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general description the max3080?ax3089 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. this means that the receiver output will be a logic high if all transmitters on a terminated bus are disabled (high impedance). the max3080/max3081/max3082 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 max3083/max3084/max3085 offer higher driver out- put slew-rate limits, allowing transmit speeds up to 500kbps. the max3086/max3087/max3088? driver slew rates are not limited, making transmit speeds up to 10mbps possible. the max3089? slew rate is selectable between 115kbps, 500kbps, and 10mbps by driving a selector pin with a single three-state driver. these transceivers typically draw 375? of supply current when unloaded, or when fully loaded with the drivers disabled. all devices have a 1/8-unit-load receiver input imped- ance that allows up to 256 transceivers on the bus. the max3082/max3085/max3088 are intended for half- duplex communications, while the max3080/max3081/ max3083/max3084/max3086/max3087 are intended for full-duplex communications. the max3089 is selec- table between half-duplex and full-duplex operation. it also features independently programmable receiver and transmitter output phase via separate pins. next generation device features ? for fault-tolerant applications: max3430: 80v fault-protected, fail-safe, 1/4- unit load, +3.3v rs-485 transceiver ? for low-voltage applications: max3362: +3.3v, high-speed, rs-485/rs-422 transceiver in a sot23 package ? for multiple transceiver applications: max3030e?ax3033e: 15kv esd-protected, +3.3v, quad, rs-422 transmitters max3040?ax3045: 10kv esd-protected, quad, +5v, rs-485/rs-422 transmitters applications rs-422/rs-485 communications level translators transceivers for emi-sensitive applications industrial-control local area networks max3080?ax3089 fail-safe, high-speed (10mbps), slew-rate-limited rs-485/rs-422 transceivers ________________________________________________________________ maxim integrated products 1 19-1138; rev 3; 12/05 selection table *pin-compatible with 75180, with additional features implemented using pins 1, 6, 8, and 13. ordering information continued at end of data sheet. ordering information part max3080 csd max3080cpd max3080esd -40? to +85? 0? to +70? 0? to +70? temp range pin-package 14 so 14 plastic dip 14 so max3080epd -40? to +85? 14 plastic dip for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. part half/full duplex data rate ( mbps) slew rate limited low- power shutdown receiver/ driver enable quiescent current (?) transceivers on bus pin count industry- standard pinout max3080 full 0.115 yes yes yes 375 256 14 75180 max3081 full 0.115 yes no no 375 256 8 75179 max3082 half 0.115 yes yes yes 375 256 8 75176 max3083 full 0.5 yes yes yes 375 256 14 75180 max3084 full 0.5 yes no no 375 256 8 75179 max3085 half 0.5 yes yes yes 375 256 8 75176 max3086 full 10 no yes yes 375 256 14 75180 max3087 full 10 no no no 375 256 8 75179 max3088 half 10 no yes yes 375 256 8 75176 max3089 selectable selectable selectable yes yes 375 256 14 75180*
max3080?ax3089 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_c_ _ .....................................................0? to +70? max308_e_ _...................................................-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 max3080?ax3085, and max3089 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) full duplex ? 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
