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general description the max3070e?ax3079e 3.3v, ?5kv esd-protected, rs-485/rs-422 transceivers feature one driver and one receiver. these devices include fail-safe circuitry, guar- anteeing a logic-high receiver output when receiver inputs are open or shorted. the receiver outputs a logic high if all transmitters on a terminated bus are disabled (high impedance). the max3070e?ax3079e include a hot-swap capability to eliminate false transitions on the bus during power-up or hot insertion. the max3070e/max3071e/max3072e feature reduced slew-rate drivers that minimize emi and reduce reflec- tions caused by improperly terminated cables, allowing error-free data transmission up to 250kbps. the max3073e/max3074e/max3075e also feature slew- rate-limited drivers but allow transmit speeds up to 500kbps. the max3076e/max3077e/max3078e driver slew rates are not limited, making transmit speeds up to 16mbps possible. the max3079e slew rate is pin selectable for 250kbps, 500kbps, and 16mbps. the max3072e/max3075e/max3078e are intended for half-duplex communications, and the max3070e/ max3071e/max3073e/max3074e/max3076e/max307 7e are intended for full-duplex communications. the max3079e is selectable for half-duplex or full-duplex operation. it also features independently programmable receiver and transmitter output phase through separate pins. the max3070e?ax3079e transceivers draw 800? of supply current when unloaded or when fully loaded with the drivers disabled. all devices have a 1/8-unit load receiver input impedance, allowing up to 256 transceivers on the bus. applications lighting systems industrial control telecom security systems instrumentation features ? 3.3v operation ? electrostatic discharge (esd) protection for rs-485 i/o pins 15kv human body model ? true fail-safe receiver while maintaining eia/tia-485 compatibility ? hot-swap input structure on de and re ? enhanced slew-rate limiting facilitates error- free data transmission (max3070eCmax3075e/max3079e) ? low-current shutdown mode (except max3071e/max3074e/max3077e) ? pin-selectable full-/half-duplex operation (max3079e) ? phase controls to correct for twisted-pair reversal (max3079e) ? allow up to 256 transceivers on the bus ? available in industry-standard 8-pin so package +3.3v, ?5kv esd-protected, fail-safe, hot-swap, rs-485/rs-422 transceivers ordering information 19-2668; rev 2; 4/09 part? temp range pin-package max3070e epd -40c to +85c 14 plastic dip max3070eesd -40c to +85c 14 so max3070eapd -40c to +125c 14 plastic dip max3070easd -40c to +125c 14 so max3071e epa -40c to +85c 8 plastic dip MAX3071EESA -40c to +85c 8 so max3071eapa -40c to +125c 8 plastic dip max3071easa -40c to +125c 8 so selector guide, pin configurations, and typical operating circuits appear at end of data sheet. ordering information continued at end of data sheet. ?devices are available in both leaded (pb) and lead(pb)-free packaging. specify lead-free by adding a ??after the part number. ordering information functional diagrams pin configurations appear at end of data sheet. functional diagrams continued at end of data sheet. ucsp is a trademark of maxim integrated products, inc. available for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim?s website at www.maxim integrated.com. max3070eCmax3079e
+3.3v, ?5kv esd-protected, fail-safe, hot-swap, rs-485/rs-422 transceivers absolute maximum ratings dc electrical characteristics (v cc = 3.3v ?0%, t a =t min to t max , unless otherwise noted. typical values are at v cc = 3.3v and t a = +25?.) (note 1) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. (all voltages referenced to gnd) supply voltage (v cc ).............................................................+6v control input voltage ( re, de, slr, h/f , txp, rxp)......................................................-0.3v to +6v driver input voltage (di)...........................................-0.3v to +6v driver output voltage (z, y, a, b) .............................-8v to +13v receiver input voltage (a, b)....................................-8v to +13v receiver input voltage full duplex (a, b) ..................................................-8v to +13v receiver output voltage (ro)....................-0.3v to (v cc + 0.3v) driver output current .....................................................?50ma continuous power dissipation (t a = +70?) 8-pin so (derate 5.88mw/? above +70?) .................471mw 8-pin plastic dip (derate 9.09mw/? above +70?) .....727mw 14-pin so (derate 8.33mw/? above +70?) ...............667mw 14-pin plastic dip (derate 10.0mw/? above +70?) ...800mw operating temperature ranges max307_ee_ _ ................................................-40? to +85? max307_ea_ _ ..............................................-40? to +125? max3077emsa .............................................-55? to +125? junction temperature ......................................................+150? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? parameter symbol conditions min typ max units driver r l = 100 (rs422), figure 1 2 v cc r l = 54 (rs485), figure 1 1.5 v cc differential driver output v od no load v cc v change in magnitude of differential output voltage v od r l = 100 or 54 , figure 1 (note 2) 0.2 v driver common-mode output voltage v oc r l = 100 or 54 , figure 1 v cc / 2 3 v change in magnitude of common-mode voltage v oc r l = 100 or 54 , figure 1 (note 2) 0.2 v input high voltage v ih de, di, re , txp, rxp, h/ f 2 v input low voltage v il de, di, re , txp, rxp, h/ f 0.8 v input hysteresis v hys de, di, re , txp, rxp, h/ f 100 mv input current i in1 de, di, re 1 a input impedance first transition de 1 10 k input current i in2 txp, rxp, h/ f internal pulldown 10 40 a srl input high voltage v cc - 0.4 v srl input middle voltage v cc x 0.4 v cc x 0.6 v srl input low voltage 0.4 v srl = v cc 75 srl input current srl = gnd -75 a v in = +12v 125 output leakage (y and z) full duplex i o de = gnd, v cc = gnd or 3.6v v in = -7v -100 a max3070e?max3079e 2 maxim integrated
