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35kv high-esd profibus rs-485 transceiver max14770e general description the max14770e is a half-duplex, q 35kv high esd- protected, 20mbps transceiver for profibus-dp and rs-485 applications. in addition, it can be used for rs-422/v.11 communications. the max14770e is designed to meet iec 61158-2, tia/eia-422-b, tia/eia- 485-a, v.11, and x.27 standards. the max14770e is available in an 8-pin so and an 8-pin f max? specified over the extended temperature range. it is also available in a tiny tdfn (3mm x 3mm) pack - age and specified over the automotive (-40 n c to +125 n c) temperature range. applications profibus-dp networksindustrial fieldbuses motion controllers rs-485 networks machine encoders benefits and features s integrated protection increases robustness 35kv hbm esd per jedec js-001-2012 12kv contact esd per iec 61000-4-2 15kv air gap esd per iec 61000-4-2 true fail-safe receiver prevents false transitions on receiver input short or open hot swap eliminates false transitions during power-up or hot insertion short-circuit-protected outputs thermal shutdown circuitry prevents excessive power dissipation s low current reduces power consumption 15a shutdown current 2.5ma supply current typical with no load s profibus compliant with minimum 20mbps data rate s allows up to 128 transceivers on the bus s -40c to +125c automotive temperature range in tiny 8-pin (3mm x 3mm) tdfn 19-5017; rev 5; 1/15 ordering information + denotes a lead(pb)-free/rohs-compliant package. t = tape and reel.* ep = exposed pad. the profibus process field bus logo is a registered trademark of profibus and profinet international (pi).max is a registered trademark of maxim integrated products, inc. typical profibus-dp operating circuit appears at end of data sheet. di de ro a d r shutdown b re max14770e part temp range pin-package top mark max14770eesa+t -40 n c to +85 n c 8 so ? max14770egsa+t -40 n c to +105 n c 8 so ? max14770egua+t -40 n c to +105 n c 8 f max ? max14770eata+t -40 n c to +125 n c 8 tdfn-ep* bmg for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim?s website at www.maximintegrated.com. downloaded from: http:/// functional diagram
2 maxim integrated 35kv high-esd profibus rs-485 transceiver max14770e stresses beyond those listed under ?absolute maximum ratings? may cause permanent damage to the device. these are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. (voltages referenced to gnd.)v cc ....................................................................... -0.3v to +6.0v re , ro ....................................................... -0.3v to (v cc + 0.3v) de, di ................................................................... -0.3v to +6.0v a, b ..................................................................... -8.0v to +13.0v short-circuit duration (ro, a, b) to gnd ................. continuous continuous power dissipation (t a = +70 n c) so (derate 7.6mw/ n c above +70 n c) ......................... 606mw tdfn (derate 24.4mw/ n c above +70 n c) ................. 1951mw f max (derate 4.8mw/ n c above +70 n c) .................. 387.8mw operating temperature range max14470eesa ...............................................-40 n c to +85 n c max14470eg_a ............................................. -40 n c to +105 n c max14470eata ............................................. -40 n c to +125 n c storage temperature range ............................ -65 n c to +150 n c junction temperature range ........................... -40 n c to +150 n c lead temperature (soldering, 10s) ................................ +300 n c soldering temperature (reflow) ...................................... +260 n c electrical characteristics (v cc = +5v q 10%, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v, t a = +25 n c.) (note 2) absolute maximum ratings note 1: package thermal resistances were obtained using the method described in jedec specification jesd51-7, using a four-layer board. for detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial . package thermal characteristics (note 1) so junction-to-ambient thermal resistance ( q ja ) ........ 132 c/w junction-to-case thermal resistance ( q jc )...............38 c/w max junction-to-ambient thermal resistance ( q ja ) ..... 206.3 c/w junction-to-case thermal resistance ( q jc )...............42 c/w tdfn junction-to-ambient thermal resistance ( q ja ) .......... 41 c/w junction-to-case thermal resistance ( q jc ).................8 c/w parameter symbol conditions min typ max units power-supply range v cc 4.5 5.5 v supply current i cc de = 1, re = 0 or de = 0, re = 0 or de = 1, re = 1; no load 2.5 4 ma shutdown supply current i sh de = 0, re = 1 15 f a driverdifferential driver output |v od | r l = 54 i , di = v cc or gnd; figure 1 2.1 v differential driver peak-to-peak output v odpp figure 2 (note 3) 4.0 6.8 v change in magnitude of differential output voltage d v od r l = 54 i ; figure 1 (note 4) -0.2 0 +0.2 v driver common-mode output voltage v oc r l = 54 i ; figure 1 1.8 3 v change in common-mode voltage d v oc r l = 54 i ; figure 1 (note 4) -0.2 +0.2 v driver short-circuit output current (note 5) i osd 0v p v out p +12v; output low +250 ma -7v p v out p v cc ; output high -250 downloaded from: http:///