max3080?ax3089 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) 0v v ro v cc -7v v cm +12v 0.4v v o 2.4v -7v v cm +12v i o = -4ma, v id = -50mv de = gnd, v re = v cc i o = 4ma, v id = -200mv no load, re = di = gnd or v cc , srl = v cc conditions ? 0.001 10 i shdn supply current in shutdown mode ? i cc supply current ma ? ?5 i osr receiver output short-circuit current k ? 96 r in receiver input resistance ? ? i ozr three-state output current at receiver mv -200 -125 -50 v th receiver differential threshold voltage mv 25 ? v th receiver input hysteresis v v cc -1.5 v oh receiver output high voltage v 0.4 v ol receiver output low voltage units min typ max symbol parameter no load, re = di = gnd or v cc , srl = gnd de = v cc de = v cc 420 800 ? 475 1000 de = gnd de = gnd 430 900 375 600 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. receiver supply current supply current
max3080?ax3089 fail-safe, high-speed (10mbps), slew-rate-limited rs-485/rs-422 transceivers 4 _______________________________________________________________________________________ switching characteristics?ax3080?ax3082, and max3089 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?.) figures 7 and 9, r diff = 54 ? , c l1 = c l2 = 100pf 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 6 and 12, c l = 100pf, s2 closed figures 8 and 10, c l = 15pf, s1 closed figures 8 and 10, c l = 15pf, s2 closed figures 6 and 12, c l = 100pf, s1 closed figures 11 and 13; | v id | 2.0v; rise and fall time of v id 15ns (note 5) figures 6 and 12, c l = 100pf, s2 closed figures 11 and 13; | v id | 2.0v; rise and fall time of v id 15ns figures 8 and 10, c l = 15pf, s2 closed figures 8 and 10, c l = 100pf, s2 closed figures 8 and 10, c l = 100pf, s1 closed figures 6 and 12, c l = 100pf, s1 closed figures 8 and 10, c l = 15pf, s1 closed figures 6 and 12, c l = 100pf, s2 closed conditions ns 3500 t rzl(shdn) receiver enable from shutdown to output low ns 3500 t rzh(shdn) receiver enable from shutdown to output high ns 6000 t dzl(shdn) driver enable from shutdown to output low ns 6000 t dzh(shdn) driver enable from shutdown to output high ns 50 200 600 t shdn time to shutdown ns 20 50 t rhz receiver disable time from high ns 20 50 t rlz receiver disable time from low ns 20 50 t rzh receiver enable to output high ns 667 1320 2500 t dr , t df driver rise or fall time ns -3 ?00 t dskew ns 500 2030 2600 t dplh driver input to output driver output skew | t dplh - t dphl | ns 20 50 t rzl receiver enable to output low ns 330 t rskd | t rplh - t rphl | differential receiver skew ns 127 200 t rplh , t rphl receiver input to output ns 100 t dhz driver disable time from high kbps 115 f max maximum data rate ns 3500 t dzh driver enable to output high ns 3500 t dzl driver enable to output low ns 100 t dlz driver disable time from low units min typ max symbol parameter t dphl 500 2030 2600
max3080?ax3089 fail-safe, high-speed (10mbps), slew-rate-limited rs-485/rs-422 transceivers _______________________________________________________________________________________ 5 switching characteristics?ax3083?ax3085, and max3089 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?.) figures 7 and 9, r diff = 54 ? , c l1 = c l2 = 100pf figures 7 and 9, r diff = 54 ? , c l1 = c l2 = 100pf figures 7 and 9, r diff = 54 ? , c l1 = c l2 = 100pf figures 6 and 12, c l = 100pf, s2 closed figures 8 and 10, c l = 15pf, s1 closed figures 8 and 10, c l = 15pf, s2 closed figures 6 and 12, c l = 100pf, s1 closed figures 11 and 13; | v id | 2.0v; rise and fall time of v id 15ns (note 5) figures 6 and 12, c l = 100pf, s2 closed figures 11 and 13; | v id | 2.0v; rise and fall time of v id 15ns figures 8 and 10, c l = 15pf, s2 closed figures 8 and 10, c l = 100pf, s2 closed figures 8 and 10, c l = 100pf, s1 closed figures 6 and 12, c l = 100pf, s1 closed figures 8 and 10, c l = 15pf, s1 closed figures 6 and 12, c l = 100pf, s2 closed conditions ns 3500 t rzh(shdn) receiver enable from shutdown to output high ns 4500 t dzl(shdn) driver enable from shutdown