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5 v low power, slew-rate limited rs-485/rs-422 transceiver adm483 rev. 0 in fo rmation furn ished by an alog d e v i c e s is believed to be accurate and reliable. how e ver, n o resp on sibili ty is assume d b y a n alog de vices fo r its use, nor for an y i n fri n geme nt s of p a t e nt s or ot h e r ri ght s o f th ird parties th at may result fro m its use . s p ecificatio n s subj ec t to ch an g e witho u t n o tice. no licen s e is g r an te d by implicati o n or ot herwi s e u n der a n y p a t e nt or p a t e nt ri ghts of analog de v i ces. trademarks an d registered tra d ema r ks are the prop erty o f their respective ow ners. one technolog y way, p.o . box 9106, norwood, ma 02062-9106, u.s.a. t e l: 781. 329. 4 700 www.analog.com fax: 781. 326. 87 03 ? 2004 analog de vices, i n c. al l r i ght s r e ser v ed . features eia rs-48 5 /rs-422-compliant data rat e s up t o 250 kbps slew-rate limit e d for low emi 100 na supply current in shut down mode low power consumption (120 a) up to 32 transc eivers on one b u s outputs high-z when disable d or powered off C7 v to +12 v b u s common-mode range thermal shut d o wn and short-circuit protection pin-compatible with max483 specified over C40c to +85 c temperature ra nge avail a ble in 8-l ead soic pack age applic ati o ns low power rs-485 applications emi sensitive s y stems dte-dce interf aces industrial cont rol packet switchi n g local area net w orks level trans l ators func tio n a l block di agram 05079-001 ro re r de di d a b gn d v cc ad m 4 8 3 fi g u r e 1 . general description the ad m 483 is a lo w p o w e r dif f er e n t i al l i ne t r an s c e i ver s u i t ab l e f o r half-d u p lex da ta comm u n ic a t io n on m u l t i p o i n t b u s tra n s- mis s io n l i n e s. i t is desig n e d fo r balan c e d da ta tr a n smis sio n , and co m p lies wi th e i a s t anda r d s rs-485 a nd rs -4 22.th e p a r t co n t a i n s a dif f er en t i a l li ne dr i v e r a n d a d i f f er en t i a l l i n e r e cei v er . b o t h sha r e t h e s a m e dif f er en t i al p i n s , wi t h e i t h e r t h e dr i v er o r t h e r e ce i v er b e i n g ena b le d a t an y g i v e n t i m e . the device has a n in p u t im p e da n c e o f 12 k?, a l lo win g u p t o 32 t r a n s c ei v e rs o n o n e b u s. si nce o n l y o n e dr i v er s h o u l d b e e n abl e d a t a n y t i m e , t h e output of a d i s a bl e d or p o we re d - d o w n dr i v er is t h r e e- st a t e d t o a v oid o v erlo adin g t h e b u s. this hig h im p e dan c e dr i v er o u t p u t is ma i n t a i n e d o v er t h e en t i r e co mm on- m o d e v o l t a g e ra n g e f r o m C7 v t o +12 v . the r e cei v er con t a i n s a fail-s a f e fe a t ur e t h a t r e su l t s in a log i c hig h ou t p u t s t a t e if t h e i n p u ts a r e un conne c t e d (f lo a t in g). the dr i v er o u t p u t s a r e sle w -r a t e limi te d to r e d u ce emi a nd da t a e r r o r s ca used b y r e f l ecti o n s f r o m im p r o p e r l y t e rm i n a t ed b u se s . e x c e ss ive p o we r diss i p a t ion c a u s e d b y b u s c o n t e n t i on or b y output s h or t i ng i s pre v e n te d b y a t h e r m a l s h ut d o w n c i rc u i t . the p a r t is f u l l y s p e c if ie d o v er t h e i n d u s t r i al te m p era t ur e ra n g e , an d i s a v ai l a bl e i n a n 8 - l e a d s o ic p a ck ag e.
