rev. b ADM809/adm810 microprocessor supervisory circuit in 3-lead sc70 and sot-23 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. 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 companies. one technology way, p.o. box 9106, norwood, ma 02062-9106, u.s.a. tel: 781/329-4700 www.analog.com fax: 781/326-8703 ? 2003 analog devices, inc. all rights reserved. features superior upgrade for max809/max810 specified over temperature low power consumption (17 a) precision voltage monitor: 2.5 v, 3 v, 3.3 v, 5 v options reset assertion down to 1 v v cc 140 ms min power-on reset logic low reset output (ADM809) logic high reset output (adm810) sc70 and sot-23 packages applications microprocessor systems computers controllers intelligent instruments automotive systems functional block diagram v ref v cc reset generator 240ms ADM809/adm810 reset (reset) gnd general description the ADM809/adm810 supervisory circuits monitor the power supply voltage in microprocessor systems. they provide a reset output during power-up, power-down, and brownout condi tions. on power-up, an internal timer holds reset asserted for 240 ms. this holds the microprocessor in a reset state until conditions have stabilized. the reset output remains operational with v cc as low as 1 v. the ADM809 provides an active low reset signal ( reset ), while the adm810 provides an active high signal (reset) output. seven reset threshold voltage options are available, suitable for monitoring a variety of supply voltages. refer to table i. the reset comparator features built-in glitch immunity, making it immune to fast transients on v cc . the ADM809/adm810 consumes only 17 a, making it suitable for low power portable equipment. it is packaged in 3-lead sc70 and sot-23 packages. reset reset input gnd gnd v cc v cc p system ADM809 v cc figure 1. typical operating circuit
rev. b e2e ADM809/adm810especifications (v cc = full operating range, t a = t min to t max , v cc typ = 5 v for l/m/j, 3.3 v for t/s, 3 v for r models, 2.5 v for z models, unless otherwise noted.) parameter min typ max unit test conditions/comments v cc operating voltage range 1.0 5.5 v t a = 0 c to 70 c 1.2 5.5 v t a = e40 c to +125 c supply current 24 35 av cc < 5.5 v, adm8_l/m/j, t a = e40 c to +85 c 17 30 av cc < 3.6 v, adm8_r/s/t/z, t a = e40 c to +85 c 60 av cc < 5.5 v, adm8_l/m/j, t a = 85 c to 125 c 60 av cc < 3.6 v, adm8_r/s/t/z, t a = 85 c to 125 c reset threshold reset voltage threshold adm8_l 4.56 4.63 4.70 v t a = 25 c adm8_l 4.50 4.75 v t a = e40 c to +85 c adm8_l 4.44 4.82 v t a = e40 c to +125 c adm8_m 4.31 4.38 4.45 v t a = 25 c adm8_m 4.25 4.50 v t a = e40 c to +85 c adm8_m 4.20 4.56 v t a = e40 c to +125 c adm8_j 3.93 4.00 4.06 v t a = 25 c adm8_j 3.89 4.10 v t a = e40 c to +85 c adm8_j 3.80 4.20 v t a = e40 c to +125 c adm8_t 3.04 3.08 3.11 v t a = 25 c adm8_t 3.00 3.15 v t a = e40 c to +85 c adm8_t 2.95 3.21 v t a = e40 c to +125 c adm8_s 2.89 2.93 2.96 v t a = 25 c adm8_s 2.85 3.00 v t a = e40 c to +85 c adm8_s 2.81 3.05 v t a = e40 c to +125 c adm8_r 2.59 2.63 2.66 v t a = 25 c adm8_r 2.55 2.70 v t a = e40 c to +85 c adm8_r 2.52 2.74 v t a = e40 c to +125 c adm8_z 2.28 2.32 2.35 v t a = 25 c adm8_z 2.25 2.38 v t a = e40 c to +85 c adm8_z 2.22 2.42 v t a = e40 c to +125 c reset threshold temperature coefficient 30 ppm/ c v cc to reset delay 20 sv cc = v th to (v th e 100 mv) reset active timeout period 140 240 460 ms t a = e40 c to +85 c 100 840 ms t a = 85 c to 125 c reset output voltage low (ADM809) 0.3 v v cc = v th min, i sink = 1.2 ma, ADM809r/s/t/z 0.4 v v cc = v th min, i sink = 3.2 ma, ADM809l/m/j, 0.3 v v cc >1.0 v, i sink = 50 a reset output voltage high (ADM809) 0.8 v cc vv cc > v th max, i source = 500 a, ADM809r/s/t/z v cc e 1.5 v v cc > v th max, i source = 800 a, ADM809l/m/j reset output voltage low (adm810) 0.3 v v cc = v th min, i sink = 1.2 ma, adm810r/s/t/z 0.4 v v cc = v th min, i sink = 3.2 ma, adm810l/m/j reset output voltage high (adm810) 0.8 v cc v 1.8 v < v cc < v th m in, i source = 150 a specifications subject to change without notice.