+3.3v, ?5kv esd-protected, fail-safe, hot-swap, rs-485/rs-422 transceivers dc electrical characteristics (continued) (v cc = 3.3v ?0%, t a =t min to t max , unless otherwise noted. typical values are at v cc = 3.3v and t a = +25?.) (note 1) parameter symbol conditions min typ max units 0 v out 12v (note 3) 40 250 driver short-circuit output current i osd -7v v out v cc (note 3) -250 -40 ma (v cc - 1v) v out 12v (note 3) 20 driver short-circuit foldback output current i osdf -7v v out 1v (note 3) -20 ma thermal-shutdown threshold t ts 175 c thermal-shutdown hysteresis t tsh 15 c v in = +12v 125 input current (a and b) i a, b de = gnd, v cc = gnd or 3.6v v in = -7v -100 a receiver receiver differential threshold voltage v th -7v v cm 12v -200 -125 -50 mv receiver input hysteresis v th v a + v b = 0v 15 mv ro output high voltage v oh i o = -1ma v cc - 0.6 v ro output low voltage v ol i o = 1ma 0.4 v three-state output current at receiver i ozr 0 v o v cc 1 a receiver input resistance r in -7v v cm 12v 96 k receiver output short-circuit current i osr 0v v ro v cc 80 ma supply current no load, re = 0, de = v cc 0.8 1.5 no load, re = v cc , de = v cc 0.8 1.5 supply current i cc no load, re = 0, de = 0 0.8 1.5 ma supply current in shutdown mode i shdn re = v cc , de = gnd 0.05 10 a esd protection esd protection for y, z, a, and b human body model 15 kv note 1: all currents into the device are positive. all currents out of the device are negative. all voltages are referred to device ground, unless otherwise noted. note 2: v od and v oc are the changes in v od and v oc , respectively, when the di input changes state. note 3: the short-circuit output current applies to peak current just prior to foldback current limiting. the short-circuit foldback ou t- put current applies during current limiting to allow a recovery from bus contention. max3070eCmax3079e maxim integrated 3
+3.3v, ?5kv esd-protected, fail-safe, hot-swap, rs-485/rs-422 transceivers driver switching characteristics max3070e/max3071e/max3072e/max3079e with srl = unconnected (250kbps) (v cc = 3.3v ?0%, t a = t min to t max , unless otherwise noted. typical values are at v cc = 3.3v and t a = +25?.) parameter symbol conditions min typ max units t dplh 250 1500 driver propagation delay t dphl c l = 50pf, r l = 54 , figures 2 and 3 250 1500 ns driver differential output rise or fall time t dr , t df c l = 50pf, r l = 54 , figures 2 and 3 350 1600 ns differential driver output skew |t dplh - t dphl | t dskew c l = 50pf, r l = 54 , figures 2 and 3 200 ns maximum data rate 250 kbps driver enable to output high t dzh figure 4 2500 ns driver enable to output low t dzl figure 5 2500 ns driver disable time from low t dlz figure 5 100 ns driver disable time from high t dhz figure 4 100 ns driver enable from shutdown to output high t dzh ( shdn ) figure 4 5500 ns driver enable from shutdown to output low t dzl ( shdn ) figure 5 5500 ns time to shutdown t shdn 50 200 600 ns receiver switching characteristics max3070e/max3071e/max3072e/max3079e with srl = unconnected (250kbps) (v cc = 3.3v ?0%, t a = t min to t max , unless otherwise noted. typical values are at v cc = 3.3v and t a = +25?.) parameter symbol conditions min typ max units t rplh 200 receiver propagation delay t rphl c l = 15pf, figures 6 and 7 200 ns receiver output skew |t rplh - t rphl | t rskew c l = 15pf, figures 6 and 7 30 ns maximum data rate 250 kbps receiver enable to output low t rzl figure 8 50 ns receiver enable to output high t rzh figure 8 50 ns receiver disable time from low t rlz figure 8 50 ns receiver disable time from high t rhz figure 8 50 ns receiver enable from shutdown to output high t rzh ( shdn ) figure 8 4000 ns receiver enable from shutdown to output low t rzl ( shdn ) figure 8 4000 ns time to shutdown t shdn 50 200 600 ns max3070e?max3079e 4 maxim integrated
+3.3v, ?5kv esd-protected, fail-safe, hot-swap, rs-485/rs-422 transceivers driver switching characteristics max3073e/max3074e/max3075e/max3079e with srl = v cc (500kbps) (v cc = 3.3v ?0%, t a = t min to t max , unless otherwise noted. typical values are at v cc = 3.3v and t a = +25?.) parameter symbol conditions min typ max units t dplh 180 800 driver propagation delay t dphl c l = 50pf, r l = 54 , figures 2 and 3 180 800 ns driver differential output rise or fall time t dr , t df c l = 50pf, r l = 54 , figures 2 and 3 200 800 ns differential driver output skew |t dplh - t dphl | t dskew c l = 50pf, r l = 54 , figures 2 and 3 100 ns maximum data rate 500 kbps driver enable to output high t dzh figure 4 2500 ns driver enable to output low t dzl figure 5 2500 ns driver disable time from low t dlz figure 5 100 ns driver