technical data in74hc221a dual monostable multivibrator n su ff i x pl a s t i c d su ff i x s o i c 1 16 1 16 ordering information IN74HC221AN plastic in74hc221ad soic t a = -55 t o 125 c for all packages the in74hc 221a i s i d ent i cal i n pi nout t o t h e ls/ a ls221. the devi ce i nput s are com p at i b l e wi t h st andard c m os out put s; wi t h pul l up resi st ors, they are com p atible with ls/alsttl outputs. there are t w o t r i gger i nput s, a input (negat i v e edge) and b input (positive edge). these inputs are valid for rising/falling signals the device m a y also be triggered by using the reset input (positive- edge) because of the schm itt-trigge r input; after triggering the output m a intains the m onostable state for the tim e period determ ined by the external resistor r ext and capacitor c ext . taki ng r e set l o w breaks t h i s m onostable state. if the next tr igger pulse occurs during the m onostable peri od i t m a kes t h e m onostable peri od l onger. ? outputs directly interf ace to cmos, nmos, and ttl ? operat i ng vol t a ge r a nge: 3.0 t o 6.0 v ? low input c u rrent : 1.0 a ? high noise im m unity characteristic of cmos devices logic diagram pin 16 =v cc pin 8 = gnd function table input s o u t put s not e a b r e s e t q q h h out put enable x l h l * h * inhi bi t h x h l * h * inhi bi t l h o u t p u t enable l h out put enable x x l l h inhi bi t x = don?t care * - except for m onost a bl e peri od pin assignment note (1) c ext , r ext , d ext are ext e rnal com ponent s. (2) d ext i s a cl am pi ng di ode. the external capacitor is charged to v cc i n t h e st and-by st at e, i . e. no t r i gger. w h en t h e suppl y vol t a ge i s t u rned off c x is discharged m a inly through an internal parasitic diode. if c x is su fficien tly larg e an d v cc decreases rapidy, there will b e so m e p o ssib ility o f d a m a g i n g th e i.c. with a su rg e current or latch-up. if the voltage supply filter capacitor is l a rge enough and v cc decrease slowly, the surge current is au to m a tically lim ited an d d a m a g e th e i.c. is av o i d e d . th e m a x i m u m fo rward cu rren t o f th e p a rasitic d i o d e is approxi m a t e l y 20 m a . c ex t r ex t d ex t c ext r ex t d ext 1 2 3 5 4 6 7 8 16 15 14 13 12 11 10 9 gnd v cc 1r / c ext e xt 1c ext 1q 2q 2 r es et 2b 2a 1a 1b 1 r es et 1q 2q 2c ext 2r / c ex t e x t rev. 00
in74hc221a maximum ratings * sym b o l p a r a m e t e r valu e un i t v cc dc suppl y vol t a ge (referenced t o gnd) -0.5 t o +7.0 v v in dc input vol t a ge (referenced t o gnd) -1.5 t o v cc +1.5 v v out dc output voltage (referenced to gnd) -0.5 to v cc +0.5 v i in dc input c u rrent , per pi n a, b , r e set c ext , r ext 20 30 ma i out dc out put c u rrent , per pi n 25 ma i cc dc suppl y c u rrent , v cc and gnd pins 50 ma p d po wer dissip a tio n in still air, plastic dip ** soic package ** 750 500 mw tst g st orage tem p erat ure -65 t o +150 c t l lead tem p erat ure, 1 m m from c a se for 10 seconds (plastic dip or soic package) 260 c * m a xi m u m r a t i ngs are t hose val u es bey ond whi c h dam a ge t o t h e devi ce m a y occur. functional operation should be restricted to the reco m m e nded operating conditions. ** derating - plastic dip: - 10 m w / c from 65 t o 125 c soic package: : - 7 m w / c from 65 t o 125 c recommended operating conditions sy m bol p a r a m e t e r m i n m a x uni t v cc dc suppl y vol t a ge (referenced t o gnd) 3.0 * 6 . 