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rt9819 1 ds9819-05 august 2007 www.richtek.com features z z z z z internally fixed threshold 1.2v to 5v in 0.1v step z z z z z high accuracy 1.5% z z z z z low supply current 3 a z z z z z no external components required z z z z z quick reset within 20 s z z z z z built-in recovery delay include 0ms, 55ms, 220ms, 450ms options z z z z z low functional supply voltage 0.9v z z z z z cmos push-pull output z z z z z small sc-70-3, sc-82 and sot-23-3 packages z z z z z rohs compliant and 100% lead (pb)-free applications z computers z controllers z intelligent instruments z critical p and c power monitoring z portable/battery-powered equipment micro-power voltage detectors ordering information general description the rt9819 is a micro-power voltage detector supervising the power supply voltage level for microprocessors ( p) or digital systems. it provides internally fixed threshold levels with 0.1v per step ranging from 1.2v to 5v, which covers most digital applications. it features low supply current of 3 a. the rt9819 performs supervisory function by sending out a reset signal whenever the v dd voltage falls below a preset threshold level. this reset signal will last the whole period before v dd recovering. once v dd recovered upcrossing the threshold level, the reset signal will be released after a certain delay time. rt9819 is provided i n sc-70-3, sc-82 and sot-23-3 packages. marking information for marking information, contact our sales representative directly or through a richtek distributor located in your area, otherwise visit our website for detail. note : richtek pb-free and green products are : ` rohs compliant and compatible with the current require- ments of ipc/jedec j-std-020. ` suitable for use in snpb or pb-free soldering processes. ` 100%matte tin (sn) plating. rt9819 package type u3 : sc-70-3 v : sot-23-3 vl : sot-23-3 (l-type) y : sc-82 yr : sc-82 (r-type) operating temperature range p : pb free with commercial standard g : green (halogen free with commer- cial standard) threshold voltage 12 : 1.2v 13 : 1.3v : 49 : 4.9v 50 : 5.0v - reset active timeout period a = 0ms (reset) b = 55ms (reset) c = 220ms (reset) d = 450ms (reset) e = 0ms (reset) f = 55ms (reset) g = 220ms (reset) h = 450ms (reset) typical application circuit rt9819 vdd gnd reset/ reset vdd reset/ reset up
rt9819 2 ds9819-05 august 2007 www.richtek.com function block diagram functional pin description pin name pin function gnd ground reset active low push-pull reset output reset active high push-pull reset output vdd power pin timer vset threshold voltage setting por power on reset cmp n mos reset/ reset vdd vdd p mos pin configurations (top view) sot-23-3 (l-type) 2 3 1 reset/ reset gnd vdd 2 3 1 reset/ reset gnd vdd sot-23-3 sc-70-3 1 2 3 reset/ reset gnd vdd sc-82 (r-type) 4 1 3 2 vdd nc gnd reset/ reset sc-82 4 1 3 2 gnd nc vdd reset/ reset note : there is no pin1 indicator on top mark for sc-82 type, and pin 1 will be lower left pin when reading top mark from left to right. pin2 of sc-82 is wider than other pins.
rt9819 3 ds9819-05 august 2007 www.richtek.com absolute maximum ratings (note 1) z terminal voltage (with respect to gnd) v dd ------------------------------------------------------------------------------------------------------------------------ ? 0.3v to 6.0v z all other inputs -------------------------------------------------------------------------------------------------------- ? 0.3v to v dd +0.3v z input current, i vdd ----------------------------------------------------------------------------------------------------- 20ma z power dissipation, pd @ t a = 25 c sc-70-3/sc-82 --------------------------------------------------------------------------------------------------------- 0.25w sot-23-3 ---------------------------------------------------------------------------------------------------------------- 0.4w z package thermal resistance (note 4) sc-70-3/sc-82, ja --------------------------------------------------------------------------------------------------- 400 c /w sot-23-3, ja ----------------------------------------------------------------------------------------------------------- 250 c /w z lead temperature (soldering, 10sec.) ---------------------------------------------------------------------------- 260 c z storage temperature range ---------------------------------------------------------------------------------------- ? 