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microprocessor supervisory circuit in 4-lead sot-143 with dsp adm811/adm812 rev. e information furnished by analog devices is believed 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 license 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: 781.329.4700 www.analog.com fax: 781.461.3113 ?2008 analog devices, inc. all rights reserved. features superior upgrade for max811/max812 specified over temperature low power consumption: 5 a typical precision voltage monitor: 2.5 v, 3 v, 3.3 v, 5 v options reset assertion down to 1 v cc power-on reset: 140 ms minimum logic low reset output (adm811) logic high reset output (adm812) built-in manual reset applications microprocessor systems controllers intelligent instruments automotive systems safety systems portable instruments functional block diagram reset generator debounce v ref reset/reset gnd v cc mr adm811/adm812 0 0092-001 figure 1. general description the adm811/adm812 are reliable voltage monitoring devices suitable for use in most voltage monitoring applications. the adm811/adm812 are designed to monitor six different voltages, each allowing a 5% or 10% degradation 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 using 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 detected 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? 0 0092-002 figure 2. typical adm8 11 operating circuit
adm811/adm812 rev. e | page 2 of 12 table of contents 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 descriptions ............................. 5 ? typical performance characteristics ............................................. 6 ? circuit information .......................................................................... 7 ? reset thresholds ...........................................................................7 ? reset output ..................................................................................7 ? manual reset ..................................................................................7 ? glitch immunity ............................................................................7 ? interfacing to other devices ............................................................8 ? output .............................................................................................8 ? benefits of a very accurate reset threshold ............................8 ? ensuring a valid reset /reset output down to v cc = 0 v....8 ? outline dimensions ..........................................................................9 ? ordering guide .......................................................................... 10 ? revision history 5/08rev. d to rev. e changes to table 2 ............................................................................ 4 changes to outline dimensions ..................................................... 9 changes to ordering guide .......................................................... 10 5/06rev. c to rev. d changes to ordering guide ............................................................ 9 2/03rev. b to rev. c changes features .............................................................................. 1 changes to general description .................................................... 1 changes to specifications ................................................................ 2 removed note 2 from ordering guide ......................................... 3 changes to pin function descriptions ........................................... 4 removed note from table i ............................................................ 6 1/03rev. a to rev. b added adm812 ................................................................. universal changes to specifications ................................................................. 2 changes to ordering guide ............................................................. 3 changes to pin configuration ......................................................... 4 changes to pin function description ............................................ 4 additions to table i ........................................................................... 6 changes to manual reset section .................................................... 6 5/02rev. 0 to rev. a deletion of adm812.......................................................... universal
adm811/adm812 rev. e | page 3 of 12 specifications v cc = full operating range; t a = t min to t max ; v cc typical = 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, adm81xl/m, i out = 0 ma 5 10 a v cc < 3.6 v, adm81xr/s/t/z, i out = 0 ma reset voltage threshold adm81xl 4.54 4.63 4.72 v t a = 25c adm81xl 4.50 4.75 v t a = ?40c to +85c adm81xm 4.30 4.38 4.46 v t a = 25c adm81xm 4.25 4.50 v t a = ?40c to +85c adm81xt 3.03 3.08 3.14 v t a = 25c adm81xt 3.00 3.15 v t a = ?40c to +85c adm81xs 2.88 2.93 2.98 v t a = 25c adm81xs 2.85 3.00 v t a = ?40c to +85c adm81xr 2.58 2.63 2.68 v t a = 25c adm81xr 2.55 2.70 v t a = ?40c to +85c adm81xz 2.28 2.32 2.35 v t a = 25c adm81xz 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, adm81xl/m 20 s v od = 125 mv, adm81xr/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 width 10 s glitch immunity 100 ns reset/ reset propagation delay 0.5 s pull-up resistance 10 20 30 k the manual reset circuit acts on an input rising above 2.3 v v cc > v th(max) , adm81xl/m an input falling below 0.8 v v cc > v th(max) , adm81xl/m an input rising above 0.7 v cc v v cc > v th(max) , adm81xr/s/t/z an input falling below 0.25 v cc v v cc > v th(max) , adm81xr/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 cc 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 rev. e | page 4 of 12 absolute maximum ratings typical values are at t a = 25c, unless otherwise noted. table 2. parameter rating terminal voltage (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 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 20 ma output current reset 20 ma power dissipation (t a = 70c) ra-4 (sot-143) 200 mw derate by 4 mw/c above 70c ja thermal impedance 330c/w operating temperature range ?40c to +85c storage temperature range ?65c to +160c lead temperature (soldering, 10 sec) 300c vapor phase (60 sec) 215c infrared (15 sec) 220c esd rating 3 kv
adm811/adm812 rev. e | page 5 of 12 pin configuration and fu nction descriptions 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 threshold 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 rises 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 manual reset. this active low debounced input igno res input pulses of 100 ns or less (typical) and is guaranteed to accept input pulses of greate r 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.
