supervisory circuits with watchdog and manual reset in 5-lead sc70 and sot-23 preliminary technical data adm823/adm824/adm825 rev.prb 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 ri ghts of analog devices. trademarks and registered trademarks are the prop erty 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: 781.326.8703 ? 2004 analog devices, inc. all rights reserved. features precision 2.5 v to 5 v power supply monitor 7 reset threshold options: 2.19 v to 4.63 v 140 ms (min) reset timeout watchdog timer with 1.6s timeout (adm823, adm824) manual reset input (adm823, adm825) push-pull output stages: reset (adm823) reset , reset (adm824/adm825) low power consumption (3 a) guaranteed reset output valid to v cc = 1 v power supply glitch immunity specified over automotive temperature range 5-lead sc70 and sot-23 packages applications microprocessor systems computers controllers intelligent instruments portable equipment functional block diagram adm823 v cc v cc mr gnd wdi reset reset generator watchdog detector debounce v ref 04534-0-001 figure 1. general description the adm823/adm824/adm825 are supervisory circuits which monitor power supply voltage levels and code execution integrity in microprocessor-based systems. as well as providing power on reset signals, an on-chip watchdog timer can reset the microprocessor if it fails to strobe within a preset timeout period. a reset signal can also be asserted by means of an external push-button, through a manual reset input. the three parts feature different combinations of watchdog input, manual reset input and output stage configuration, as shown in table 1. each part is available in a choice of seven reset threshold options ranging from 2.19 v to 4.63 v. the reset and watchdog timeout periods are fixed at 140 ms (min) and 1.6s (typ), respectively. the adm823/adm824/adm825 are available in 5-lead sc70 and sot-23 packages and typically consume only 3 a, making them suitable for use in low power portable applications. table 1. selection table output stage part no. watchdog timer manual reset reset reset adm823 yes yes push-pull C adm824 yes C push-pull push-pull adm825 C yes push-pull push-pull
adm823/adm824/adm825 preliminary technical data rev.prb | page 2 of 10 table of contents specifications..................................................................................... 3 absolute maximum ratings............................................................ 5 esd caution.................................................................................. 5 pin configurations and function descriptions ........................... 6 typical performance characteristics ..............................................7 outline dimensions ...............................................................9 ordering guides......................................................................... 10
preliminary technical data adm823/adm824/adm825 rev.prb | page 3 of 10 specifications v cc = 4.75 v to 5.5 v for adm82_l, v cc = 4.5 v to 5.5 v for adm82_m, v cc = 3.15 v to 3.6 v for adm82_t, v cc = 3 v to 3.6 v for adm82_s, v cc = 2.7 v to 3.6 v for adm82_r, v cc = 2.38 v to 2.75 v for adm82_z, v cc = 2.25 v to 2.75 v for adm82_y, t a = t min to t max , unless otherwise noted table 2. parameter min typ max unit test conditions/comments supply v cc operating voltage range 1 5.5 v t a = 0c to +70c 1.2 v t a = t min to t max supply current 10 24 a wdi and mr unconnected adm82_l/m 5 12 a wdi and mr unconnected adm82_t/s/r/z/y reset threshold voltage adm82_l 4.56 4.63 4.70 v t a = 25c 4.50 4.75 v t a = t min to t max adm82_m 4.31 4.38 4.45 v t a = 25c 4.25 4.50 v t a = t min to t max adm82_t 3.04 3.08 3.11 v t a = 25c 3.00 3.15 v t a = t min to t max adm82_s 2.89 2.93 2.96 v t a = 25c 2.85 3.00 v t a = t min to t max