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_______________________________________________________________ maxim integrated products 1 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxims website at www.maxim-ic.com. +5.0v, 15kv esd-protected, fail-safe, hot-swap, rs-485/rs-422 transceiver 19-6016; rev 0; 10/11 general description the MAX13085E +5.0v, 15kv esd-protected, rs-485/ rs-422 transceiver features one driver and one receiver. the device includes fail-safe circuitry, guaranteeing 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 MAX13085E includes a hot-swap capability to eliminate false transitions on the bus during power-up or hot insertion. the MAX13085E features reduced slew-rate drivers that minimize emi and reduce reflections caused by improperly terminated cables, allowing error-free data transmission up to 500kbps. the MAX13085E is ideal for half-duplex communications and it draws 1.2ma of supply current when unloaded or when fully loaded with the drivers disabled. the MAX13085E has a 1/8-unit load receiver input imped - ance, allowing up to 256 transceivers on the bus. the MAX13085E is available in an 8-pin so and pdip packages. applications utility meters lighting systems industrial control telecom security systems instrumentation profibus features s +5.0v operation s extended esd protection for rs-485/rs-422 i/o pins 15kv human body model s true fail-safe receiver while maintaining eia/tia-485 compatibility s hot-swap input structures on de and re s enhanced slew-rate limiting facilitates error- free data transmission s low-current shutdown mode s allow up to 256 transceivers on the bus s available in industry-standard 8-pin so and pdip packages ordering information + denotes a lead(pb)-free/rohs-compliant package. typical operating circuit rt rt de re a b a b 0.1f typical half-duplex operating circuit + r d ro di v cc gnd 8 7 6 5 1 2 3 4 re de d r di ro MAX13085E part temp range pin-package MAX13085Eesa+ -40 n c to +85 n c 8 so MAX13085E
2 ______________________________________________________________________________________ +5.0v, 15kv esd-protected, fail-safe, hot-swap, rs-485/rs-422 transceiver stresses beyond those listed under absolute 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. (all voltages referenced to gnd.) supply voltage (v cc ) ........................................................... +6v control input voltage ( re , de) ............................... -0.3v to +6v driver input voltage (di) ......................................... -0.3v to +6v driver output voltage (a, b) .................................... -8v to +13v receiver input voltage (a, b) .................................. -8v to +13v receiver output voltage (ro) ................. -0.3v to (v cc + 0.3v) driver output current .................................................... 250ma continuous power dissipation (t a = +70c) so (derate 5.9mw/c above +70c) .......................... 471mw operating temperature range .......................... -40c to +85c junction temperature ..................................................... +150c storage temperature range ............................ -65c to +150c lead temperature (soldering, 10s) ................................ +300c soldering temperature (reflow) ...................................... +260c dc electrical characteristics (v cc = +5.0v 10%, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5.0v and t a = +25 n c.) (note 1) absolute maximum ratings parameter symbol conditions min typ max units driver v cc supply-voltage range v cc 4.5 5.5 v differential driver output v od r l = 100 i (rs-422), figure 1 3 v cc v r l = 54 i (rs-485), figure 1 2 v cc no load v cc change in magnitude of differential output voltage d v od r l = 100 i or 54 i , figure 1 (note 2) 0.2 v driver common-mode output voltage v oc r l = 100 i or 54 i , figure 1 v cc /2 3 v change in magnitude of common-mode voltage d v oc r l = 100 i or 54 i , figure 1 (note 2) 0.2 v input-high voltage v ih de, di, re 3 v input-low voltage v il de, di, re 0.8 v input hysteresis v hys de, di, re 100 mv input current i in1 de, di, re q 1 f a input impedance first transition at power-up r pwup v de , v re = v re = 2v 3.65 8.8 k i input impedance on first transition after por delay r ft v de = v re = 2v 7 60 k ? driver short-circuit output current i osd 0 p v out p +12v (note 3) 40 250 ma -7v p v out p v cc (note 3) -250 -40 driver short-circuit foldback output current i osdf (v cc - 1v) p v out p +12v (note 3) 20 ma -7v p v out p +1v (note 3) -20 thermal-shutdown threshold t ts 175 n c thermal-shutdown hysteresis t tsh 15 n c input current (a and b) i a, b v de = 0v, v cc = 0v or v cc v in = +12v 125 f a v in = -7v -100 receiver receiver differential threshold voltage v th -7v p v cm p +12v -200 -125 -50 mv receiver input hysteresis d v th v a + v b = 0v 15 mv MAX13085E