to output low ns 4500 t dzh(shdn) driver enable from shutdown to output high ns 50 200 600 t shdn time to shutdown ns 20 50 t rhz receiver disable time from high ns 20 50 t rlz receiver disable time from low ns 20 50 t rzh receiver enable to output high ns 200 530 750 t dr, t df driver rise or fall time ns -3 ?00 t dskew ns 250 720 1000 t dplh driver input to output driver output skew | t dplh - t dphl | ns 20 50 t rzl receiver enable to output low ns 330 t rskd | t rplh - t rphl | differential receiver skew ns 127 200 t rplh , t rphl receiver input to output ns 100 t dhz driver disable time from high kbps 500 f max maximum data rate ns 2500 t dzh driver enable to output high ns 2500 t dzl driver enable to output low ns 100 t dlz driver disable time from low units min typ max symbol parameter t dphl figures 6 and 12, c l = 100pf, s1 closed ns 3500 t rzl(shdn) receiver enable from shutdown to output low 250 720 1000
max3080?ax3089 fail-safe, high-speed (10mbps), slew-rate-limited rs-485/rs-422 transceivers 6 _______________________________________________________________________________________ switching characteristics?ax3086?ax3088, and max3089 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?.) t dphl figures 6 and 12, c l = 100pf, s1 closed ns figures 7 and 9, r diff = 54 ? , c l1 = c l2 = 100pf 3500 t rzl(shdn) figures 7 and 9, r diff = 54 ? , c l1 = c l2 = 100pf receiver enable from shutdown to output low figures 7 and 9, r diff = 54 ? , c l1 = c l2 = 100pf figures 6 and 12, c l = 100pf, s2 closed figures 8 and 10, c l = 15pf, s1 closed figures 8 and 10, c l = 15pf, s2 closed figures 6 and 12, c l = 100pf, s1 closed figures 11 and 13; | v id | 2.0v; rise and fall time of v id 15ns (note 5) figures 6 and 12, c l = 100pf, s2 closed figures 11 and 13; | v id | 2.0v; rise and fall time of v id 15ns figures 8 and 10, c l = 15pf, s2 closed figures 8 and 10, c l = 100pf, s2 closed figures 8 and 10, c l = 100pf, s1 closed figures 6 and 12, c l = 100pf, s1 closed figures 8 and 10, c l = 15pf, s1 closed figures 6 and 12, c l = 100pf, s2 closed conditions 34 60 ns 3500 t rzh(shdn) receiver enable from shutdown to output high ns 250 t dzl(shdn) driver enable from shutdown to output low ns 250 t dzh(shdn) driver enable from shutdown to output high ns 50 200 600 t shdn time to shutdown ns 20 50 t rhz receiver disable time from high ns 20 50 t rlz receiver disable time from low ns 20 50 t rzh receiver enable to output high ns 14 25 t dr, t df driver rise or fall time ns -2.5 ?0 t dskew ns 34 60 t dplh driver input to output driver output skew | t dplh - t dphl | ns 20 50 t rzl receiver enable to output low ns 010 t rskd | t rplh - t rphl | differential receiver skew ns 106 150 t rplh , t rphl receiver input to output ns 100 t dhz driver disable time from high mbps 10 f max maximum data rate ns 150 t dzh driver enable to output high ns 150 t dzl driver enable to output low ns 100 t dlz driver disable time from low units min typ max symbol parameter 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.
max3080?ax3089 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 (?) no-load supply current ( a) 40 450 425 375 400 060 500 475 -40 -20 20 80 a: max3086?ax3088, max3089 with srl = gnd b: max3080?ax3085, max3089 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 (?) shutdown current (na) 40 12 14 10 8 060 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 (?) 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 (?) 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 (?) 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 (?) 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 (ms) 40 2.10 2.00 2.05 060 2.15 -40 -20 20 80 r t = 54 ? t ypical operating characteristics (v cc = +5v, t a = +25?, unless otherwise noted.)
