19-2370, Pov & 107 MM AAI/V Complete, +5V-Powered, Isolated, Dual RS-232 Transceiver Module General Description The MAX?52 complete, electrically isolated, cua. RS-732 transriillerfreceiver system requires no exlermnal carr po- nents. By comb nirg mary functiors in cne package, the cost aid comploxity of ar solated digital interface are greatly reauced A sirgle +5 supp y powers both sides of the interface Transceivers. optacouplers, and a transorrer in one low cost oackage provide a corrplete imerface up to 9600 hitssec Additiona' pins provioe cw-pawer shutdown and ahytiumpecanne state for bota transmitter ouputs lhe MAX252A4 withstanas 130Vaws (continuous), 1260Varwe (1 min.) or 1520VRus (1 sec ) and ts intended for applications where very high transient voltages, cit- ferontial ground potentials or noise may be ercountered The MAX252A 1s UL recognized The MAX2526 is in- tendea for less stringent applications and is raced fer 500pms (1 mia) or GO0Vraue (1 sec.) Receivers and line drivers (transm tles) nee: FIA AS-232D ana CCITT V.28 specificatians Tre MAX252 is sudplied in 40-pin pastic DIP packages in corr srcial (OC to + 70C) and extended [-40 C to +85 C) temnera- ture ranges Applications High-Noise Environmerts Automalic Test Cqu prnent Differential Ground Potentials Typical Application ; nS vit . SDLAT.ON 7 3A78 LR HANDSHAKE | ub Liste JART IsulateloPen is 232 mertact JA AXLM Features Isolated Data Interface # No External Components @ Single +5V Supply @ 50uUW Low-Power Shutdown # Two Transmitters and Two Receivers # UL Recognized (MAX252A) - File E118032 to UL1577 Ordering information | PART PIN-PACKAGE TEMP. RANGE MAX252,ACH, UG iw 4706 40 Pastc Module MAX 252BCHI OC te 4700 19 Plastie Module OC te +820 490 ta MAX252A7HI MAM 2SEBEHL AQ Plashe Madula at) Plast Maule | TOP v FW ATL AL van isa] Luin [34 wR ANE mM [| mvs Yea. | ' he da Nt in| "| ie ene fT Bp, Elly Le] sry en: Ay GNU ETP Fu oy eee Sk Fea) 4 pay pal beta [13] ps] 12 a4 Ine [l4 eT Try Lente Pen Lon to [1-4 1) ANT Ut Topple ead PAD 13) Lt FL dh Ren J SP Ee Role jeu ba Rey Maxim integrated Products 1 Cail toll free 1-800-998-8800 for free samples or literature. cScXVWNMAX252 Complete, +5V-Powered, Isolated, Dual RS-232 Transceiver Module ABSOLUTE MAXIMUM RATINGS Vo tages wilh respect to GND (pin 10) LED arvard Cecteuous Curren: doing 15, 177,21, 23h Som4 Supe y Volage, Vor ee . -03V ta +6V Power Diss Pallant Input Vo tage Plasue DIP (erate 1OmW) C above +O C) 650r Wi Ping 3. /, 811,13, 14, 18,20 0.0... O.2 to (Vor +O.9V) Qperatiig Temiperalure Ranges Voltages with respect lo 180 GND (pin 38) MAXCQEACHLISCHL eee Otte -7OC RAS-232 Input Voltage (ning 33, 34) . . 2. (SOV to -3OV MAXPEPAPHLIBEHL ...-- -40 Cte +89 C RS-232 Acpliee Qupit Votage (eins 35. 