technical data in74hc21a dual 4-input and gate ordering information in74hc 21an pl ast i c in74hc 21ad soic t a = -55 t o 125 c for all packages the in74hc 21a i s hi gh-speed si -gat e c m os devi ce and i s pi n com p atible with pullup resistors with low power schottky ttl (lsttl). the devi ce provi de t h e dual 4-i nput and funct i on. ? 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 logic diagram pin 14 =v cc pin 7 = gnd pin assignment a1 c1 y1 b1 a2 c2 d2 y2 b2 1 2 3 5 4 6 7 v c c 14 13 12 11 10 8 9 gn d a1 b1 b2 a2 y2 y1 c1 c2 d2 d1 function table input s o u t put a b d y l x x x l x l x x l x x l x l x x x l l h h h h h x = don?t care rev. 00
in74hc21a 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 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 axi m um 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
in74hc21a 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 un it v ih m i ni m u m hi gh-level input vol t a ge 2 . 0 3.0 4.5 6.0 1.5 2.1 3.15 4.2 1.5 2.1 3.15 4.2 1.5 2.1 3.15 4.2 v v il m a x i mu m l o w - l e v e l input vol t a ge 2 . 0 3.0 4.5 6.0 0.5 0.9 1.35 1.8 0.5 0.9 1.35 1.8 0.5 0.9 1.35 1.8 v v in =v ih or v il ? i out ? = -50 a 2.0 3.0 4.5 6.0 1.92 2.92 4.42 5.92 1.9 2.9 4.4 5.9 1.9 2.9 4.4 5.9 v in =v ih or v il ? i out ? = -2.4 m 3 . 0 2 . 4 8 2 . 3 4 2 . 2 v in =v ih or v il ? i out ? = -4 m 4 . 5 3 . 9 8 3 . 8 4 3 . 7 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 6 . 0 5 . 4 8 5 . 3 4 5 . 2 v v in = v ih or v il ? i out ? = 50 a 2.0 3.0 4.5 6.0 0.09 0.09 0.09 0.09 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 ? = 2.4 m 3 . 0 0 . 2 6 0 . 3 3 0 . 4 v in =v ih or v il ? i out ? = 4 m 4 . 5 0 . 2 6 0 . 3 3 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 6 . 0 0 . 2 6 0 . 3 3 0 . 4 v i il m a x i mu m l o w - l e v e l input leakage c u rrent v in = 0 v 6.0 -0.1 -1.0 -1.0 a i ih m a xi m u m hi gh-level input leakage c u rrent v in = 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 v in =v cc or 0 v 6 . 0 4 . 0 4 0 1 6 0 a rev. 00
in74hc21a 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 un it t phl , t plh m a xi m u m propagat i on del a y (fi gure 1) 2.0 4.5 6.0 110 22 19 140 28 24 165 33 28 ns t thl , t tlh m a xi m u m out put transi t i on ti m e (fi gure 1) 2.0 4.5 6.0 75 15 13 95 19 16 110 22 19 ns c in m a xi m u m input c a paci t a nce 5.0 10 10 10 pf power di ssi pat i on c a paci t a nce (per gat e ) t a =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 5 0 p f 0. 1 0.1 0.9 0. 9 v 2 v 2 v 1 t phl t hl t pl h t lh gnd v 2 v 2 v = 0. 5 v 1 c c in p u t ou t p u t 0. 1 0.1 0. 9 0.9 t thl t tl h 0 v v cc fi gure 1. swi t c hi ng w a veform s pu l s e g e ne ra t o r d evi c e unde r te s t v cc v i v o c 50 pf l r t termination resistance r t ? should be equal to z out of pulse generators fi gure 2. test c i rcui t rev. 00
in74hc21a n s u f f i x p l as t i c di p (m s - 0 0 1 a a ) 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 b ) sy m b o l m i n m a x a 8. 55 8. 75 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 d i me n s i o n , mm 1. 27 5. 27 2. 54 7. 62 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 0.2 5 ( 0 . 0 10 ) m t -t - 1 14 7 8 a b f g d l h se a t i n g pl a n e n k 0.25 ( 0 . 010) m t m j -t - c 1 14 7 8 rev. 00
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