max3080?ax3089 fail-safe, high-speed (10mbps), slew-rate-limited rs-485/rs-422 transceivers 8 _______________________________________________________________________________________ t ypical operating characteristics (continued) (v cc = +5v, t a = +25?, unless otherwise noted.) 520 560 -60 100 driver propagation delay (500kbps mode) vs. temperature 600 640 920 max3080/3089 toc-10 temperature (?) 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 (?) 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 (?) 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) 6 4 2 -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
max3080?ax3089 fail-safe, high-speed (10mbps), slew-rate-limited rs-485/rs-422 transceivers _______________________________________________________________________________________ 9 2 s/div driver propagation delay max3080/max3081/max3082, and max3089 with srl = open di v y - v z 5v/div 2.5v/div max3080/3089 typ-20 500ns/div driver propagation delay max3083/max3084/max3085, and max3089 with srl = v cc di v y - v z 5v/div 2.5v/div max3080/3089 typ-21 50ns/div driver propagation delay max3086/max3087/max3088, and max3089 with srl = gnd di v y - v z 5v/div 2.5v/div max3080/3089 typ-22 t ypical 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 max3086?ax3088, and max3089 with srl = gnd 50ns/div v a - v b ro 2v/div 5v/div max3080/3089 typ-17 receiver propagation delay max3080?ax3085, and max3089 with srl = open or v cc
max3080?ax3089 fail-safe, high-speed (10mbps), slew-rate-limited rs-485/rs-422 transceivers 10 ______________________________________________________________________________________ pin description pin 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 noninverting 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 outputs. 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 half- duplex mode 1 max3089 2 3 full- duplex mode 1 2 full-duplex devices max3081 max3084 max3087 1 2 half- duplex devices max3082 max3085 max3088 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 max3080 max3083 max3086 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 pin
max3080?ax3089 fail-safe, high-speed (10mbps), slew-rate-limited rs-485/rs-422 transceivers ______________________________________________________________________________________ 11 pin description (continued) 12 8 12 a noninverting receiver input 12 a half- duplex mode max3089 full- duplex mode full-duplex devices max3081 max3084 max3087 half- duplex devices max3082 max3085 max3088 function name max3080 max3083 max3086 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 the receiver phase/polarity. 14 1 8 14 14 v cc positive supply; 4.75v v cc 5.25v 1, 8, 13 n.c. not connected. not internally connected. 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 pin x = don? care shutdown mode, driver and receiver outputs high impedance * (max3089 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. max3081/max3084/max3087 max3080/max3083/max3086
max3080?ax3089 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 max3089 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 max3082/max3085/max3088
max3080?ax3089 fail-safe, high-speed (10mbps), slew-rate-limited rs-485/rs-422 transceivers ______________________________________________________________________________________ 13 max3081 max3084 max3087 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 f figure 2. max3081/max3084/max3087 pin configuration and typical full-duplex operating circuit max3080 max3083 max3086 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 f 5 ro nc di 2 1, 8, 13 3 6, 7 14 4 1 2 3 4 5 6 7 14 13 12 11 10 9 8 v cc n.c. n.c. a b z y n.c. ro re de di gnd gnd r d d rd r figure 1. max3080/max3083/max3086 pin configuration and typical full-duplex operating circuit max3082 max3085 max3088 top view note: pin labels y and z on timing, test, and waveform diagrams refer to pins a and b when de is high. 1 2 3 4 8 5 v cc 0.1 f gnd di de re ro r d rt rt 7 6 d r de re di ro a b 1 2 3 4 8 7 6 5 v cc b a gnd di de re ro dip/so r d b a figure 3. max3082/max3085/max3088 pin configuration and typical half-duplex operating circuit top view top view top view
