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selector guide *pin compatible with 75180, with additional features implemented using pins 1, 6, 8, and 13. MAX3080E?ax3089e ?5kv esd-protected, fail-safe, high-speed (10mbps), slew-rate-limited rs-485/rs-422 transceivers ________________________________________________________________ maxim integrated products 1 19-1800; rev 0; 9/00 ordering information continued at end of data sheet. ordering information general description the MAX3080E?ax3089e are ?5kv electrostatic dis- charge (esd)-protected, high-speed transceivers for rs- 485/rs-422 communication that 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. this means that the receiver output will be a logic high if all transmitters on a terminated bus are disabled (high impedance). the MAX3080E/max3081e/max3082e feature reduced slew-rate drivers that minimize emi and reduce reflec- tions caused by improperly terminated cables, allowing error-free data transmission up to 115kbps. the max3083e/max3084e/max3085e offer higher driver output slew-rate limits, allowing transmit speeds up to 500kbps. the max3086e/max3087e/ max3088es?dri- ver slew rates are not limited, making transmit speeds up to 10mbps possible. the max3089e? slew rate is selectable between 115kbps, 500kbps, and 10mbps by driving a selector pin with a single three-state driver. all devices feature enhanced esd protection. all transmitter outputs and receiver inputs are protected to ?5kv using the human body model. these transceivers typically draw 375? of supply current when unloaded, or when fully loaded with the dri- vers disabled. all devices have a 1/8-unit-load receiver input impedance that allows up to 256 transceivers on the bus. the max3082e/max3085e/max3088e are intended for half- duplex communications, while the MAX3080E/max3081e/ max3083e/max3084e/max3086e/max3087e are intended for full-duplex communications. the max3089e is selectable between half-duplex and full-duplex opera- tion. it also features independently programmable receiver and transmitter output phase via separate pins. features esd protection for rs-485 i/o pins 15kv, human body model true fail-safe receiver while maintaining eia/tia-485 compatibility enhanced slew-rate limiting facilitates error-free data transmission (MAX3080E?ax3085e/max3089e) 1na low-current shutdown mode (except max3081e/max3084e/max3087e) pin-selectable full/half-duplex operation (max3089e) phase controls to correct for twisted-pair reversal (max3089e) allow up to 256 transceivers on the bus applications rs-422/rs-485 communications level translators transceivers for emi-sensitive applications industrial-control local area networks part temp. range pin-package MAX3080E csd 0? to +70? 14 so MAX3080Ecpd 0? to +70? 14 plastic dip MAX3080Eesd -40? to +85? 14 so MAX3080Eepd -40? to +85? 14 plastic dip part half/full duplex data rate (mbps) slew- rate limited low- power shutdown receiver/ driver enable quiescent current (a) transceivers on bus (a) pin count industry- standard pinout 75180 14 256 375 yes yes yes 0.115 75179 75176 75180 75179 75176 75180 75179 75176 75180* 14 8 8 14 8 8 14 8 8 256 256 256 256 256 256 256 256 256 375 375 375 375 375 375 375 375 375 no yes yes no yes yes no yes yes yes yes no yes yes no yes yes no yes yes yes yes yes no no no selectable selectable 10 10 10 0.5 0.5 0.5 0.115 0.115 selectable half full full half full full half full full MAX3080E max3081e max3082e max3083e max3084e max3085e max3086e max3087e max3088e max3089e for free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800. for small orders, phone 1-800-835-8769.