65 c to 125 c z esd susceptibility (note 2) hbm (human body mode) ------------------------------------------------------------------------------------------ 2kv mm (ma chine mode) -------------------------------------------------------------------------------------------------- 200v electrical characteristics recommended operating conditions (note 3) z junction temperature range ---------------------------------------------------------------------------------------- ? 40 c to 125 c z ambient temperature range ---------------------------------------------------------------------------------------- ? 40 c to 85 c (v dd = 3v, t a = 25 c, unless otherwise specified) parameter symbol test conditions min typ max units operating v dd (v out ) range v dd rt9819a/b/c/d 0.9 -- 6 v rt9819e/f/g/h 1.1 -- 6 supply current i dd v th = 3v , v dd = 4.5v -- 3 8 a r eset threshold v th -- 1.2 to 5.0 -- v threshold voltage accuracy v th ? 1.5 -- +1.5 % threshold voltage hysteresis v hys -- 0.01 v th -- v v dd drop to reset delay t rd drop = v th ? 125mv -- 20 -- s reset active time out period rt9819a/e t rp v dd 1.02 v th -- 0 -- ms rt9819b/f 35 55 75 ms rt9819c/g 143 220 297 ms rt9819d/h 292 450 608 ms reset output voltage low v ol v dd < v th(min) ,i sink = 3 .5m a, v th 3v -- -- 0 .4 v v dd < v th(min) ,i sink = 1 .2m a, v th 1.8v -- -- 0 .3 v th(min) > v dd > 1v, i sink = 0.5ma -- -- 0 .3 to be continued
rt9819 4 ds9819-05 august 2007 www.richtek.com note 1. stresses listed as the above ? absolute maximum ratings ? may cause permanent damage to the device. these are for stress ratings. functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may remain possibility to affect device reliability. note 2. devices are esd sensitive. handling precaution recommended. note 3. the device is not guaranteed to function outside its operating conditions. note 4. ja is measured in the natural convection at t a = 25 c on a low effective thermal conductivity test board of jedec 51-3 thermal measurement standard. parameter symbol test conditions min typ max units reset output voltage high v oh v dd > v th(max) , i sour ce = 800 a, v th 3v v dd ? 1.5 -- -- v v dd > v th(max) , i sour ce = 500 a, v th 1.8v 0.8 v dd -- -- v dd > v th(max) , i sour ce = 200 a, v th 1.1v 0.8 v dd -- -- reset output voltage low v ol v dd > v th(max) ,i sink = 3.5ma, v th 3v -- -- 0.4 v v dd > v th(max) ,i sink = 1.2ma, v th 1.8v -- -- 0.3 v dd > v th(max) ,i sink = 0.5ma, v th 1.2v -- -- 0.3 reset output voltage high v oh 1.1v < v dd < v th(min) , i sour ce = 200 a 0.8 v dd -- -- v 1.8v < v dd < v th(min) , i sour ce = 500 a 0.8 v dd -- -- 3v < v dd < v th (mi n) , i sour ce = 800 a v dd ? 1.5 -- --
rt9819 5 ds9819-05 august 2007 www.richtek.com typical operating characteristics nch driver output current vs. v ds 0 0.4 0.8 1.2 1.6 2 2.4 0 0.3 0.6 0.9 1.2 1.5 v ds (v) output current (ma) rt9819a-12 v dd = 1.1v v dd = 1.0v nch driver output current vs. v ds 0 10 20 30 40 50 60 00.5 11.5 22.5 33.5 v ds (v) output current (ma) rt9819c-30 v dd = 2.8v v dd = 2.5v v dd = 2.0v v dd = 1.5v nch driver output current vs. v ds 0 20 40 60 80 100 120 012345 v ds (v) output current (ma) rt9819a-45 v dd = 4.4v = 4.0v = 3.5v = 3.0v = 2.5v = 2.0v = 1.5v output voltage vs. input voltage 0 1 2 3 4 5 6 7 0123456 input voltage (v) output voltage (v) 5.0v 3.0v 2.9v rt9819a supply current vs. input voltage 0 1 2 3 4 5 6 0123456 input voltage (v) supply current (ua) rt9819a-12 80 c 25 c -30 c supply current vs. input voltage 0 1 2 3 4 0123456 input voltage (v) supply current idd (ua) rt9819c-30 80 c 25 c -30 c