max3080?ax3089 detailed description the max3080?ax3089 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 fail-safe section). the max3080/ max3081/max3082 feature reduced slew-rate drivers that minimize emi and reduce reflections caused by improperly terminated cables, allowing error-free data transmission up to 115kbps (see reduced emi and reflections section). the max3083/max3084/max3085 offer higher driver output slew-rate limits, allowing transmit speeds up to 500kbps. the max3086/ max3087/max3088? driver slew rates are not limited, making transmit speeds up to 10mbps possible. the max3089? slew rate is selectable between 115kbps, 500kbps, and 10mbps by driving a selector pin with a three-state driver. the max3082/max3085/max3088 are half-duplex transceivers, while the max3080/max3081/max3083/ max3084/max3086/max3087 are full-duplex trans- ceivers. the max3089 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 max3080?ax3085, and the max3089 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, high-speed (10mbps), slew-rate-limited rs-485/rs-422 transceivers 14 ______________________________________________________________________________________ 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 max3089 rd v cc txp a b z y gnd de srl di max3089 h/f re note: switch positions indicated for h/f = gnd figure 4. max3089 pin configuration and functional diagram
fail-safe the max3080 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 max3080 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. max3089 programming the max3089 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 max3089 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 max3089 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 opera- tion, 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 max3080 (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. 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 max3080 family of transceivers have a 1/8-unit-load receiver input impedance (96k ? ), allow- ing up to 256 transceivers to be connected in parallel 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 max3080?ax3085, and max3089 with srl = v cc or unconnected, are slew-rate limited, minimizing emi and reducing reflections caused by improperly termi- nated cables. figure 14 shows the driver output wave- form and its fourier analysis of a 20khz signal transmitted by a max3086/max3087/max3088, and max3089 with srl = gnd. high-frequency harmonic max3080?ax3089 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
max3080?ax3089 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 id output under test 500 ? s1 s2 v cc c l figure 7. driver timing test circuit figure 8. driver enable/disable timing test load di 3v 0v z y v o 0v -v o v o 1.5v t plh 1/2 v o 10% t r 90% 90% t phl 1.5v 1/2 v o 10% t f v diff = v (y) - v (z) v diff t skew = | t plh - t phl | output normally low output normally high 3v 0v y, z v ol y, z 0v 1.5v 1.5v v ol +0.5v v oh -0.5v 2.3v 2.3v t zl(shdn) , t zl t lz t zh(shdn) , t zh t hz de figure 9. driver propagation delays figure 10. driver enable and disable times (except max3081/max3084/max3087) v oh v ol a b 1v -1v 1.5v 1.5v output input ro t plh t phl output normally low output normally high 3v 0v v cc ro ro 0v 1.5v 1.5v v ol + 0.5v v oh - 0.5v 1.5v 1.5v t zl(shdn) , t zl t lz t zh(shdn) , t zh t hz re figure 11. receiver propagation delays figure 12. receiver enable and disable times (except max3081/max3084/max3087)
components with large amplitudes are evident. figure 15 shows the same signal displayed for a max3083/ max3084/max3085, and max3089 with srl = v cc ), transmitting under the same conditions. figure 15? high-frequency harmonic components are much lower in amplitude, compared with figure 14?, and the poten- tial for emi is significantly reduced. figure 16 shows the same signal displayed for a max3080/ max3081/max3082, and max3089 with srl = uncon- nected, transmitting under the same conditions. figure 16? high-frequency harmonic components are even lower. in general, a transmitter? 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? rise time. for example, the max3080? 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. max3080?ax3089 fail-safe, high-speed (10mbps), slew-rate-limited rs-485/rs-422 transceivers ______________________________________________________________________________________ 17 r 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 14. driver output waveform and fft plot of max3086/max3087/max3088, and max3089 with srl = gnd, transmitting a 20khz signal 100khz/div 0hz 1mhz b a 20db/div max3080/3089 fig-15 figure 15. driver output waveform and fft plot of max3083/max3084/max3085, and max3089 with srl = v cc, transmitting a 20khz signal 100khz/div 0hz 1mhz b a 20db/div max3080/3089 fig-16 figure 16. driver output waveform and fft plot of max3080/max3081/max3082, and max3089 with srl = unconnected, transmitting a 20khz signal