36). -16 ta - 15V Steraqe Lamocrature Range bee 65 Cte 1160 C Ping 32 37 ) , a +15 Lead Ter scrature (soldering, 1500 } 2800 C Pagad 2B at : te RS 232 Trane cr outputs r may pe shorted individually and indef~ Lely to ISO CMD itadiuadoy asoie Masuriuen Maangs May cause pormaqunn 14 fhe device al iss Boomer candies Boypunt if mwhoated in We ic ahadiie Mann falitlg concibans for estum ied prrsds may allect dew a heatuiny sit S Hinge aed, tte tapi ioeat starry nce Ponte ho nome device (her ook ae secuds ELECTRICAL CHARACTERISTICS Ver - 1 $ 410%. Ta = vinta Tax, Un 23s Gherwisa noted | _ ee _ __ [ PARAMETER _ SYMBOL! CONDITIONS MIN TYP MAX | UNITS. | ISOLATION (Note 1) _ 180. 1500 A= 2250 smn iMate D4 ~~ age | MAKD524 min (Mate 2) | oe | lest Voltage VSO | Cotte ous (Note 2) 130 VRMIG q L HI? J0Us Thole &) , 7 1 sec. 600 WAK2523 _ __- | Timir. (Note 2) _ 200 _ . ay Sn anaS. BEL Leakage Curert | os 2 = S00VEMS, BCH, aos 5 u + fs co | | 3 wa om rE Te ce oF ag Isolation Resistar 23 500VbU 19 ! | Canaciarca : -_- - _ ny th gr __ tj POWER SUPPLY | ie _ _ : : Q Supuly | Tas +26 C | Tan Tig Bl. Hein = Yor oo OO Qperaing Supoly Curren: GL o re = - ma p aeupeyy BADN OV tin 12in RI. Pin 0 5 15 | Shutdown Sunply Curent /| SHDN = Yoo Ta = +28 C - : 0 pA | chs - Oren ILM. - = Yor 1 . = nm 1" -l 1 or Weer 7 CA, SHOWN Iron Current ISHDT: Inpet OND to en | gaol 1 | HA | | TTLCM CMOS iOS INPUTS/OUTPUTS _ l T-UICMOS Input Pul-Us Current | ip Vin = OV ; | 4 20 WA TCNOS Quiput VeltagLow , Ver | lour=3 mA - ad v | ITLICMOS Outpul Vellage Higa | Vor leu =-1 Oma 35 | Apart lagu. [rreshold tigh Vr Tin. Tein EN, SHON a 1a ee v Ingut Logie Theescola Low vi 4p, T2in FN. SHOM __ | ne 13 | Input Hysteres $ Try T2in no v Leakage Current, me . IN ae nyo Yer | , | Output Disab e l11, T2, ENarSFDN = Voc ; 10 | uA | a 4 Inpur Capacitance __ Cin lan, Tir. Note 1: irs 1-20 tied ogeth can gins 21-40 ved together Note 2; Vale derived rom 1 see tosh 2 . _ #MAXIMELECTRICAL CHARACTERISTICS (continued) (Ver = +5V 70%, Ta = Twin to TMax, enless otherwise male.) Complete, +5V-Powered, Isolated, Dual RS-232 Transceiver Module MAXIM ISNLACION BAR AIER PARAMETER | SYMBOL | CONDITIONS MIN TYP MAX UNITS RS-232 CHARACTERISTICS ere as Bein : Tho lt. TROUT 5 7 ! o ace Sy Vi eis 7" Er 172 \ R5-202 Qutput Valtage Swirg PF RL ak to ISO 5 t v HS-232 Oulput Leasage Curreril Te Your a zy = Wee. -106 +100 uA RS 242 Inaut Thresherd High [Poin Reins a 148 a0 v RS 242 Inout Thresho d ow Rein, Rein 6 41? v RS-?32 Inpur Hysleests Poin, Rein aie V RS-23? Input Resistarcs Rain, Rei, Ta = +25 0 a 7 kaa ere rratter ~w Bato fo - 4k, 0) ~ PhO0pF Same & Tested 4 : ive Transmitter Quipet Slew Rate 3A Measured from +3v to -8V or -2 10 +3V a wis P r tH BS-232 to FIL ad ropaqation Nelay Us peg , tt TTL 9 AS33? 2g , Sample ested Transmiss on Yate R_ = oka 9000 192090 3 tefsec CL - 220cpF Typical Operating Circuit | afta : AG uy Bye ie GEG. S| IS PAR 3) SHON | * ' wey e =) o i PYF] 31 . 