MAX3080E?ax3089e ?5kv esd-protected, fail-safe, high-speed (10mbps), slew-rate-limited rs-485/rs-422 transceivers 2 _______________________________________________________________________________________ absolute maximum ratings dc electrical characteristics (v cc = +5v 5%, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v and t a = +25?.) (note 1) stresses beyond those listed under ?bsolute maximum ratings?may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specificatio ns is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. supply voltage (v cc ) ............................................................+7v control input voltage ( re , de)...................-0.3v to (v cc + 0.3v) special input voltage (h/ f , srl, txp, rxp)..............................-0.3v to (v cc + 0.3v) driver input voltage (di).............................-0.3v to (v cc + 0.3v) driver output voltage (a, b, y, z)........................................?3v receiver input voltage (a, b) ..............................................?3v receiver input voltage, full duplex (a, b) ..........................?5v receiver output voltage (ro)....................-0.3v to (v cc + 0.3v) continuous power dissipation 8-pin plastic dip (derate 9.09mw/? above +70?) ...727mw 8-pin so (derate 5.88mw/? above +70?)................471mw 14-pin plastic dip (derate 10.0mw/? above +70?) ....800mw 14-pin so (derate 8.33mw/? above +70?)..............667mw operating temperature ranges max308_ec_ _ ...................................................0? to +70? max308_ee_ _ ................................................-40? to +85? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? figure 5, r = 50 ? (rs-422) de = gnd, v cc = gnd or 5.25v de = gnd, v cc = gnd or 5.25v h/ f , txp, rxp, internal pulldown de, di, re srl = v cc srl MAX3080E?ax3085e, and max3089e with srl = v cc or unconnected de, di, re , h/ f , txp, rxp figure 5, r = 50 ? or r = 27 ? figure 5, r = 50 ? or r = 27 ? figure 5, r = 50 ? or r = 27 ? srl (note 3) de, di, re , h/ f , txp, rxp srl conditions ? 125 i o output leakage (y and z) full duplex ? 125 i in4 input current (a and b) ? 75 i in3 srl input current v 0.8 v il2 input low voltage v 0.4v cc 0.6v cc v im2 input middle voltage v v cc - 0.8 v ih2 input high voltage v 2.0 v od2 differential driver output 10 40 i in2 ? ? i in1 srl input current mv 100 v hys di input hysteresis v 0.8 v il1 input low voltage v 0.2 ? v od change-in-magnitude of differential output voltage (note 2) v 3 v oc driver common-mode output voltage v 0.2 ? v oc change-in-magnitude of common-mode voltage (note 2) v 2.0 v ih1 input high voltage units min typ max symbol parameter figure 5, r = 27 ? (rs-485) 1.5 srl = gnd (note 3) -75 v in = 12v v in = 12v v in = -7v -100 -75 v in = -7v figure 5 v 5 v od1 differential driver output (no load) ma v od1 driver short-circuit output current (note 4) driver -7v v out v cc -250 0v v out 12v 0v v out v cc ?5 250
MAX3080E?ax3089e ?5kv esd-protected, fail-safe, high-speed (10mbps), slew-rate-limited rs-485/rs-422 transceivers _______________________________________________________________________________________ 3 dc electrical characteristics (continued) (v cc = +5v ?%, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v and t a = +25?.) (note 1) 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 srl pin is internally biased to v cc / 2 by a 100k ? /100k ? resistor-divider. it is guaranteed to be v cc / 2 if left unconnected. note 4: maximum current level applies to peak current just prior to foldback-current limiting; minimum current level applies during current limiting. 375 600 430 900 de = gnd de = gnd 475 1000 ? 420 800 de = v cc de = v cc no load, re = di = gnd or v cc , srl = gnd parameter symbol min typ max units receiver output low voltage v ol 0.4 v receiver output high voltage v oh v cc -1.5 v receiver input hysteresis ? v th 25 mv receiver differential threshold voltage v th -200 -125 -50 mv three-state output current at receiver i ozr ? ? receiver input resistance r in 96 k ? receiver output short-circuit current i osr ? ?5 ma supply current i cc ? supply current in shutdown mode i shdn 0.001 10 ? conditions no load, re = di = gnd or v cc , srl = v cc i o = 4ma, v id = -200mv de = gnd, v re = v cc i o = -4ma, v id = -50mv -7v v cm 12v 0.4v v o 2.4v -7v v cm 12v 0v v ro v cc esd protection for y, z, a, b ?5 kv human body model receiver supply current
