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rt9818 1 ds9818-09 april 2011 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 n-channel open-drain output z z z z z small sc-82, sc-70-3, sot-23-3, sot-23-5, sot-89 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 general description the rt9818 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 rt9818 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. rt9818 is provided in sc-82, sc-70-3, sot-23-3, sot-23-5 and sot-89 packages. marking information for marking information, contact our sales representative directly or through a richtek distributor located in your area. note : richtek 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. ordering information typical application circuit gnd reset/ reset vdd rt9818 reset/ reset vdd p pull up 100k rt9818 package type u3 : sc-70-3 v : sot-23-3 vl : sot-23-3 (l-type) b : sot-23-5 x : sot-89 y : sc-82 yr : sc-82 (r-type) lead plating system p : pb free g : green (halogen free and pb free) 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)
rt9818 2 ds9818-09 april 2011 www.richtek.com functional pin description pin name pin function gnd ground reset active low open-drain reset output reset active high open-drain reset output vdd power pin pin configurations (top view) sc-70-3 gnd vdd 2 3 reset/ reset sot-89 sot-23-5 vdd gnd nc nc 4 23 5 reset/ reset sot-23-3 (l-type) gnd vdd 2 3 reset/ reset sot-23-3 gnd vdd 2 3 reset/ reset sc-82 (r-type) nc vdd gnd 3 2 4 reset/ reset sc-82 gnd nc vdd 3 2 4 reset/ reset 23 1 gnd vdd reset/ reset function block diagram timing diagram timer vset threshold voltage setting por power on reset cmp n mos gnd reset/ reset vdd v th v dd delay time (0, 55, 220, 450ms) delay time (0, 55, 220, 450ms) v reset 0v 0v 0v v reset
rt9818 3 ds9818-09 april 2011 www.richtek.com absolute maximum ratings (note 1) z terminal voltage (with respect to gnd) v dd --------------------------------------------------------------------------------------------------------------------- ? 0.3v to 6v z all other inputs ----------------------------------------------------------------------------------------------------- ? 0.3v to (v dd + 0.3v) z input current, i vdd -------------------------------------------------------------------------------------------------- 20ma z power dissipation, p d @ t a = 25 c sc-70 / sc-82 ------------------------------------------------------------------------------------------------------- 0.25w sot-23-3 ------------------------------------------------------------------------------------------------------------- 0.4w sot-23-5 ------------------------------------------------------------------------------------------------------------- 0.4w sot -89 ---------------------------------------------------------------------------------------------------------------- 0.55w z package thermal resistance (note 2) sc-70 / sc-82, ja ------------------------------------------------------------------------------------------------- 400 c/w sot-23-3, ja -------------------------------------------------------------------------------------------------------- 250 c/w sot-23-5, ja -------------------------------------------------------------------------------------------------------- 250 c/w sot-89, ja ---------------------------------------------------------------------------------------------------------- 180 c/w z lead temperature (soldering, 10se c.) ---------------- --------------------------------------------------------- 260 c z storage temperature range ------------------------------------------------------------------------------------- ? 65 c to 125 c z esd susceptibility (note 3) hbm (human body mode) --------------------------------------------------------------------------------------- 2kv mm (ma chine mode) ----------------------------------------------------------------------------------------------- 200v electrical characteristics (v dd = 3v, unless otherwise specified) parameter symbol test conditions min typ max unit operating v dd (v out ) range v dd 0.9 -- 6 v supply current i dd v th = 3v, v dd = 4.5v, t a = 27 c -- 3 8 a reset threshold v th t a = 27 c -- 1.2 to 5 -- v threshold voltage accuracy v th t a = 27 c ? 1.5 -- 1.5 % v dd drop to reset delay t rd drop = v th ? 125mv -- 20 -- s rt9818a/e -- 0 -- rt9818b/f 35 55 75 rt9818c/g 143 220 297 reset active time out period rt9818d/h t rp v dd 1.02 x v th 292 450 608 ms reset output voltage low (note 5) v ol 3 = v dd < v th i sink > 3.5ma -- -- 0.4 v hysteresis width v hys -- 0.01v th 0.016v th v recommended operating conditions (note 4) z junction temperature range ------------------------------------------------------------------------------------- ? 40 c to 125 c z ambient temperature range ------------------------------------------------------------------------------------- ? 40 c to 85 c
rt9818 4 ds9818-09 april 2011 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. 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. note 3. devices are esd sensitive. handling precaution is recommended. note 4. the device is not guaranteed to function outside its operating conditions. note 5. the voltage v ol can be calculated by v ol = v dd ? ir * r. where r is the pull-up resistor and ir is the current flowing through the pull-up resistor. for typical application (r=100k ), v ol is less than 0.2v.