8) tbr [ s | - ant DP 36 le on : 35 2o2 OLT Tu 7] Tem enuiry 3h seset , per * [ sn * 1*] EN | ts I if ter (| tipuf 34 ea [| i 4 Wo . : R222 Ils 12] Fao: vk [ Rein | 23 . ) ee WL? L3 Tes Tv rif 2 | PTA pe T2yn] 28 [aF] Terre ue | Aa] 1a] Kisct AAA on TP His BES sien [22 TP Robe Ati [CL | ip Rasy Para | et! 10] GND SUGNa] 38 Why -0) COM | CHL GNM] 25, ed ee FECOM] <2, cScXViNComplete, +5V-Powered, Isolated, Dual RS-232 Transceiver Module Typical Operating Characteristics MAX252 TRANSMITTER MAX252 TRANSMITTER SLEW RATE SLEW RATE MAX252 ENABLE. DISABLE TIME vs. TEMPERATURE vs. LOAD CAPACITANCE vs. TEMPERATURE Me 18 T 14 : To TT yan |] ee Ta th on \ Le ce a Woo - bby 2600 BS-232 SES MIT MAX252 14 7 . ~ ar aaa 4 3 2 | 20 = Soy __ J & : a ao, we _ me r = z = IT. = 5 ; a = 190 | DAL = av, Yoo - 15 7 i sr | 1 1 ) u Sh -e8 of ah OB G25 f 2000 490 BOD UOT Tenn Pant TEMPERATUPE( G) LOAD CAPACITANCE (CF) TEMPO ATUPE Cy POWER-UP DELAY TO TIME FROM SHUTDOWN TO TRANSMITTER OUTPUTS POWER-UP say I Vio. aw - Ty PAL N ke 4 rt OY SHITUOM, |b! | FANSITE OSTSUTS + rely | | | | | | Li iy | Stee DIY Swoly | TRANDN ITER OUTS 4 are {4 Tu Loan - 2he2 Tn Ty MAAXLANComplete, +5V-Powered, Isolated, Dual RS-232 Transceiver Module PIN | NAME FUNCTION ; _ _ | Receiver #1 Output TT OMOs logic ' | Kiow love + | 2 Internal Corimectior | eave this pin . = eaconnecied. Oo rat graunc. Shutdown. Ween k gh urns efl tie | 3 SHIH oscillator ard disconnects ariver in- puls, Grounc far narra: operation. 4 Dp: Interval Conrection. cave thig gir un- |_curmected. Du ~ol ground | 5 Voc +5V Guaply vatage 6 Tarpon | Transm tter #2 LLD Driver | > 1D) Trarsmitter #2 Input; WCMOS ogic el levels _ ; smi n MOMS login: 4 Thins [ransmitier #1 Input TTLASMSS loge: _- evels Q 4ILoR Trensritles #1 63 Oriver | 10 SND Ground Sulput Enable li tiga, TILCR. 7 +1 EN ator. RIO LT. and R29C07 aa to * gh- impedance sate. Ground for noreral | oparanioan, an - #2 MO-> 3 le Ret)! Ficcawve He Output. TTLIC MGS logic 13 Renin Raceiver #2 Detesier Input 4 RApin Receiver #1 Detector Input | 1h TILED Mt LED Argued Input - ie cor mar att bo, 2bec Gathede 1e 16 LEDCOM] Grane V TAPS TELCOS Anode Input 18 Riper , Rt Photodiode Cachode Qulou. | ' 1 Common Riue7, R@pET Anode. Pc 9 DRL COM] Se eaund 20 REDE! R2 Phociosde Cateode Guieut | #VLAXLM Pin Description = 'BINa@ | NAME | FUNCTION | & ai | 42ep | RE LEN Cateee Input , > a9 ISO. LED | Common Ri |. KELED Cathode Tie Ny | = COM to Isolated Gracd | th 23 HiL_b R1 LED Calbede Input Ny [ e4 fan | 2 Protodiode Atiode Ourput or ISOOCT ) Common Tipet. T2pET FD Arode, a COM | Tig te Isqaled Greundl 26 T Apr T , i Phenecioce Anode Gulaut = 7 Tour ~ Transmitter #1 Detector Inout | pot TADIN | Tranerartar #? Delete Ir put | RILL aooeiver #1 LL Dr ver | aR =LnR Recover #2 LED Mr ver 1 Bye Irterr i Connector Leave this pr un- conrecied Do net ground | 3F 7 Ma 15 ale Pos tye Supply | | 3a a2y | HS-292Recewer 4? Inpul | a4 Rain 23? Receiver #1 Input - RS-P3P Trans Tiller #2 Cuiput 3i 4g RS-232 Trans ctor #1 Qataue 7 , oY ec ated Pos t ve SURE Isalaled Ground | ae 4 Ve seid isa on | [- ag ve Ircemnal Coviecth | bevel s pin ; AC 10 uncenmectec. De rat graurad Isolatec Negative Supoly VolaqeMAX252 Complete, +5V-Powered, Isolated, Dual RS-232 Transceiver Module Isolation Applications Ihe MAX252 is intended tor ndustrial communications and control appucations were vollage tarsients, d'tter- ential ground sotentials or high noise may be encoun lerca. The MAX?52A withstands 130Vnma (cortirLous), 1260Vams (1 min} or 1520VEvs (1 sec.}. For less s:rin- gent applications, the MAX256 ts cated a. 500Vaus (1 min.) or G00Vams (1 Sec.). For applications requing higher isolat'on ralings or lransmission rates greater than 9600 baud Maxim recommends the MAX250 ard MAX251 device sel that uses externa. optocouplers and transformer. Figure | shows the lyrical interconnection fora complete 9600 blis/sec lransce.ver. Imoortant layout cons dera- tons include: *Farmaximum isolation, the isolation line through che center ot Figure 1 should not be breached; connections from each side should be kept senarale * Optocaupler outputs (pins 18, 20. 24, and 26) are righ-impedance nodes, so connecting traces should be - Re aS a | 4 SHIN) J + LO GHD | ty, AKiaa MAKAS2 7 + | 2a jut gy ; Peal = [ Kon! | " fra | |) Mn I} Lepcana fo iid | Feo i Att, fia | __UST ESM), Rebe. i + + SULATION BARRIZP as short as possible to minimize stray capacitance and raximize data lranster rate, shunt Capacitance seer by each pin should not exceed 1OpF The MAX 252 pin out cnables opt mal printed crcui: board layout by minimizing interconnect lengts ana crogs- overs. Figure 2 shows the preferred layout, which is strongly recommended for 9600 b'ts/sec appications Note the position of the ground traces. particularly tre protection of pn 20 by tre wraparound from on 19 Isolation Example 4 Figure 3 ilustrates row lo solale an existing AS-232 interface by inserting a MAX?S2 and MAX?33 in series. Both devices invert wh le translating RS-P32 lo TTL and TTL to RS-232 'evels. Since where is co net inversion, the circun unctions like two pain pieces o wire, but with 1520Vums (al 1 soc.) isolat an oetween the pars. Detailed Description Ihe MAX252 cortans two integrated circuits. four op- tocouplers four capactors, two dodes, ard a small transformer, Togelner these provide a complete. isc- lated, dual RS-232 vansrminter and reeciver Trice rian-iso- lated or logc side of lre irlerlace transters logic signals io and from ihe optocouplers, wile tre isolated or cable side transers dala between the oprocoupless ard RS-232 LP Ey PI MIN al | tual <e = a CHON 0 G0 ag Bay ne a T2 1 a ot ae ft = GND a cH Fe Wil PIN." PIN #t! Piquee t, Typeatinterconnectens 6 gure 2 Preferrogd Layout . MAAXLAAComplete, +5V-Powered, Isolated, Dual