adm483 rev. 0 | page 2 of 16 table of contents specifications ..................................................................................... 3 timing specifications ....................................................................... 4 absolute maximum ratings ............................................................ 5 esd caution .................................................................................. 5 pin configuration and function descriptions ............................. 6 test circ u its ....................................................................................... 7 switching characteristics ................................................................ 8 typical performance characteristics ............................................. 9 applications ..................................................................................... 11 differential data transmission ................................................ 11 cable and data rate ................................................................... 11 thermal shutdown .................................................................... 12 receiver open-circuit fail-safe ............................................... 12 outline dimensions ....................................................................... 13 ordering guide .......................................................................... 13 revision history 10/04revision 0: initial version
adm483 rev. 0 | page 3 of 16 specifications v cc = 5 v 5%, t a = t min to t max , unless otherwise noted. table 1. parameter min typ max unit test conditions/comments driver differential output voltage, v od 5 v r = , figure 3 2.0 v r = 50 ? (rs-422), figure 3 1.5 5 v r = 27 ? (rs-485), figure 3 1.5 5 v v tst = C7 v to 12 v, figure 4 ? |v od | for complementary output states 0.2 v r = 27 ? or 50 ?, figure 3 common-mode output voltage, v oc 3 v r = 27 ? or 50 ?, figure 3 ? |v oc | for complementary output states 0.2 v r = 27 ? or 50 ?, figure 3 output short-circuit current, v out = high 35 250 ma C7 v < v out < +12 v output short-circuit current, v out = low 35 250 ma C7 v < v out < +12 v driver input logic cmos input logic threshold low 0.8 v cmos input logic threshold high 2.0 v cmos logic input current (di) 2 a de input resistance to gnd 220 k? receiver differential input threshold voltage, v th C200 +200 mv C7 v < v cm < +12 v input hysteresis 70 mv v cm = 0v input resistance (a, b) 12 k? C7 v < v cm < +12 v input current (a, b) 1 ma v in = +12 v C0.8 ma v in = C7 v cmos logic input current ( re ) 2 a cmos output voltage low 0.4 v i out = 4 ma cmos output voltage high 3.5 v i out = C4 ma output short-circuit current 7 95 ma 0 v < v out < v cc three-state output leakage current 2 a 0.4 v out 2.4 v power supply current 0.1 10 a de = 0 v, re = v cc (shutdown) 120 250 a de = 0 v, re = 0 v 350 650 a de = v cc
adm483 rev. 0 | page 4 of 16 timing specifications v cc = 5 v 5%, t a = t min to t max , unless otherwise noted. table 2. parameter min typ max unit test conditions/comments driver maximum data rate 250 kbps propagation delay t plh , t phl 250 800 2000 ns r ldiff = 54 ?, c l1 = c l2 = 100 pf, figure 5 skew t skew 100 800 ns r ldiff = 54 ?, c l1 = c l2 = 100 pf, figure 5 rise/fall time t r , t f 200 2000 ns r ldiff = 54 ?, c l1 = c l2 = 100 pf, figure 5 enable time 125 2000 ns r l = 500 ?, c l = 100 pf, figure 6 disable time 125 3000 ns r l = 500 ?, c l = 15 pf, figure 6 enable time from shutdown 5000 ns r l = 500 ?, c l = 100 pf, figure 6 receiver propagation delay t plh , t phl 250 2000 ns c l = 15 pf, figure 7 differential skew t skew 100 ns c l = 15 pf, figure 7 enable time 20 50 ns r l = 1 k?, c l = 15 pf, figure 8 disable time 20 50 ns r l = 1 k?, c l = 15 pf, figure 8 enable time from shutdown 5000 ns r l = 1 k?, c l = 15 pf, figure 8 time to shutdown 1 50 330 3000 ns 1 the device is put into shutdown mode by driving re high and de low. if these inputs are in this state for less than 50 ns, the device is guaranteed not to enter shutdown mode. if the enable inputs are in this state for at least 3000 ns, the device is guaranteed to have entered shutdown m ode.