max3080?ax3089 low-power shutdown mode (except max3082/max3085/max3088) low-power shutdown mode is initiated by bringing both re high and de low. in shutdown, the devices typically draw only 1na of supply current. re and de may 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 in the 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 ). 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 17. figures 18, 19, and 20 show the system differential volt- age for the parts driving 4000 feet of 26awg twisted- pair wire at 110khz into 120 ? loads. typical applications the max3082/max3085/max3088/max3089 trans- ceivers are designed for bidirectional data communica- tions on multipoint bus transmission lines. figures 21 and 22 show typical network applications circuits. these parts can also be used as line repeaters, with cable lengths longer than 4000 feet, as shown in figure 17. to minimize reflections, the line should be terminated at both ends in its characteristic impedance, and stub lengths off the main line should be kept as short as possible. the slew-rate-limited max3082/max3085, and the two modes of the max3089, are more tolerant of imperfect termination. 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 max3080/max3081/max3083/ max3084/max3086/max3087/ max3089 (full duplex) note: re and de on max3080/max3083/max3086/max3089 only. figure 17. line repeater for max3080/max3081/max3083/ max3084/max3086/max3087, and max3089 in full-duplex mode 5 s/div v a - v b di ro 1v/div 5v/div 5v/div max3080/3089 fig-18 figure 18. max3080/max3081/max3082, and max3089 with srl = unconnected, system differential voltage at 50khz driving 4000 feet of cable
max3080?ax3089 fail-safe, high-speed (10mbps), slew-rate-limited rs-485/rs-422 transceivers ______________________________________________________________________________________ 19 2 s/div v a - v b di ro 1v/div 5v/div 5v/div max3080/3089 fig-19 figure 19. max3083/max3084/max3085, and max3089 with srl = v cc, system differential voltage at 50khz driving 4000 feet of cable 1 s/div v a - v b di ro 1v/div 5v/div 5v/div max3080/3089 fig-20 figure 20. max3086/max3087/max3088, and max3089 with srl = gnd, system differential voltage at 200khz driving 4000 feet of cable di ro de re a b/z* re re re ro ro ro di di di de de de d d d r r r b b b a a a/y* 120 ? 120 ? d r max3082 max3085 max3088 *max3089 (half-duplex) figure 21. 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 2007 maxim integrated products is a registered trademark of maxim integrated products, inc. max3080?ax3089 fail-safe, high-speed (10mbps), slew-rate-limited rs-485/rs-422 transceivers figure 22. typical full-duplex rs-485 network 120 ? 120 ? r d ro re de di a b y 120 ? 120 ? di di di ro ro ro de de de re re re z z z z y y y aa a bb b d d d r r r max3080 max3081 max3083 max3084 max3086 max3087 max3089 (full-duplex) note: re and de on max3080/max3083/max3086/max3089 only. 8 plastic dip -40? to +85? max3085epa 14 so -40? to +85? max3083esd 14 plastic dip 0? to +70? max3083cpd 14 so 0? to +70? max3083 csd 8 plastic dip -40? to +85? max3082epa 8 so -40? to +85? max3082esa 8 plastic dip 0? to +70? max3082cpa 8 so 0? to +70? max3082 csa 8 plastic dip -40? to +85? max3081epa 8 so -40? to +85? max3081esa 8 plastic dip 0? to +70? max3081cpa 8 so 0? to +70? max3081 csa pin-package temp range part 14 plastic dip -40? to +85? max3083epd 8 so 0? to +70? max3084 csa 8 plastic dip 0? to +70? max3084cpa 8 so -40? to +85? max3084esa 8 plastic dip -40? to +85? max3084epa 8 so 0? to +70? max3085 csa 8 plastic dip 0? to +70? max3085cpa 8 so -40? to +85? max3085esa ordering information (continued) 14 so 0? to +70? max3086 csd 14 plastic dip -40? to +85? max3089epd 14 so -40? to +85? max3089esd 14 plastic dip 0? to +70? max3089cpd 14 so 0? to +70? max3089 csd 8 plastic dip -40? to +85? max3088epa 8 so -40? to +85? max3088esa 8 plastic dip 0? to +70? max3088cpa 8 so 0? to +70? max3088 csa 8 plastic dip -40? to +85? max3087epa 8 so -40? to +85? max3087esa 8 plastic dip 0? to +70? max3087cpa 8 so 0? to +70? max3087 csa 14 plastic dip -40? to +85? max3086epd 14 so -40? to +85? max3086esd 14 plastic dip 0? to +70? max3086cpd pin-package temp range part p ack ag e information for the latest package outline information, go to www.maxim-ic.com/packages .

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