adm811/adm812 rev. e | 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 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 4. supply current vs. temperature (adm81xr/s/t/z) figure 7. supply current vs. temperature (adm81xl/m) 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 00092-005 900 800 700 600 500 400 300 200 100 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 5. power-down reset delay vs. temperature (adm81xr/s/t/z) figure 8. power-down reset delay vs. temperature (adm81xl/m) 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 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 figure 6. power-up reset timeout vs. temperature
adm811/adm812 rev. e | page 7 of 12 circuit information reset thresholds a reset output is provided to the microprocessor whenever the v cc input is below the reset threshold. the actual 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 adm811zart 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 output ( 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 noisy 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 10 s. glitch immunity the adm811/adm812 contain internal filtering circuitry providing glitch immunity from fast 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 rev. e | page 8 of 12 interfacing to other devices output the adm811/adm812 are designed to integrate with as many devices as possible. one feature of the adm811/adm812 is the reset output, which is directly proportional 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 specifications for v cc . benefits of a very accurate 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. another 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 0 0092-011 figure 11. ensuring a valid reset output down to v cc = 0 v ensuring 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 impedance 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.
adm811/adm812 rev. e | page 9 of 12 outline dimensions compliant to jedec standards to-253-aa 073105-a 0.89 0.76 seating plane 0.50 0.30 0.100 0.013 3.04 2.90 2.80 1.07 0.90 0.75 1.92 bsc 0.20 bsc 0.54 ref 12 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 figure 12. 4-lead small outline transistor package [sot-143] (ra-4) dimensions shown in millimeters
adm811/adm812 rev. e | page 10 of 12 ordering guide model 1 reset threshold (v) temperature range ordering quantity package description package option branding adm811lart-reel 4.63 C40c to +85c 10,000 4-lead sot-143 ra-4 mbv adm811lart-reel7 4.63 C40c to +85c 3,000 4-lead sot-143 ra-4 mbv adm811lartz-reel 2 4.63 C40c to +85c 10,000 4-lead sot-143 ra-4 m4j adm811lartz-reel7 2 4.63 C40c to +85c 3,000 4-lead sot-143 ra-4 m4j adm811mart-reel7 4.38 C40c to +85c 3,000 4-lead sot-143 ra-4 mbt adm811martz-reel 2 4.38 C40c to +85c 10,000 4-lead sot-143 ra-4 mbt# adm811martz-reel7 2 4.38 C40c to +85c 3,000 4-lead sot-143 ra-4 mbt# adm811tart-reel 3.08 C40c to +85c 10,000 4-lead sot-143 ra-4 mbg adm811tart-reel7 3.08 C40c to +85c 3,000 4-lead sot-143 