adm82_r 2.59 2.63 2.66 v t a = 25c 2.55 2.70 v t a = t min to t max adm82_z (sc70 only) 2.28 2.32 2.35 v t a = 25c 2.25 2.38 v t a = t min to t max adm82_y (sc70 only) 2.16 2.19 2.22 v t a = 25c 2.13 2.25 v t a = t min to t max reset threshold temperature coefficient 40 ppm/c reset threshold hysteresis 10 mv adm82_l/m 5 mv adm82_t/s/r/z/y reset timeout period 140 200 280 ms v cc to reset delay 40 s v th C v cc = 100 mv reset output voltage 0.4 v v cc = v th min, i sink = 3.2 ma, adm82_l/m 0.3 v v cc = v th min, i sink = 1.2 ma, adm82_t/s/r/z/y 0.3 v t a = 0c to 70c, v cc = 1 v, v cc falling, i sink = 50 a v cc ? 1.5 v v cc = v th max, i source = 120 a, adm82_l/m 0.8 v cc v v cc = v th max, i source = 30 a, adm82_t/s/r/z/y reset output short circuit current 800 a reset = 0 v, v cc = 5.5 v, adm82_l/m 400 a reset = 0 v, v cc = 5.5 v, adm82_t/s/r/z/y reset output voltage 0.4 v v cc = v th max, i sink = 3.2 ma, adm824l/m, adm825l/m 0.3 v v cc = v th max, i sink = 1.2 ma, adm824t/s/r/z/y, adm825t/s/r/z/y 0.8 v cc v v cc > = 1.8 v, i source = 150 a
adm823/adm824/adm825 preliminary technical data rev.prb | page 4 of 10 parameter min typ max unit test conditions/comments watchdog input (adm823, adm824) watchdog timeout period 1.12 1.6 2.40 s wdi pulse width 50 ns v il = 0.4 v, v ih = 0.8 v cc , wdi input threshold v il 0.3 v cc v v ih 0.7 v cc v wdi input current 120 160 a v wdi = v cc , time average ?20 ?15 a v wdi = 0, time average manual reset input (adm823, adm825) mr input threshold 0.3 v cc v 0.7 v cc v mr input pulse width 1 s mr glitch rejection 100 ns mr pull-up resistance 35 52 75 k mr to reset delay 500 ns
preliminary technical data adm823/adm824/adm825 rev.prb | page 5 of 10 absolute maximum ratings t a = 25c, unless otherwise noted. table 3. parameter rating v cc C0.3 v to +6 v output current (reset, reset ) 20 ma operating temperature range C40c to +125c storage temperature range C65c to +150c ja thermal impedance sc70 146c/w sot-23 270c/w lead temperature soldering (10 sec) 300c vapor phase (60 sec) 215c infrared (15 sec) 220c stresses above those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress rating only and 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 esd (electrostatic discharge) sensitive device. electrosta tic charges as high as 4000 v readily accumulate on the human body and test equipment and can discharge with out detection. although this product features proprietary esd protection circuitry, permanent dama ge may occur on devices subjected to high energy electrostatic discharges. therefore, proper esd precautions are recommended to avoid performance degradation or loss of functionality.
adm823/adm824/adm825 preliminary technical data rev.prb | page 6 of 10 pin configurations and function descriptions adm823 top view (not to scale) reset 1 gnd 2 mr 3 v cc wdi 5 4 04534-0-002 figure 2. adm823 pin configuration adm824 top view (not to scale) reset 1 gnd 2 reset 3 v cc wdi 5 4 04534-0-003 figure 3. adm824 pin configuration adm825 top view (not to scale) reset 1 gnd 2 reset 3 v cc mr 5 4 04534-0-004 figure 4. adm825 pin configuration table 4. pin function descriptions pin. no. mnemonic description 1 reset push-pull active-low reset output. asserted whenever v cc is below the reset threshold, v th . 2 gnd ground. 3 mr (adm823) manual reset input. this is an active-low input which, when forced low for at least 1s, generates a reset. it features a 52 k internal pull-up. reset (adm824/adm825) active-high, push-pull reset output. 4 wdi (adm823/adm824) watchdog input. generates a reset if the voltage on the pin remains low or high for the duration of the watchdog timeout. the timer is cleared if a lo gic transition occurs on this pin or if a reset is generated. mr (adm825) manual reset input. 5 v cc power supply voltage being monitored.
