low-voltage manual reset & watchdog supervisory circuits in 4-lead sc70 preliminary technical data ADM8611/adm8616/adm8617/adm8618 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 proper ty 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 ? 2004 analog devices, inc. all rights reserved. features precision 1.8v to 5v power supply monitoring 9 reset threshold options: 1.58v to 4.63v 140ms (min) reset timeout manual reset input (ADM8611) watchdog timer (adm8616Cadm8618) reset output stages push-pull active-low open-drain active-low push-pull active-high low power consumption (3a) guaranteed reset output valid to v cc =1v power supply glitch immunity specified over -40c to +85c temperature range 4-lead sc70 package applications microprocessor systems computers controllers intelligent instruments portable equipment general description the ADM8611/adm8616/adm8617/adm8618 are supervisory circuits which monitor power supply voltage levels and code execution integrity in microprocessor-based systems. a power-on-reset signal is generated when the supply voltage rises to a preset threshold level. the ADM8611s debounced manual reset input can be used to initiate a reset by means of an external push-button or logic signal. the adm8616Cadm8618 have an on-chip watchdog timer which can reset the microprocessor if it fails to strobe within a preset timeout period. functional block diagrams
figure 1. each part is available in a choice of the following 9 reset threshold options: 1.58v, 1.67v, 2.19v, 2.32v, 2.63v, 2.93v, 3.08v, 4.38v and 4.63v. the reset timeout periods are 20ms (min) and 140ms (min) for the ADM8611 and adm8616C adm8618, respectively. the watchdog timeout period is 1.6s (typ). the parts differ in terms of reset output configuration, as indicated in table 1. the ADM8611/adm8616/adm8617/ adm8618 are available in 4-lead sc70 packages and typically consume only 3a, making them suitable for use in low power portable applications . table 1. selection table output stage part no. manual reset watchdog reset reset ADM8611 yes - push-pull adm8616 - yes push-pull adm8617 - yes open-drain adm8618 - yes push-pull
ADM8611/adm8616/adm8617/adm8618 preliminary technical data rev. prb | page 2 of 7 ADM8611/adm8616/adm8617/ad m8618specifications table 2. v cc =full operating range, t a =t min to t max , unless otherwise noted parameter min typ max units test conditions/comments supply v cc operating voltage range 1 5.5 v supply current 10 20 a v cc =5.5v 5 12 a v cc =3.6v reset threshold voltage adm861_l 4.50 4.63 4.75 v t a =-40c to +85c adm861_m 4.25 4.38 4.50 v t a =-40c to +85c adm861_t 3.00 3.08 3.15 v t a =-40c to +85c adm861_s 2.85 2.93 3.00 v t a =-40c to +85c adm861_r 2.55 2.63 2.70 v t a =-40c to +85c adm861_z 2.25 2.32 2.38 v t a =-40c to +85c adm861_y 2.12 2.19 2.25 v t a =-40c to +85c adm861_w 1.62 1.67 1.71 v t a =-40c to +85c adm861_v 1.52 1.58 1.62 v t a =-40c to +85c reset threshold temperature coefficient 40 ppm/c reset threshold hysteresis 3 mv reset timeout period 20 30 40 ms ADM8611 140 200 280 ms adm8616Cadm8618 v cc to reset delay 40 s v cc falling at 1mv/s push-pull output (ADM8611, adm8616, adm8618) reset output voltage 0.3 v v cc >=1.0v, i sink =50a 0.3 v v cc >=1.2v, i sink =100a 0.3 v v cc >=2.7v, i sink =1.2ma 0.4 v v cc >=4.5v, i sink =3.2ma 0.8x v cc v v cc >=2.7v, i source =500a v cc -1.5 v v cc >=4.5v, i source =800a reset rise time 5 25 ns from 10% to 90% v cc , c l =5pf, v cc =3.3v reset output voltage 0.3 v v cc >=2.7v, i sink =1.2ma 0.4 v v cc >=4.5v, i sink =3.2ma 0.8x v cc v v cc >=1.8v, i source =150a 0.8x v cc v v cc >=2.7v, i source =500a v cc -1.5 v cc >=4.5v, i source =800a open-drain output (adm8617) reset output voltage 0.3 v v cc >=1.0v, i sink =50a 0.3 v v cc >=1.2v, i sink =100a 0.3 v v cc >=2.7v, i sink =1.2ma 0.4 v v cc >=4.5v, i sink =3.2ma open-drain reset output leakage current 1 a
preliminary technical data ADM8611/adm8616/adm8617/adm8618 rev. prb | page 3 of 7 parameter min typ max units test conditions/comments manual reset input (ADM8611) mr input threshold 0.3xv cc v 0.7xv cc v mr input pulse width 1 s mr glitch rejection 100 ns mr pull-up resistance 25 50 75 k mr to reset delay 200 ns watchdog input (adm8616, adm8617, adm8618) watchdog timeout period 4.3 6.3 9.3 ms adm86___w 71 102 153 ms adm86___x 1.12 1.6 2.4 s adm86___y 17.9 25.6 38.4 s adm86___z wdi pulse width 50 ns v il =0.3xv cc , v ih =0.7xv cc , wdi input threshold 0.3xv cc v 0.7xv cc v wdi input current 120 160 a v wdi = v cc , time average -20 -15 a v wdi =0, time average absolute maximum ratings table 3. t a = 25c unless otherwise noted. parameter rating v cc -0.3v to +6v reset /reset -0.3v to +6v output current (reset, reset ) 20ma operating temperature range -40c to +85c storage temperature range -65c to +150c ja thermal impedance, sc70 146c/w lead temperature soldering (10 sec) 300c vapour 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.