MAX3080E?ax3089e ?5kv esd-protected, fail-safe, high-speed (10mbps), slew-rate-limited rs-485/rs-422 transceivers 4 _______________________________________________________________________________________ switching characteristics?ax3080e/max3081e/max3082e, and max3089e with srl = unconnected (v cc = +5v ?%, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v and t a = +25?.) 500 2030 2600 t dphl parameter symbol min typ max units driver disable time from low t dlz 100 ns driver enable to output low t dzl 3500 ns driver enable to output high t dzh 3500 ns maximum data rate f max 115 kbps driver disable time from high t dhz 100 ns receiver input to output t rplh , t rphl 127 200 ns | t rplh - t rphl | differential receiver skew t rskd 330 ns receiver enable to output low t rzl 20 50 ns driver output skew | t dplh - t dphl | driver input-to-output t dplh 500 2030 2600 ns t dskew -3 ?00 ns driver rise or fall time t dr , t df 667 1320 2500 ns receiver enable to output high t rzh 20 50 ns receiver disable time from low t rlz 20 50 ns receiver disable time from high t rhz 20 50 ns time to shutdown t shdn 50 200 600 ns driver enable from shutdown to output high t dzh(shdn) 6000 ns driver enable from shutdown to output low t dzl(shdn) 6000 ns receiver enable from shutdown- to-output high t rzh(shdn) 3500 ns receiver enable from shutdown- to-output low t rzl(shdn) 3500 ns conditions figures 6 and 12, c l = 100pf, s2 closed figures 8 and 10, c l = 15pf, s1 closed figures 6 and 12, c l = 100pf, s1 closed figures 8 and 10, c l = 100pf, s1 closed figures 8 and 10, c l = 100pf, s2 closed figures 8 and 10, c l = 15pf, s2 closed figures 11 and 13; | v id | 2.0v; rise and fall time of v id 15ns figures 6 and 12, c l = 100pf, s2 closed (note 5) figures 11 and 13; | v id | 2.0v; rise and fall time of v id 15ns figures 6 and 12, c l = 100pf, s1 closed figures 8 and 10, c l = 15pf, s2 closed figures 8 and 10, c l = 15pf, s1 closed figures 6 and 12, c l = 100pf, s2 closed figures 7 and 9, r diff = 54 ? , c l1 = c l2 = 100pf figures 6 and 12, c l = 100pf, s1 closed figures 7 and 9, r diff = 54 ? , c l1 = c l2 = 100pf figures 7 and 9, r diff = 54 ? , c l1 = c l2 = 100pf
MAX3080E?ax3089e ?5kv esd-protected, fail-safe, high-speed (10mbps), slew-rate-limited rs-485/rs-422 transceivers _______________________________________________________________________________________ 5 switching characteristics?ax3083e/max3084e/max3085e, and max3089e with srl = v cc (v cc = +5v ?%, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v and t a = +25?.) receiver enable from shutdown-to-output low t rzl(shdn) figures 6 and 12, c l = 100pf, s1 closed 3500 ns ns 3500 figures 6 and 12, c l = 100pf, s2 closed t rzh(shdn) receiver enable from shutdown-to-output high driver enable from shutdown-to-output low t dzl(shdn) figures 8 and 10, c l = 15pf, s1 closed 4500 ns ns 4500 figures 8 and 10, c l = 15pf, s2 closed t dzh(shdn) driver enable from shutdown-to-output high time to shutdown t shdn (note 5) 50 200 600 ns ns 20 50 figures 6 and 12, c l = 100pf, s2 closed t rhz receiver disable time from high receiver disable time from low t rlz figures 6 and 12, c l = 100pf, s1 closed 20 50 ns ns 20 50 figures 6 and 12, c l = 100pf, s2 closed t rzh receiver enable to output high receiver enable to output low t rzl figures 6 and 12, c l = 100pf, s1 closed 20 50 ns ns 330 figures 11 and 13; | v id | 2.0v; rise and fall time of v id 15ns t rskd | t rplh - t rphl | differential receiver skew receiver input to output t rplh , t rphl figures 11 and 13; | v id | 2.0v; rise and fall time of v id 15ns 127 200 ns ns 100 figures 8 and 10, c l = 15pf, s2 closed t dhz driver disable time from high driver disable time from low t dlz figures 8 and 10, c l = 15pf, s1 closed 100 ns ns 2500 figures 8 and 10, c l = 100pf, s1 closed t dzl driver enable to output low driver enable to output high t dzh figures 8 and 10, c l = 100pf, s2 closed 2500 ns kbps 500 f max maximum data rate driver rise or fall time t dr, t df figures 7 and 9, r diff = 54 ? , c l1 = c l2 = 100pf 200 530 750 ns ns -3 ?00 figures 7 and 9, r diff = 54 ? , c l1 = c l2 = 100pf t dskew driver output skew | t dplh - t dphl | driver input-to-output t dphl t dplh figures 7 and 9, r diff = 54 ? , c l1 = c l2 = 100pf 250 720 1000 250 720 1000 ns units min typ max conditions symbol parameter
