reset remains high while v cc is below the reset threshold or when mr is low; reset then remains high for 240 ms (typical) after v cc rises above the reset threshold. 3 mr manu al reset. this active low debounced input ignore s input pulses of 100 ns or less (typical) and is guaranteed to accept input pulses of greater than 10 s. leave floating when not used. 4 v cc monitored supply voltage of 2.5 v, 3 v, 3.3 v, or 5 v . a 0.1 f decoupling capacitor between v cc and the gnd pi n is recommended.
adm811/adm812 data sheet rev. g | page 6 of 12 typical performance characteristics 12 0 2 4 6 8 10 ?40 ?20 0 20 30 50 70 85 100 120 temperature (c) i dd (a) i dd @ v cc = 5.5v i dd @ v cc = 3v i dd @ v cc = 1v 00092-004 figure 4 . supply current vs. temperature (adm81 x r/s/t/z) 1000 900 800 700 600 500 400 300 200 100 0 ?40 ?20 0 20 30 50 70 85 100 120 temperature ( c) power-down reset delay (s) v od = 20mv v od = 125mv v od = 200mv 00092-005 figure 5 . power- down reset delay vs. temperature (adm81x r/s/t /z) 299 294 279 274 269 264 259 254 249 244 ?40 ?20 0 20 30 50 70 85 100 120 temperature (c) power-up reset timeout (ms) adm81xl/m adm81xr/s/t/z 00092-006 figure 6 . power- up reset timeout vs. temperature 10 9 8 7 6 5 4 2 3 1 0 ?40 ?20 0 20 30 50 70 85 100 120 temperature (c) i dd (a) i dd @ v cc = 5.5v i dd @ v cc = 3v i dd @ v cc = 1v 00092-007 figure 7 . supply current v s. temperature (adm81x l/m) 900 800 700 600 500 400 300 200 100 0 ?40 ?20 0 20 30 50 70 85 100 120 temperature (c) power-down reset delay (s) v od = 20mv v od = 125mv v od = 200mv 00092-008 figure 8 . power- down reset delay vs. t emperature (adm81x l/m) 1.007 1.006 0.995 0.996 0.997 0.998 0.999 1.000 1.001 1.002 1.002 1.003 1.004 1.005 ?40 ?20 0 20 30 50 70 85 100 120 temperature (c) normalized reset threshold 00092-009 figure 9 . reset threshold deviation vs. temperature
data sheet adm811/adm812 rev. g | page 7 of 12 circuit information reset thresholds a reset output is provided to the microprocessor whenever t he v cc input is below the reset threshold. the actu al reset threshold depends on whether an l, m, t, s, r, or z suffix is used (see table 4 ) . table 4 . reset threshold options model reset threshold (v) adm811lart 4.63 adm811mart 4.38 adm811tart 3.08 adm811 - 3tart 3.08 adm811sart 2.93 adm811rart 2.63 adm811 zart 2.32 adm812lart 4.63 adm812mart 4.38 adm812tart 3.08 ADM812SART 2.93 adm812rart 2.63 adm812zart 2.32 reset output on power - up and after v cc rises above the reset threshold, an internal timer holds the reset output active for 240 ms (typical). this is intended as a power - on reset signal for the processor. it allows time for both the power supply and the microprocessor to stabilize after power - up. if a power supply brownout or interruption occurs, the reset output is similarly activated and remains active for 240 ms (typical) after the supply recovers. this allows time for the power supply and microprocessor to stabilize. the adm811 provides an active low reset outpu t ( reset ) while the adm812 provides an active high output ( reset ). during power - down of the adm811, the reset output remains valid (low) with v cc as low as 1 v. this ensures that the microprocessor is held in a stable shutdown condition as the supply falls and also ensures that no spurious activity can