rt9818 5 ds9818-09 april 2011 www.richtek.com nch driver output current vs. v ds 0 20 40 60 80 100 120 012345 v ds (v) output current (ma ) typical operating characteristics rt9818a-45 v dd = 4.4v = 4v = 3.5v = 3v = 2.5v = 2v = 1.5v supply current vs. input voltage 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 0123456 input voltage (v) supply current ( a ) rt9818c-30 80 c 25 c ? 30 c supply current vs. input voltage 0 1 2 3 4 5 6 0123456 input voltage (v) supply current ( a ) 80 c 25 c ? 30 c rt9818a-12 nch driver output current vs. v ds 0 10 20 30 40 50 60 0 0.5 1 1.5 2 2.5 3 3.5 v ds (v) output current (ma ) v dd = 2v v dd = 1.5v rt9818c-30 v dd = 2.8v v dd = 2.5v nch driver output current vs. v ds 0.0 0.4 0.8 1.2 1.6 2.0 2.4 0 0.3 0.6 0.9 1.2 1.5 v ds (v) output current (ma ) v dd = 1v v dd = 1.1v rt9818a-12 output voltage vs. input voltage 0 1 2 3 4 5 6 7 0123456 input voltage (v) output voltage (v) 4.5v 1.2v rt9818
rt9818 6 ds9818-09 april 2011 www.richtek.com supply current vs. input voltage 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 0123456 input voltage (v) supply current ( a ) rt9818a-45 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 (c) power down reset delay (s ) rt9818c-30 v drop = 200mv v drop = 150mv v drop = 250mv power down reset delay vs. temperature 0 2 4 6 8 10 12 14 -50 -25 0 25 50 75 100 125 temperature (c) power down reset delay (s ) rt9818a-12 v drop = 200mv v drop = 150mv v drop = 250mv power down reset delay vs. temperature 0 5 10 15 20 25 30 35 40 45 -50-250 255075100125 temperature (c) power down reset delay (s) 1 rt9818a-45 v drop = 200mv v drop = 150mv v drop = 250mv reset threshold deviation vs. temperature 1 2 3 4 5 6 -50 -25 0 25 50 75 100 125 temperature (c) reset threshold (v) 4.5v 1.2v 4.2v 2.2v rt9818 5v nch driver sink current vs. input voltage 0 5 10 15 20 25 30 35 40 0 0.5 1 1.5 2 2.5 3 3.5 input voltage (v) sink current i sink (ma) rt9818c-30, v ds = 0.5v 80 c 25 c ? 30 c
rt9818 7 ds9818-09 april 2011 www.richtek.com power up reset time-out vs. temperature 0 20 40 60 80 100 -50 -25 0 25 50 75 100 125 temperature (c) power up reset time-out (s) v th = 5v v th = 4.5v rt9818a 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 (f) output delay time (ms ) v th = 1.2v v th = 4.5v rt9818 nch driver output current vs. input voltage 0 10 20 30 40 50 60 0123456 input voltage (v) nch driver output current (ma) 1 rt9818g-31 v ds = 0.5v 80 c 25 c ? 30 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) 1 v dd = 6v = 5.5v = 5v = 4.5v = 4v = 3.5v rt9818g-31 power up reset time-out vs. temperature 0 100 200 300 400 500 -50 -25 0 25 50 75 100 125 temperature (c) power up reset time-out (ms) v th = 2.9v v th = 3v rt9818c nch driver sink current vs. input voltage 0 10 20 30 40 50 012345 input voltage (v) sink current i sink (ma) rt9818a-45, v ds = 0.5v 80 c 25 c ? 30 c
rt9818 8 ds9818-09 april 2011 www.richtek.com power down reset time-out vs. temperature 0 100 200 300 400 500 -50 -25 0 25 50 75 100 125 temperature (c) power down reset time-out (ms ) rt9818g-31 power down reset time-out vs. temperature 0 5 10 15 20 25 30 -50-25 0 255075100125 temperature (c) power down reset time-out (s ) v drop = 200mv v drop = 150mv v drop = 250mv rt9818g-31 output voltage vs. input voltage 0 1 2 3 4 5 6 7 0123456 input voltage (v) output voltage (v) rt9818g-31 threshold voltage vs. temperature 2.00 2.05 2.10 2.15 2.20 2.25 2.30 2.35 2.40 -50 -25 0 25 50 75 100 125 temperature ( c) threshold voltage (v) 1 rising falling rt9818c-22 threshold voltage vs. temperature 4.00 4.05 4.10 4.15 4.20 4.25 4.30 4.35 4.40 -50-250 255075100125 temperature ( c) threshold voltage (v) 1 rising falling rt9818a-42
rt9818 9 ds9818-09 april 2011 www.richtek.com application information multiple supplies mainly, the pull-up connected to the rt9818 will connect to the supply voltage that is being monitored at the ic's vdd pin. however, some systems may use the open-drain output to level-shift from the monitored supply to reset circuitry powered by some other supply. 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.
rt9818 10 ds9818-09 april 2011 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
rt9818 11 ds9818-09 april 2011 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
rt9818 12 ds9818-09 april 2011 www.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
rt9818 13 ds9818-09 april 2011 www.richtek.com a a1 e b b d c h l sot-23-5 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 0.559 0.014 0.022 c 2.591 2.997 0.102 0.118 d 2.692 3.099 0.106 0.122 e 0.838 1.041 0.033 0.041 h 0.080 0.254 0.003 0.010 l 0.300 0.610 0.012 0.024
rt9818 14 ds9818-09 april 2011 www.richtek.com information that is provided by richtek technology corporation is believed to be accurate and reliable. richtek reserves the ri ght to make any change in circuit design, specification or other related things if necessary without notice at any time. no third party intellectual property infringemen t of the applications should be guaranteed by users when integrating richtek products into any application. no legal responsibility for any said applications is assumed b y richtek. 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) 5f, no. 95, minchiuan road, hsintien city taipei county, taiwan, r.o.c. tel: (8862)86672399 fax: (8862)86672377 email: marketing@richtek.com dimensions in millimeters dimensions in inches symbol min max min max a 1.397 1.600 0.055 0.063 b 0.356 0.483 0.014 0.019 b 2.388 2.591 0.094 0.102 b1 0.406 0.533 0.016 0.021 c 3.937 4.242 0.155 0.167 c1 0.787 1.194 0.031 0.047 d 4.394 4.597 0.173 0.181 d1 1.397 1.753 0.055 0.069 e 1.448 1.549 0.057 0.061 h 0.356 0.432 0.014 0.017 b b1 b h a b d c e e c1 d1 a 3-lead sot-89 surface mount package

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