disable time from high t dhz figure 4 100 ns driver enable from shutdown to output high t dzh ( shdn ) figure 4 4500 ns driver enable from shutdown to output low t dzl ( shdn ) figure 5 4500 ns time to shutdown t shdn 50 200 600 ns receiver switching characteristics max3073e/max3074e/max3075e/max3079e with srl = v cc (500kbps) (v cc = 3.3v ?0%, t a = t min to t max , unless otherwise noted. typical values are at v cc = 3.3v and t a = +25?.) parameter symbol conditions min typ max units t rplh 200 receiver propagation delay t rphl c l = 15pf, figures 6 and 7 200 ns receiver output skew |t rplh - t rphl | t rskew c l = 15pf, figures 6 and 7 30 ns maximum data rate 500 kbps receiver enable to output low t rzl figure 8 50 ns receiver enable to output high t rzh figure 8 50 ns receiver disable time from low t rlz figure 8 50 ns receiver disable time from high t rhz figure 8 50 ns receiver enable from shutdown to output high t rzh ( shdn ) figure 8 4000 ns receiver enable from shutdown to output low t rzl ( shdn ) figure 8 4000 ns time to shutdown t shdn 50 200 600 ns max3070eCmax3079e maxim integrated 5
+3.3v, ?5kv esd-protected, fail-safe, hot-swap, rs-485/rs-422 transceivers driver switching characteristics max3076e/max3077e/max3078e/max3079e with srl = gnd (16mbps) (v cc = 3.3v ?0%, t a = t min to t max , unless otherwise noted. typical values are at v cc = 3.3v and t a = +25?.) parameter symbol conditions min typ max units t dplh 50 driver propagation delay t dphl c l = 50pf, r l = 54 , figures 2 and 3 50 ns driver differential output rise or fall time t dr , t df c l = 50pf, r l = 54 , figures 2 and 3 15 ns differential driver output skew |t dplh - t dphl | t dskew c l = 50pf, r l = 54 , figures 2 and 3 8 ns maximum data rate 16 mbps driver enable to output high t dzh figure 4 150 ns driver enable to output low t dzl figure 5 150 ns driver disable time from low t dlz figure 5 100 ns driver disable time from high t dhz figure 4 100 ns driver enable from shutdown to output high t dzh ( shdn ) figure 4 1250 1800 ns driver enable from shutdown to output low t dzl ( shdn ) figure 5 1250 1800 ns time to shutdown t shdn 50 200 600 ns receiver switching characteristics max3076e/max3077e/max3078e/max3079e with srl = gnd (16mbps) (v cc = 3.3v ?0%, t a = t min to t max , unless otherwise noted. typical values are at v cc = 3.3v and t a = +25?.) parameter symbol conditions min typ max units t rplh 40 75 receiver propagation delay t rphl c l = 15pf, figures 6 and 7 40 75 ns receiver output skew |t rplh - t rphl | t rskew c l = 15pf, figures 6 and 7 8 ns maximum data rate 16 mbps receiver enable to output low t rzl figure 8 50 ns receiver enable to output high t rzh figure 8 50 ns receiver disable time from low t rlz figure 8 50 ns receiver disable time from high t rhz figure 8 50 ns receiver enable from shutdown to output high t rzh ( shdn ) figure 8 1800 ns receiver enable from shutdown to output low t rzl ( shdn ) figure 8 1800 ns time to shutdown t shdn 50 200 600 ns max3070e?max3079e 6 maxim integrated
+3.3v, ?5kv esd-protected, fail-safe, hot-swap, rs-485/rs-422 transceivers supply current vs. temperature max3070e toc01 temperature (c) supply current (ma) 100 75 50 25 0 -25 0.6 0.7 0.8 0.9 1.0 0.5 -50 125 de = v cc de = 0 output current vs. receiver output high voltage max3070e toc02 output high voltage (v) output current (ma) 3.0 2.5 2.0 1.5 1.0 0.5 5 10 15 20 25 30 0 0 3.5 output current vs. receiver output low voltage max3070e toc03 output high voltage (v) output current (ma) 3.0 2.5 2.0 1.5 1.0 0.5 5 10 15 20 25 30 35 0 0 3.5 receiver output high voltage vs. temperature max3070e toc04 temperature (c) output high voltage (v) 100 75 50 25 0 -25 3.05 3.10 3.15 3.20 3.25 3.30 3.00 -50 125 i o = -1ma receiver output low voltage vs. temperature max3070e toc05 temperature (c) output low voltage (v) 100 75 -25 0 25 50 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0 -50 125 i o = -1ma driver output current vs. differential output voltage max3070e toc06 differential output voltage (v) output current (ma) 3.0 2.5 1.5 2.0 1.0 0.5 10 20 30 40 50 60 70 80 90 100 0 0 3.5 driver differential output voltage vs. temperature xmax3070e toc07 temperature (c) differential output voltage (v) 100 75 25 50 0 -25 1.70 1.80 1.90 2.00 2.10 2.20 2.30 2.40 2.50 2.60 1.60 -50 125 r l = 54 output current vs. transmitter output high voltage max3070e toc08 output high voltage (v) output current (ma) 3 2 -6 -5 -4 -2 -1 0 -3 1 20 40 60 80 100 120 140 160 0 -7 4 output current vs. transmitter output low voltage max3070e toc09 output low voltage (v) output current (ma) 10 8 6 4 2 20 40 60 80 100 120 140 160 180 0 012 typical operating characteristics (v cc = 3.3v, t a = +25?, unless otherwise noted. note: the max3077emsa/pr meets specification over temperature.) max3070eCmax3079e maxim integrated 7