_______________________________________________________________________________________ 3 +5.0v, 15kv esd-protected, fail-safe, hot-swap, rs-485/rs-422 transceiver dc electrical characteristics (continued) (v cc = +5.0v 10%, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5.0v and t a = +25 n c.) (note 1) driver switching characteristics with internal srl (500kbps) (v cc = +5.0v 10%, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5.0v and t a = +25 n c.) (note 1) parameter symbol conditions min typ max units 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 p v o p v cc p 1 f a receiver input resistance r in -7v p v cm p +12v 96 k i receiver output short-circuit current i osr 0v p v ro p v cc p 110 ma supply current supply current i cc no load, v re = 0v, de = v cc 1.2 1.8 ma no load, re = v cc , de = v cc 1.2 1.8 no load, v re = 0v, v de = 0v 1.2 1.8 supply current in shutdown mode i shdn re = v cc , v de = 0v 2.8 10 f a esd protection esd protection for a and b human body model q 15 kv contact discharge iec 61000-4-2, level 4 q 8 air-gap discharge iec 61000-4-2 q 15 parameter symbol conditions min typ max units driver propagation delay t dplh c l = 50pf, r l = 54 i , figures 2 and 3 200 1000 ns t dphl 200 1000 driver differential output rise or fall time t r , t f c l = 50pf, r l = 54 i , figures 2 and 3 250 900 ns differential driver output skew |t dplh - t dphl | t dskew c l = 50pf, r l = 54 i , figures 2 and 3 140 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 5500 ns driver enable from shutdown to output low t dzl(shdn) figure 5 5500 ns time to shutdown t shdn 50 340 700 ns MAX13085E
4 ______________________________________________________________________________________ +5.0v, 15kv esd-protected, fail-safe, hot-swap, rs-485/rs-422 transceiver 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 output current applies during current limiting to allow a recovery from bus contention. receiver switching characteristics with internal srl (500kbps) (v cc = +5.0v 10%, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5.0v and t a = +25 n c.) (note 1) test circuits and waveforms figure 1. driver dc test load figure 2. driver timing test circuit figure 3. driver propagation delays b a v od v oc r l /2 r l /2 di de v cc a b v od r l c l 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 r 90% 90% 1/2 v o 10% t f v diff = v (b) - v (a) v diff t skew = | t dplh - t dphl | parameter symbol conditions min typ max units receiver propagation delay t rplh c l = 15pf, figures 6 and 7 200 ns t rphl 200 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 5500 ns receiver enable from shutdown to output low t rzl(shdn) figure 8 5500 ns time to shutdown t shdn 50 340 700 ns MAX13085E
_______________________________________________________________________________________ 5 +5.0v, 15kv esd-protected, fail-safe, hot-swap, rs-485/rs-422 transceiver test circuits and waveforms (continued) figure 4. driver enable and disable times (t dhz , t dzh , t dzh(shdn) ) figure 5. driver enable and disable times (t dzl , t dlz, t dlz(shdn) ) de out t dhz 0 v cc v cc /2 0.25v 0 v oh generator 0 or v cc s1 50 d out t dzh , t dzh(shdn) v om = (0 + v oh )/2 r l = 500 c l 50pf de v cc out t dlz 0 v cc v cc /2 generator 0 or v cc 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 MAX13085E
6 ______________________________________________________________________________________ +5.0v, 15kv esd-protected, fail-safe, hot-swap, rs-485/rs-422 transceiver test circuits and waveforms (continued) figure 6. receiver propagation delay test circuit figure 7. receiver propagation delays figure 8. receiver enable and disable times v id r b a receiver output ate a b ro v oh v cc /2 t rplh t rphl v ol +1v -1v the rise time and fall time of inputs a and b < 4ns s1 open s2 closed v s3 = +1.5v ro v cc 0 0 v oh v oh / 2 s1 open s2 closed v s3 = +1.5v t rhz v cc 0 0 v oh 0.25v v cc /2 50% 50% 10% 10% s1 closed s2 open v s3 = -1.5v v cc 0 v ol v cc v cc /2 s1 closed s2 open v s3 = -1.5v t rlz v cc 0 v ol v cc 0.25v generator v cc +1.5v 1k c l 15pf s2 s1 50 s3 -1.5v v id re ro re ro re ro re t rzh , t rzh(shdn) t rzl , t rzl(shdn) (v ol + v cc )/2 v cc /2 MAX13085E