adm483 rev. 0 | page 5 of 1 6 absolute maximum ratings t a = 2 5 c , u n l e ss ot he r w i s e no t e d. ta b l e 3 . p a r a m e t e r r a t i n g v cc to gnd 6 v digital i/o voltage (de, re , di, rou t ) C0.3 v to v cc + 0.3 v driver output/ receiver inp ut voltage C9 v to +14 v operating temperature range C40c to +85c storage temperature range C65c to +125c ja thermal impedance (soic) 110c/w lead temperature soldering (10 s) 300c vapor phase (60 s) 215c infrared (15 s) 220c s t r e s s es a b o v e t h os e list e d u nde r a b s o l u te m a xi m u m r a t i n g s ma y ca us e p e r m a n e n t dama ge to t h e de vi ce. t h is is a st r e ss r a t i ng on ly ; f u n c t i on a l op e r at i o n of t h e d e v i c e a t t h e s e or an y o t h e r con d i t ions a b o v e t h o s e i ndic a te d i n t h e op er a t io na l s e c t io n o f t h is sp e c if ic a t io n is no t im pl ie d . e x p o sur e t o a b s o l u te max i m u m r a t i ng co ndi t i on s fo r ex tende d p e r i o d s ma y a f fe c t de vice rel i a b i l i t y . esd c a ution esd (electrostatic discharge) sensitive device. ele c tros tatic charg e s as high as 4000 v readily accumulate on the human body and test eq uipment and can discharge wi thout detection. although this product features proprietary esd protection circu i try, permanent dama ge may occur on devices subjected to high energy electrostatic discharges. theref ore, prop er esd precautions a r e recommended to avoid perform a nce degradation or l o ss of functiona l ity.
adm483 rev. 0 | page 6 of 1 6 pin conf iguration and fu nction descriptions ro 1 re 2 de 3 di 4 v cc 8 b 7 a 6 gnd 5 adm483 top view (not to scale) 05079-002 f i gure 2. pin config ur ation ta b l e 4 . pi n f u nc t i o n d e s c ri pt i o ns pin o. nemonic description 1 r o receiver output. when enabled, if a > b by 200 mv, then ro = high. if a < b by 200 mv, then ro = low. 2 re receiver output enable. a lo w le vel enables the receiver output, ro. a high level p l a c es it in a high i m pedance state . 3 d e driver output enable. a high le vel ena b les the driver differenti a l inputs a and b. a low leve l pl ac es it in a high im ped a nce state. 4 d i driver input. when the driver is enabled, a logic low o n di forces a low and b hig h , while a logic hig h on di forces a high and b low. 5 g n d g r o u n d . 6 a noninverting receiver input a/ driver output a. 7 b inverting receiver input b/ driver output b. 8 v cc 5 v power supply.
adm483 rev. 0 | page 7 of 1 6 test circuits 05079-003 v od r r v oc f i gure 3. d r iver v o l t age me asurem ent 05079-004 v od3 60 ? 37 5 ? 37 5 ? v tst f i gure 4. d r iver v o l t age me asurem ent o v er co m m on-m o d e v o ltage rang e 05079-005 c l1 c l2 r ldiff a b f i g u re 5. d r iver p r o p ag at i o n d e l a y 05079-006 r l v cc s2 v out de in 0v or 3v de s1 b a c l f i g u re 6. d r iver e n abl e /d is abl e 05079-007 re b a c l v out f i gure 7. r eceive r pr op agati o n d e l a y re 05079-008 r l v cc s2 v out s1 c l +1.5v ?1.5v re in f i gure 8. r eceive r e n abl e /d isab le
