rt9802 1 ds9802-09 april 2011 www.richtek.com pin configurations user programmable micro-power voltage detectors marking information for marking information, contact our sales representative directly or through a richtek distributor located in your area. ordering information general description the rt9802 is a micro-power voltage detector supervising the power supply voltage level for microprocessors (up) or digital systems. it provides user programmable threshold levels with 0.1v step ranging from 1.5v to 5v, which covers most digital applications. it features low supply current of 3ua. selection of v th is easily achieved through 3 pins connected to gnd, v dd or floating for different threshold voltage settings. two versions of threshold voltages, 1.5v to 4v and 2.5v to 5v, which are programmed in factory are offered by customer demands. the rt9802 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. reset signal will release after v dd is recovered and lasts for the whole period of reset active time-out period. rt9802 is cmos, active-low output and provided in sot-23-6 package. features z z z z z user programmable threshold 1.5v to 5v in 0.1v step with 3% accuracy z z z z z low supply current 3ua z z z z z quick reset within 20us z z z z z built-in recovery delay 200ms z z z z z low functional supply voltage 0.9v z z z z z small sot-23-6 package 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 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. (top view) sot-23-6 vset0 gnd vset1 vset2 vdd 4 23 5 6 reset rt9802 package type e : sot-23-6 lead plating system p : pb free g : green (halogen free and pb free) reset threshold a : 2.5v to 5v b : 1.5v to 4v -
rt9802 2 ds9802-09 april 2011 www.richtek.com function block diagram functional pin description pin name pin function vset0 threshold voltage selection pin 1 gnd ground pin rese reset pulse output, negative pulse vdd power pin vset1 threshold voltage selection pin 2 vset2 threshold voltage selection pin 3 typical application circuit vset0 gnd reset vset1 vset2 vdd rt9802 gnd reset vdd p rt9802b v th = 2.5v in this example vset cmp timer por internal clock vset1 n mos vset0 vset2 p mos power on reset threshold voltage setting reset gnd vdd
rt9802 3 ds9802-09 april 2011 www.richtek.com absolute maximum ratings z terminal voltage (with respect to gnd) v dd ------------------------------------------------------------------------------------------------------------------------ ? 0.3v to 6.0v all other inputs -------------------------------------------------------------------------------------------------------- ? 0.3v to v dd +0.3v z input current, v dd ----------------------------------------------------------------------------------------------------- 20ma z continuous power dissipation, p d @ t a = 25 c sot-23-6 ---------------------------------------------------------------------------------------------------------------- 0.25w z operating junction temperature range -------------------------------------------------------------------------- ? 40 c to 125 c z storage temperature range ---------------------------------------------------------------------------------------- ? 65 c to 125 c z package thermal resistance sot-23-6 , ja ----------------------------------------------------------------------------------------------------------- 250 c /w z lead temperature (soldering, 10 se c.) --------------------------------------------------------------------------- 260 c electrical characteristics (v dd = 3.0, unless specified) parameter symbol test conditions min typ max units operating vdd (v out ) range v dd 0.9 -- 6 v -- 3 supply current i dd v dd = 1.5v to 3.5v, i out = 0 v dd = 3.5v to 5v, i out = 0 3.3 ua reset threshold v th t a = 27 c -- note1 -- v threshold voltage accuracy v th t a = 27 c -- 3 % v cc drop to reset delay t rd drop = ? 125mv -- -- 20 us reset active time out period t rp v dd 1. 02 v th , programmable -- 200 -- ms v il t a = 27 c -- 0.2v dd -- vset pin input threshold v ih t a = 27 c -- 0.85v dd -- v reset output voltage v ol v dd < v th , i sink = 3.5ma -- 0.4 -- v
rt9802 4 ds9802-09 april 2011 www.richtek.com note 1: pin conditions for programmable threshold voltage setting rt9802a rt9802b vset0 input vset1 input vset2 input 5 4 v dd v dd v dd 4.9 3.9 v dd v dd floating 4.8 3.8 v dd v dd gnd 4.7 3.7 v dd floating v dd 4.6 3.6 v dd floating floating 4.5 3.5 v dd floating gnd 4.4 3.4 v dd gnd v dd 4.3 3.3 v dd gnd floating 4.2 3.2 v dd gnd gnd 4.1 3.1 floating v dd v dd 4 3 floating v dd floating 3.9 2.9 floating v dd gnd 3.8 2.8 floating floating v dd 3.7 2.7 floating floating floating 3.6 2.6 floating floating gnd 3.5 2.5 floating gnd v dd 3.4 2.4 floating gnd floating 3.3 2.3 floating gnd gnd 3.2 2.2 gnd v dd v dd 3.1 2.1 gnd v dd floating 3 2 gnd v dd gnd 2.9 1.9 gnd floating v dd 2.8 1.8 gnd floating floating 2.7 1.7 gnd floating gnd 2.6 1.6 gnd gnd v dd 2.5 1.5 gnd gnd floating v dd : bond to v dd ; 0: bond to gnd; f: no bonding
rt9802 5 ds9802-09 april 2011 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 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 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 outline dimension a a1 e b b d c h l sot-23-6 surface mount package dimensions in millimeters dimensions in inches symbol min max min max a 0.889 1.295 0.031 0.051 a1 0.000 0.152 0.000 0.006 b 1.397 1.803 0.055 0.071 b 0.250 0.560 0.010 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
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