+3.3v, ?5kv esd-protected, fail-safe, hot-swap, rs-485/rs-422 transceivers shutdown current vs. temperature max3070e toc10 temperature (c) shutdown current (a) 100 75 25 50 0 -25 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0 0 -50 125 driver propagation delay vs. temperature (250kbps) max3070e toc11 temperature (c) driver propagation delay (ns) 100 75 50 25 0 -25 600 700 800 900 1000 500 -50 125 t dplh t dphl driver propagation delay vs. temperature (500kbps) max3070e toc12 temperature (c) driver propagation delay (ns) 100 75 50 25 0 -25 250 300 350 400 450 500 200 -50 125 t dplh t dphl driver propagation delay vs. temperature (16mbps) max3070e toc13 temperature (c) driver propagation delay (ns) 100 75 50 25 0 -25 5 10 15 20 25 30 0 -50 125 t dplh t dphl receiver propagation delay vs. temperature (250kbps and 500kbps) max3070e toc14 temperature (c) driver propagation delay (ns) 100 75 50 25 0 -25 30 60 90 120 150 0 -50 125 t dplh t dphl receiver propagation delay vs. temperature (16mbps) max3070e toc15 temperature (c) receiver propagation delay (ns) 1007550250-25 10 20 30 40 50 60 70 0 -50 125 t dplh t dphl driver propagation delay (250kbps) max3070e toc16 1s/div v y - v z 2v/div di 2v/div receiver propagation delay (250kbps and 500kbps) max3070e toc17 200ns/div v a - v b 1v/div ro 2v/div typical operating characteristics (continued) (v cc = 3.3v, t a = +25?, unless otherwise noted. note: the max3077emsa/pr meets specification over temperature.) max3070e?max3079e 8 maxim integrated
+3.3v, ?5kv esd-protected, fail-safe, hot-swap, rs-485/rs-422 transceivers test circuits and waveforms driver propagation delay (500kbps) max3070e toc18 400ns/div v y - v z 2v/div di 2v/div driver propagation delay (16mbps) max3070e toc19 10ns/div v z 1v/div v y 1v/div di 2v/div receiver propagation delay (16mbps) max3070e toc20 20ns/div v a 1v/div v b 1v/div ro 2v/div typical operating characteristics (continued) (v cc = 3.3v, t a = +25?, unless otherwise noted. note: the max3077emsa/pr meets specification over temperature.) y z v od v oc r l /2 r l /2 figure 1. driver dc test load di de 3v z y v od r l c l figure 2. driver timing test circuit di v cc 0 z y v o 0 -v o v o v cc /2 t dplh t dphl 1/2 v o 10% t dr 90% 90% 1/2 v o 10% t df v diff = v (y) - v (z) v diff t skew = | t dplh - t dphl | figure 3. driver propagation delays max3070eCmax3079e maxim integrated 9
+3.3v, ?5kv esd-protected, fail-safe, hot-swap, rs-485/rs-422 transceivers test circuits and waveforms (continued) de out t dhz 0 v cc v cc / 2 0.25v 0 v oh generator 0 or 3v s1 50 d out t dzh , t dzh(shdn) v om = (0 + v oh ) / 2 r l = 500 c l 50pf figure 4. driver enable and disable times (t dhz , t dzh , t dzh(shdn) ) de v cc out t dlz 0 v cc v cc / 2 generator 0 or 3v s1 50 d out t dzl , t dzl(shdn) v om = (v ol + v cc ) / 2 r l = 500 c l 50pf v ol 0.25v v cc figure 5. driver enable and disable times (t dzl , t dlz , t dlz(shdn) ) max3070e?max3079e 10 maxim integrated
+3.3v, ?5kv esd-protected, fail-safe, hot-swap, rs-485/rs-422 transceivers test circuits and waveforms (continued) v id r b a receiver output ate figure 6. receiver propagation delay test circuit a b ro v oh 1.5v t rplh t rphl v ol +1v -1v the rise time and fall time of inputs a and b < 4ns figure 7. receiver propagation delays s1 open s2 closed s3 = +1.5v ro 3v 0 0 v oh v oh / 2 s1 open s2 closed s3 = +1.5v t rhz 3v 0 0 v oh 0.25v 1.5v s1 closed s2 open s3 = -1.5v 3v 0 v ol v cc 1.5v s1 closed s2 open s3 = -1.5v t rlz 3v 0 v ol v cc 1.5v 0.25v generator v cc +1.5v 1k c l 15pf s2 s1 50 s3 -1.5v r v id re ro re ro re ro re t rzh , t rzh(shdn) t rzl , t rzl(shdn) (v ol + v cc ) / 2 figure 8. receiver enable and disable times max3070eCmax3079e maxim integrated 11
+3.3v, ?5kv esd-protected, fail-safe, hot-swap, rs-485/rs-422 transceivers pin description pin max3070e max3073e max3076e max3071e max3074e max3077e max3072e max3075e max3078e max3079e full-duplex devices half- duplex devices full- duple x mode half- duple x mode name function 1 1 h/ f half-/full-duplex select pin. connect h/ f to v cc for half- duplex mode; connect to gnd or leave unconnected for full-duplex mode. 2 2 1 2 2 ro receiver output. when re is low and if (a - b) -50mv, ro is high; if (a - b) -200mv, ro is low. 3 2 3 3 re receiver output enable. drive re low to enable ro; ro is high impedance when re is high. drive re high and de low to enter low-power shutdown mode. re is a hot- swap input (see the hot-swap capability section for details). 4 3 4 4 de driver output enable. drive de high to enable driver outputs. these outputs are high impedance when de is low. drive re high and de low to enter low-power shutdown mode. de is a hot-swap input (see the hot- swap capability section for details). 5 3 4 5 5 di driver input. with de high, a low on di forces noninverting output low and inverting output high. similarly, a high on di forces noninverting output high and inverting output low. 6 6 srl slew-rate limit selector pin. connect srl to ground for 16mbps communication rate; connect to v cc for 500kbps communication rate. leave unconnected for 250kbps communication rate. 6, 7 4 5 7 7 gnd ground 8 8 txp transmitter phase. connect txp to ground or leave unconnected for normal transmitter phase/polarity. connect to v cc to invert the transmitter phase/polarity. 9 5 9 y noninverting driver output 9 y noninverting driver output and noninverting receiver input* 10 6 10 z inverting driver output 10 z inverting driver output and inverting receiver input* 11 7 11 b inverting receiver input 11 b receiver input resistors* 7 b inverting receiver input and inverting driver output max3070e?max3079e 12 maxim integrated
