bui l t - in del a y circuit high - p rec i sion vo l t age detec t or ec9509c/ 08c page 1 / 10 5d15n - rev. f002 e - cmos corp. h tt p ://ww w .e c m o s.c o m .tw sot - 23 - 5 pin no sot343 pin no symbol descrition 1 4 out vo l t age detection pin 2 2 vdd vo l t age i nput pin 3 1 vss ground p in 4 --- n.c no c o n n e ction 5 3 cd connect i on pin del a y ca p aci t o r introduc t ion (general description) the ec9509c / 08c s eries is a h i gh - precisi o n vol t age detector developed using cm o s process. the detection vol t age is fixed internally with an accuracy of 2.0 %. a time delayed reset can be accompli s hed with t he additio n of an external ca p a c i to r . t w o output forms, n - channel open - drain and cmos output, are availabl e . features ? ultra - low current cons um ption 1.0 ma typ. (vdd=2.0 v) 1.1 ma typ. (vdd=3.5 v) ? high - precision detection voltage 2 . 0 % ? c operating voltage ran ge 2. 0 v to 6.0 v ? detection voltage 2. 2 v t o 3.1 v (0.1 v step) ? hysteresis characteristics 5 % typ. ? two output forms: cmos o utput active l open - drain output active l applications ? power supply monitor for portable e q uipment such as el ec tronic org anizers, noteb o ok pcs, cellular ph o nes, digit a l cameras ? constant voltage power monitor for cameras, communication equipment and video equipment ? power moni t or and reset for cpus and microcomputers packages sot - 23 - 5 sot343 pin ass i gnment (sot - 23 - 5) sot343(sc82)
bui l t - in del a y circuit high - p rec i sion vo l t age detec t or ec9509c/ 08c page 2 / 10 5d15n - rev. f002 e - cmos corp. h tt p ://ww w .e c m o s.c o m .tw block diagrams c m o s out p u t ec9509 c open d r ain ec9508 c ordering information p a r t number marking id p ackage p acking type ec9508c xxb - f 08cx x f sot23 - 5 t ape / reel ec9508c xxb - g 08cx x g sot23 - 5 t ape / reel ec9508cxxc4 - g xxyw sot343 tape/ reel ec9509c xxb - f 09cx x f sot23 - 5 t ape / reel ec9509c xxb - g 09cx x g sot23 - 5 t ape / re e l package marking indication sot - 23 - 5 marking marking id xxxxx lot no. xx voltage yw date code
bui l t - in del a y circuit high - p rec i sion vo l t age detec t or ec9509c/ 08c page 3 / 10 5d15n - rev. f002 e - cmos corp. h tt p ://ww w .e c m o s.c o m .tw absolute maximum ratings p arame t e r symbol r a ting unit pow e r supp l y v o l t age v dd - v ss 8 v cd pin i n p ut vo l t age v cd v ss - 0.3 t o v dd +0.3 v out p ut v o l t age v o u t v ss - 0.3 t o v dd +0.3 v out p ut c urr e nt i out 4 m a pow e r d i ssi p a tion p d sot23 - 5 500 m w sot343 250 mw op e r a t in g tem p e r a tu r e t opr - 40 t o +85 s t or a ge tem p er a t ure tstg - 40 t o +125 junction temper a t ure tj(max) 150 junction t o amb i e n t therm a l resi s t a nce ja 347 /w junction t o case t he r mal r esis t a n c e jc 148 /w electrical characteristics cmos out p ut prod u c ts (ta = 2 5 c u nless oth e rw i s e sp e c ified) parameter s y mbol conditi o ns min t y p max unit test circuit det e ction voltage - v det -- - v det (s) x 0.98 - v det - v det (s) x 1.02 v 1 hysteres i s w i dth v h y s -- - v det x0.03 - v det x0.05 - v det x0.08 v 1 curr e nt co ns umption i ss v dd =4v -- 4.5 6.5 ua 2 operating vo l tage v dd -- 2. 0 -- 6.0 v 1 output c u rr e nt of output trans i s tor i o u t n - ch a nnel v d s =0.5v v dd = 2.4v 2.88 4.98 -- ma 3 p - c h an n el v ds = v dd - 0.5v v dd = 4.8 v 1.43 2.39 -- ma 5 dela y time td cd=4.7nf vdd=3v 6 13 20 ms 4
bui l t - in del a y circuit high - p rec i sion vo l t age detec t or ec9509c/ 08c page 4 / 10 5d15n - rev. f002 e - cmos corp. h tt p ://ww w .e c m o s.c o m .tw test circuit 1. 2. 3. 4. 5.
bui l t - in del a y circuit high - p rec i sion vo l t age detec t or ec9509c/ 08c page 5 / 10 5d15n - rev. f002 e - cmos corp. h tt p ://ww w .e c m o s.c o m .tw timing chart 1. cmos a c tive l o w ou t put 2. nch open - drain active l o w out p ut not e for v a lues of vdd less than min i mum op e rati n g v o l t age, values of o ut termi n al outp u t is free of the sh a ded r e gion.