_______________________________________________________________________________________ 7 +5.0v, 15kv esd-protected, fail-safe, hot-swap, rs-485/rs-422 transceiver typical operating characteristics (v cc = +5.0v, t a = +25c, unless otherwise noted.) 0 60 40 20 80 100 120 140 160 180 200 04 26 81 01 2 output current vs. transmitter output-low voltage MAX13085E toc09 output-low voltage (v) output current (ma) 0 40 20 100 80 60 120 140 180 160 200 -7 -5 -4 -6 -3 -2 -1 0 123 5 4 output current vs. transmitter output-high voltage MAX13085E toc08 output high voltage (v) output current (ma) 2.0 2.8 2.4 3.6 3.2 4.4 4.0 4.8 driver differential output voltage vs. temperature MAX13085E toc07 differential output voltage (v) r l = 54 -40 -10 52 0 -25 35 50 95 80 110 65 125 temperature (c) 0 20 40 60 80 100 120 140 160 0 12345 driver differential output current vs. differential output voltage MAX13085E toc06 differential output voltage (v) differential output current (ma) 0 0.1 0.7 0.3 0.2 0.4 0.5 0.6 0.8 receiver output-low voltage vs. temperature MAX13085E toc05 temperature (c) output low voltage (v) i o = 1ma -40 -10 52 0 -25 35 50 95 80 110 65 125 4.0 4.4 4.2 4.8 4.6 5.2 5.0 5.4 receiver output-high voltage vs. temperature MAX13085E toc04 temperature (c) output high voltage (v) i o = -1ma -40 -10 52 0 -25 35 50 95 80 110 65 125 0 20 10 40 30 60 50 70 02 1 345 output current vs. receiver output-low voltage MAX13085E toc03 output low voltage (v) output current (ma) 0 20 10 40 30 50 60 02 13 45 output current vs. receiver output-high voltage MAX13085E toc02 output high voltage (v) output current (ma) 0.80 0.90 1.50 1.10 1.00 1.20 1.30 1.40 1.60 -40 -10 52 0 -25 35 50 95 80 110 65 125 supply current vs. temperature MAX13085E toc01 temperature (c) supply current (ma) no load de = v cc de = 0 MAX13085E
8 ______________________________________________________________________________________ +5.0v, 15kv esd-protected, fail-safe, hot-swap, rs-485/rs-422 transceiver typical operating characteristics (continued) (v cc = +5.0v, t a = +25c, unless otherwise noted.) 400ns/div driver propagation delay (500kbps) di 2v/div max14780e toc14 r l = 100 ? v y - v z 5v/div 200ns/div receiver propagation delay (500kbps) v a - v b 5v/div ro 2v/div MAX13085E toc13 r l = 100 ? 0 40 20 100 80 60 120 140 160 180 receiver propagation delay vs. temperature (500kbps) MAX13085E toc12 receiver propagation delay (ns) -40 -10 52 0 -25 35 50 95 80 110 65 125 temperature (c) t dphl t dplh 300 400 350 500 450 550 600 driver propagation delay vs. temperature (500kbps) MAX13085E toc11 driver propagation delay (ns) t dphl t dplh -40 -10 52 0 -25 35 50 95 80 110 65 125 temperature (c) 0 2 1 5 4 3 6 7 9 8 10 shutdown current vs. temperature MAX13085E toc10 shutdown current (a) -40 -10 52 0 -25 35 50 95 80 110 65 125 temperature (c) MAX13085E
_______________________________________________________________________________________ 9 +5.0v, 15kv esd-protected, fail-safe, hot-swap, rs-485/rs-422 transceiver pin configuration pin description function tables r d ro di v cc b a gnd 8 7 6 5 1 + 2 3 4 so re de pin name function 1 ro receiver output. when re is low and if (a - b) r -50mv, ro is high; if (a - b) p -200mv, ro is low. 2 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). 3 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). 4 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. 