+3.3v, ?5kv esd-protected, fail-safe, hot-swap, rs-485/rs-422 transceivers max3070e/max3073e/max3076e pin description (continued) pin max3070e max3073e max3076e max3071e max3074e max3077e max3072e max3075e max3078e max3079e full-duplex devices half- duplex devices full- duple x mode half- duple x mode name function 12 8 12 a noninverting receiver input 12 a receiver input resistors* 6 a noninverting receiver input and noninverting driver output 13 13 rxp receiver phase. connect rxp to gnd or leave unconnected for normal transmitter phase/polarity. connect to v cc to invert receiver phase/polarity. 14 1 8 14 14 v cc positive supply v cc = 3.3v 10%. bypass v cc to gnd with a 0.1f capacitor. 1, 8, 13 n.c. no connect. not internally connected. can be connected to gnd. * max3079e only. in half-duplex mode, the driver outputs serve as receiver inputs. the full-duplex receiver inputs (a and b) still have a 1/8-unit load, but are not connected to the receiver. transmitting inputs outputs re de di z y x1101 x1010 0 0 x high-z high-z 1 0 x shutdown receiving inputs output re de a, b ro 0x -50mv 1 0x -200mv 0 0x open/ shorted 1 1 1 x high-z 1 0 x shutdown max3071e/max3074e/max3077e transmitting input outputs di z y 101 010 receiving inputs output a, b ro -50mv 1 -200mv 0 open/shorted 1 function tables max3070eCmax3079e maxim integrated 13
+3.3v, ?5kv esd-protected, fail-safe, hot-swap, rs-485/rs-422 transceivers max3072e/max3075e/max3078e transmitting inputs outputs re de di b/z a/y x1101 x1010 0 0 x high-z high-z 1 0 x shutdown function tables (continued) max3079e transmitting inputs outputs txp re de di z y 0x1101 0x1010 1x1110 1x1001 x 0 0 x high-z high-z x 1 0 x shutdown receiving inputs outputs h/f rxp re de a, b y, z ro 0 0 0 x > -50mv x 1 0 0 0 x < -200mv x 0 0 1 0 x > -50mv x 0 0 1 0 x < -200mv x 1 1000x> -50mv 1 1000x< -200mv 0 1100x> -50mv 0 1100x< -200mv 1 0 0 0 x open/shorted x 1 1000x open/shorted 1 0 1 0 x open/shorted x 0 1100x open/shorted 0 x x 1 1 x x high-z x x 1 0 x x shutdown receiving inputs outputs re de a-b ro 0x -50mv 1 0x -200mv 0 0x open/ shorted 1 1 1 x high-z 1 0 x shutdown x = don? care; shutdown mode, driver and receiver outputs are high impedance. max3070e?max3079e 14 maxim integrated
detailed description the max3070e?ax3079e high-speed transceivers for rs-485/rs-422 communication contain one driver and one receiver. these devices feature fail-safe circuitry, which guarantees a logic-high receiver output when the receiver inputs are open or shorted, or when they are connected to a terminated transmission line with all dri- vers disabled (see the fail-safe section). the max3070e/max3072e/max3073e/max3075e/ max3076e/max3078e/max3079e also feature a hot- swap capability allowing line insertion without erro- neous data transfer (see the hot swap capability section). the max3070e/max3071e/max3072e feature reduced slew-rate drivers that minimize emi and reduce reflections caused by improperly terminated cables, allowing error-free data transmission up to 250kbps. the max3073e/max3074e/max3075e also offer slew-rate limits allowing transmit speeds up to 500kbps. the max3076e/max3077e/max3078es?dri- ver slew rates are not limited, making transmit speeds up to 16mbps possible. the max3079e? slew rate is selectable between 250kbps, 500kbps, and 16mbps by driving a selector pin with a three-state driver. the max3072e/max3075e/max3078e are half-duplex transceivers, while the max3070e/max3071e/ max3073e/max3074e/max3076e/max3077e are full- duplex transceivers. the max3079e is selectable between half- and full-duplex communication by driving a selector pin (srl) high or low, respectively. all devices operate from a single 3.3v supply. drivers are output short-circuit current limited. thermal-shutdown cir- cuitry protects drivers against excessive power dissipa- tion. when activated, the thermal-shutdown circuitry places the driver outputs into a high-impedance state. receiver input filtering the receivers of the max3070e?ax3075e, and the max3079e when operating in 250kbps or 500kbps mode, incorporate input filtering in addition to input hysteresis. this filtering enhances noise immunity with differential signals that have very slow rise and fall times. receiver propagation delay increases by 25% due to this filtering. fail-safe the max3070e family guarantees a logic-high receiver output when the receiver inputs are shorted or open, or when they are connected to a terminated transmission line with all drivers disabled. this is done by setting the receiver input threshold between -50mv and -200mv. if the differential receiver input voltage (a - b) is greater than or equal to -50mv, ro is logic high. if a - b is less than or equal to -200mv, ro is logic low. in the case of a terminated bus with all transmitters disabled, the receiver? differential input voltage is pulled to 0v by the termination. with the receiver thresholds of the max3070e family, this results in a logic high with a 50mv minimum noise margin. unlike previous fail-safe devices, the -50mv to -200mv threshold complies with the ?00mv eia/tia-485 standard. hot-swap capability (except max3071e/max3074e/max3077e) hot-swap inputs when circuit boards are inserted into a hot, or pow- ered, backplane, differential disturbances to the data bus can lead to data errors. upon initial circuit board insertion, the data communication processor under- goes its own power-up sequence. during this period, the processor? logic-output drivers are high imped- ance and are unable to drive the de and re inputs of these devices to a defined logic level. leakage cur- rents up to ?0? from the high-impedance state of the processor? logic drivers could cause standard cmos enable inputs of a transceiver to drift to an incorrect logic level. additionally, parasitic circuit board capaci- tance could cause coupling of v cc or gnd to the enable inputs. without the hot-swap capability, these factors could improperly enable the transceiver? driver or receiver. when v cc rises, an internal pulldown circuit holds de low and re high. after the initial power-up sequence, the pulldown circuit becomes transparent, resetting the hot-swap tolerable input. hot-swap input circuitry the enable inputs feature hot-swap capability. at the input there are two nmos devices, m1 and m2 (figure 9). when v cc ramps from zero, an internal 10? timer turns on m2 and sets the sr latch, which also turns on m1. transistors m2, a 500? current sink, and m1, a 100? current sink, pull de to gnd through a 5k resistor. m2 is designed to pull de to the disabled state against an external parasitic capacitance up to 100pf that can drive de high. after 10?, the timer deactivates m2 while m1 remains on, holding de low against three-state leakages that can drive de high. m1 remains on until an external source overcomes the required input current. at this time, the sr latch resets and m1 turns off. when m1 turns off, de reverts to a standard, high-impedance cmos input. whenever v cc drops below 1v, the hot-swap input is reset. for re there is a complementary circuit employing two pmos devices pulling re to v cc . +3.3v, ?5kv esd-protected, fail-safe, hot-swap, rs-485/rs-422 transceivers max3070eCmax3079e maxim integrated 15
max3079e programming the max3079e has several programmable operating modes. transmitter rise and fall times are programma- ble, resulting in maximum data rates of 250kbps, 500kbps, and 16mbps. to select the desired data rate, drive srl to one of three possible states by using a three-state driver: v cc , gnd, or unconnected. for 250kbps operation, set the three-state device in high- impedance mode or leave srl unconnected. for 500kbps operation, drive srl high or connect it to v cc . for 16mbps operation, drive srl low or connect it to gnd. srl can be changed during operation without interrupting data communications. occasionally, twisted-pair lines are connected backward from normal orientation. the max3079e has two pins that invert the phase of the driver and the receiver to correct this problem. for normal operation, drive txp and rxp low, connect them to ground, or leave them unconnect- ed (internal pulldown). to invert the driver phase, drive txp high or connect it to v cc . to invert the receiver phase, drive rxp high or connect it to v cc . note that the receiver threshold is positive when rxp is high. the max3079e can operate in full- or half-duplex mode. drive the h/f pin low, leave it unconnected (internal pulldown), or connect it to gnd for full-duplex operation. drive h/f high for half-duplex operation. in full-duplex mode, the pin configuration of the driver and receiver is the same as that of a max3070e. in half- duplex mode, the receiver inputs are switched to the driver outputs, connecting outputs y and z to inputs a and b, respectively. in half-duplex mode, the internal full-duplex receiver input resistors are still connected to pins 11 and 12. ?5kv esd protection as with all maxim devices, esd-protection structures are incorporated on all pins to protect against electro- static discharges encountered during handling and assembly. the driver outputs and receiver inputs of the max3070e family of devices have extra protection against static electricity. maxim? engineers have devel- oped state-of-the-art structures to protect these pins against esd of ?5kv without damage. the esd struc- tures withstand high esd in all states: normal operation, shutdown, and powered down. after an esd event, the max3070e?ax3079e keep working without latchup or damage. esd protection can be tested in various ways. the transmitter outputs and receiver inputs of the max3070e?ax3079e are characterized for protection to the following limits: ? ?5kv using the human body model ? ?kv using the contact discharge method specified in iec 1000-4-2 esd test conditions esd performance depends on a variety of conditions. contact maxim for a reliability report that documents test setup, test methodology, and test results. human body model figure 10a shows the human body model, and figure 10b shows the current waveform it generates when dis- charged into a low impedance. this model consists of a 100pf capacitor charged to the esd voltage of interest, which is then discharged into the test device through a 1.5k resistor. iec 1000-4-2 the iec 1000-4-2 standard covers esd testing and performance of finished equipment. however, it does not specifically refer to integrated circuits. the max3070e family of devices helps you design equip- ment to meet iec 1000-4-2, without the need for addi- tional esd-protection components. the major difference between tests done using the human body model and iec 1000-4-2 is higher peak +3.3v, ?5kv esd-protected, fail-safe, hot-swap, rs-485/rs-422 transceivers de de (hot swap) 5k timer timer v cc 10s m2 m1 500a 100a sr latch figure 9. simplified structure of the driver enable pin (de) max3070e?max3079e 16 maxim integrated
