preliminary rt9801 ds9801-02 august 2002 www.richtek.com 1 user programmable micro-power voltage detectors general description the rt9801 is a micro-power voltage detector supervising the power supply voltage level for microprocessors ( p) 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 3 a. selection of v th is easily achieved through 3 pins connected to gnd, vdd or floating for different threshold voltage settings. two versions of threshold voltages, 1.5v ~ 4v and 2.5v ~ 5v, which are programmed in factory are offered by customer demands. the rt9801 performs supervisory function by sending out a reset signal whenever the vdd voltage falls below a preset threshold level. this reset signal will last the whole peri od before vdd recovering. reset signal will release a fter vdd is recovered and lasts for the whole period of reset active time-out period. rt9801 is n-channel, open-drain output and provided in sot-26 package. ordering information rt9801 ? ? ? marking information part number marking rt9801ace 1j RT9801Bce 1k features z user programmable threshold 1.5v to 5v in 0.1v step with 3% accuracy z low supply current 3 a z quick reset within 20 s z built-in recovery delay 200ms z low functional supply voltage 0.9v z small sot-26 package applications z computers z controllers z intelligent instruments z critical p and c power monitoring z portable/battery-powered equipment pin configurations part number pin configurations rt9801 ? ce (plastic sot-26) top view 1. vset0 2. gnd 3. reset 4. vdd 5. vset2 6. vset1 typical application circuit operating temperature range c: commercial standard package type e : sot-26 reset threshold a : 2.5v~5v b : 1.5v~4v vset0 gnd reset vset1 vset2 vdd gnd reset vdd pull up RT9801B v th = 2.5v in this example p rt9801 64 3 2 1 5
rt9801 preliminary www.richtek.com ds9801-02 august 2002 2 pin description pin name pin function vset0 threshold voltage selection pin 1 gnd ground pin reset reset pulse output, negative pulse vdd power pin vset1 threshold voltage selection pin 2 vset2 threshold voltage selection pin 3 function block diagram vset cmp timer vdd por reset n threshold voltage setting power on reset internal clock vset0 vset1 vset2
preliminary rt9801 ds9801-02 august 2002 www.richtek.com 3 absolute maximum ratings z terminal voltage (with respect to gnd) vdd -0.3v to 6.0v all other inputs -0.3v to vdd+0.3v z input current, vdd 20ma z continuous power dissipation, p d @ t a = 25 c sot-26 0.25w z operating junction temperature range -40 c ~ 125 c z storage temperature range -65 c ~ 125 c z package thermal resistance sot-26, ja 250 c /w z lead temperature (soldering, 5sec.) 260 c electrical characteristics (vdd = 3v, 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 ~ 3.5v, i out = 0 v dd = 3.5v ~ 5v, i out = 0 -- -- 3.3 a 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 s reset active time out period t rp v dd 1.02 v th , programmable -- 200 -- ms v il t a = 27 c -- 0.15v 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
rt9801 preliminary www.richtek.com ds9801-02 august 2002 4 note 1: pin conditions for programmable threshold voltage setting rt9801a RT9801B vset0 input vset1 input vset2 input 54v 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 32gndv 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
preliminary rt9801 ds9801-02 august 2002 www.richtek.com 5 typical operating characteristics nch driver output current vs. v ds 0 1 2 3 4 5 6 7 0 0.5 1 1.5 2 2.5 3 v ds (v) output current i out (ma) 1.7v 1.5v t a = 25 c rt9801-20cv nch driver output current vs. v ds 0 2 4 6 8 10 12 00.511.522.53 v ds (v) output current i out (ma) 2.2v 2.0v 1.5v t a = 25 c rt9801-24cv nch driver output current vs. v ds 0 3 6 9 12 15 18 00.511.522.53 v ds (v) output current i out (ma) 1.5v 2.0v 2.8v t a = 25 c rt9801-30cv nch driver output current vs. v ds 0 6 12 18 24 30 36 01234 v ds (v) output current i out (ma) 2.0v 2.5v 4.0v 3.5v 3.0v 1.5v t a = 25 c rt9801-45cv nch driver output current vs. v ds 0 8 16 24 32 40 012345 v ds (v) output current i out (ma) 2.0v 2.5v 4.0v 3.5v 3.0v 1.5v 4.5v t a = 25 c rt9801-50cv output voltage vs. input voltage 0 1 2 3 4 5 6 7 0.0 1.0 2.0 3.0 4.0 5.0 6.0 input voltage v in (v) output voltage v out (v) 2.0v 2.4v 4.5v 3.0v 5.0v t a = 25 c
