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| 3.3v slew rate limited, half and full duplex prelim inary technical data adm3483/adm3485/adm3488/adm3490 rev. pr d 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 proper ty of th eir respectiv e co mpan ies. 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 ? 2005 analog de vices, i n c. al l r i ght s r e ser v ed . features eia rs -485/rs - 422 c o mpliant da ta r a t e o p tions adm348 3, a d m 3488 C 250k b p s adm348 5, a d m 3490 C 10mb p s half an d f u ll d u ple x o p tions reduc e d sl e w r a tes f o r low emi 2na sup p ly c u rrent in shu t down mo de ( adm34 83,a d m 3485) up to 32 t r ansceiv e rs on a bu s -7v to +12 v b u s c o mmo n mode r a nge specified ov er C40c t o +85 c t e mper a t ur e r a nge a v ai lable in 8-lead soic adm348 3/85 a v ailable in an 8 - lead lfcsp p a ck age applic ation s l o w-p o w e r rs - 485 a p plic a t ions emi s e nsitiv e s y st ems d t e-dc e in t e r f ac es industrial c o n t r o l p a ck et s w it ching loc a l a r ea net w orks lev e l t r ans l ato r s general de scription the ad m3483, ad m3485, ad m3488 a nd ad m3490 a r e 3.3v , lo w-p o w e r tra n s c ei v e rs f o r rs-485 a nd rs-422 co mm unica t ion. e a c h p a r t co n t ain s on e dr i v er and o n e r e cei v er . the ad m3483 a nd ad m3488 f e a t ur e s l ew-ra t e-limi t e d dr i v ers tha t minimize emi a nd r e d u ce r e f l ec tio n s ca us ed b y im p r o p erly t e r m ina t e d ca b l es, al lo win g er r o r - f r e e da t a t r a n smis sio n a t da ta r a t e s u p t o 250k b p s. the p a r t ial l y s l ew-ra t e-limi t e d max3486 tra n smi t s u p t o 2.5mb p s. the ad m3485 and ad m3490 tran smi t a t u p t o 10mb p s. the dr i v ers a r e s h o r t-cir c ui t c u r r en t limi te d and a r e p r o t e c te d a g a i n s t exces s i v e p o w e r dis s i p a t io n b y t h er mal sh u t down ci r c ui tr y th a t p l a c e s th e d r i v e r o u t p u t s i n t o a hi gh - i m p e d a n ce s t a t e . th e r e ce i v er in p u t has a fai l -s a f e fe a t ur e t h a t gua r an te es a log i c-hig h o u t p u t if bo t h in p u ts a r e o p en cir c ui t. th e ad m348 8 a nd ad m3490 f e a t ur e f u l l d u p l ex co mm unica t io n, while t h e ad m3483 an d ad m3485 a r e desig n e d f o r half-d u p lex co mm unic a t io n. the dr i v er o u t p u t s a r e s l ew ra te limi t e d in o r der t o r e d u ce em i an d d a t a e r ror s c a u s e d by re f l e c t i ons f r om i m prop e r ly t e r m i n at e d bu s e s . e x c e s s i v e p o w e r d i s s ip a t i o n c a u s e d by bu s c o n t e n t i o n or by output s h or t i n g i s pre v e n te d w i t h a t h e r m a l sh u t dow n c i rc u i t. the p a r t s a r e f u l l y s p e c if ie d o v e r t h e co mm er c i al a nd i n d u s t r i a l t e m p era t ur e ra ng es a nd al l a r e a v a i lab l e in 8 - le ad so i c and t h e ad m3483 an d th e ad m3485 ar e als o a v a i lab l e in an 8-lead lfcs p p a c k a g e s . func ti on a l bl ock di a g r a ms b a adm 3 4 8 3 / adm 3 4 8 5 r d ro re di v cc gn d de r d ro di v cc a b gnd z y adm 3 4 8 8 / adm 3 4 90 part no. guarantee d data rat e (mpbs) supply voltage (v) half/ful l duplex slew-rate limited driver/ reciever enable shutdown current (na) pin count a d m 3 4 8 3 0 . 2 5 h a l f yes yes 2 8 a d m 3 4 8 5 1 0 h a l f no yes 2 8 a d m 3 4 8 8 0 . 2 5 f u l l yes no - 8 a d m 3 4 9 0 1 0 3.0 to 3.6 full no no - 8 table 1. selecti o n table