MAX3080E?ax3089e ?5kv esd-protected, fail-safe, high-speed (10mbps), slew-rate-limited rs-485/rs-422 transceivers 6 _______________________________________________________________________________________ switching characteristics?ax3086e/max3087e/max3088e, and max3089e with srl = gnd (v cc = +5v ?%, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v and t a = +25?.) note 5: the device is put into shutdown by bringing re high and de low. if the enable inputs are in this state for less than 50ns, the device is guaranteed not to enter shutdown. if the enable inputs are in this state for at least 600ns, the device is guaranteed to have entered shutdown. units min typ max conditions symbol parameter driver input-to-output t dplh t dphl figures 7 and 9, r diff = 54 ? , c l1 = c l2 = 100pf 34 60 34 60 ns ns -2.5 ?0 figures 7 and 9, r diff = 54 ? , c l1 = c l2 = 100pf t dskew driver output skew | t dplh - t dphl | driver rise or fall time t dr, t df figures 7 and 9, r diff = 54 ? , c l1 = c l2 = 100pf 14 25 ns maximum data rate f max 10 mbps driver enable to output high t dzh figures 8 and 10, c l = 100pf, s2 closed 150 ns ns 150 figures 8 and 10, c l = 100pf, s1 closed t dzl driver enable to output low driver disable time from low t dlz figures 8 and 10, c l = 15pf, s1 closed 100 ns ns 100 figures 8 and 10, c l = 15pf, s2 closed t dhz driver disable time from high receiver input-to-output t rplh , t rphl figures 11 and 13; | v id | 2.0v; rise and fall time of v id 15ns 106 150 ns ns 010 figures 11 and 13; | v id | 2.0v; rise and fall time of v id 15ns t rskd | t rplh - t rphl | differential receiver skew t rzl figures 6 and 12, c l = 100pf, s1 closed 20 50 ns ns ns ns ns ns ns ns ns 3500 3500 250 250 50 200 600 20 50 20 50 20 50 figures 6 and 12, c l = 100pf, s2 closed figures 6 and 12, c l = 100pf, s1 closed figures 6 and 12, c l = 100pf, s2 closed (note 5) figures 8 and 10, c l = 15pf, s2 closed figures 8 and 10, c l = 15pf, s1 closed figures 6 and 12, c l = 100pf, s2 closed figures 6 and 12, c l = 100pf, s1 closed t rzl(shdn) t rzh(shdn) t dzl(shdn) t dzh(shdn) t shdn t rhz t rlz t rzh receiver enable to output low receiver enable to output high receiver disable time from low receiver disable time from high time to shutdown driver enable from shutdown-to-output high driver enable from shutdown-to-output low receiver enable from shutdown-to-output high receiver enable from shutdown-to-output low
MAX3080Eemax3089e 15kv esd-protected, fail-safe, high-speed (10mbps), slew-rate-limited rs-485/rs-422 transceivers _______________________________________________________________________________________ 7 300 -60 100 no-load supply current vs. temperature 350 325 525 max3080/3089 toc-16 temperature ( c) no-load supply current ( a) 40 450 425 375 400 060 500 475 -40 -20 20 80 a: max3086e/max3087e/max3088e, max3089e with srl = gnd b: MAX3080E?ax3085e, max3089e with srl = open or v cc a a b de = v cc de = gnd b 0 10 05 output current vs. receiver output low voltage 20 60 max3080/3089 toc-2 output low voltage (v) output current (ma) 3 40 30 2 50 14 0 5 05 output current vs. receiver output high voltage 10 30 max3080/3089 toc-3 output high voltage (v) output current (ma) 3 20 15 2 25 14 0 2 -60 100 shutdown current vs. temperature 4 6 20 max3080/3089 toc-1 temperature ( c) shutdown current (na) 40 12 14 10 8 06 0 16 18 -40 -20 20 80 0.10 0.15 -60 80 100 receiver output low voltage vs. temperature 0.20 0.50 max3080/3089 toc-5 temperature ( c) output low voltage (v) 20 0.40 0.35 0.30 0.25 040 0.45 -40 -20 60 i ro = 8ma 3.8 3.9 -60 80 100 receiver output high voltage vs. temperature 4 0 4 5 max3080/3089 toc-4 temperature ( c) output voltage (v) 20 4 3 4 2 4.1 040 4.4 -40 -20 60 i ro = 8ma 115 -60 100 receiver propagation delay (500kbps mode) vs. temperature 120 140 max3080/3089 toc-7 temperature ( c) propagation delay (ns) 40 130 125 060 135 -40 -20 20 80 c load = 100pf 94 -60 100 receiver propagation delay (10mbps mode) vs. temperature 98 96 112 max3080/3089 toc-8 temperature ( c) propagation delay (ns) 40 106 104 100 102 060 110 108 -40 -20 20 80 c load = 100pf 1.90 -60 100 driver propagation delay (115kbps mode) vs. temperature 1.95 2.20 max3080/3089 toc-9 temperature ( c) propagation delay ( s) 40 2.10 2.00 2.05 060 2.15 -40 -20 20 80 r t = 54 typical operating characteristics (v cc = +5v, t a = +25?c, unless otherwise noted.)