rt9801 preliminary www.richtek.com ds9801-02 august 2002 6 supply current vs. input voltage 0 1 2 3 4 0123456 input voltage v in (v) supply current i ss ( a) -30 c 25 c 80 c rt9808-20cv supply current vs. input voltage 0 1 2 3 4 0123456 input voltage v in (v) supply current i ss ( a) -30 c 25 c 80 c rt9808-24cv rt9801-24cv supply current vs. input voltage 0 1 2 3 4 0123456 input voltage v in (v) supply current i ss ( a) -30 c 25 c 80 c rt9808-30cv rt9801-30cv supply current vs. input voltage 0 1 2 3 4 5 0123456 input voltage v in (v) supply current i ss ( a) -30 c 25 c 80 c rt9808-45cv rt9801-45cv supply current vs. input voltage 0 1 2 3 4 5 0123456 input voltage v in (v) supply current i ss ( a) -30 c 25 c 80 c rt9808-50cv rt9801-50cv reset threshold deviation vs. temp. 2.4 2.8 3.2 3.6 4 4.4 4.8 5.2 -40 -15 10 35 60 85 temperature( c) threshold (v) 2.5v 3.0v 4.5v 5.0v
preliminary rt9801 ds9801-02 august 2002 www.richtek.com 7 power-up reset timeout vs. temp. 50 100 150 200 250 300 350 -40 -15 10 35 60 85 temperture ( c) power-up reset timeout (ms) 3v 4.5v 5v 2.4v 2v nch driver output current vs. input voltage 0 2 4 6 8 10 0 0.5 1 1.5 2 2.5 3 input voltage v in (v) output current i out (ma) -30 c 25 c 80 c rt9808-20cv v ds = 0.5v rt9801-20cv nch driver output current vs. input voltage 0 2 4 6 8 10 0 0.5 1 1.5 2 2.5 3 input voltage v in (v) output current i out (ma) -30 c 25 c 80 c rt9808-24cv v ds = 0.5v nch driver output current vs. input voltage 0 2 4 6 8 10 12 0 0.5 1 1.5 2 2.5 3 3.5 input voltage v in (v) output current i out (ma) -30 c 25 c 80 c rt9808-30cv v ds = 0.5v rt9801-30cv nch driver output current vs. input voltage 0 2 4 6 8 10 12 14 16 012345 input voltage v in (v) output current i out (ma) -30 c 25 c 80 c rt9808-45cv v ds = 0.5v rt9801-45cv nch driver output current vs. input voltage 0 3 6 9 12 15 18 0123456 input voltage v in (v) output current i out (ma) -30 c 25 c 80 c rt9808-50cv v ds = 0.5v rt9801-50cv
rt9801 preliminary www.richtek.com ds9801-02 august 2002 8 output delay time vs. load capacitance 1 10 100 1000 0.0001 0.001 0.01 0.1 load capacitance c out (uf) output delay time t p (ms) 5v 4.5v 3v 2v 2.4 v t a = 25 c power-down reset delay vs. temp. 0.0 1.0 2.0 3.0 4.0 -40 -15 10 35 60 85 temperture ( c) power-down reset delay ( s) v drop = 150mv rt9808-20cv v drop = 200mv v drop = 250mv power-down reset delay vs. temp. 0.0 0.5 1.0 1.5 2.0 2.5 3.0 -40 -15 10 35 60 85 temperture ( c) power-down reset delay ( s) v drop = 150mv rt9808-24cv v drop = 200mv v drop = 250mv power-down reset delay vs. temp. 0.0 0.3 0.6 0.9 1.2 1.5 -40 -15 10 35 60 85 temperture ( c) power-down reset delay ( s) v drop = 150mv rt9808-30cv v drop = 200mv v drop = 250mv power-down reset delay vs. temp. 0.0 0.3 0.6 0.9 1.2 1.5 -40 -15 10 35 60 85 temperture ( c) power-down reset delay ( s) v drop = 150mv rt9808-45cv v drop = 200mv v drop = 250mv power-down reset delay vs. temp. 0.0 0.3 0.6 0.9 1.2 1.5 -40 -15 10 35 60 85 temperture ( c) power-down reset delay ( s) v drop = 150mv rt9808-50cv v drop = 200mv v drop = 250mv rt9801-50cv
preliminary rt9801 ds9801-02 august 2002 www.richtek.com 9 package information dimensions in millimeters dimensions in inches symbol min max min max a 0.889 1.295 0.035 0.051 a1 -- 0.152 -- 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 0.102 0.254 0.004 0.010 l 0.356 0.610 0.014 0.024 sot- 26 surface mount package b b c d l h a1 e a
rt9801 preliminary www.richtek.com ds9801-02 august 2002 10 richtek technology corp. headquarter 5f, no. 20, taiyuen street, chupei city hsinchu, taiwan, r.o.c. tel: (8863)5526789 fax: (8863)5526611 richtek technology corp. taipei office (marketing) 8f-1, no. 137, lane 235, paochiao road, hsintien city taipei county, taiwan, r.o.c. tel: (8862)89191466 fax: (8862)89191465 email: marketing@richtek.com
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