current in iec 1000-4-2, because series resistance is lower in the iec 1000-4-2 model. hence, the esd with- stand voltage measured to iec 1000-4-2 is generally lower than that measured using the human body model. figure 10c shows the iec 1000-4-2 model, and figure 10d shows the current waveform for iec 1000-4-2 esd contact discharge test. the air-gap test involves approaching the device with a charged probe. the contact-discharge method connects the probe to the device before the probe is energized. machine model the machine model for esd tests all pins using a 200pf storage capacitor and zero discharge resis- tance. the objective is to emulate the stress caused when i/o pins are contacted by handling equipment during test and assembly. of course, all pins require this protection, not just rs-485 inputs and outputs. applications information 256 transceivers on the bus the standard rs-485 receiver input impedance is 12k (1-unit load), and the standard driver can drive up to 32- unit loads. the max3070e family of transceivers has a 1/8-unit load receiver input impedance (96k ), allowing up to 256 transceivers to be connected in parallel on one communication line. any combination of these devices as well as other rs-485 transceivers with a total of 32- unit loads or fewer can be connected to the line. reduced emi and reflections the max3070e/max3071e/max3072e feature reduced slew-rate drivers that minimize emi and reduce reflec- tions caused by improperly terminated cables, allowing error-free data transmission up to 250kbps. the max3073e/max3074e/max3075e offer higher driver output slew-rate limits, allowing transmit speeds up to 500kbps. the max3079e with srl = v cc or uncon- nected, are slew-rate limited. with srl unconnected, the max3079e error-free data transmission is up to 250kbps; with srl connected to v cc the data transmit speeds up to 500kbps. +3.3v, ?5kv esd-protected, fail-safe, hot-swap, rs-485/rs-422 transceivers charge-current- limit resistor discharge resistance storage capacitor c s 100pf r c 1m r d 1500 high- voltage dc source device under test figure 10a. human body esd test model i p 100% 90% 36.8% t rl time t dl current waveform peak-to-peak ringing (not drawn to scale) i r 10% 0 0 amps figure 10b. human body current waveform charge-current- limit resistor discharge resistance storage capacitor c s 150pf r c 50m to 100m r d 330 high- voltage dc source device under test figure 10c. iec 1000-4-2 esd test model t r = 0.7ns to 1ns 30ns 60ns t 100% 90% 10% i peak i figure 10d. iec 1000-4-2 esd generator current waveform max3070eCmax3079e maxim integrated 17
low-power shutdown mode (except max3071e/max3074e/max3077e) low-power shutdown mode is initiated by bringing both re high and de low. in shutdown, the devices typically draw only 50na of supply current. re and de can be driven simultaneously; the parts are guaranteed not to enter shutdown if re is high and de is low for less than 50ns. if the inputs are in this state for at least 600ns, the parts are guaranteed to enter shutdown. enable times t zh and t zl (see the switching characteristics section) assume the part was not in a low-power shutdown state. enable times t zh(shdn) and t zl(shdn) assume the parts were shut down. it takes drivers and receivers longer to become enabled from low-power shutdown mode (t zh(shdn) , t zl(shdn) ) than from driver/receiver-disable mode (t zh , t zl ). driver output protection two mechanisms prevent excessive output current and power dissipation caused by faults or by bus contention. the first, a foldback current limit on the output stage, provides immediate protection against short circuits over the whole common-mode voltage range (see the typical operating characteristics ). the second, a thermal-shut- down circuit, forces the driver outputs into a high-imped- ance state if the die temperature becomes excessive. line length the rs-485/rs-422 standard covers line lengths up to 4000ft. for line lengths greater than 4000ft, use the repeater application shown in figure 11. typical applications the max3072e/max3075e/max3078e/max3079e transceivers are designed for bidirectional data commu- nications on multipoint bus transmission lines. figures 12 and 13 show typical network applications circuits. to minimize reflections, terminate the line at both ends in its characteristic impedance, and keep stub lengths off the main line as short as possible. the slew-rate-lim- ited max3072e/max3075e and the two modes of the max3079e are more tolerant of imperfect termination. chip information transistor count: 1228 process: bicmos +3.3v, ?5kv esd-protected, fail-safe, hot-swap, rs-485/rs-422 transceivers ro di de r d max3070e/max3071e/max3073e/ max3074e/max3076e/max3077e/ max3079e (full-duplex) re 120 120 a b z y data in data out figure 11. line repeater for max3070e/max3071e/max3073e/ max3074e/max3076e/max3077e/max3079e in full-duplex mode di ro de a b re ro ro ro di di di de de de d d d r r r bb b a a a 120 120 d r max3072e max3075e max3078e max3079e (half-duplex) re re re figure 12. typical half-duplex rs-485 network max3070e?max3079e 18 maxim integrated