MAX3080Eemax3089e 15kv esd-protected, fail-safe, high-speed (10mbps), slew-rate-limited rs-485/rs-422 transceivers 8 _______________________________________________________________________________________ typical operating characteristics (continued) (v cc = +5v, t a = +25?c, unless otherwise noted.) 520 560 -60 100 driver propagation delay (500kbps mode) vs. temperature 600 640 920 max3080/3089 toc-10 temperature ( c) propagation delay (ns) 40 760 800 720 680 060 840 880 -40 -20 20 80 r t = 54 20 25 -60 100 driver propagation delay (10mbps mode) vs. temperature 30 60 max3080/3089 toc-11 temperature ( c) propagation delay (ns) 40 45 50 40 35 060 55 -40 -20 20 80 r t = 54 1.83 1.84 -60 100 driver differential output voltage vs. temperature 1.85 1.90 max3080/3089 toc-13 temperature ( c) output voltage (v) 40 1.88 1.87 1.86 060 1.89 -40 -20 20 80 r t = 54 0 -10 -20 -30 -40 -50 -60 -70 -80 -90 -100 -8 -2 output current vs. driver output high voltage max3080/3089 toc-27 output high voltage (v) output current (ma) 642 -6 -4 0 100 0 01 01 driver output current vs. differential output voltage 0.1 10 1 max3080 toc-12 differential output voltage (v) output current (ma) 23 4 5 0 20 40 60 80 100 120 140 output current vs. driver output low voltage max3080-25 output low voltage (v) output current (ma) 024681012
MAX3080Eemax3089e 15kv esd-protected, fail-safe, high-speed (10mbps), slew-rate-limited rs-485/rs-422 transceivers _______________________________________________________________________________________ 9 2s/div driver propagation delay MAX3080E/max3081e/max3082e and max3089e with srl = open di v y - v z 5v/div 2.5v/div max3080/3089 typ 20 500ns/div driver propagation delay max3083e/max3084e/max3085e and max3089e with srl = v cc di v y - v z 5v/div 2.5v/div max3080/3089 typ 21 50ns/div driver propagation delay max3086e/max3087e/max3088e and max3089e with srl = gnd di v y - v z 5v/div 2 5v/div max3080/3089 typ 22 typical operating characteristics (continued) (v cc = +5v, t a = +25?, unless otherwise noted.) 50ns/div v a - v b ro 2v/div 5v/div max3080/3089 typ 18 receiver propagation delay max3086e/max3087e/max3088e and max3089e with srl = gnd 50ns/div v a - v b ro 2v/div 5v/div max3080/3089 typ 17 receiver propagation delay MAX3080E?ax3085e and max3089e with srl = open or v cc
MAX3080E?ax3089e ?5kv esd-protected, fail-safe, high-speed (10mbps), slew-rate-limited rs-485/rs-422 transceivers 10 ______________________________________________________________________________________ pin description max3081e max3084e max3087e MAX3080E max3083e max3086e max3082e max3085e max3088e full-duplex devices half- duplex mode full- duplex mode half- duplex devices 9 5 noninverting driver output y 9 5 6 7 5 6 7 3 4 4 5 driver input. with de high, a low on di forces noninverting output low and inverting output high. similarly, a high on di forces non-inverting output high and inverting output low. di 5 slew-rate-limit selector pin. connect srl to gnd for 10mbps communication rate; connect to v cc for 500kbps communication rate. leave unconnected for 115kbps communication rate. srl ground gnd 6, 7 8 8 txp 4 4 3 driver output enable. drive de high to enable driver out- puts. these outputs are high impedance when de is low. drive re high and de low to enter low-power shutdown mode. de 4 2 3 1 2 3 1 2 1 2 receiver output. when re is low and if a - b -50mv, ro will be high; if a - b -200mv, ro will be low. ro 2 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 3 function name half/full-duplex selector pin. connect h/ f to v cc for half- duplex mode; connect to gnd or leave unconnected for full-duplex mode. h/ f transmitter phase. connect txp to gnd, or leave floating for normal transmitter phase/polarity. connect to v cc to invert the transmitter phase/polarity. 9 y noninverting receiver input and noninverting driver output* 10 6 10 z inverting driver output 10 z inverting receiver input and inverting driver output* 11 7 11 b inverting receiver input 11 b receiver input resistors* 7 b inverting receiver input and inverting driver output max3089e pin
MAX3080E?ax3089e ?5kv esd-protected, fail-safe, high-speed (10mbps), slew-rate-limited rs-485/rs-422 transceivers ______________________________________________________________________________________ 11 pin description (continued) function tables transmitting inputs outputs re de di z y x 1 1 0 1 x 1 0 1 0 0 0 x high-z high-z 1 0 x shutdown receiving inputs output re de a-b ro 0 x -0.05v 1 0 x -0.2v 0 0 x open/shorted 1 1 1 x high-z 1 0 x shutdown transmitting input outputs di z y 1 0 1 0 1 0 receiving inputs output a-b ro -0.05v 1 -0.2v 0 open/shorted 1 x = don? care shutdown mode, driver and receiver outputs high impedance * (max3089e only) in half-duplex mode, the driver outputs serve as receiver inputs. the full-duplex receiver inputs (a and b) wil l still have a 1/8-unit load, but are not connected to the receiver. max3081e/max3084e/max3087e MAX3080E/max3083e/max3086e function name not connected. not internally connected. n.c. 1, 8, 13 positive supply 4.75v v cc 5.25v v cc 14 14 8 1 14 receiver phase. connect rxp to gnd, or leave uncon- nected for normal transmitter phase/polarity. connect to v cc to invert the receiver phase/polarity: rxp 13 13 noninverting receiver input and noninverting driver output a 6 receiver input resistors* half- duplex devices full- duplex mode half- duplex mode a 12 noninverting receiver input a 12 8 12 max3081e max3084e max3087e MAX3080E max3083e max3086e max3082e max3085e max3088e max3089e full-duplex devices pin