0 v v in , v out dc input vol t a ge, out put vol t a ge (referenced t o gnd) 0 v cc v t a operat i ng tem p erat ure, al l package ty pes -55 +125 c input r i se and fal l ti m e - r e set (fi gure 2) v cc =2.0 v v cc =4.5 v v cc =6.0 v 0 0 0 1000 500 400 t r , t f a or b - no lim it ns r x ext e rnal ti m i ng r e si st or v cc <4.5 v v cc 4.5 v 10 2.0 1000 1000 k ? c x ex tern al tim i n g cap acito r 0 no lim it f * the in74hc221a will function at 2.0 v but for optim um pulse width stability, v cc shoul d be above 3.0 v. thi s devi ce cont ai ns prot ect i on ci rcui t r y t o guard agai ns t dam a ge due t o hi gh st at i c vol t a ges or el ect ri c fi el ds. however, precautions m u st be taken to avoid applications of any voltage highe r than m a xim u m rated voltages to this hi gh-i m pedance ci rcui t . for proper operat i on, v in and v out shoul d be const r ai ned t o t h e range gnd (v in or v out ) v cc . unused i nput s m u st al way s be t i e d t o an appropri a t e l ogi c vol t a ge l e vel (e.g., ei t h er gnd or v cc ). unused out put s m u st be l e ft open. rev. 00
in74hc221a dc electrical characteristics (voltages referenced to gnd) guaranteed lim it sy m bol p a r a m e t e r test c ondi t i o n s v cc v -55 c to 25 c 85 c 125 c un it v il m a x i mu m l o w - l e v e l input vol t a ge v out 0.1 v or v cc =0.1 v ? i out ? 20 a 2.0 4.5 6.0 0.3 0.9 1.2 0.3 0.9 1.2 0.3 0.9 1.2 v v ih m i ni m u m hi gh-level input vol t a ge v out 0.1 v or v cc =0.1 v ? i out ? 20 a 2.0 4.5 6.0 1.5 3.15 4.2 1.5 3.15 4.2 1.5 3.15 4.2 v v in =v ih or v il ? i out ? 20 a 2.0 4.5 6.0 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 0.1 v in =v ih or v il ? i out ? 4.0 m a 4.5 0.26 0.33 0.4 v ol m a x i mu m l o w - l e v e l out put vol t a ge v in =v ih or v il ? i out ? 5.2 m a 6 . 0 0 . 2 6 0 . 3 3 0 . 4 0 v v in =v ih or v il ? i out ? -20 a 2.0 4.5 6.0 1.9 4.4 5.9 1.9 4.4 5.9 1.9 4.4 5.9 v in =v ih or v il ? i out ? -4.0 m a 4 . 5 3 . 9 8 3 . 8 4 3 . 7 0 v oh m i ni m u m hi gh-level out put vol t a ge v in =v ih or v il ? i out ? -5.2 m a 6 . 0 5 . 4 8 5 . 3 4 5 . 2 v i il m a x i mu m l o w - l e v e l out put c u rrent v il =gnd v ih =v cc 6 . 0 - 0 . 1 - 1 . 0 - 1 . 0 a i ih m i ni m u m hi gh-level input c u rrent v il =gnd v ih =v cc 6 . 0 0 . 1 1 . 0 1 . 0 a i cc m a x i mu m q u i e s c e n t suppl y c u rrent (per package) st andby st at e v il =gnd v i =v cc i out =0 a 6 . 0 8 . 0 8 0 1 6 0 a i cc1 m a xi m u m suppl y current (per package) active state v il =gnd v ih =v cc i out =0 a v in = 0.5 v cc 2.0 4.5 6.0 0.08 1.0 2.0 0.11 1.3 2.6 0.13 1.6 3.2 ma rev. 00