5 gnd ground 6 a noninverting receiver input and noninverting driver output 7 b inverting receiver input and inverting driver output 8 v cc positive supply v cc = +5.0v q 10%. bypass v cc to gnd with a 0.1 f f capacitor. transmitting inputs outputs re de di b a x 1 1 0 1 x 1 0 1 0 0 0 x high-z high-z 1 0 x shutdown receiving inputs outputs re de a-b ro 0 x r -50mv 1 0 x p -200mv 0 0 x open/shorted 1 1 1 x high-z 1 0 x shutdown MAX13085E
10 _____________________________________________________________________________________ +5.0v, 15kv esd-protected, fail-safe, hot-swap, rs-485/rs-422 transceiver detailed description the MAX13085E high-speed transceiver for rs-485/ rs-422 communication contains one driver and one receiver. this device features fail-safe circuitry, which guarantees a logic-high receiver output when the receiv - er inputs are open or shorted, or when they are con - nected to a terminated transmission line with all drivers disabled (see the fail-safe section). the MAX13085E also features a hot-swap capability allowing line inser - tion without erroneous data transfer (see the hot-swap capability section). the MAX13085E features reduced slew-rate drivers that minimize emi and reduce reflec - tions caused by improperly terminated cables, allowing error-free data transmission up to 500kbps. the MAX13085E is a half-duplex transceiver and oper - ates from a single +5.0v supply. drivers are output short-circuit current limited. thermal-shutdown circuitry protects drivers against excessive power dissipation. when activated, the thermal-shutdown circuitry places the driver outputs into a high-impedance state. fail-safe the MAX13085E 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 dif - ferential 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 ter - minated bus with all transmitters disabled, the receivers differential input voltage is pulled to 0v by the termina - tion. with the receiver threshold of the MAX13085E, 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 200mv eia/tia- 485 standard. hot-swap capability hot-swap inputs when circuit boards are inserted into a hot or powered backplane, differential disturbances to the data bus can lead to data errors. upon initial circuit board inser - tion, the data communication processor undergoes its own power-up sequence. during this period, the processors logic-output drivers are high impedance and are unable to drive the de and re inputs of these devices to a defined logic level. leakage currents up to 10a from the high-impedance state of the proces - sors logic drivers could cause standard cmos enable inputs of a transceiver to drift to an incorrect logic level. additionally, parasitic circuit board capacitance could cause coupling of v cc or gnd to the enable inputs. without the hot-swap capability, these factors could improperly enable the transceivers 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 7s timer turns on m2 and sets the sr latch, which also turns on m1. transistors m2, a 500a current sink, and m1, a 100a 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 7s, the timer deactivates m2 while m1 remains on, holding de low against three-state leak - ages 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 figure 9. simplified structure of the driver enable pin (de) de de (hot swap) 5k timer timer v cc 10s m2 m1 500a 100a sr latch MAX13085E
______________________________________________________________________________________ 11 +5.0v, 15kv esd-protected, fail-safe, hot-swap, rs-485/rs-422 transceiver 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 . 30kv esd protection as with all maxim devices, esd-protection structures are incorporated on all pins to protect against electrostatic discharges encountered during handling and assembly. the driver output and receiver input of the MAX13085E have extra protection against static electricity. maxims engineers have developed state-of-the-art structures to protect these pins against esd of 15kv without dam - age. the esd structures withstand high esd in all states: normal operation, shutdown, and powered down. after an esd event, the MAX13085E keeps working without latchup or damage. esd protection can be tested in various ways. the trans - mitter output and receiver input of the MAX13085E are characterized for protection to the following limits: ? 15kv using the human body model ? 8kv using the contact discharge method specified in iec 61000-4-2 ? 