ADM8611/adm8616/adm8617/adm8618 preliminary technical data rev. prb | page 4 of 7 pin configurations and functional descriptions
table 4. pin functional descriptions pin no. name description 1 reset (adm8616/adm8617) active-low reset output, which is asserted whenever v cc is below the reset.threshold, v th . push-pull output stage for adm8616. open-drain output stage for adm8617. reset (adm8618) active-high, push-pull reset output. 2 mr (ADM8611) manual reset input. this is an active-low in put which, when forced low for at least 1s, generates a reset. features a 52k internal pull-up. wdi (adm8616/adm8617/adm8618) watchdog input. generates a reset if the logic level on the pin remains low or high for the duration of the watchdog timeout. the timer is cleared if a logic transi tion occurs on this pin or if a reset is generated. leave floating to disable the watchdog timer. 3 gnd ground 4 v cc power supply voltage being monitored. 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.
preliminary technical data ADM8611/adm8616/adm8617/adm8618 rev. pra | page 5 of 7 outline dimensions 0.30 0.15 0.10 max 1.00 0.80 seating plane 0.18 0.10 0.30 0.10 0.10 coplanarity 2 4 3 1 2.20 1.80 pin 1 0.50 bsc 0.70 0.50 1.35 1.15 2.40 1.80 1.10 0.80 0.65 bsc p ackage outline corresponds in full to eiaj sc82 except for width of pin-2 as shown figure 2. 4-lead plastic surface mount package [sc70] (ks-4) dimensions shown in millimeters
ADM8611/adm8616/adm8617/adm8618 preliminary technical data rev. prb | page 6 of 7 ordering guide (ADM8611/adm8616) model 1 reset threshold (v) temperature range quantity package type branding ADM8611labks-rl 4.63 -40c to +85c 10k sc70-4 n0f ADM8611labks-rl7 4.63 -40c to +85c 3k sc70-4 n0f ADM8611mabks-rl 4.38 -40c to +85c 10k sc70-4 n0f ADM8611mabks-rl7 4.38 -40c to +85c 3k sc70-4 n0f ADM8611tabks-rl 3.08 -40c to +85c 10k sc70-4 n0f ADM8611tabks-rl7 3.08 -40c to +85c 3k sc70-4 n0f ADM8611sabks-rl 2.93 -40c to +85c 10k sc70-4 n0f ADM8611sabks-rl7 2.93 -40c to +85c 3k sc70-4 n0f ADM8611rabks-rl 2.63 -40c to +85c 10k sc70-4 n0f ADM8611rabks-rl7 2.63 -40c to +85c 3k sc70-4 n0f ADM8611zabks-rl 2.32 -40c to +85c 10k sc70-4 n0f ADM8611zabks-rl7 2.32 -40c to +85c 3k sc70-4 n0f ADM8611yabks-rl 2.19 -40c to +85c 10k sc70-4 n0f ADM8611yabks-rl7 2.19 -40c to +85c 3k sc70-4 n0f ADM8611wabks-rl 1.67 -40c to +85c 10k sc70-4 n0f ADM8611wabks-rl7 1.67 -40c to +85c 3k sc70-4 n0f ADM8611vabks-rl 1.58 -40c to +85c 10k sc70-4 n0f ADM8611vabks-rl7 1.58 -40c to +85c 3k sc70-4 n0f adm8616laks-rl 4.63 -40c to +85c 10k sc70-4 n0g adm8616laks-rl7 4.63 -40c to +85c 3k sc70-4 n0g adm8616maks-rl 4.38 -40c to +85c 10k sc70-4 n0g adm8616maks-rl7 4.38 -40c to +85c 3k sc70-4 n0g adm8616taks-rl 3.08 -40c to +85c 10k sc70-4 n0g adm8616taks-rl7 3.08 -40c to +85c 3k sc70-4 n0g adm8616saks-rl 2.93 -40c to +85c 10k sc70-4 n0g