MAX3080E?ax3089e ?5kv esd-protected, fail-safe, high-speed (10mbps), slew-rate-limited rs-485/rs-422 transceivers 12 ______________________________________________________________________________________ function tables (continued) transmitting inputs outputs re de di b/z a/y x 1 1 0 1 x 1 0 1 0 0 0 x high-z high-z 1 0 x shutdown receiving inputs output re de a-b ro 0 x -0.05v 1 0 x -0.2v 0 0 x open/shorted 1 1 1 x high-z 1 0 x shutdown max3089e transmitting inputs outputs txp re de di z y 0 x 1 1 0 1 0 x 1 0 1 0 1 x 1 1 1 0 1 x 1 0 0 1 x 0 0 x high-z high-z x 1 0 x shutdown inputs output h/ f rxp re de a-b y-z ro 0 0 0 x -0.05v x 1 0 0 0 x -0.2v x 0 0 1 0 x -0.05v x 0 0 1 0 x -0.2v x 1 1 0 0 0 x -0.05v 1 1 0 0 0 x -0.2v 0 1 1 0 0 x -0.05v 0 1 1 0 0 x -0.2v 1 0 0 0 x open/ shorted x 1 1 0 0 0 x open/ shorted 1 0 1 0 x open/ shorted x 0 1 1 0 0 x open/ shorted 0 x x 1 1 x x high-z x x 1 0 x x shutdown receiving x = don? care shutdown mode, driver and receiver outputs high impedance max3082e/max3085e/max3088e
MAX3080E?ax3089e ?5kv esd-protected, fail-safe, high-speed (10mbps), slew-rate-limited rs-485/rs-422 transceivers ______________________________________________________________________________________ 13 max3081e max3084e max3087e top view 1 2 3 4 ro di gnd 8 7 6 5 a b z y v cc dip/so r d rt rt v cc 5 6 7 8 ro di gnd 4 gnd di ro 3 2 a b y z v cc dr r d 1 0.1 figure 2. max3081e/max3084e/max3087e pin configuration and typical full-duplex operating circuit MAX3080E max3083e max3086e dip/so top view rt rt de v cc re gnd v cc re gnd de ro di 9 10 12 11 b a z y 0.1 figure 1. MAX3080E/max3083e/max3086e pin configuration and typical full-duplex operating circuit max3082e max3085e max3088e top view note: pin labels y and z on timing, test, and waveform diagrams. refer to pins a and b when de is high. v cc 0.1 dip/so r d b a 1 2 3 4 8 5 figure 3. max3082e/max3085e/max3088e pin configuration and typical half-duplex operating circuit
MAX3080E?ax3089e detailed description the MAX3080E?ax3089e 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 drivers disabled (see the fail-safe section). the MAX3080E/max3081e/max3082e feature reduced slew-rate drivers that minimize emi and reduce reflec- tions caused by improperly terminated cables, allowing error-free data transmission up to 115kbps (see the reduced emi and reflections section). the max3083e/max3084e/max3085e offer higher driver output slew-rate limits, allowing transmit speeds up to 500kbps. the max3086e/max3087e/max3088e? dri- ver slew rates are not limited, making transmit speeds up to 10mbps possible. the max3089e? slew rate is selectable between 115kbps, 500kbps, and 10mbps by driving a selector pin with a three-state driver. the max3082e/max3085e/max3088e are half-duplex transceivers, while the MAX3080E/max3081e/ max3083e/max3084e/max3086e/max3087e are full- duplex transceivers. the max3089e is selectable between half- and full-duplex communication by driving a selector pin high or low, respectively. all of these parts operate from a single +5v supply. drivers are output short-circuit current limited. thermal shutdown circuitry protects drivers against excessive power dissipation. when activated, the thermal shut- down circuitry places the driver outputs into a high- impedance state. receiver input filtering the receivers of the MAX3080E?ax3085e, and the max3089e when operating in 115kbps 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 20% due to this filtering. fail-safe the MAX3080E 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 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 MAX3080E 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. max3089e programming the max3089e has several programmable operating modes. transmitter rise and fall times are programma- ble between 2500ns, 750ns, and 25ns, resulting in maximum data rates of 115kbps, 500kbps, and 10mbps, respectively. to select the desired data rate, drive srl to one of three possible states by using a three-state driver, by connecting it to v cc or gnd, or by leaving it unconnected. for 115kbps 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 10mbps 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 back- ward from normal orientation. the max3089e has two pins that invert the phase of the driver and the receiver to correct for this problem. for normal operation, drive txp and rxp low, connect them to ground, or leave them unconnected (internal pulldown). to invert the dri- ver 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 max3089e 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, and drive it high for half-duplex operation. in full-duplex mode, the pin configuration of the driver and receiver is the same as that of a MAX3080E (figure 4). 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 MAX3080E?ax3089e family have extra protection against static electricity. maxim? engineers have developed state-of-the-art structures to protect these pins against esd of ?5kv without damage. ?5kv esd-protected, fail-safe, high-speed (10mbps), slew-rate-limited rs-485/rs-422 transceivers 14 ______________________________________________________________________________________