adm483 rev. 0 | page 8 of 1 6 switching characteristics 05079-009 3 v 0 v 5 v 0 v a b vo t r t f t plh t phl 90% point 10% point 90% point 10% point t skew = |t plh ? t phl | 1/2vo 1.5v 1.5v f i g u re 9. d r iver p r o p ag at i o n d e l a y , r i s e /f a ll ti mi ng 05079-010 t skew = |t plh ? t phl | 1.5v 1.5v t plh t phl ro v oh 0v a, b 0v v ol f i g u re 10. r e c e iver p r op ag at ion d e l a y 05079-011 a, b a, b de 3v 0v 0v v oh v ol 1.5v t lz t zl 1.5v t hz t zh 2.3v 2.3v v ol +0.5v v oh ?0.5v f i g u re 11. d r iver e n abl e /d is abl e ti min g 05079-012 r r re 3v 0v 0v v oh v ol 1.5v t lz t zl 1.5v t hz t zh 1.5v 1.5v v ol +0.5v v oh ?0.5v o/p high o/p low f i g u re 12. r e c e iver e n able /d is abl e ti ming
adm483 rev. 0 | page 9 of 1 6 typical perf orm ance cha r acte ristics 40 0 0 50 10 0 15 0 20 0 25 0 30 0 35 0 ? 5 0 ? 2 5 0 2 55 07 5 1 0 0 1 2 5 05079-013 t emper a t u r e ( c ) unloade d s u p p l y curre nt ( a) de = v cc de = g n d f i gure 13. sup p l y current v s . t e mper at ur e 05079-014 50 0 5 10 15 20 25 30 35 40 45 0 0 .2 0 . 4 0 .6 0 . 8 1 .0 1 . 2 1 . 4 1 . 6 1 .8 2 . 0 r e c e i v er o u t p u t l o w v o l t a g e (v) re ce iv e r outp ut curre nt (ma) f i gure 14. o u tput current v s . r e c e ive r o u tput l o w v o lt ag e 05079-015 5 0 ?5 ?1 0 ?1 5 ?2 0 3. 5 4 . 0 4. 5 5 . 0 5. 5 r e c e i v er o u t p u t h i g h vo l t a g e (v) re ce iv e r outp ut curre nt (ma) f i gure 15. o u tput current v s . r e c e ive r o u tput high v o lt a g e 05079-016 0. 4 0 0. 1 5 0. 2 0 0. 2 5 0. 3 0 0. 3 5 ?5 0 ? 2 5 0 2 5 5 0 7 5 1 0 0 1 2 5 t emper a t u r e ( c) output low voltage (v) f i gure 16. r e c e iver o u tput l o w v o lt ag e v s . t e mper ature 05079-017 4. 6 4. 0 4. 1 4. 2 4. 3 4. 4 4. 5 ? 5 0 ? 2 5 0 2 55 07 5 1 0 0 1 2 5 t emper a t u r e ( c) output high voltage ( v ) f i gure 17. r e c e iver o u tput high v o lt a g e v s . t e mper ature 05079-018 90 0 10 20 30 40 50 60 70 80 0 0 .5 1 . 0 1 . 5 2 . 0 2 .5 3 . 0 3 .5 4 . 0 4 .5 5 . 0 d i f f er en t i a l o u t p u t vo l t a g e (v) driv e r outp ut curre nt (ma) f i gure 18. d r iver o u tput current vs . diffe r e ntia l output v o l t a g e
adm483 rev. 0 | page 10 of 16 05079-019 12 0 10 0 80 60 40 20 0 0 0 .5 1 . 0 1 . 5 2 . 0 2 .5 3 . 0 3 .5 4 . 0 4 .5 5 . 0 ou tp u t v o lt a g e ( v ) outp ut curre nt (ma) f i gure 19. o u tput current v s . d r ive r o u t p ut l o w v o lt ag e 05079-020 ?10 ?30 ?50 ?70 ?90 ?1 1 0 0 0 .5 1 . 0 1 .5 2 . 0 2 . 5 3 . 0 3 .5 4 . 0 4 .5 5 . 0 ou t p u t v o lta ge ( v ) outp ut curre nt (ma) f i gure 20. o u tput current v s . d r ive r o u t p ut hig h v o lt ag e 05079-021 45 0 0 50 10 0 15 0 20 0 25 0 30 0 35 0 40 0 ? 5 0 ? 2 5 0 2 55 07 5 1 0 0 1 2 5 t emper a t u r e ( c ) p r op agation de lay (ns ) f i g u re 21. d r iver propag at io n d e lay v s . t e mper at ure 05079-022 80 0 70 0 60 0 50 0 40 0 30 0 20 0 10 0 0 ? 5 0 ? 2 5 0 25 50 75 10 0 1 2 5 t emper a t u r e ( c ) p r op agation de lay (ns ) f i g u re 22. r e c e iver p r op ag at ion d e l a y v s . t e mper at ur e 05079-023 ch 1 1 . 0 0v ? b w ch 2 1 . 0 0 v ? b w m4 0 0 n s c h 3 2 . 0 0 v ch 3 2.0 0 v ? b w ch 4 5 . 0 0 v ? 3 2 4 f i g u re 23. d r iver/r ec e i ver pr op ag at io n d e l a y
