rev. 0 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 which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of analog devices. a adm809/adm810 one technology way, p.o. box 9106, norwood, ma 02062-9106, u.s.a. tel: 617/329-4700 world wide web site: http://www.analog.com fax: 617/326-8703 ? analog devices, inc., 1997 microprocessor supervisory circuit in 3-pin sot-23 functional block diagram v ref v cc reset generator 240ms adm809/adm810 reset (reset) gnd features superior upgrade for max809/max810 specified over temperature low power consumption (17 m a) precision voltage monitor: +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) applications microprocessor systems computers controllers intelligent instruments automotive systems general description the adm809/adm810 supervisory circuits monitor the power supply voltage in microprocessor systems. they pro- vide a reset output during power-up, power-down and brownout conditions. 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. six 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 m a, making it suitable for low power portable equipment. it is packaged in a 3-pin sot-23 package. reset reset input gnd gnd v cc v cc m p system adm809 v cc figure 1. typical operating circuit
C2C rev. 0 adm809/adm810Cspecifications parameter min typ max units 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 = C40 c to +105 c supply current 24 60 m av cc < 5.5 v, adm8_l/m, t a = C40 c to +85 c 17 50 m av cc < 3.6 v, adm8_r/s/t, t a = C40 c to +85 c 100 m av cc < 5.5 v, adm8_l/m, t a = +85 c to +105 c 100 m av cc < 3.6 v, adm8_r/s/t, t a = +85 c to +105 c reset threshold reset voltage threshold adm8_l 4.56 4.63 4.70 v t a = +25 c adm8_l 4.5 4.75 v t a = C40 c to +85 c adm8_l 4.40 4.86 v t a = +85 c to +105 c adm8_m 4.31 4.38 4.45 v t a = +25 c adm8_m 4.25 4.5 v t a = C40 c to +85 c adm8_m 4.16 4.56 v t a = +85 c to +105 c adm8_ j 3.93 4.00 4.06 v t a = +25 c adm8_ j 3.89 4.10 v t a = C40 c to +85 c adm8_ j 3.80 4.20 v t a = +85 c to +105 c adm8_t 3.04 3.08 3.11 v t a = +25 c adm8_t 3.00 3.15 v t a = C40 c to +85 c adm8_t 2.92 3.23 v t a = +85 c to +105 c adm8_s 2.89 2.93 2.96 v t a = +25 c adm8_s 2.85 3.00 v t a = C40 c to +85 c adm8_s 2.78 3.08 v t a = +85 c to +105 c adm8_r 2.59 2.63 2.66 v t a = +25 c adm8_r 2.55 2.70 v t a = C40 c to +85 c adm8_r 2.50 2.76 v t a = +85 c to +105 c reset threshold temperature coefficient 30 ppm/ c v cc to reset delay 20 m sv cc = v th to (v th C100 mv) reset active timeout period 140 240 560 ms t a = C40 c to +85 c 100 840 ms t a = +85 c to +105 c reset output voltage low (adm809) 0.3 v v cc = v th min, i sink = 1.2 ma, adm809r/s/t 0.4 v v cc = v th min, i sink = 3.2 ma, adm809l/m 0.3 v v cc >1.0 v, i sink = 50 m a reset output voltage high (adm809) 0.8 v cc vv cc > v th max, i source = 500 m a, adm809r/s/t v cc C1.5 v v cc > v th max, i source = 800 m a, adm809l/m reset output voltage low (adm810) 0.3 v v cc = v th min, i sink = 1.2 ma, adm810r/s/t 0.4 v v cc = v th min, i sink = 3.2 ma, adm810l/m reset output voltage high (adm810) 0.8 v cc v 1.8 v < v cc < v th min, i source = 150 m a (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 unless otherwise noted.) absolute maximum ratings* (t a = +25 c unless otherwise noted) v cc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C0.3 v to +6 v reset , reset . . . . . . . . . . . . . . . . . . C0.3 v to vcc + 0.5 v input current v cc . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 ma output current reset , reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 ma rate of rise, v cc . . . . . . . . . . . . . . . . . . . . . . . . . . . . 100 v/ m s power dissipation, rt-3 sot-23 . . . . . . . . . . . . . . . . 320 mw derate by 4 mw/ c above +70 c q ja thermal impedance . . . . . . . . . . . . . . . . . . . . . . . 333 c/w lead temperature (soldering, 10 sec) . . . . . . . . . . . . +300 c vapor phase (60 sec) . . . . . . . . . . . . . . . . . . . . . . . . +215 c infrared (15 sec) . . . . . . . . . . . . . . . . . . . . . . . . . . . . +220 c storage temperature range . . . . . . . . . . . . . C65 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. warning! esd sensitive device 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 recommen ded to avoid performance degradation or loss of functionality.