ra-4 mbg adm811tartz-reel 2 3.08 C40c to +85c 10,000 4-lead sot-143 ra-4 mbg# adm811tartz-reel7 2 3.08 C40c to +85c 3,000 4-lead sot-143 ra-4 mbg# adm811-3tart-reel7 3.08 C40c to +85c 3,000 4-lead sot-143 ra-4 mb3 adm811-3tartz-rl 2 3.08 C40c to +85c 10,000 4-lead sot-143 ra-4 m4e ADM811-3TARTZ-RL7 2 3.08 C40c to +85c 3,000 4-lead sot-143 ra-4 m4e adm811sart-reel 2.93 C40c to +85c 10,000 4-lead sot-143 ra-4 mbe adm811sart-reel7 2.93 C40c to +85c 3,000 4-lead sot-143 ra-4 mbe adm811sartz-reel 2 2.93 C40c to +85c 10,000 4-lead sot-143 ra-4 mbe# adm811sartz-reel7 2 2.93 C40c to +85c 3,000 4-lead sot-143 ra-4 mbe# adm811rart-reel7 2.63 C40c to +85c 3,000 4-lead sot-143 ra-4 mbb adm811rartz-reel 2 2.63 C40c to +85c 10,000 4-lead sot-143 ra-4 m4n adm811rartz-reel7 2 2.63 C40c to +85c 3,000 4-lead sot-143 ra-4 m4n adm811zart-reel 2.32 C40c to +85c 10,000 4-lead sot-143 ra-4 mbz adm811zart-reel7 2.32 C40c to +85c 3,000 4-lead sot-143 ra-4 mbz adm811zartz-reel 2 2.32 C40c to +85c 10,000 4-lead sot-143 ra-4 m6g adm811zartz-reel7 2 2.32 C40c to +85c 3,000 4-lead sot-143 ra-4 m6g adm812lart-reel 4.63 C40c to +85c 10,000 4-lead sot-143 ra-4 mcv adm812lart-reel7 4.63 C40c to +85c 3,000 4-lead sot-143 ra-4 mcv adm812lartz-reel 2 4.63 C40c to +85c 10,000 4-lead sot-143 ra-4 m5d adm812lartz-reel7 2 4.63 C40c to +85c 3,000 4-lead sot-143 ra-4 m5d adm812mart-reel 4.38 C40c to +85c 10,000 4-lead sot-143 ra-4 mct adm812mart-reel7 4.38 C40c to +85c 3,000 4-lead sot-143 ra-4 mct adm812martz-reel 2 4.38 C40c to +85c 10,000 4-lead sot-143 ra-4 m6d adm812martz-reel7 2 4.38 C40c to +85c 3,000 4-lead sot-143 ra-4 m6d adm812tart-reel7 3.08 C40c to +85c 3,000 4-lead sot-143 ra-4 mcg adm812tartz-reel 2 3.08 C40c to +85c 10,000 4-lead sot-143 ra-4 m68 adm812tartz-reel7 2 3.08 C40c to +85c 3,000 4-lead sot-143 ra-4 m68 adm812sart-reel 2.93 C40c to +85c 10,000 4-lead sot-143 ra-4 mce adm812sart-reel7 2.93 C40c to +85c 3,000 4-lead sot-143 ra-4 mce adm812sartz-reel 2 2.93 C40c to +85c 10,000 4-lead sot-143 ra-4 m67 adm812sartz-reel7 2 2.93 C40c to +85c 3,000 4-lead sot-143 ra-4 m67 adm812rart-reel 2.63 C40c to +85c 10,000 4-lead sot-143 ra-4 mcb adm812rart-reel7 2.63 C40c to +85c 3,000 4-lead sot-143 ra-4 mcb adm812rartz-reel 2 2.63 C40c to +85c 10,000 4-lead sot-143 ra-4 m6f adm812rartz-reel7 2 2.63 C40c to +85c 3,000 4-lead sot-143 ra-4 m6f adm812zart-reel 2.32 C40c to +85c 10,000 4-lead sot-143 ra-4 mcz adm812zart-reel7 2.32 C40c to +85c 3,000 4-lead sot-143 ra-4 mcz adm812zartz-reel 2 2.32 C40c to +85c 10,000 4-lead sot-143 ra-4 m69 adm812zartz-reel7 2 2.32 C40c to +85c 3,000 4-lead sot-143 ra-4 m69 1 only available in reels. 2 z = rohs compliant part, # denotes rohs compliant may be to p or bottom marked.
adm811/adm812 rev. e | page 11 of 12 notes
adm811/adm812 rev. e | page 12 of 12 notes ?2008 analog devices, inc. all rights reserved. trademarks and registered trademarks are the prop erty of their respective owners. d00092-0-5/08(e)

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