adm483 rev. 0 | page 11 of 16 appli c ations differential d a t a tr ansmission dif f e r e n t i a l d a ta t r a n smis sio n is us e d to r e li a b l y t r a n smi t d a t a a t h i g h ra t e s o v er lo n g dis t a n ces a n d t h r o ug h n o isy en v i r o nm en ts. dif f e r e n t i a l t r a n smis sio n n u l l if ies t h e ef f e c t s o f gr o u n d s h ifts a n d n o ise sign al s t h a t a p p e a r a s co mm o n - mo de v o l t a g es o n t h e lin e . th er e a r e t w o ma in s t a n da r d s a p p r o v ed b y th e el ectr o n ics i n d u s t rie s a s socia t io n (e i a ), whic h s p ecif y th e e l ec tri c al c h a r ac t e ri s t i c s o f tra n scei v e r s u s ed in d i ff e r e n tial da ta tr a n s m i s s i o n . th e rs-422 s t a n d a r d s p ecif ies d a t a ra t e s u p t o 10 mb a u d a n d lin e len g t h s u p to 4000 ft. a sin g le driv er c a n dr iv e a t r a n smis sio n lin e wi t h u p t o 1 0 r e ceiv er s. t o ac hiev e tr ue m u l t i p o i n t co mm unica t io n s , t h e rs-485 st anda r d wa s de f i n e d . this st anda r d m e ets o r e x ce e d s a l l t h e r e q u ir emen ts o f rs-422, b u t als o al lo ws u p t o 32 dr i v ers an d 32 re c e iv e r s to b e c o n n e c te d to a s i ng l e b u s . a n e x t e nde d c o m m on - m o de r a n g e o f C7 v to +12 v is def i ne d . t h e m o st sig n if ican t dif f er en ce between rs-422 and rs-485 is tha t t h e dr i v ers ma y be dis a b l e d , al lo win g u p t o 32 to be co nn ec ted t o a sin g le l i n e . onl y o n e dr i v er s h o u l d b e enabled a t a time , b u t the rs-485 st anda r d con t a i n s ad di t i o n a l sp e c if ica t ion s t o g u a r a n t e e d e v i ce sa f e t y i n t h e ev en t o f l i n e co n t en ti o n . t a ble 5. comp ar ison of r s - 422 and rs-48 5 inte rf ace standards s p e c i f i c a t i o n r s - 4 2 2 r s - 4 8 5 transmission type differential differential maximum cable length 4000 ft. 4000 ft. minimum driver output voltage 2 v 1.5 v driver load impedance 100 ? 54 ? receiver input resistanc e 4 k? min 12 k? min receiver input sensitivity 200 mv 200 mv receiver input voltage range C7 v to +7 v C7 v to +12 v drivers/recei ver s per line 1/10 32/32 ca b l e a n d d a t a ra t e th e p r ef er r e d tra n smis sio n lin e f o r rs-485 co mm un ic a t io n s is a t w iste d p a ir . t w iste d p a i r c a ble t e nds to c a nc el c o m m o n - mo de n o ise a n d t h e ma gn et ic f i e l d s g e n e ra t e d b y t h e cur r en t f l o w in g t h r o ugh e a ch wir e , t h er e b y r e d u cin g t h e ef f e c t iv e i n du c t anc e of t h e p a i r . th e ad m483 i s desig n e d f o r b i dir e ct io n a l da t a co mm unic a - t i ons on mu l t ip o i n t t r ans m i s s i on l i ne s . a t y pi c a l a p p l i c a t i o n s h o w i n g a mu lt ip oi n t t r ans m i s s i on ne t w or k i s s h o w n i n fi g u r e 2 4 . a n r s -485 t r a n smis sio n lin e c a n h a v e a s ma n y a s 32 t r a n sceiv e r s o n t h e b u s. onl y o n e dr iv er c a n t r a n smi t