adm3483/adm3485/adm3488/adm3490 preliminary technical data rev.prd | page 2 of 14 adm3483/adm3485/adm3488/adm3490 sp ecifications (v cc =3.3v 0.3%, t a = t min to t max , unless otherwise noted.) parameter min typ max units test conditions/comments driver differential output voltage, v od 2.0 v r=100? (rs-422), figure 3 vcc = 3.3v 5% 1.5 v r=54? (rs-485), figure 3 1.5 v r=60? (rs-485), vcc = 3.3v, figure 4 ? |v od | for complementary output states 0.2 v r=54? or 100 ? , figure 3 common mode output voltage, v oc 3 v r=54? or 100 ? , figure 3 ? |v oc | for complementary output states 0.2 v r=54? or 100 ? , figure 3 driver input logic cmos input logic threshold low, v ih 0.8 v de,di, re cmos input logic threshold high, v il 2.0 v de,di, re cmos logic input current, i n1 2 a de,di, re 1.0 ma v in = 12v input current (a,b), i n2 -0.8 ma v in = -7v de = 0v vcc = 0v or 3.6v 20 a v in = 12v output leakage (y,z), i o -20 a v in = -7v de = 0v, re = 0v vcc = 0v or 3.6v 1 a v in = 12v output leakage (y,z) in shudown mode, i o -1 a v in = -7v de = 0v, re = 0v vcc = 0v or 3.6v receiver differential input threshold voltage, v th -0.2 0.2 v -7v adm3483/adm3485/adm3488/adm3490 preliminary technical data rev.prd | page 4 of 14 timing specifications (v cc =3.3v, t a = 25) parameter min typ max units test conditions/comments receiver time to shutdown, t shdn 80 190 300 ns adm3483/adm3485 only, note 3 25 65 90 ns v id = 0v to 3.0v, c l = 15pf, figure 10 propagation delay, low-to-high level, t rplh 25 75 120 ns adm3483/adm3488 only. 25 65 90 ns v id = 0v to 3.0v, c l = 15pf, figure 10 propagation delay, high-to-low level, t rphl 25 75 120 ns adm3483/adm3488 only. 10 ns v id = 0v to 3.0v, c l = 15pf, figure 10 |t plh C t phl | propagation delay skew, t rpds 20 ns adm3483/adm3488 only. output enable time to low level, t przl 25 50 ns c l = 15pf, figure 11, adm3483/adm3485 only output enable time to high level, t przh 25 50 ns c l = 15pf, figure 11, adm3483/adm3485 only ouput disable time from high level, t prhz 25 45 ns c l = 15pf, figure 116, adm3483/adm3485 only ouput disable time from low level, t prlz 25 45 ns c l = 15pf, figure 11, adm3483/adm3485 only output enable time from shutdown to low level, t prsl 720 1400 ns c l = 15pf, figure 11, adm3483/adm3485 only output enable time from shutdown to high level, t prsh 720 1400 ns c l = 15pf, figure 11, adm3483/adm3485 only note1: ? v od and ? v oc are the changes in v od and v oc , respectively, when di input changes state. note 2: measured on |t plh (y) - t phl (y) | and |t plh (z) - t phl (z) |. note 3: the transceivers are put into shutdown by bringing re high and de low. if the inputs are in this state for less than 80 ns, the parts are guaranteed not to enter shutdown. if the inputs are in this stat e for at least 300ns, the part are gua ranteed to have entered shutdown. preliminary technical data adm3483/adm3485/adm3488/adm3490 rev.prd | page 5 of 14 ab1solute maximum ratings table 2. (t a = 25c unless otherwise noted) parameter rating v cc to gnd tbd digital i/o voltage (de, re , di, rout) tbd driver output/receiver input voltage tbd operating temperature range -40c to +85c storage temperature range -65c to +125c ja thermal impedance soic 110c/w lfcsp 62c/w lead temperature soldering (10 sec) 300c vapour phase (60 sec) 215c infrared (15 sec) 220c stresses above those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. adm3483/adm3485/adm3488/adm3490 prelim inary technical data rev.prd | page 6 of 14 pin conf igura t ions a nd f u ncti on descriptions 1 a d m 3 48 3 a d m 3 48 5 ro re de di v cc b a gn d 2 3 4 8 7 6 5 to p v i e w ( n o t t o s c al e) 1 ad m 3 4 8 8 ad m 3 4 9 0 v cc ro di gn d a b z y 2 3 4 8 7 6 5 to p v i e w ( n ot t o sc al e) table 3. adm3 483/adm34 85 pin descriptions pin no. mnemonic 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 low leve l ena b les the rece ive r 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. table 4. adm3 4884/adm3 49 0 pin descriptions pin no. mnemonic description 1 v cc 5 v power supply. 2 ro receiver output. when enabled, if a > b by 200 mv, then ro = high. if a < b by 200 mv, then ro = low. 3 di 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. 