technical data IL5851 pulse dialer with redial the IL5851 is a m onolithic cmos inte grated circuit which uses an in ex p e n s iv e rc o s cillato r fo r its freq u e n c y referen ce an d p r o v i d e s all th e feat ures requi red for i m pl em ent i ng a pul se di al er wi t h 32 di gi t redi al . ordering information IL5851n pl ast i c t a = -20 to 7 0 c ? w i de operat i ng vol t a ge range (2.0~ 6 .0v) ? low power di ssi pat i on ? use ei t h er a st andard 2 of 7 m a t r i x key board wi t h negat i v e t r ue com m on or t h e i n expensi v e form a-t y pe key board ? make/break ratio can be selected ? red i al with * or # ? c ont i nuous m u te ? power up clear circuitry on chip ? 10 pps/ 20 pps can be sel ect ed pin assignment logic diagram pin 1 = v cc pin 6 = gnd 1
IL5851 pin description nam e p i n description v cc 1 positive supply pin. the vol t a ge on t h i s pi n i s m easured rel a t i v e t o pi n 6 and i s suppl i e d from a 150 a current source. thi s vol t a ge shoul d be regul at ed t o l e ss t h an 6.0 vol t s usi ng on ext e rnal form or regul at i on. v ref 2 t h e v ref out put provi des reference v o ltag e th at track s in tern al param e t e rs of t h e IL5851n. v ref provi des a negat i v e vol t a ge reference to th e v cc supply. its m a gnitude will be approxi m a t e l y 0.6 vol t hi gher t h an t h e m i ni m u m operat i ng vol t a ge of each particular IL5851n. the t y pi cal appl i cat i on woul d be t o connect the v ref pin to the gnd pin (pi n 6). the suppl y t o t h e v cc pi n (pi n 1) shoul d t h en be regul at ed t o 150 a (i op m a x). wi t h t h i s am ount of suppl y current , operat i on of t h e IL5851n i s guarant eed. th e in tern al circu it o f th e v ref funct i on i s shown i n fi gure 1 wi t h i t s associated i-v characteristic . ___ _____ r ow1 - ro w 4, c o l 1 -c ol 4 3,4,5,13, 14,15,16 key board i nput s. the IL5851n i n corporat es an i nnovat i v e key board schem e t h at al l o ws ei t h er t h e st andard 2-of-7 key board wi t h negat i v e com m on or t h e i n expensi v e si ngl e cont act (form a) key board t o be used. a val i d key ent r y i s defi ned by ei t h er a si ngl e row bei ng connect ed t o a si ngl e colum n or gnd being sim u ltaneously pres ented to both a single row and colum n . w h en i n t h e on-hook m ode, t h e row and col u m n i nput s are hel d hi gh and no keyboard inputs are accepted. w h en off-hook, the keyboard is com p letely static until the initial valid key input is sen s ed . th e o s cillato r is th en en ab led an d th e ro ws an d co lu m n s are scan n e d al t e rnat el y (pul l e d hi gh, t h en l o w) t o veri fy t h e vari ed i nput . the i nput m u st rem a in valid for 10m sec of debounce tim e to be accepted. form a t y pe key board 2 of 7 key board (negat i v e com m on) 2 of 7 key board el ect roni c i nput g n d 6 negat i v e suppl y 2
IL5851 pi n i s connect ed t o t h e com m on part i n general appl i cat i ons. rc1 -rc3 7 , 8 , 9 oscillato r the IL5851n contains on-chip inverters to provide oscillator which will operate wi t h a m i ni m u m ext e rnal com ponent s. fol l o wi ng fi gure shows t h e on-chi p confi gurat i on wi t h t h e necessary ext e rnal com ponents. optim um stability occurs with the ration k=r s /r eq u a l to 1 0 th e o s cillato r p e rio d is g i v e n b y : t=r c ( 1.386+(3.5kc s )/c-(2k/(k+1)) in (k/(1.5k + 0.5)) w h ere c s is the stray capacitance on pin 7. accu racy an d stab ility will b e en h a n ced with th is cap acitan ce m i n i m i zed . p p s 1 0 1 0 / 2 0 p p s s e l e c t connecting this pin to gnd (pin 6) will select an output pul se rate of 10pps. c onnect i ng t h e pi n v cc (pin 1) will select an output pulse rate of 20pps. m / b 1 1 m a k e / b r e a k s e l e c t the m a ke/ b reak pi n cont rol s t h e m a ke/ b reak rat i o of t h e pul se out put . the m a ke/ b reak rat i o i s cont rol l e d by connect i on v cc or gnd to this pin as shown in th e fo llo win g tab l e. input m a k e b r e a k v cc (pi n 1 ) 3 3 . 4 % 6 6 . 