adm809/adm810 C3C rev. 0 pin function description pin mnemonic function 1 gnd 0 v. ground reference for all sig nals. 2 reset (adm809) active low logic output. reset remains low while v cc is below the reset threshold, 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 threshold, and remains high for 240 ms (typ) after v cc rises above the reset threshold. 3v cc supply voltage being monitored. pin configuration 1 2 top view (not to scale) adm809/ adm810 gnd 3 reset , reset v cc reset , rese t v cc reset t1 t1 v ref v ref v ref v ref t1 = reset time = 240ms typ. v ref = reset voltage threshold figure 2. power fail reset timing table i. reset threshold options reset model threshold adm809lart 4.63 v adm809mart 4.38 v adm809jart 4.00 v adm809tart 3.08 v adm809sart 2.93 v adm809rart 2.63 v adm810lart 4.63 v adm810mart 4.38 v adm810jart 4.00 v adm810tart 3.08 v adm810sart 2.93 v adm810rart 2.63 v ordering guide reset temperature brand model* threshold range information quantity adm809lart-reel 4.63 v C40 c to +105 c 9lxx 10k adm809lart-reel-7 4.63 v C40 c to +105 c 9lxx 3k adm809mart-reel 4.38 v C40 c to +105 c 9mxx 10k adm809mart-reel-7 4.38 v C40 c to +105 c 9mxx 3k adm809jart-reel 4.00 v C40 c to +105 c 9jxx 10k adm809jart-reel-7 4.00 v C40 c to +105 c 9jxx 3k adm809tart-reel 3.08 v C40 c to +105 c 9txx 10k adm809tart-reel-7 3.08 v C40 c to +105 c 9txx 3k adm809sart-reel 2.93 v C40 c to +105 c 9sxx 10k adm809sart-reel-7 2.93 v C40 c to +105 c 9sxx 3k adm809rart-reel 2.63 v C40 c to +105 c 9rxx 10k adm809rart-reel-7 2.63 v C40 c to +105 c 9rxx 3k adm810lart-reel 4.63 v C40 c to +105 c alxx 10k adm810lart-reel-7 4.63 v C40 c to +105 c alxx 3k adm810mart-reel 4.38 v C40 c to +105 c amxx 10k adm810mart-reel-7 4.38 v C40 c to +105 c amxx 3k ADM810JART-REEL 4.00 v C40 c to +105 c ajxx 10k ADM810JART-REEL-7 4.00 v C40 c to +105 c ajxx 3k adm810tart-reel 3.08 v C40 c to +105 c atxx 10k adm810tart-reel-7 3.08 v C40 c to +105 c atxx 3k adm810sart-reel 2.93 v C40 c to +105 c asxx 10k adm810sart-reel-7 2.93 v C40 c to +105 c asxx 3k adm810rart-reel 2.63 v C40 c to +105 c arxx 10k adm810rart-reel-7 2.63 v C40 c to +105 c arxx 3k *only available in reels.
adm809/adm810 C4C rev. 0 temperature ?
adm809/adm810 C5C rev. 0 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 dependant 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, adm809s 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 w resistor should be connected from reset to ground. v cc v cc gnd reset adm809 figure 10. ensuring a valid reset output down to v cc = 0 v the 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 circuits 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 (i.e., thermal, attitude and velocity sen- sors). the adm809 and adm810 can easily be integrated into existing interrupt-handling circuits (figure 11) or used as a stand-alone device. priority encoder 74ls147 4 line bcd to m p v cc adm809 gnd reset other sensing devices v cc figure 11. interfacing to m ps with multiple interrupts
adm809/adm810 C6C rev. 0 outline dimensions dimensions shown in inches and (mm). c3047C12C4/97 printed in u.s.a. surface mount package rt-3 0.1200 (3.048) 0.1102 (2.799) pin 1 0.0550 (1.397) 0.0470 (1.194) 0.0236 (0.599) 0.0177 (0.450) 0.1040 (2.642) 0.0827 (2.101) 0.0413 (1.049) 0.0374 (0.950) 0.0807 (2.050) 0.0701 (1.781) 1 2 3 seating plane 0.0440 (1.118) 0.0320 (0.813) 0.0040 (0.102) 0.0005 (0.013) 0.0210 (0.533) 0.0146 (0.371) 0.027 (0.686) ref 0.0059 (0.150) 0.0034 (0.086) 0.0100 (0.254) 0.0050 (0.127)
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