4 gnd ground. 5 y driver noninver ting output. 6 z driver inverting output. 7 b receiver inverti ng input. 8 a receiver noninv erting input. esd caution esd (electrostatic discharge) sensitive device. ele c trosta tic charg e s as high as 4000 v readily accumulate on the human body and test eq uipment and can discharge with out 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. prelim inary technical data adm3483/adm3485/adm3488/adm3490 rev.prd | page 7 of 14 test circuits and switching characteristics fi g u r e 3 . d r i v e r v od and v oc fi g u r e 4 . d r i v e r v od w i t h va r y i n g c o m m o n - m o d e vo l t a g e figure 5. r ece iv er v oh and v ol ! " # $ % & % $ '% % & % '% & & figure 6. dr iv er diff erent i a l output d e l a y and tr ansit i on t i m e s ! " # $ ( & ) & $ $ & ) ) ) fig u re 7. dr iv er pr o p ag at i o n de lay s adm3483/adm3485/adm3488/adm3490 prelim inary technical data rev.prd | page 8 of 14 ! " # ) & & $ $ ( & & ) f i gu r e 8 . dri v e r en a b le an d di sa b l e t i m e s ( t pz h , t psh , t phz ) ! " # $ ( )( & & $ & ) f i gu r e 9 . dri v e r en a b le an d di sa b l e t i m e s ( t pz l , t psl , t pl z ) ! " # $ & ) & $ & & ) f i g u re 10. r e c e iver p r op ag at ion d e l a y prelim inary technical data adm3483/adm3485/adm3488/adm3490 rev.prd | page 9 of 14 & & ! " # & $ ( ( * & ( ( ( ) ( & ) )( & $ & ( ) ( ( ( & ) )( $ & ( ( ( ) ( & ) & & & $ ( ) ( ( ( & ) ( f i g u re 11. r e c e iver e n able and d i s a bl e ti mes adm3483/adm3485/adm3488/adm3490 prelim inary technical data rev.prd | page 10 of 14 typical perf orm ance cha r acte ristics f i gure 1. o u tput current v s . r e c e ive r o u tput l o w v o lt ag e f i gure 2. o u tput current v s . r e c e ive r o u tput high v o lt a g e f i gure 3. r eceive r o u tput high v o lt a g e v s . t e mper ature f i gure 4. r eceive r o u tput l o w v o lt ag e v s . t e mper ature f i g u re 5. d r iver o u t p ut current v s . d i f f e r e nt ia l o u t p ut v o l t ag e f i gure 6. d r iver d i ff er e n tia l o u tput v o l t age v s . t e mpe r atu r e prelim inary technical data adm3483/adm3485/adm3488/adm3490 rev.prd | page 11 of 14 f i gure 7. o u tput current v s . d r ive r o u tput l o w v o lt age f i gure 8. o u tput current v s . d r ive r o u tput high v o lt age f i gure 9.sup p l y cur r ent v s . t e mper ature f i gure 10. sh u t do w n cur r ent v s . t e mper atu r e f i g u re 11. tbd f i g u re 12. tbd adm3483/adm3485/adm3488/adm3490 preliminary technical data rev.prd | page 12 of 14 circuit description the adm3483/adm3485/adm 3488/adm3490 are low- power transceivers for rs-485 and rs-422 communications. the adm3483 and adm3488 can transmit and receive at data rates up to 250kbps, and the adm3485/ adm3490 at up to 10mbps. the adm3488/ adm3490 are full-duplex transceivers, while the adm3483/adm3485 are half-duplex. driver enable (de) and receiver enable (re) pins are included on the adm3483/adm3485. when disabled, the driver and receiver outputs are high impedance. devices with receiver/driver enables (adm3483/adm2485) inputs outputs re de di b* a* mode x 1 1 0 1 normal x 1 0 1 0 normal 0 0 x high-z high-z normal 1 0 x high-z high-z shutdown table x. transmitting tr uth table inputs outputs re de a,b ro mode 0 0* +0.2v 1 normal 0 0* -0.2v 0 normal 0 0* inputs open 1 normal 1 0 x high-z shutdown table x . re ce iv i ng tr ut h table devices without receiver/driver enables (adm3488/adm2490) input outputs di z y 1 0 1 0 1 0 table x. transmitting tr uth table input outputs a,b ro +0.2 0 -0.2 1 inputs open 1 table x . re ce iv i ng tr ut h table reduced emi and reflections (adm3483/ adm3488) the adm3483/adm3488 are slew-rate limited, minimizing emi and reducing reflections caused by improperly terminated cables. low-power shutdown mode (adm3483/adm3485) a low-power shutdown mode is initiated by bringing both re high and de low. the devices will not shut down unless both the driver and receiver are disabled (high impedance). in shutdown, the devices typically draw only 2na of supply current. for these devices, the t psh and t psl enable times assume the part was in the low-power shutdown mode; the t pzh and t pzl enable times assume the receiver or driver was disabled, but the part was not shut down. driver output protection excessive output current and power dissipation caused by faults or by bus contention are prevented by two methods. a foldback current limit on the output stage provides immediate protection against short circuits over the whole common-mode voltage range (see typical performance characteristics). in addition, a thermal shutdown circuit forces the driver outputs into a high- impedance state if the die temperature rises excessively. propagation delay skew time is simply the difference between the low-to-high and high-to-low propagation delay. small driver/receiver skew times help maintain a symmetrical mark-space ratio (50% duty cycle). the receiver skew time, |tprlh - tprhl|, is under 10ns (20ns for the adm3483/adm3488). the driver skew times are 8ns for the adm485/adm3490, and typically under 100ns for the adm3483/adm3488. line length vs. data rate the rs-485/rs-422 standard covers line lengths up to 4000 feet. for line lengths greater than 4000 feet, see figure 13. typical applications the adm3483, adm3485, adm3488 and adm3490 transceivers are designed for bidirectional data communications on multipoint bus transmission lines. figures 11 and 12 show typical network applications circuits. these parts can also be used as line repeaters, with cable lengths longer than 4000 feet, as shown in figure 13. to minimize reflections, the line should be terminated at both ends in its characteristic impedance, and stub lengths off the main line should be kept as short as possible. the slew-rate-limited adm3483/adm3488 are more tolerant of imperfect termination. prelim inary technical data adm3483/adm3485/adm3488/adm3490 rev.prd | page 13 of 14 b a r d ro re di de a d m 3483 / a d m 34 85 b a r d ro re di de m a x i m u m n um be r o f t ra ns c e i v er s o n b us : 3 2 a d m 3483 / a d m 348 5 f i g u re 11. a d m 3 48 3/a d m 3 4 8 5 t y pic a l r s -4 85 net w o r k a d m 3488/ a d m 3490 b a r d ro di y z re de b a y z ro di re de r d b ay z r d ro di re de b ay z r d ro di re de ma x i mu m n u m b e r o f n od e s : 3 2 ma s t er sl a v e sl a v e s l a v e a d m 3 4 88/ a d m 3 490 f i g u re 12. a d m 3 48 8/a d m 3 4 9 0 f u ll d u plex r s -4 8 5 n e t w ork adm 3 4 8 8 / adm 3 4 9 0 b a r d ro di y z re de da t a i n da t a o u t f i gur e 1 3 . li ne re pe a t e r f o r adm 3 488/ adm34 9 0 adm3483/adm3485/adm3488/adm3490 prelim inary technical data rev.prd pae 14 f 14 outline dimensions 0.25 0.0098 0.1 7 (0.00 6 7 ) 1.27 (0.0500) 0.4 0 (0.01 5 7 ) 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) 85 4 1 5.00 (0.1968) 4.80 (0.1890) 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) 0.3 1 (0.01 2 2 ) coplanarity 0.10 f i g u re 6. 8-l e ad st anda r d s m al l o u t l i n e p a ck ag e [soic ] (r -8) di me nsio ns sho w n i n mi ll im e t e r s f i g u re 7. 8-l e ad l e ad f r a m e c h ip s c al e p a ckag e [l fcsp ] (c p - 8) di me nsio ns sho w n i n mi ll im e t e r s ordering guide m d e l t e m p e r a t u r e r a ne pacae type brandin adm3483ar 40c t 85c r-8 adm3483acp 40c t 85c cp-8 ADM3485AR 40c t 85c r-8 adm3485acp 40c t 85c cp-8 adm3488ar 40c t 85c r-8 adm3490ar 40c t 85c r-8 2004 anal de vices, inc. all rihts reserve d . tra d em ars and reistered tra d emar s are the prper ty f th eir respectiv e c mpan ies . prin ted in th e u.s . a. |
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