preliminary technical data adm823/adm824/adm825 rev.prb | page 7 of 10 typical performance characteristics 04534-0-005 temperature (c) 120 ?40 ?20 0 20 40 60 80 100 i cc ( a) 10.0 9.0 9.5 8.0 7.5 8.5 7.0 6.5 6.0 5.5 5.0 4.5 4.0 3.5 adm823l adm824y adm825r figure 5. supply current vs. temperature 04534-0-006 v cc (v) 5.5 0 2.0 1.5 1.0 0.5 2.5 3.0 3.5 4.0 4.5 5.0 i cc ( a) 80 70 75 60 55 65 50 45 40 35 30 20 10 25 15 5 0 figure 6. supply current vs. supply voltage 04534-0-007 temperature (c) 120 ?40 40 20 0 ?20 60 80 100 normalized reset threshold 1.05 1.03 1.04 1.01 1.00 1.02 0.99 0.98 0.97 0.96 0.95 figure 7. normalized reset threshold vs. temperature 04534-0-008 temperature (c) 120 ?40 40 20 0 ?20 60 80 100 v cc to reset delay ( s) 100 80 90 60 50 70 40 30 20 10 0 figure 8. reset comparator propagation delay vs. temperature (v cc falling) 04534-0-009 temperature (c) 120 ?40 40 20 0 ?20 60 80 100 manual reset to reset delay (ns) 340 300 320 260 240 280 220 200 180 160 140 120 100 figure 9. manual reset to reset propagation delay vs. temperature (adm823/adm825) 04534-0-010 temperature (c) 120 ?40 40 20 0 ?20 60 80 100 reset timeout 250 230 240 210 200 220 190 180 170 figure 10. reset timeout period vs. temperature
adm823/adm824/adm825 preliminary technical data rev.prb | page 8 of 10 04534-0-011 temperature 125 ?40 60 85 25 0 ?20 timeout period (s) 2.0 1.6 1.8 1.4 1.2 0.8 1.0 0.6 0.4 0.2 0 figure 11. watchdog timeout period vs. temperature (adm823/adm824) 04534-0-012 over drive vod (mv) 1000 10 100 maximum transient duration ( s) 160 120 140 100 60 80 40 20 0 v th = 4.9v v th = 2.93v figure 12. maximum v cc transient duration vs. reset threshold overdrive 04534-0-013 temperature (c) 100 ?50 0 50 mr minimum pulse width (ns) 190 160 180 170 150 130 140 120 110 100 figure 13. manual reset minimum pulse width vs. temperature (adm823/adm825) 04534-0-014 temperature (c) 160 ?40 10 110 60 minimum pulse width (ns) 3.8 3.2 3.6 3.4 3.0 2.6 2.8 2.4 2.2 2.0 negative pulse positive pulse figure 14. watchdog input minimu m pulse width vs. temperature (adm823/adm824)
preliminary technical data adm823/adm824/adm825 rev.prb | page 9 of 10 outline dimensions compliant to jedec standards mo-203aa 2.00 bsc 0.30 0.15 0 . 1 0 m a x 1.00 0.90 0.70 seating plane 1.10 max 0.22 0.08 0.46 0.36 0.26 3 54 12 pin 1 2.10 bsc 0.65 bsc 1.25 bsc 0.10 coplanarit y 8 4 0 figure 15. 5-lead plastic surface-mount package [sc-70] (ks-5) dimensions shown in millimeters pin 1 1.60 bsc 2.80 bsc 1.90 bsc 0.95 bsc 1 3 4 5 2 0.22 0.08 10 5 0 0.50 0.30 0.15 max seating plane 1.45 max 1.30 1.15 0.90 2.90 bsc 0.60 0.45 0.30 compliant to jedec standards mo-178aa figure 16. 5-lead small outline transistor package [sot-23] (rj-5) dimensions shown in millimeters