the esd-protected pins are tested with reference to the ground pin in a powered-down condition. they are test- ed to ?5kv using the human body model. 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 14a shows the human body model, and figure 14b 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 inter- est, which is then discharged into the test device through a 1.5k ? resistor. 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. all pins require this protec- MAX3080E?ax3089e ?5kv esd-protected, fail-safe, high-speed (10mbps), slew-rate-limited rs-485/rs-422 transceivers ______________________________________________________________________________________ 15 r r y z v od v oc figure 5. driver dc test load receiver output test point 1k 1k s1 s2 v cc c rl 15pf figure 6. receiver enable/disable timing test load dip/so top view 1 2 3 4 5 6 7 14 13 12 11 10 9 8 v cc rxp txp a b z y ro re de di srl gnd h/f max3089e rd v cc txp a b z y gnd de srl di max3089e h/f re note: switch positions indicated for h/f = gnd rxp figure 4. max3089e pin configuration and functional diagram
MAX3080Eemax3089e 15kv esd-protected, fail-safe, high-speed (10mbps), slew-rate-limited rs-485/rs-422 transceivers 16 ______________________________________________________________________________________ di de 3v y z c l1 c l2 r diff v od2 output under test 500? figure 7. driver timing test circuit figure 8. driver enable and disable timing test load di 5v 0 z y v o 0 -v o v o 1.5v t dplh 1/2 v o 10% t dr 90% 90% t dphl 1 5v 1/2 v o 10% t df v diff = v (y) - v (z) v diff t skew = | t dplh - t dphl | output normally low output normally high 5v 0 y, z v ol y, z 0 1 5v 1 5v v ol +0.5v v oh -0.5v 2 3v 2.3v t dzl(shdn) , t dzl t dlz t dzh(shdn) , t dzh t dhz de figure 9. driver propagation delays figure 10. driver enable and disable times (except max3081e/max3084e/max3087e) v oh v ol a b 1v -1v 1.5v 1.5v output input ro t rplh t rphl output normally low output normally high 5v 0 v cc ro ro 0 1 5v 1 5v v ol + 0 5v v oh - 0.5v 1.5v 1.5v t rzl(shdn) , t rzl t rlz t rzh(shdn) , t rzh t rhz re figure 11. receiver propagation delays figure 12. receiver enable and disable times (except max3081e/max3084e/max3087e)
MAX3080Eemax3089e 15kv esd-protected, fail-safe, high-speed (10mbps), slew-rate-limited rs-485/rs-422 transceivers ______________________________________________________________________________________ 17 b receiver output ate a v id r figure 13. receiver propagation delay test circuit 100khz/div 0hz 1mhz 20db/div max3080/3089 fig-14 figure 15. driver output waveform and fft plot of max3086e/max3087e/max3088e, and max3089e with srl = gnd, transmitting a 20khz signal charge-current limit resistor discharge resistance storage capacitor c s 100pf r c 1m? ? figure 14a. 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 amperes figure 14b. human body current waveform 100khz/div 0hz 1mhz 20db/div max3080/3089 fig-15 figure 16. driver output waveform and fft plot of max3083e/max3084e/max3085e, and max3089e with srl = v cc, transmitting a 20khz signal 100khz/div 0hz 1mhz 20db/div max3080/3089 fig-16 figure 17. driver output waveform and fft plot of MAX3080E/max3081e/max3082e, and max3089e with srl = unconnected, transmitting a 20khz signal
MAX3080Eemax3089e during test and assembly. all pins require this protec- tion, not just rs-485 inputs and outputs. applications information 256 transceivers on the bus the standard rs-485 receiver input impedance is 12k (one-unit load), and the standard driver can drive up to 32 unit loads. the MAX3080E family of transceivers have a 1/8-unit-load receiver input impedance (96k ), allowing up to 256 transceivers to be connected in par- allel on one communication line. any combination of these devices and/or other rs-485 transceivers with a total of 32 unit loads or less can be connected to the line. reduced emi and reflections the MAX3080Eemax3085e, and max3089e with srl = v cc or unconnected, are slew-rate limited, minimizing emi and reducing reflections caused by improperly ter- minated cables. figure 15 shows the driver output waveform and its fourier analysis of a 20khz signal transmitted by a max3086e/max3087e/max3088e, and max3089e with srl = gnd. high-frequency har- monic components with large amplitudes are evident. figure 16 shows the same signal displayed for a max3083e/max3084e/max3085e, and max3089e with srl = v cc ), transmitting under the same conditions. figure 16?s high-frequency harmonic components are much lower in amplitude, compared with figure 15?s, and the potential for emi is