RS-232 Transceiver Module 1 wy "Pvee a 7 5 f / . | i 5 nye * 2 PEE Teg Be aa A) : A alle | | oyf ct! : =| SHDN " ' . | 4 _| | | oa | | Or r ll ey el Tn al: | | eo a | N Il | = : ; | BAI - | HN ype Serpe | I, | fer | | | oD Fears . l | Aer] 33 | | | : ee dL ae at | 2 eee | Ea vb fe! 3b a | | ep ISG. ATION B&na1ER > igure 2 AS 282 Isolahor Adzoter from a State + Supol trans tiers (Ine drivers) and receivers. The MAX?52 also cortains ar isolation transformer and deve circu.try to supply power to the solaled sicic of the interface Also inviuded are an OUTPUT ENABLE contre: (EN) and a SHUTDOWN pin (SHDN) EN places all driver catpuis na high-impedance state ween driven high SHDN, On ihe iogic side of ihe MAX252 ere four identical non- inverting drivers whose outputs may be used ether as oplocoumer] ED drivers or as TIL/OMOS logic ovtputs, Fach ariver input (Tin. 124, Rise, Ron) cas a weak 4uA ntemal puilup current source, and O.5V hysteresis to Mmprove neise rejection, logic thresholds far the d-iver iInguts conform te slandard TIL/CMGS specifications, The RS-232 side of the inlertace incluaes two line drivers and receivers along with circuitry to translale these levele to optocoupler signals. The RS-232 inputs (Ris, Re) and outputs (Tiout, 12rd) conform lo EIA AS-232D ane CCITT V.28 spectications. The inpcts to [he RS-232 line drivers (Tiny, T2pi). which are normally stoped to the internal optoisolgtors. are TTIUICMOS corrpatible JAAXLAA - - wren pulled high, pertorris die folowing furictions 1) Ioens off the *30H2 oscillator, removing cower from the RS-232 side of the interface. 2)Places Tis, and Tourin a high-mnpecence state 3) Disables the 4uA pull-up currents at che lagic-s de driver inputs (74 5,, 12iry, Ronin. RE 4} Rasets logic-side driver outputs (T1_o7. Tar, Riour. R2oni) to low 5) Reduces power consumption to SOW Module Product Reliability For relability data on May irs Mode Product | re, sce Rellability Regort RR-3A .MAX252 Complete, +5V-Powered, Isolated, Dual RS-232 Transceiver Module MAX252 Biock Diagram le SHUN *30kHE coh |" : - wu [ - U7] asl la! AMAL [ : I i) P TILER 7 laa TH. Toth. a] Men . [> Hew iy i | ee Moa 9 S00 208 be fa dua . nd SpA | a oY [> 2 Hy ln | Tet he [es rin] > loaf + Ww -* 4UA 2s ok be a ET alr a <] ii pf Ut Pind prt <] t "Fay -i-~ ~! UET COM za woe SOLD USM bhi e Se + 7 oh, AWA pa , aa a Feu <] pion. pap Peet : Fairy jaf RE <] a bs zs rere _ uF MZ oh ; FA | ote Lh | . ISCLATICN RARRIFH Mayim cannot assume responsibility for use of any citculry ciher than ecreuiry entirely embodied in a Maan product No ercuil patent tcenses are iApled Maxim roserves ihe ngnl fo change the creuiry and speciicatians without rlotice af any time, 8 Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (403) 737-7600 1994 Maxim Integrated Products Printed USA AMAXKLM 15 a regisleed trademark of Maxim Inteqratea Producis.