rev. b ADM809/adm810 ? caution esd (electrostatic discharge) sensitive device. electrostatic charges as high as 4000 v readily accumulate on the human body and test equipment and can discharge without detection. although the ADM809/adm810 features proprietary esd protection circuitry, permanent damage may occur on devices subjected to high energy electrostatic discharges. therefore, proper esd precautions are recommended to avoid performance degradation or loss of functionality. absolute maximum ratings * (t a = 25 c, unless otherwise noted.) v cc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ?.3 v to +6 v reset, reset . . . . . . . . . . . . . . . . . . ?.3 v to v cc + 0.5 v input current v cc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 ma output current reset, reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 ma rate of rise, v cc . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 v/ s ja thermal impedance, sc70 . . . . . . . . . . . . . . . . . 146 c/w ja thermal impedance, sot-23 . . . . . . . . . . . . . . . 270 c/w lead temperature (soldering, 10 sec) . . . . . . . . . . . . . 300 c vapor phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . . . 215 c infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 220 c storage temperature range . . . . . . . . . . . . ?5 c to +150 c * stresses above those listed under absolute maximum ratings may cause perma- nent damage to the device. this is a stress rating only; functional operation of the device at these or any other conditions above those listed in the operational sections of this specification is not implied. exposure to absolute maximum ratings for extended periods of time may affect device reliability. pin configuration 1 2 top view (not to scale) ADM809/ adm810 gnd 3 reset, reset v cc v cc reset t 1 t 1 v ref v ref v ref v ref t 1 = reset time = 240ms typ v ref = reset voltage threshold figure 2. power fail reset timing table i. reset threshold options reset model threshold (v) ADM809l 4.63 ADM809m 4.38 ADM809j 4.00 ADM809t 3.08 ADM809s 2.93 ADM809r 2.63 ADM809z 2.32 adm810l 4.63 adm810m 4.38 adm810j 4.00 adm810t 3.08 adm810s 2.93 adm810r 2.63 adm810z 2.32 pin function descriptions pin no. mnemonic function 1g nd 0 v. ground reference for all signals. 2 reset (ADM809) active low logic output. reset remains low while v cc is below the reset thresh- old and remains low for 240 ms (typ) after v cc rises above the reset threshold. 2 reset (adm810) active high logic output. reset remains high while v cc is below the reset thresh- old and remains high for 240 ms (typ) after v cc rises above the reset threshold. 3v cc supply voltage being monitored
rev. b e4e ADM809/adm810 ordering guide model reset threshold (v) temperature range brand info quantity package type ADM809lart-reel 4.63 e40 c to +125 c 9lxx 10 k 3-lead sot-23 ADM809lart-reel-7 4.63 e40 c to +125 c 9lxx 3 k 3-lead sot-23 ADM809laks-reel 4.63 e40 c to +125 c m9a 10 k 3-lead sc70 ADM809laks-reel-7 4.63 e40 c to +125 c m9a 3 k 3-lead sc70 ADM809mart-reel 4.38 e40 c to +125 c 9mxx 10 k 3-lead sot-23 ADM809mart-reel-7 4.38 e40 c to +125 c 9mxx 3 k 3-lead sot-23 ADM809maks-reel 4.38 e40 c to +125 cm 9b 10 k 3-lead sc70 ADM809maks-reel-7 4.38 e40 c to +125 cm 9b 3 k 3-lead sc70 ADM809jart-reel 4.00 e40 c to +125 c9 jxx 10 k 3-lead sot-23 ADM809jart-reel-7 4.00 e40 c to +125 c9 jxx 3 k 3-lead sot-23 ADM809jaks-reel 4.00 e40 c to +125 c m9c 10 k 3-lead sc70 ADM809jaks-reel-7 4.00 e40 c to +125 c m9c 3 k 3-lead sc70 ADM809tart-reel 3.08 e40 c to +125 c 9txx 10 k 3-lead sot-23 ADM809tart-reel-7 3.08 e40 c to +125 c 9txx 3 k 3-lead sot-23 ADM809taks-reel 3.08 e40 c to +125 c m9d 10 k 3-lead sc70 ADM809taks-reel-7 3.08 e40 c to +125 c m9d 3 k 3-lead sc70 