6 % g n d ( p i n 6 ) 4 0 % 6 0 % ____ mu te 1 2 m u t e out put the m u t e out put i s an open-drai n n-c h annel t r ansi st or desi gned t o dri v e ext e rnal bi pol ar t r ansi st or. th is circu itry is u s u a lly used to m u te the receiver duri ng outpulsing. as shown in fi g. 2 t h e IL5851n m u t e out put t u rns on (pul l s t o t h e v gnd -suppl y ) at t h e begi nni ng of t h e predi g i t a l pause and t u rns off (goes t o an open ci rcui t ) fol l o wi ng the last break. th e d e lay fro m th e en d o f th e last b r eak u n til th e m u te o u t p u t tu rn s o ff is m u te overlap and is specified as t mo . o h 1 7 o n - h o o k / t e s t thi s pi n det ect s t h e st at e of t h e hook swi t c h cont act ?off hook? corresponds to v ss condi t i on. ?n hook?corresponds t o v dd condi t i on. w h en out pul si ng i n this m ode, which can be up to 300m sec, is com p leted, the circ uit is deactivated and will require current only necessary to sustain the m e m o ry and power-up-clear detect circuitry (refer to th e electrical specifications). upon retuning off-hook, a negative transis tion on the m u te output will insure the speech network is connected to the line. if the first key entr y is either a * or #, the 3
IL5851 n u m b e r seq u e n ce sto r ed o n - ch ip will b e o u t p u l sed . an y o t h e r v a lid k e y en tries will clear th e m e m o ry an d o u t p u l se th e n e w n u m b e r seq u e n ce. ______ pulse 1 8 p u l s e out put the pul s e out put i s an open drai n n-channel t r ansi st or desi gned t o dri v e ext e rnal bi pol ar t r ansi st or. these t r ansi st or woul d norm a l l y be used t o pul se t h e t e l e phone l i n e by di sconnect i ng and connect i ng t h e net w ork. the IL5851n pul se out put i s an open ci rcui t duri ng m a ke and pul l s t o t h e gnd suppl y duri ng break. 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) -0.3 t o +6.2 v v in dc input vol t a ge (referenced t o gnd) -0.3 t o v cc +0.3 v p d po wer dissip a tio n in still air ** 5 0 0 m w tst g st orage tem p erat ure -40 t o +125 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: -10 mw / c from 65 c to 7 0 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 dc input vol t a ge (referenced t o gnd) 0 v cc v t a operat i ng tem p erat ure -20 +70 c 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. 4
IL5851 dc electrical characteristics (voltages referenced to gnd, v cc = 2.0 v t o 6.0v, t a = -20 to +70 c, f osc =2.4khz) g u a r a n t e e d lim i t s sy m bol p a r a m e t e r test c ondi t i o n s m i n ty p m a x uni t v ih input hi gh vol t a ge 0.8v cc v cc v v il input low vol t a ge 0 0.2v cc v v dr m i n i mu m m e mo r y reten tio n vo ltag e 1 . 0 v i ol output leakage current v cc = 6. 0v , mute,pulse=6.0v 1 a i ol1 m i ni m u m out put c urrent ______ (mute,pulse) v o =0.8v,v cc = 2 . 5 v 0 . 5 m a i ol2 m i ni m u m out put c urrent ______ (mute,pulse) v o =0.8v,v cc = 3 . 5 v 1 . 7 m a i od operat i ng c u rrent al l out put under no l o ad, v cc =2.0v 1 5 0 a i sd m a xi m u m st andby current v cc =2.5v v ih =2.5v 1 a i ref m i n i mu m r e f e r e n c e current v cc = 6 . 0 v 1 a ac electrical characteristics (f osc = 2.4 khz, v cc =2.0 to 6.0 v, t a =-20 to +70 c ) sym b o l param e ter test co n d itio n s gu aran teed lim it un it m i n . ty p . m a x t kd m i n i mu m v a l i d k e y en tr y tim e 2 0 m s t oh on hook ti m e r e qui red t o clear mem o ry (fi gure 2) 3 0 0 m s t idr in ter dig ital pause (fi gure 2) 8 0 0 m s ? f frequency sab ility 10 % t mo recov ery tim e , mute to pulse (fi gure 2) 8 0 0 m s t pdp m a x i mu m p r e - d i g ital pau s e (fi gure 2) 3 0 m s t dp m a x i mu m d e l a y ti me , k e y input to pulse (fi gure 2) 5 0 m s m / b m a ke/ b r e a k 1/ 2 m / b = v cc r a t i o 2 / 3 m / b = g n d 5
IL5851 timing diagramm fi gure 2 6
IL5851 n s u f f i x p l as t i c di p (m s - 0 0 1 a c ) sy m b o l m i n m a x a 22. 35 23. 37 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 2. 54 7. 62 d i me n s i o n , mm l h m j a b f g d se a t i n g pl an e n k 0.2 5 ( 0 . 0 10 ) m t -t - c 1 18 9 10 7
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