bui l t - in del a y circuit high - p rec i sion vo l t age detec t or ec9509c/ 08c page 6 / 10 5d15n - rev. f002 e - cmos corp. h tt p ://ww w .e c m o s.c o m .tw definition of technical terms 1. detection voltage ( - v de t ) det e ction voltage - v det is a voltage at whi c h the output turns to low. this detection voltage v aries s lightly among pro d uc t s of the same sp e c i f ication. the v ariation of de t ection volta g e betwe e n the sp e c ified m i nimum [( - v d e t ) min.] and maxim u m [( - v de t ) m a x.] is called the detecti o n voltage r a nge (see fig u re a). 2. release voltage (+v de t ) rel e ase voltage + v det is a voltage at whi c h the output t urns to high. this release voltage varies s lightly among pro d uc t s of the sa m e s p ec i fication. the variation of r e lease voltage betwe e n the sp e c ified min i mum [(+v d e t ) min.] and maxim u m [(+ v de t ) m ax.] is called the rel e ase voltage ra n ge (see b). fig u re a f igure b 3. hysteresis width (v hys ) hysteres i s w i dth is the voltage diff e re nc e between t h e det e c tion v oltage a nd the rel e ase vol t age. t h e existence of the hyster e s i s width avo id s malfu n cti o n ca u s ed by n oise o n input sig n al. 4. delay time (td) delay time is a time internally m easur e d from the inst a nt at which v dd pin excee d s the rele a s e voltage (+ v de t ) to the point at which t h e out p ut of the o ut pin inver t s. t he de l ay time ch a ng e s a ccordi n g to the external ca pa citor c d .
bui l t - in del a y circuit high - p rec i sion vo l t age detec t or ec9509c/ 08c page 7 / 10 5d15n - rev. f002 e - cmos corp. h tt p ://ww w .e c m o s.c o m .tw 5. short - circuit current shor t - circuit current ref e rs t o the curr e nt wh i c h flows i nstant a ne o usly at the time of detection a nd rel e ase of a voltage detector. short - c i rcuit current is large in c mo s output pro d ucts, and s m all in n chan n el open - drain output pro d uc t s . 6. oscillati o n in applicatio n s w h ere a r e sistor is co n n e c ted to the v o ltage det e c tor input as sh o wn in fig u re , taking a c m os active low p r o duct for exa m ple, the sh o rt - circuit c u rren t , which fl o ws at rele a s e w h en the output go e s from l o w to high, c a uses a voltage dr o p equal to [s h ort - circuit c u rrent] [input res i sta n ce] across the res i stor. wh e n the input voltage falls b elow the d et e ction voltage - vdet a s a result, t he ou t put voltage g oes to l o w level. in this state, the sh o rt - circuit current sto p s a nd its r e sult a nt voltage dr o p dis a pp e ars, and the out p ut goes from low to high. short - circuit current again starts flowi n g, a voltage dr o p appe a rs, a n d oscillation i s finally induced by rep e ating the pr o c e ss . follow i ng is a n example for bad imple me ntation: input voltage divid e r f or a c m os output pro du c t. standard circuit
bui l t - in del a y circuit high - p rec i sion vo l t age detec t or ec9509c/ 08c page 8 / 10 5d15n - rev. f002 e - cmos corp. h tt p ://ww w .e c m o s.c o m .tw application circuit e xamples 1. mi c ro c omputer re s et c i rcuits with the ec 9 50 9 cxx ser i es which h a s a low o p erat i ng v o ltage, a high - prec i s i o n detect i o n voltage a n d hyster e s i s ch a r a c ter i sti c , the rese t c ir c ui t s sh o wn i n figures a to b can be e asily c o nstructed. (nch o p e n - drain output pr o duc t s only) figu r es a figur e s b 2. c h a nge o f d etection volta g e in nch o pe n - drain o utput p rod u cts of the ec950 8 cxx series, det ec tion voltage can be cha n g e d usi n g r e sis t ance dividers or d i od e s as sh ow n in figures c and d. hysteres i s w i dth is also c h an g ed. figu r es c figur e s d note1: if ra and rb are l a r g e, the h y steres i s w i dth m a y a l so be la r ger t h an the va l ue gi ven b y the e q u a tion a bo v e d u e to short - circuit c u rrent ( w h i c h fl o w s s l ight l y i n a n n cha n n e l o p en - d r ain p r o du ct). note2: ra sh o u ld b e 75k ? or less to prevent oscillat i on.
ec9509c/08c_2e04n - rev. 001 bui l t - in del a y circuit high - p rec i sion vo l t age detec t or ec9509c/ 08c p ackage type : so t23 - 5 e - cmos corp. h tt p ://ww w .e c m o s.c o m .tw p age 9 /10
ec9509c/08c_2e04n - rev. 001 bui l t - in del a y circuit high - p rec i sion vo l t age detec t or ec9509c/ 08c p ackage type : so t343 e - cmos corp. page 10/10
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