ADM809sart-reel 2.93 e40 c to +125 c 9sxx 10 k 3-lead sot-23 ADM809sart-reel-7 2.93 e40 c to +125 c 9sxx 3 k 3-lead sot-23 ADM809saks-reel 2.93 e40 c to +125 c m9e 10 k 3-lead sc70 ADM809saks-reel-7 2.93 e40 c to +125 c m9e 3 k 3-lead sc70 ADM809rart-reel 2.63 e40 c to +125 c 9rxx 10 k 3-lead sot-23 ADM809rart-reel-7 2.63 e40 c to +125 c 9rxx 3 k 3-lead sot-23 ADM809raks-reel 2.63 e40 c to +125 c m9f 10 k 3-lead sc70 ADM809raks-reel-7 2.63 e40 c to +125 c m9f 3 k 3-lead sc70 ADM809zart-reel 2.32 e40 c to +125 c 9zxx 10 k 3-lead sot-23 ADM809zart-reel-7 2.32 e40 c to +125 c 9zxx 3 k 3-lead sot-23 ADM809zaks-reel 2.32 e40 c to +125 c m9g 10 k 3-lead sc-70 ADM809zaks-reel-7 2.32 e40 c to +125 c m9g 3 k 3-lead sc-70 adm810lart-reel 4.63 e40 c to +125 c 9lxx 10 k 3-lead sot-23 adm810lart-reel-7 4.63 e40 c to +125 c 9lxx 3 k 3-lead sot-23 adm810laks-reel 4.63 e40 c to +125 c maa 10 k 3-lead sc70 adm810laks-reel-7 4.63 e40 c to +125 c maa 3 k 3-lead sc70 adm810mart-reel 4.38 e40 c to +125 c 9mxx 10 k 3-lead sot-23 adm810mart-reel-7 4.38 e40 c to +125 c 9mxx 3 k 3-lead sot-23 adm810maks-reel 4.38 e40 c to +125 c mab 10 k 3-lead sc70 adm810maks-reel-7 4.38 e40 c to +125 c mab 3 k 3-lead sc70 adm810jart-reel 4.00 e40 c to +125 c9 jxx 10 k 3-lead sot-23 adm810jart-reel-7 4.00 e40 c to +125 c9 jxx 3 k 3-lead sot-23 adm810jaks-reel 4.00 e40 c to +125 c mac 10 k 3-lead sc70 adm810jaks-reel-7 4.00 e40 c to +125 c mac 3 k 3-lead sc70 adm810tart-reel 3.08 e40 c to +125 c 9txx 10 k 3-lead sot-23 adm810tart-reel-7 3.08 e40 c to +125 c 9txx 3 k 3-lead sot-23 adm810taks-reel 3.08 e40 c to +125 c mad 10 k 3-lead sc70 adm810taks-reel-7 3.08 e40 c to +125 c mad 3 k 3-lead sc70 adm810sart-reel 2.93 e40 c to +125 c 9sxx 10 k 3-lead sot-23 adm810sart-reel-7 2.93 e40 c to +125 c 9sxx 3 k 3-lead sot-23 adm810saks-reel 2.93 e40 c to +125 c mae 10 k 3-lead sc70 adm810saks-reel-7 2.93 e40 c to +125 c mae 3 k 3-lead sc70 adm810rart-reel 2.63 e40 c to +125 c 9rxx 10 k 3-lead sot-23 adm810rart-reel-7 2.63 e40 c to +125 c 9rxx 3 k 3-lead sot-23 adm810raks-reel 2.63 e40 c to +125 cm af 10 k 3-lead sc70 adm810raks-reel-7 2.63 e40 c to +125 cm af 3 k 3-lead sc70 adm810zart-reel 2.32 e40 c to +125 c 9zxx 10 k 3-lead sot-23 adm810zart-reel-7 2.32 e40 c to +125 c 9zxx 3 k 3-lead sot-23 adm810zaks-reel 2.32 e40 c to +125 c mag 10 k 3-lead sc70 adm810zaks-reel-7 2.32 e40 c to +125 c mag 3 k 3-lead sc70
rev. b t ypical performance characteristicseADM809/adm810 e5e temperature e c 30 0 e40 e20 020406080 25 20 15 10 5 85 v cc = 5v v cc = 3v supply current e a tpc 1. supply current vs. temperature (no load) temperature e c 235.0 e40 e20 020406080 235.5 236.0 236.5 237.0 237.5 238.0 238.5 239.0 239.5 240.0 85 power-down reset e s tpc 4. power-down reset delay vs. temperature adm8_r adm8_l/m/j 400 350 0 11 0 1000 100 300 250 50 200 150 100 adm8_r/s/t/z reset comparator overdrive, (v th e v cc ) e mv maximum transient duration e s tpc 7. maximum transient duration without causing a reset pulse vs. reset comparator overdrive temperature e c 0 e40 e20 020406080 20 40 60 80 100 120 140 160 180 200 85 v od = v th e v cc v od = 20mv v od = 100mv v od = 200mv v od = 10mv power-down reset e s tpc 2. power-down reset delay vs. temperature adm8_l/m/j temperature e c 0.9990 e40 e20 0204 06080 1.0020 1.0015 1.0010 1.0005 1.0000 0.9995 85 normalized reset threshold tpc 5. normalized reset voltage threshold vs. temperature temperature e c 0 e40 e20 020406080 20 40 60 80 100 120 140 160 180 85 v od = v th e v cc v od = 20mv v od = 100mv v od = 200mv v od = 10mv power-down reset e s tpc 3. power-down reset delay vs. temperature adm8_t/s/r/z 2 1 1 reset output voltage ADM809r ADM809t ch1 2.00v 2.00v m 200ms ch1 2.00v t t ch2 supply voltage 5v p-p tpc 6. reset output voltage vs. supply voltage