adm8616saks-rl7 2.93 -40c to +85c 3k sc70-4 n0g adm8616raks-rl 2.63 -40c to +85c 10k sc70-4 n0g adm8616raks-rl7 2.63 -40c to +85c 3k sc70-4 n0g adm8616zaks-rl 2.32 -40c to +85c 10k sc70-4 n0g adm8616zaks-rl7 2.32 -40c to +85c 3k sc70-4 n0g adm8616yaks-rl 2.19 -40c to +85c 10k sc70-4 n0g adm8616yaks-rl7 2.19 -40c to +85c 3k sc70-4 n0g adm8616waks-rl 1.67 -40c to +85c 10k sc70-4 n0g adm8616waks-rl7 1.67 -40c to +85c 3k sc70-4 n0g adm8616vaks-rl 1.58 -40c to +85c 10k sc70-4 n0g adm8616vaks-rl7 1.58 -40c to +85c 3k sc70-4 n0g
preliminary technical data ADM8611/adm8616/adm8617/adm8618 rev. pra | page 7 of 7 ordering guide (adm8617/adm8618) 1 entries in bold type are standard models. conta ct factory for availability of non-standard models. model reset threshold (v) temperature range quantity package type branding adm8617lacyks-rl 4.63 -40c to +85c 10k sc70-4 n0h adm8617lacyks-rl7 4.63 -40c to +85c 3k sc70-4 n0h adm8617macyks-rl 4.38 -40c to +85c 10k sc70-4 n0h adm8617macyks-rl7 4.38 -40c to +85c 3k sc70-4 n0h adm8617tacyks-rl 3.08 -40c to +85c 10k sc70-4 n0h adm8617tacyks-rl7 3.08 -40c to +85c 3k sc70-4 n0h adm8617sacyks-rl 2.93 -40c to +85c 10k sc70-4 n0h adm8617sacyks-rl7 2.93 -40c to +85c 3k sc70-4 n0h adm8617racyks-rl 2.63 -40c to +85c 10k sc70-4 n0h adm8617racyks-rl7 2.63 -40c to +85c 3k sc70-4 n0h adm8617zacyks-rl 2.32 -40c to +85c 10k sc70-4 n0h adm8617zacyks-rl7 2.32 -40c to +85c 3k sc70-4 n0h adm8617yacyks-rl 2.19 -40c to +85c 10k sc70-4 n0h adm8617yacyks-rl7 2.19 -40c to +85c 3k sc70-4 n0h adm8617wacyks-rl 1.67 -40c to +85c 10k sc70-4 n0h adm8617wacyks-rl7 1.67 -40c to +85c 3k sc70-4 n0h adm8617vacyks-rl 1.58 -40c to +85c 10k sc70-4 n0h adm8617vacyks-rl7 1.58 -40c to +85c 3k sc70-4 n0h adm8618lacyks-rl 4.63 -40c to +85c 10k sc70-4 n0j adm8618lacyks-rl7 4.63 -40c to +85c 3k sc70-4 n0j adm8618macyks-rl 4.38 -40c to +85c 10k sc70-4 n0j adm8618macyks-rl7 4.38 -40c to +85c 3k sc70-4 n0j adm8618tacyks-rl 3.08 -40c to +85c 10k sc70-4 n0j adm8618tacyks-rl7 3.08 -40c to +85c 3k sc70-4 n0j adm8618sacyks-rl 2.93 -40c to +85c 10k sc70-4 n0j adm8618sacyks-rl7 2.93 -40c to +85c 3k sc70-4 n0j adm8618racyks-rl 2.63 -40c to +85c 10k sc70-4 n0j adm8618racyks-rl7 2.63 -40c to +85c 3k sc70-4 n0j adm8618zacyks-rl 2.32 -40c to +85c 10k sc70-4 n0j adm8618zacyks-rl7 2.32 -40c to +85c 3k sc70-4 n0j adm8618yacyks-rl 2.19 -40c to +85c 10k sc70-4 n0j adm8618yacyks-rl7 2.19 -40c to +85c 3k sc70-4 n0j adm8618wacyks-rl 1.67 -40c to +85c 10k sc70-4 n0j adm8618wacyks-rl7 1.67 -40c to +85c 3k sc70-4 n0j adm8618vacyks-rl 1.58 -40c to +85c 10k sc70-4 n0j adm8618vacyks-rl7 1.58 -40c to +85c 3k sc70-4 n0j ? 2004 analog devices, inc. all rights reserved. trademarks and registered trademarks are the proper ty of their respective companies. printed in the u.s.a. pr04795-0-3/04(pra)
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