significantly reduced. figure 17 shows the same signal displayed for a MAX3080E/ max3081e/max3082e, and max3089e with srl = unconnected, transmitting under the same conditions. figure 17?s high-frequency harmonic components are even lower. in general, a transmitter?s rise time relates directly to the length of an unterminated stub, which can be driven with only minor waveform reflections. the following equation expresses this relationship conservatively: length = t rise / (10 x 1.5ns/ft) where t rise is the transmitter?s rise time. for example, the MAX3080E?s rise time is typically 1320ns, which results in excellent waveforms with a stub length up to 90 feet. a system can work well with longer unterminated stubs, even with severe reflections, if the waveform settles out before the uart samples them. low-power shutdown mode (except max3082e/max3085e/max3088e) low-power shutdown mode is initiated by bringing both re re re switching char- acteristics tables 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 zh(shdn) ) than from driver/receiver-disable mode (t zh , t zl ). ?5kv esd-protected, fail-safe, high-speed (10mbps), slew-rate-limited rs-485/rs-422 transceivers 18 ______________________________________________________________________________________ 120 120 data in data out r d ro re de di a b z y MAX3080E/max3081e/max3083e/ max3084e/max3086e/max3087e/ max3089e (full duplex) note: re and de on MAX3080E/max3083e/max3086e/max3089e only. figure 18. line repeater for MAX3080E/max3081e/max3083e/ max3084e/max3086e/max3087e, and max3089e in full-duplex mode 5s/div v a - v b di ro 1v/div 5v/div 5v/div max3080/3089 fig 18 figure 19. MAX3080E/max3081e/max3082e, and max3089e with srl = unconnected, system differential voltage at 50khz driving 4000ft of cable
driver output protection two mechanisms prevent excessive output current and power dissipation caused by faults or by bus con- tention. the first, a foldback current limit on the output stage, provides immediate protection against short cir- cuits over the whole common-mode voltage range (see typical operating characteristics ). the second, a ther- mal shutdown circuit, forces the driver outputs into a high-impedance state if the die temperature becomes excessive. 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, use the repeater application shown in figure 18. figures 19, 20, and 21 show the system differential volt- age for the parts driving 4000 feet of 26awg twisted- pair wire at 110khz into 120? ______________________________________________________________________________________ 19 2s/div v a - v b di ro 1v/div 5v/div 5v/div max3080/3089 fig 19 figure 20. max3083e/max3084e/max3085e, and max3089e with srl = v cc, system differential voltage at 50khz driving 4000ft of cable 1s/div v a - v b di ro 1v/div 5v/div 5v/div max3080/3089 fig 20 figure 21. max3086e/max3087e/max3088e, and max3089e with srl = gnd, system differential voltage at 200khz driving 4000ft of cable di ro de re a b re re re ro ro ro di di di de de de d d d r r r b b b a a a 120? 120? d r max3082e max3085e max3088e max3089e (half-duplex) figure 22. typical half-duplex rs-485 network
maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circu it patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. 20 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2000 maxim integrated products printed usa is a registered trademark of maxim integrated products. MAX3080E?ax3089e ?5kv esd-protected, fail-safe, high-speed (10mbps), slew-rate-limited rs-485/rs-422 transceivers figure 23. typical full-duplex rs-485 network 120 ? ? ? ? MAX3080E max3081e max3083e max3084e max3086e max3087e max3089e (full-duplex) note: re and de on MAX3080E/max3083e/max3086e/max3089e only. 8 plastic dip -40? to +85? max3085eepa 14 so -40? to +85? max3083eesd 14 plastic dip 0? to +70? max3083ecpd 14 so 0? to +70? max3083e csd 8 plastic dip -40? to +85? max3082eepa 8 so -40? to +85? max3082eesa 8 plastic dip 0? to +70? max3082ecpa 8 so 0? to +70? max3082e csa 8 plastic dip -40? to +85? max3081eepa 8 so -40? to +85? max3081eesa 8 plastic dip 0? to +70? max3081ecpa 8 so 0? to +70? max3081e csa pin-package temp. range part 14 plastic dip -40? to +85? max3083eepd 8 so 0? to +70? max3084e csa 8 plastic dip 0? to +70? max3084ecpa 8 so -40? to +85? max3084eesa 8 plastic dip -40? to +85? max3084eepa 8 so 0? to +70? max3085e csa 8 plastic dip 0? to +70? max3085ecpa 8 so -40? to +85? max3085eesa ordering information (continued) part temp. range pin-package max3086e csd 0? to +70? 14 so max3086ecpd 0? to +70? 14 plastic dip max3086eesd -40? to +85? 14 so max3086eepd -40? to +85? 14 plastic dip max3087e csa 0? to +70? 8 so 8 plastic dip 0? to +70? max3087ecpa max3087eesa -40? to +85? 8 so 8 plastic dip -40? to +85? max3087eepa max3088e csa 0? to +70? 8 so 8 plastic dip 0? to +70? max3088ecpa max3088eesa -40? to +85? 8 so 8 plastic dip -40? to +85? max3088eepa max3089e csd 0? to +70? 14 so 14 plastic dip 0? to +70? max3089ecpd max3089eesd -40? to +85? 14 so 14 plastic dip -40? to +85? max3089eepd

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