15kv using the air-gap discharge method specified in iec 61000-4-2 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 61000-4-2 the iec 61000-4-2 standard covers esd testing and performance of finished equipment. however, it does not specifically refer to integrated circuits. the MAX13085E helps you design equipment to meet iec 61000-4-2, with - out the need for additional esd-protection components. the major difference between tests done using the human body model and iec 61000-4-2 is higher peak current in iec 61000-4-2 because series resistance is lower in the iec 61000-4-2 model. hence, the esd withstand voltage measured to iec 61000-4-2 is gen - erally lower than that measured using the human body model. figure 10c shows the iec 61000-4-2 model, and figure 10d shows the current waveform for iec 61000-4-2 esd contact discharge test. machine model the machine model for esd tests all pins using a 200pf storage capacitor and zero discharge resistance. 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. figure 10a. human body esd test model figure 10b. human body current waveform charge-current- limit resistor discharge resistance storage capacitor c s 100pf r c 1m r d 1500 high- voltage dc source device under test 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 MAX13085E
12 _____________________________________________________________________________________ +5.0v, 15kv esd-protected, fail-safe, hot-swap, rs-485/rs-422 transceiver applications information the standard rs-485 receiver input impedance is 12k (1-unit load), and the standard driver can drive up to 32-unit loads. the MAX13085E has a 1/8-unit load receiver input impedance (96k), allowing up to 256 transceivers to be connected in parallel on one commu - nication line. any combination of the MAX13085E, 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 MAX13085E features reduced slew-rate drivers that minimize emi and reduce reflections caused by improp - erly terminated cables, allowing error-free data transmis - sion up to 500kbps. low-power shutdown mode low-power shutdown mode is initiated by bringing both re high and de low. in shutdown, the devices typically draw only 2.8a of supply current. re and de can be driven simultaneously; the devices 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 700ns, the devices are guaranteed to enter shutdown. enable times t zh and t zl (see the switching characteristics section) assume the devices were not in a low-power shutdown state. enable times t zh(shdn) and t zl(shdn) assume the devices were in shutdown state. 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 conten - tion. 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 the typical operating characteristics ). the second, a thermal-shutdown circuit, forces the driver outputs into a high-impedance state if the die temperature exceeds +175c (typ). line length the rs-485/rs-422 standard covers line lengths up to 4000ft. for line lengths greater than 4000ft, it may be necessary to implement a line repeater. figure 10c. iec 61000-4-2 esd test model figure 10d. iec 61000-4-2 esd generator 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 t r = 0.7ns to 1ns 30ns 60ns t 100% 90% 10% i peak i MAX13085E
______________________________________________________________________________________ 13 +5.0v, 15kv esd-protected, fail-safe, hot-swap, rs-485/rs-422 transceiver figure 11. typical half-duplex rs-485 network typical applications the MAX13085E transceiver is designed for bidirectional data communications on multipoint bus transmission lines. figure 11 shows a typical network applications circuit. 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-limited MAX13085E is more tolerant of imperfect termination. chip information process: bicmos package information for the latest package outline information and land patterns (footprints), 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 the package regardless of rohs status. 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 MAX13085E re re re package type package code outline no. land pattern no. 8 so s8+4 21-0041 90-0096 MAX13085E
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. 14 maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ? 2011 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. +5.0v, 15kv esd-protected, fail-safe, hot-swap, rs-485/rs-422 transceiver revision history revision number revision date description pages changed 0 10/11 initial release MAX13085E

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