technical data in74hc244a octal 3-state noninverting buffer/line driver/line receiver high-performance silicon-gate cmos ordering information in74hc 244an pl ast i c in74hc 244adw soic t a = -55 t o 125 c for all packages the in74hc 244a i s i d ent i cal i n pi nout t o t h e ls/ a ls244. 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 resistors, they are com p a tible with ls/alsttl outputs. this octal noninverting buffer/line dr iver/line receiver is designed to be used wi t h 3-st at e m e m o ry address dri v ers, cl ock dri v ers, and ot her bus-ori ent e d sy st em s. the devi ce has noni nvert i ng out put s and t w o active-low output enables. ? outputs directly interf ace to cmos, nmos, and ttl ? operat i ng vol t a ge r a nge: 2.0 t o 6.0 v ? low input c u rrent : 1.0 a ? high noise im m unity characteristic of cmos devices pin assignment logic diagram pin 20=v cc pin 10 = gnd function table input s o u t put s enable a, enable b a , b y a , y b l l l l h h h x z x=don?t care z = hi gh i m pedance rev. 00
in74hc244a 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 20 ma i out dc out put c u rrent , per pi n 35 ma i cc dc suppl y c u rrent , v cc and gnd pins 75 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. +derat i ng - pl ast i c 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) 2.0 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 t r , t f input r i se and fal l ti m e (fi gure 1) v cc =2.0 v v cc =4.5 v v cc =6.0 v 0 0 0 1000 500 400 ns 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
in74hc244a dc electrical characteristics (voltages referenced to gnd) v cc guaranteed lim it sy m bol p a r a m e t e r test c ondi t i o n s v 25 c to -55 c 85 c 125 c unit v ih m i ni m u m hi gh- level input vol t a ge v out = 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 il m a x i mu m l o w - level input vol t a ge v out =0.1 v ? i out ? 20 a 2.0 4.5 6.0 0.5 1.35 1.8 0.5 1.35 1.8 0.5 1.35 1.8 v v oh m i ni m u m hi gh- level out put vol t a ge v in =v ih ? 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 v in =v ih ? i out ? 6.0 m a ? i out ? 7.8 m a 4.5 6.0 3.98 5.48 3.84 5.34 3.7 5.2 v ol m a x i mu m l o w - level out put vol t a ge v in = 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 v in = v il ? i out ? 6.0 m a ? i out ? 7.8 m a 4.5 6.0 0.26 0.26 0.33 0.33 0.4 0.4 i in m a xi m u m input leakage current v in =v cc or gnd 6.0 0.1 1.0 1.0 a i oz m a x i mu m t h r e e - state leakage current out put i n hi gh-im pedance state v in = v il or v ih v out =v cc or gnd 6.0 0.5 5.0 10.0 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) v in =v cc or gnd i out =0 a 6 . 0 4 . 0 4 0 1 6 0 a rev. 00
in74hc244a ac electrical characteristics (c l =50pf,input t r =t f =6.0 ns) v cc guaranteed lim it sym b o l p a r a m e t e r v 25 c to -55 c 85 c 125 c unit t plh , t phl m a xi m u m propagat i on del a y , a t o ya or b t o yb (fi gures 1 and 3) 2.0 4.5 6.0 96 18 15 115 23 20 135 27 23 ns t plz , t phz m a xi m u m propagat i on del a y , out put enabl e t o ya or yb (fi gures 2 and 4) 2.0 4.5 6.0 110 22 19 140 28 24 165 33 28 ns t pzl , t pzh m a xi m u m propagat i on del a y , out put enabl e t o ya or yb (fi gures 2 and 4) 2.0 4.5 6.0 110 22 19 140 28 24 165 33 28 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 1 and 3) 2.0 4.5 6.0 60 12 10 75 15 13 90 18 15 ns c in m a xi m u m input c a paci t a nce - 10 10 10 pf c out maxim u m three-state output capacitance (out put i n hi gh-im pedance st at e) - 1 5 1 5 1 5 p f power dissipation capacitance (per buffer) typical @25 c,v cc =5.0 v c pd used t o det e rm i n e t h e no-l o ad dy nam i c power consum pt i on: p d =c pd v cc 2 f+i cc v cc 3 4 p f fi gure 1. sw i t chi n g waveforms fi gure 2. sw i t chi n g waveforms figure 3. test circuit figure 4. test circuit rev. 00
in74hc244a expanded logic diagram (1/8 of the device) rev. 00
in74hc244a n s u f f i x p l as t i c d i p (m s - 0 0 1 a d) sy m b o l m i n m a x a 24. 8 9 26. 92 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 3 a c) sy m b o l m i n m a x a 12. 6 1 3 b 7. 4 7 . 6 c 2. 35 2. 65 d 0. 33 0. 51 f 0. 4 1 . 2 7 g h no t e s : j 0 8 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 pr o t r u s i on . k 0. 1 0 . 3 2. m a x i m u m m o l d fl a s h o r p r o t ru s i o n 0 . 1 5 m m (0 . 0 0 6 ) p e r s i d e m 0. 23 0. 32 f o r a ; fo r b ? 0. 25 m m ( 0 . 010) p e r s i d e . p 10 10. 65 r 0. 25 0. 75 d i me n s i o n , mm 1. 27 9. 53 d i me n s i o n , mm 2. 54 7. 62 a b h c k c m j f m p g d r x 4 5 se a t i n g pl a n e 0.2 5 ( 0 . 0 1 0 ) m t -t - 1 20 10 11 l h m j a b f g d se a t i n g pl an e n k 0.2 5 ( 0 . 010) m t -t - c 1 20 10 11 rev. 00
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