rev. b e6e ADM809/adm810 interfacing to other devices output the ADM809/adm810 series is designed to integrate with as many devices as possible and therefore has a standard output dependent on v cc . this enables the part to be used in both 3 v and 5 v or any nominal voltage within the minimum and maxi- mum specifications for v cc . because of this design approach, interfacing this device to other devices is simplified. ensuring a valid reset output down to v cc = 0 v when v cc falls below 0.8 v, the ADM809?s reset no longer sinks current. a high impedance cmos logic input connected to reset may therefore drift to undetermined logic levels. to eliminate this problem, a 100 k resistor should be connected from reset to ground. v cc v cc gnd reset ADM809 figure 3. ensuring a valid reset output down to v cc = 0 v benefits of a very accurate reset threshold in other microprocessor supervisory circuits, tolerances in sup- ply voltages lead to an overall increase in reset tolerance levels due to the deterioration of the microprocessor reset circuit?s power supply. the possibility of a malfunction during a power failure is greatly reduced because the ADM809 and adm810 series can operate effectively even when there are large degradations of the supply voltages. another advantage of the ADM809 and adm810 series is its very accurate internal voltage reference circuit. these benefits combine to produce an exceptionally reliable voltage monitor circuit. interfacing to microprocessors with multiple interrupts in a number of cases it is necessary to interface many interrupts from different devices (e.g., thermal, attitude, and velocity sen- sors). the ADM809 and adm810 can easily be integrated into existing interrupt-handling circuits (figure 4) or be used as a standalone device. priority encoder 74ls147 4-line bcd to p v cc ADM809 gnd reset other sensing devices v cc figure 4. interfacing to microprocessors with multiple interrupts
rev. b ADM809/adm810 e7e outline dimensions 3-lead plastic surface-mount package [sot-23] (rt-3) dimensions shown in millimeters 3.04 2.90 2.80 pin 1 1.40 1.30 1.20 2.64 2.10 1.90 bsc 1 2 3 seating plane 1.12 0.89 0.10 0.01 0.50 0.30 0.69 ref 0.20 0.08 0.60 0.50 0.40 0.95 bsc compliant to jedec standards to-236ab 3-lead plastic surface-mount package [sc70] (ks-3) dimensions shown in millimeters 0.40 0.25 0.10 max 1.00 0.90 0.70 seating plane 1.10 max 0.22 0.08 0.30 0.10 3 1 2 2.00 bsc pin 1 2.10 bsc 0.65 bsc 1.25 bsc 0.10 coplanarity
rev. b c00091e0e1/03(b) printed in u.s.a. e8e ADM809/adm810 revision history location page 1/03?data sheet changed from rev. a to rev. b. changes to specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 changes to table i . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 changes to ordering guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 changes to tpcs 1e3, and tpc 7 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 updated outline dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 10/02?data sheet changed from rev. 0 to rev. a. addition of sc70 package . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . universal change to general description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 changes to specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 changes to absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 change to table i . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 change to ordering guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 change to tpc 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 updated outline dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
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