adm823/adm824/adm825 preliminary technical data rev.prb | page 10 of 10 ordering guides table 5. adm823 ordering guide table 6. adm824 ordering guide 1 all of the adm824 models are no nstandard. contact factory for av ailability of nons tandard models. table 7. adm825 ordering guide model reset threshold (v) temperature ra nge quantity package type branding adm823lyks-r7 4.63 ?40c to +125c 3k sc70-5 n07 adm823lyrt-r7 4.63 ?40c to +125c 3k sot-23-5 n07 adm823myks-r7 4.38 ?40c to +125c 3k sc70-5 n07 adm823myrt-r7 4.38 ?40c to +125c 3k sot-23-5 n07 adm823tyks-r7 3.08 ?40c to +125c 3k sc70-5 n07 adm823tyrt-r7 3.08 ?40c to +125c 3k sot-23-5 n07 adm823syks-r7 2.93 ?40c to +125c 3k sc70-5 n07 adm823syrt-r7 2.93 ?40c to +125c 3k sot-23-5 n07 adm823ryks-r7 2.63 ?40c to +125c 3k sc70-5 n07 adm823ryrt-r7 2.63 ?40c to +125c 3k sot-23-5 n07 adm823zyks-r7 2.32 ?40c to +125c 3k sc70-5 n07 adm823yyks-r7 2.19 ?40c to +125c 3k sc70-5 n07 model 1 reset threshold (v) temperature range quantity package type branding adm824lyks-r7 4.63 ?40c to +85c 3k sc70-5 n08 ADM824LYRT-R7 4.63 ?40c to +125c 3k sot-23-5 n08 adm824myks-r7 4.38 ?40c to +85c 3k sc70-5 n08 adm824myrt-r7 4.38 ?40c to +125c 3k sot-23-5 n08 adm824tyks-r7 3.08 ?40c to +85c 3k sc70-5 n08 adm824tyrt-r7 3.08 ?40c to +125c 3k sot-23-5 n08 adm824syks-r7 2.93 ?40c to +85c 3k sc70-5 n08 adm824syrt-r7 2.93 ?40c to +125c 3k sot-23-5 n08 adm824ryks-r7 2.63 ?40c to +85c 3k sc70-5 n08 adm824ryrt-r7 2.63 ?40c to +125c 3k sot-23-5 n08 adm824zyks-r7 2.32 ?40c to +85c 3k sc70-5 n08 adm824yyks-r7 2.19 ?40c to +85c 3k sc70-5 n08 model 1 reset threshold (v) temperature rang e quantity package type branding adm825lyks-r7 4.63 ?40c to +85c 3k sc70-5 n09 adm825lyrt-r7 4.63 ?40c to +125c 3k sot-23-5 n09 adm825myks-r7 4.38 ?40c to +85c 3k sc70-5 n09 adm825myrt-r7 4.38 ?40c to +125c 3k sot-23-5 n09 adm825tyks-r7 3.08 ?40c to +85c 3k sc70-5 n09 adm825tyrt-r7 3.08 ?40c to +125c 3k sot-23-5 n09 adm825syks-r7 2.93 ?40c to +85c 3k sc70-5 n09 adm825syrt-r7 2.93 ?40c to +125c 3k sot-23-5 n09 adm825ryks-r7 2.63 ?40c to +85c 3k sc70-5 n09 adm825ryrt-r7 2.63 ?40c to +125c 3k sot-23-5 n09 adm825zyks-r7 2.32 ?40c to +85c 3k sc70-5 n09 adm825yyks-r7 2.19 ?40c to +85c 3k sc70-5 n09 ? 2004 analog devices, inc. all rights reserved. trademarks and registered trademarks are the prop erty of their respective owners.
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