occur via the microprocessor as it powers up. manual reset the adm811/adm812 are equipped with a manual reset input. this input is designed to operate in a nois y environment where unwanted glitches could be induced. these glitches could be produced by the bouncing action of a switch contact, or where a manual reset switch may be located some distance away from the circuit (the cabling of which can pick up noise). the manual reset input is guaranteed to ignore logically valid inputs that are faster than 100 ns and to accept inputs longer in duration than 1 0 s. glitch immunity the adm811/adm812 contain internal filtering circuitry providing glitch immunity from fas t transient glitches on the power supply line. v cc v ref v ref v ref v ref reset t 1 t 1 t 1 = reset time = 250ms typical v ref = reset voltage threshold 00092-010 figure 10 . power fall reset timing
adm811/adm812 data sheet rev. g | page 8 of 12 interfacing to other devices output the adm811/adm812 are designed to integrate with as many devices as possible. one fea ture of the adm811/adm812 is the reset output, which is directly proportiona l to v cc (this is guar - anteed only while v cc is greater than 1 v). this enables the part to be used with both 3 v and 5 v, or any nominal voltage within the minimum and maximum spe cifications for v cc . benefits of a very a ccurate reset threshold because the adm811/adm812 can operate effectively even when there are large degradations of the supply voltages, the possibility of a malfunction during a power failure is greatly reduced. an other advantage of the adm811/adm812 is its very accurate internal voltage reference circuit. combined, these benefits produce an exceptionally reliable microprocessor supervisory circuit. adm811 gnd v cc v cc reset 00092-011 figure 11 . ensuri ng a valid reset output down to v cc = 0 v ens uring a valid reset /reset output down to v cc = 0 v when v cc falls below 0.8 v, the reset /reset of the adm811/ adm812 no longer sinks current. therefore, a high impe dance cmos logic input connected to reset /reset can drift to undetermined logic levels. to eliminate this problem, a 100 k? resistor should be connected from reset /reset to ground.
data sheet adm811/adm812 rev. g | page 9 of 12 outline dimensions compliant t o jedec s t andards t o-253-a a 0.89 0.76 0.50 0.30 0.100 0.013 3.04 2.90 2.80 1.07 0.90 0.75 1.92 bsc 1.72 ref 0.20 bsc 0.54 ref 1 2 3 4 1.40 1.30 1.20 2.64 2.10 8 0 0.60 0.50 0.40 0.20 0.08 1.22 0.80 03-13-2012-b seating plane fig ure 12 . 4 - lead small outline transistor package [sot - 143] (r a - 4) dimensions shown in millimeters
adm811/adm812 data sheet rev. g | page 10 of 12 ordering guide model 1 , 2 reset threshold (v) temperature range ordering quantity package description package option branding ad m811lart - reel 4.63 C 40c to +85c 10,000 4 - lead sot - 143 r a -4 mbv adm811lart - reel7 4.63 C 40c to +85c 3,000 4 - lead sot - 143 r a -4 mbv adm811lartz - reel 4.63 C 40c to +85c 10,000 4 - lead sot - 143 r a -4 m4j adm811lartz - reel7 4.63 C 40c to +85c 3, 000 4 - lead sot - 143 r a -4 m4j adm811mart - reel7 4.38 C 40c to +85c 3,000 4 - lead sot - 143 r a -4 mbt adm811martz - reel 4.38 C 40c to +85c 10,000 4 - lead sot - 143 r a -4 mbt # adm811martz - reel7 4.38 C 40c to +85c 3,000 4 - lead sot - 143 r a -4 mbt # adm811tart - reel7 3.08 C 40c to +85c 3,000 4 - lead sot - 143 r a -4 mbg adm811tartz - reel 3.08 C 40c to +85c 10,000 4 - lead sot - 143 r a -4 mbg # adm811tartz - reel7 3.08 C 40c to +85c 3,000 4 - lead sot - 143 r a - 4 mbg # adm811 - 3tart - reel7 3.08 C 40c to +85c 3,000 4 - lead sot - 143 r a -4 mb3 adm811 - 3tartz - rl 3.08 C 40c to +85c 10,000 4 - lead sot - 143 r a -4 m4e adm811 - 3tartz - rl7 3.08 C 40c to +85c 3,000 4 - lead sot - 143 r a -4 m4e adm811sart - reel 2.93 C 40c to +85c 10,000 4 - lead sot - 143 r a -4 mbe adm811sart - reel7 2.93 C 40c to +85c 3,000 4 - lead sot - 143 r a -4 mbe adm811sartz - reel 2.93 C 40c to +85c 10,000 4 - lead sot - 143 r a -4 mbe # adm811sartz - reel7 2.93 C 40c to +85c 3,000 4 - lead sot - 143 r a -4 mbe # adm811rart - reel7 2.63 C 40c to +85c 3,000 4 - lead so t - 143 r a -4 mbb adm811rartz - reel 2.63 C 40c to +85c 10,000 4 - lead sot - 143 r a -4 m4n adm811rartz - reel7 2.63 C 40c to +85c 3,000 4 - lead sot - 143 r a -4 m4n adm811zart - reel 2.32 C 40c to +85c 10,000 4 - lead sot - 143 r a -4 mbz adm811zart - reel7 2.32 C 40c to +85c 3,000 4 - lead sot - 143 r a -4 mbz adm811zartz - reel 2.32 C 40c to +85c 10,000 4 - lead sot - 143 r a -4 m6g adm811zartz - reel7 2.32 C 40c to +85c 3,000 4 - lead sot - 143 r a -4 m6g adm812lart - reel7 4.63 C 40c to +85c 3,000 4 - lead sot - 143 r a -4 m cv adm812lartz - reel 4.63 C 40c to +85c 10,000 4 - lead sot - 143 r a -4 m5d adm812lartz - reel7 4.63 C 40c to +85c 3,000 4 - lead sot - 143 r a -4 m5d adm812mart - reel 4.38 C 40c to +85c 10,000 4 - lead sot - 143 r a -4 mct adm812mart - reel7 4.38 C 40c to +85 c 3,000 4 - lead sot - 143 r a -4 mct adm812martz - reel 4.38 C 40c to +85c 10,000 4 - lead sot - 143 r a -4 m6d adm812martz - reel7 4.38 C 40c to +85c 3,000 4 - lead sot - 143 r a -4 m6d adm812tart - reel7 3.08 C 40c to +85c 3,000 4 - lead sot - 143 r a -4 mcg adm812t artz - reel 3.08 C 40c to +85c 10,000 4 - lead sot - 143 r a -4 m68 adm812tartz - reel7 3.08 C 40c to +85c 3,000 4 - lead sot - 143 r a -4 m68 ADM812SART - reel 2.93 C 40c to +85c 10,000 4 - lead sot - 143 r a -4 mce ADM812SART - reel7 2.93 C 40c to +85c 3,000 4 -l ead sot - 143 r a -4 mce ADM812SARTz - reel 2.93 C 40c to +85c 10,000 4 - lead sot - 143 r a -4 m67 ADM812SARTz - reel7 2.93 C 40c to +85c 3,000 4 - lead sot - 143 r a -4 m67 adm812rart - reel7 2.63 C 40c to +85c 3,000 4 - lead sot - 143 r a -4 mcb adm812rartz - reel 2. 63 C 40c to +85c 10,000 4 - lead sot - 143 r a -4 m6f adm812rartz - reel7 2.63 C 40c to +85c 3,000 4 - lead sot - 143 r a - 4 m6f adm812zart - reel 2.32 C 40c to +85c 10,000 4 - lead sot - 143 r a -4 mcz adm812zart - reel7 2.32 C 40c to +85c 3,000 4 - lead sot - 143 r a -4 mcz adm812zartz - reel 2.32 C 40c to +85c 10,000 4 - lead sot - 143 r a -4 m69 adm812zartz - reel7 2.32 C 40c to +85c 3,000 4 - lead sot - 143 r a -4 m69 1 available only in reels. 2 z = rohs compliant part. rohs - compliant parts may have # branded o n either the top or bottom of the device.
data sheet adm811/adm812 rev. g | page 11 of 12 notes
adm811/adm812 data sheet rev. g | page 12 of 12 notes ? 2013 analog devices, inc. all rights reserved. trade marks and registered trademarks are the property of their respective owners. d00092 - 0 - 3/13(g)

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