rt9819 6 ds9819-05 august 2007 www.richtek.com nch driver sink current vs. input voltage 0 10 20 30 40 50 012345 input voltage (v) sink current i sink (ma) rt9819a-45, v ds = 0.5v 80 c 25 c -30 c power-down reset delay vs. temperature 0 5 10 15 20 25 30 35 40 45 -50 -25 0 25 50 75 100 125 temperature power-down reset delay (us) rt9819a-45 v drop = 200mv v drop = 150mv v drop = 250mv ( c) nch driv er sink current v s. input voltage 0 10 20 30 40 00.511.522.533.5 input voltage (v) sink current i sink (ma) rt9819c-30, v ds = 0.5v 80 c 25 c -30 c power-down reset delay vs. temperature 0 5 10 15 20 25 30 35 40 45 -50 -25 0 25 50 75 100 125 temperature power-down reset delay (us) rt9819c-30 v drop = 200mv v drop = 150mv v drop = 250mv ( c) power-down reset delay vs. temperature 0 3 6 9 12 15 -50 -25 0 25 50 75 100 125 temperature power-down reset delay (us) rt9819a-12 v drop = 200mv v drop = 150mv v drop = 250mv ( c) supply current v s. input voltage 0 1 2 3 4 0123456 input voltage (v) supply current (ua) rt9819a-45 80 c 25 c -30 c
rt9819 7 ds9819-05 august 2007 www.richtek.com output delay time vs. load capacitance 0.01 0.1 1 10 100 1000 0.0001 0.0010 0.0100 0.1000 1.0000 load capacitance (uf) output delay time (ms) v th = 2.9v v th = 3.0v v th = 5.0v rt9819 pch driver output current vs. input voltage 0 5 10 15 20 25 0123456 input voltage (v) output current (ma) rt9819c-30 v ds = 2.1v v ds = 1.5v v ds = 1.0v v ds = 0.5v reset threshold deviation vs. temperature 1.00 2.00 3.00 4.00 5.00 6.00 -50 -25 0 25 50 75 100 125 temperature reset threshold deviation (v) 5.0v 1.2v 4.5v 4.2v 2.2v ( c) rt9819 power-up reset time-out vs. temperature 0 25 50 75 100 -50 -25 0 25 50 75 100 125 temperature power-up reset time-out (ms) v th = 5.0v v th = 4.5v rt9819a ( c) ( s) power-up reset time-out vs. temperature 0 100 200 300 400 500 -50 -25 0 25 50 75 100 125 temperature power-up reset time-out (ms) v th = 2.9v v th = 3.0v rt9819c ( c) nch driver output current vs. v ds 0 20 40 60 80 100 120 140 160 0123456 v ds (v) nch driver output current (ma) v dd = 6.0v = 5.5v = 5.0v = 4.5v = 4.0v = 3.5v rt9819g-31
rt9819 8 ds9819-05 august 2007 www.richtek.com nch driver output current vs. input voltage 0 10 20 30 40 50 60 0123456 input voltage (v) nch driver output current (ma) 1 rt9819g-31 v ds = 0.5v 80 c 25 c -30 c output voltage vs. input voltage 0 1 2 3 4 5 6 7 0123456 input voltage (v) output voltage (v) rt9819g-31 power-down reset time-out vs. temperature 0 5 10 15 20 25 30 -50 -25 0 25 50 75 100 125 temperature power-down reset time-out (us ) v drop = 200mv v drop = 150mv v drop = 250mv ( c) rt9819g-31 power down reset time-out vs. temperature 0 100 200 300 400 500 -50 -25 0 25 50 75 100 125 temperature power down reset time-out (ms ) rt9819g-31 ( c)
rt9819 9 ds9819-05 august 2007 www.richtek.com application information benefits of highly accurate reset threshold most p supervisor ics have reset threshold voltages between 1% and 1.5% below the value of nominal supply voltages. this ensures a reset will not occur within 1% of the nominal supply, but will occur when the supply is 1.5% below nominal.
rt9819 10 ds9819-05 august 2007 www.richtek.com outline dimension a b a1 b d c e h l sc - 70 - 3 surface mount package dimensions in millimeters dimensions in inches symbol min max min max a 0.800 1.100 0.031 0.044 a1 0.000 0.100 0.000 0.004 b 1.150 1.350 0.045 0.054 b 0.150 0.400 0.006 0.016 c 1.800 2.450 0.071 0.096 d 1.800 2.250 0.071 0.089 e 1.300 0.051 h 0.080 0.260 0.003 0.010 l 0.210 0.460 0.008 0.018
rt9819 11 ds9819-05 august 2007 www.richtek.com dimensions in millimeters dimensions in inches symbol min max min max a 0.800 1.100 0.031 0.043 a1 0.000 0.100 0.000 0.004 b 1.150 1.350 0.045 0.053 b 0.150 0.400 0.006 0.016 b1 0.350 0.500 0.014 0.020 c 1.800 2.450 0.071 0.096 d 1.800 2.200 0.071 0.087 e 1.300 0.051 h 0.080 0.260 0.003 0.010 l 0.200 0.460 0.008 0.018 sc - 82 surface mount package e d a c b a1 l b b1 h e
rt9819 12 ds9819-05 august 2007 www.richtek.com richtek technology corporation headquarter 5f, no. 20, taiyuen street, chupei city hsinchu, taiwan, r.o.c. tel: (8863)5526789 fax: (8863)5526611 richtek technology corporation taipei office (marketing) 8f, no. 137, lane 235, paochiao road, hsintien city taipei county, taiwan, r.o.c. tel: (8862)89191466 fax: (8862)89191465 email: marketing@richtek.com a b a1 b d c e h l sot-23-3 surface mount package dimensions in millimeters dimensions in inches symbol min max min max a 0.889 1.295 0.035 0.051 a1 0.000 0.152 0.000 0.006 b 1.397 1.803 0.055 0.071 b 0.356 0.508 0.014 0.020 c 2.591 2.997 0.102 0.118 d 2.692 3.099 0.106 0.122 e 1.803 2.007 0.071 0.079 h 0.080 0.254 0.003 0.010 l 0.300 0.610 0.012 0.024

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