in74hc221a ac electrical characteristics guaranteed lim it sym b o l p a r a m e t e r t e s t c ondi t i ons v cc v -55 c to 2 5 c 85 c 125 c un it a, b - q 2.0 4.5 6.0 180 36 31 225 45 38 270 54 46 reset - q 2.0 4.5 6.0 180 36 31 225 45 38 270 54 46 t phl m a x i mu m propagat i on delay reset - q v il =0 v v ih =v cc t lh =t hl =6 ns c l =50 pf c ext =0 r ext =5 k ? 2.0 4.5 6.0 195 39 33 245 49 42 295 59 50 ns a, b - q 2.0 4.5 6.0 220 44 37 275 55 47 330 66 56 reset - q 2.0 4.5 6.0 245 49 42 305 61 52 370 74 63 t plh m a x i mu m propagat i on delay reset - q v il =0 v v ih =v cc t lh =t hl =6 ns c l =50 pf c ext =0 r ext =5 k ? 2.0 4.5 6.0 200 40 34 250 50 43 300 60 51 ns t tlh , t thl m a xi m u m out put transi t i on ti m e , any out put (fi gures 2 and 3) v il =0 v v ih =v cc t lh =t hl =6 ? c l =50 pf 2.0 4.5 6.0 75 16 14 95 20 17 110 22 20 ns c in m a xi m u m input capacitance a, b, reset c x , r x - 1 0 20 10 20 10 20 pf power di ssi pat i on c a paci t a nce (per mu ltiv ib rato r) c pd p d =c pd v cc 2 f+i cc v cc 5 . 0 180 * pf t rec m i n i mu m r e c o v e r y t i me , in activ e to a o r b (fi gure 2) v il =0 v v ih =v cc t lh =t hl =6 ? c l =50 pf 2.0 4.5 6.0 100 20 17 125 25 21 150 30 26 ns a, reset 2.0 4.5 6.0 25 9 7 95 19 16 110 22 19 t w m i n i mu m p u l s e w i dt h b v il =0 v v ih =v cc t lh =t hl =6 ns c l =50 pf c ext =0 r ext =5 k ? 2.0 4.5 6.0 30 11 9 115 23 20 135 27 23 ns ext =0 r ext =5 k ? 5.0 105 * ns ext =1 nf r ext =10 k ? 2.0 4.5 6.0 0.80 * 0.75 * 0.70 * t wq m i ni m u m pul s e w i dt h (fi gure 4) ext =1 f r ext =10 k ? 2.0 4.5 6.0 80 * 75 * 70 * s * =2510 c rev. 00
in74hc221a fi gure 1. sw i t chi n g waveforms r e set fi gure 2. sw i t chi n g waveforms figure 3. test circuit rev. 00
in74hc221a timing diagram r/ c e x t ext expanded logic diagram r/ c e x t ext c ex t rev. 00
in74hc221a n s u f f i x p l as t i c di p (m s - 0 0 1 b b ) sy m b o l m i n m a x a 18. 67 19. 69 b 6. 1 7 . 1 1 c 5. 33 d 0. 36 0. 56 f 1. 14 1. 78 g h j 0 10 k 2. 92 3. 81 no t e s : l 7. 62 8. 26 1. d i m e n s i o n s ?a ?, ?b ? d o n o t i n cl u d e m o l d f l as h o r p r o t r u s i o n s . m 0. 2 0 . 3 6 m a x i m u m m o l d f l a s h o r p r o t r u s i o n s 0. 25 m m ( 0 . 010) p e r s i d e . n 0. 38 d su f f i x so i c (m s - 0 1 2 a c) sy m b o l m i n m a x a 9. 8 1 0 b 3. 8 4 c 1. 35 1. 75 d 0. 33 0. 51 f 0. 4 1 . 2 7 g h j 0 8 no t e s : k 0. 1 0 . 2 5 1. d i m e n s i o ns a a n d b d o no t i n c l ud e m o l d f l a s h o r p r ot r u s i on . m 0. 19 0. 25 2. m a x i m u m m o l d f l a s h o r p r o t r u s i o n 0. 15 m m ( 0 . 006) p e r s i d e p 5. 8 6 . 2 fo r a ; fo r b ? 0. 25 m m ( 0 . 010) p e r s i d e . r 0. 25 0. 5 5. 72 2. 54 7. 62 1. 27 d i me n s i o n , mm d i me n s i o n , mm a b h c k c m j f m p g d r x 4 5 se a t i n g pl an e 0 . 25 ( 0 . 010 ) m t -t - 1 16 8 9 l h m j a b f g d se a t i n g pl a n e n k 0. 2 5 ( 0 . 010) m t -t - c 1 16 8 9 rev. 00
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