a t a p a r t icu l a r t i m e , b u t m u l t i p le r e ce iv er s c a n b e en a b le d s i m u l - ta n e o u s l y . a s wi th a n y tr a n s m i s s i o n l i n e , i t i s im p o r t a n t t o min i mize r e f l ec tio n s. thi s c a n b e do n e b y t e rmin a t i n g th e ext r eme en d s o f t h e lin e b y usin g r e sis t o r s e q u a l t o t h e ch a r - a c te r i st i c i m p e d a nc e of t h e l i ne. stub l e ngt h s of t h e ma i n lin e s h o u ld al s o b e k e p t a s s h o r t a s p o s s ib le . a p r o p er l y termin a t e d t r a n smis sio n l i n e a p p e a r s p u r e l y r e sis t i v e to th e d r i v e r . 05079-024 ro re de di d r a b maximum number of transceivers on bus: 32 adm483 ro re de di d r a b adm483 r adm483 d ro re de di ab r adm483 d ro re de di ab f i g u re 24. t y pic a l h a lf -d upl e x rs-485 net w o r k t o po lo gy
adm483 rev. 0 | page 12 of 16 thermal shutdown the adm483 contains thermal shutdown circuitry that protects the part from excessive power dissipation during fault conditions. shorting the driver outputs to a low impedance source can result in high driver currents. the thermal sensing circuitry detects the increase in die temp- erature and disables the driver outputs. the thermal sensing circuitry is designed to disable the driver outputs when a die temperature of 150c is reached. as the device cools, the drivers are re-enabled at 140c. receiver open-circuit fail-safe the receiver input includes a fail-safe feature that guarantees a logic high on the receiver when the inputs are open circuit or floating.
adm483 rev. 0 | page 13 of 16 outline dimensions 0.25 (0.0098) 0.17 (0.0067) 1.27 (0.0500) 0.40 (0.0157) 0.50 (0.0196) 0.25 (0.0099) 45 8 0 1.75 (0.0688) 1.35 (0.0532) seating plane 0.25 (0.0098) 0.10 (0.0040) 4 1 85 5 . 00 ( 0 . 196 8) 4 . 80 ( 0 . 189 0) 4.00 (0.1574) 3.80 (0.1497) 1.27 (0.0500) bsc 6.20 (0.2440) 5.80 (0.2284) 0.51 (0.0201) 0.31 (0.0122) coplanarity 0.10 controlling dimensions are in millimeters; inch dimensions (in parentheses) are rounded-off millimeter equivalents for reference only and are not appropriate for use in design compliant to jedec standards ms-012aa f i g u re 25. 8-l e ad s t anda r d s m a l l o u t l ine p a ckag e [soic ] (r -8) di me nsio ns sho w n i n mi ll im e t e r s a n d (i nc he s) ordering guide model temperature r a nge package descri ption package option adm483ar C40c to +85c 8-lead st andard small outline package r-8 adm483ar- ree l C40c to +85c 8-lead standard small outline package r-8 adm483ar- ree l 7 C40c to +85c 8-lead standard small outline package r-8 adm483jr 0c to 70c 8-lead stan dard small outline package r-8 adm483jr-ree l 0c to 70c 8-lead st andard small outline package r-8 adm483jr-ree l 7 0c to 70c 8-lead st andard small outline package r-8
adm483 rev. 0 | page 14 of 16 notes
adm483 rev. 0 | page 15 of 16 notes
adm483 rev. 0 | page 16 of 16 notes ? 2004 analo g de vices, inc. all rights reserve d . tra d em arks and registered tra d ema r ks are the prop erty of their respective owners . d05079-0-10/04(0)

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