+3.3v, ?5kv esd-protected, fail-safe, hot-swap, rs-485/rs-422 transceivers ro di de r 120 120 d max3070e max3073e max3076e max3079e (full-duplex) re ro di de r d re 120 120 a b z y a b z y ro di de r d re yzba ro di de r d re yzba figure 13. typical full-duplex rs-485 network selector guide part half/full- duplex data rate (mbps) slew-rate limited low-power shutdown receiver/ driver enable transceivers on bus pins max3070e full 0.250 yes yes yes 256 14 max3071e full 0.250 yes no no 256 8 max3072e half 0.250 yes yes yes 256 8 max3073e full 0.5 yes yes yes 256 14 max3074e full 0.5 yes no no 256 8 max3075e half 0.5 yes yes yes 256 8 max3076e full 16 no yes yes 256 14 max3077e full 16 no no no 256 8 max3078e half 16 no yes yes 256 8 max3079e selectable selectable selectable yes yes 256 14 max3070eCmax3079e maxim integrated 19
+3.3v, ?5kv esd-protected, fail-safe, hot-swap, rs-485/rs-422 transceivers max3070e max3073e max3076e rt rt de v cc re gnd v cc re gnd de ro di 9 10 12 11 b a z y 0.1f 5 ro n.c. di 2 1, 8, 13 3 6, 7 14 4 v cc n.c. n.c. a b z y n.c. ro re de di gnd gnd d d r d r typical full-duplex operating circuit 14 13 12 11 10 9 8 1 2 3 4 5 6 7 dip/so r pin configurations and typical operating circuits max3071e max3074e max3077e rt rt v cc gnd v cc gnd ro di 5 6 8 7 b a z y 0.1f 3 ro di 2 4 1 r d d r d r typical full-duplex operating circuit v cc ro di gnd a b z y 8 7 6 5 1 2 3 4 dip/so max3072e max3075e max3078e rt rt de re b a b a 0.1f typical half-duplex operating circuit note: pin labels y and z on timing, test, and waveforms diagrams. refer to pins a and b when de is high. r d ro di v cc b a gnd 8 7 6 5 1 2 3 4 dip/so re de r d ro di v cc gnd 8 7 6 5 1 2 3 4 re de d r di ro max3070e?max3079e 20 maxim integrated
+3.3v, ?5kv esd-protected, fail-safe, hot-swap, rs-485/rs-422 transceivers 14 13 12 11 10 9 8 1 2 3 4 5 6 7 max3079e max3079e dip/so top view v cc v cc rxp txp a b z y ro de di srl gnd re h/f ro txp a b z y gnd de srl di h/f rxp note: switch positions indicated for h/f = gnd. re pin configurations and typical operating circuits (continued) max3070eCmax3079e maxim integrated 21
+3.3v, ?5kv esd-protected, fail-safe, hot-swap, rs-485/rs-422 transceivers ordering information (continued) part? temp range pin-package max3072e epa -40c to +85c 8 plastic dip max3072eesa -40c to +85c 8 so max3072eapa -40c to +125c 8 plastic dip max3072easa -40c to +125c 8 so max3073e epd -40c to +85c 14 plastic dip max3073eesd -40c to +85c 14 so max3073eapd -40c to +125c 14 plastic dip max3073easd -40c to +125c 14 so max3074e epa -40c to +85c 8 plastic dip max3074eesa -40c to +85c 8 so max3074eapa -40c to +125c 8 plastic dip max3074easa -40c to +125c 8 so max3075e epa -40c to +85c 8 plastic dip max3075eesa -40c to +85c 8 so max3075eapa -40c to +125c 8 plastic dip max3075easa -40c to +125c 8 so part? temp range pin-package max3076e epd -40c to +85c 14 plastic dip max3076eesd -40c to +85c 14 so max3076eapd -40c to +125c 14 plastic dip max3076easd -40c to +125c 14 so max3077e epa -40c to +85c 8 plastic dip max3077eesa -40c to +85c 8 so max3077eapa -40c to +125c 8 plastic dip max3077easa -40c to +125c 8 so max3077emsa/pr -55c to +125c 8 so max3078e epa -40c to +85c 8 plastic dip max3078eesa -40c to +85c 8 so max3078eapa -40c to +125c 8 plastic dip max3078easa -40c to +125c 8 so max3079e epd -40c to +85c 14 plastic dip max3079eesd -40c to +85c 14 so max3079eapd -40c to +125c 14 plastic dip max3079easd -40c to +125c 14 so ?devices are available in both leaded (pb) and lead(pb)-free packaging. specify lead-free by adding a ??after the part number. package type package code document no. 8 plastic dip p8-2 21-0043 14 plastic dip p14-3 8 so s8-4 21-0041 14 so s14-1 package information for the latest package outline information and land patterns, go to www.maxim-ic.com/packages . note that a ?? ?? or ??in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to th e package regardless of rohs status. max3070e?max3079e 22 maxim integrated
+3.3v, ?5kv esd-protected, fail-safe, hot-swap, rs-485/rs-422 transceivers package information (continued) for the latest package outline information and land patterns, go to www.maxim-ic.com/packages . note that a ?? ?? or ??in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to th e package regardless of rohs status. soicn .eps package outline, .150" soic 1 1 21-0041 b rev. document control no. approval proprietary information title: top view front view max 0.010 0.069 0.019 0.157 0.010 inches 0.150 0.007 e c dim 0.014 0.004 b a1 min 0.053 a 0.19 3.80 4.00 0.25 millimeters 0.10 0.35 1.35 min 0.49 0.25 max 1.75 0.050 0.016 l 0.40 1.27 0.394 0.386 d d min dim d inches max 9.80 10.00 millimeters min max 16 ac 0.337 0.344 ab 8.75 8.55 14 0.189 0.197 aa 5.00 4.80 8 n ms012 n side view h 0.244 0.228 5.80 6.20 e 0.050 bsc 1.27 bsc c h e e b a1 a d 0 -8 l 1 variations: max3070eCmax3079e maxim integrated 23
revision history revision number revision date description pages changed 0 10/02 initial release. 2 4/09 added /pr information to reflect new characterization information for military temperature version. 2, 3, 7, 8, 12, 13, 19, 22C25 +3.3v, ?5kv esd-protected, fail-safe, hot-swap, rs-485/rs-422 transceivers max3070e?max3079e 24 maxim integrated 160 rio robles, san jose, ca 95134 usa 1-408-601-1000 maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. the parametric values (min and max limits) shown in the electrical characteristics table are guaranteed. other parametric values quoted in this data sheet are provided for guidance. ? 2009 maxim integrated the maxim logo and maxim integrated are trademarks of maxim integrated products, inc.

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