3 maxim integrated 35kv high-esd profibus rs-485 transceiver max14770e electrical characteristics (continued)(v cc = +5v q 10%, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v, t a = +25 n c.) (note 2) parameter symbol conditions min typ max units driver short-circuit foldback output current (note 5) i osdf (v cc - 1v) p v out p +12v; output low -15 ma -7v p v out p +1v; output high +15 logic inputsdriver input high voltage v ih de, di, re 2.0 v driver input low voltage v il de, di, re 0.8 v driver input hysteresis v hys de, di, re 50 mv driver input current i in de, di, re -1 +1 f a input impedance in hot swap r de figure 11 until the first low-to-high transition of de occurs 1 5.6 10 k w r re figure 11 until the first high-to-low transition of re occurs receiverinput current (a, b) i a, i b de = gnd, v cc = v gnd or +5.5v v in = 12v +250 f a v in = -7v -200 differential input capacitance c ab between a and b, de = re = gnd at 6mhz 8 pf receiver differential threshold voltage v th -7v p v cm p 12v -200 -125 -50 mv receiver input hysteresis d v th v cm = 0v 15 mv logic outputoutput high voltage v oh i out = -6ma, v a - v b = v th 4 v output low voltage v ol i out = 6ma, v a - v b = -v th 0.4 v three-state receiver output current i ozr 0v p v out p v cc -1 +1 f a receiver input resistance r in -7v p v cm p 12v 48 k i receiver output short-circuit current i osr 0v p v ro p v cc -110 +110 ma protection specificationsthermal-shutdown threshold v ts +160 n c thermal-shutdown hysteresis v tsh 15 n c esd protection, a and b pins hbm 35 kv iec 61000-4-2 air-gap discharge to gnd 20 iec 61000-4-2 contact discharge to gnd 10 downloaded from: http:///
4 maxim integrated 35kv high-esd profibus rs-485 transceiver max14770e electrical characteristics (continued)(v cc = +5v q 10%, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v, t a = +25 n c.) (note 2) parameter symbol conditions min typ max units esd protection, all other pins hbm 2 kv driver switching characteristicsdriver propagation delay t dplh r l = 54 i , c l = 50pf; figures 3 and 4 15 28 ns t dphl differential driver output skew |t dplh - t dphl | t dskew r l = 54 i , c l = 50pf; figures 3 and 4 1.2 ns driver output transition skew |t t(mlh) |, |t t(mhl) | t tskew r l = 54 i , c l = 50pf; figures 3 and 5 2 ns driver differential output rise or fall time t lh , t hl r l = 54 i , c l = 50pf; figures 3 and 4 7 15 ns maximum data rate 20 mbps driver enable to output high t dzh r l = 500 i , c l = 50pf; figure 6 25 48 ns driver enable to output low t dzl r l = 500 i , c l = 50pf; figure 7 25 48 ns driver disable time from low t dlz r l = 500 i , c l = 50pf; figure 7 20 40 ns driver disable time from high t dhz r l = 500 i , c l = 50pf, figure 6 20 40 ns driver enable skew time |t zl - t zh | r l = 500 i , c l = 50pf; figures 6 and 7 8 ns driver disable skew time |t lz - t hz | r l = 500 i , c l = 50pf; figures 6 and 7 8 ns driver enable high?propagation delay difference t dzh - t dphl 8 20 ns driver enable low?propagation delay difference t dzl - t dphl 10 20 ns driver enable from shutdown to output high t dzl(shdn) r l = 500 i , c l = 50pf; figure 7 (note 6) 46 100 f s driver enable from shutdown to output low t dzh(shdn) r l = 500 i , c l = 50pf; figure 6 (note 6) 46 100 f s time to shutdown t shdn (note 6) 50 800 ns downloaded from: http:///
5 maxim integrated 35kv high-esd profibus rs-485 transceiver max14770e electrical characteristics (continued)(v cc = +5v q 10%, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v, t a = +25 n c.) (note 2) note 2: devices are production tested at t a = +25 n c. specifications over temperature limits are guaranteed by design. note 3: v odpp is the difference in v od , with the di at high and di at low. note 4: d v od and d v oc are the changes in |v od | and |v oc |, respectively, with the di at high and di at low. note 5: the short-circuit output current applies to peak current just prior to foldback current limiting; the short-circuit foldback out - put current applies during current limiting to allow a recovery from bus contention. note 6: shutdown is enabled 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 800ns, the device is guaranteed to have entered shutdown. note 7: capacitive load includes test probe and fixture capacitance. note 8: guaranteed by characterization; not production tested. parameter symbol conditions min typ max units receiver switching characteristicsreceiver propagation delay t rplh c l = 15pf; figures 8 and 9 (note 7) 28 ns t rphl receiver output skew t rskew c l = 15pf; figures 8 and 9 (notes 7, 8) 2 ns maximum data rate 20 mbps receiver enable to output high t rzh s2 closed; r l = 1k i , c l = 15pf; figure 10 30 ns receiver enable to output low t rzl s1 closed; r l = 1k i , c l = 15pf; figure 10 30 ns receiver disable time from low t rlz s1 closed; r l = 1k i , c l = 15pf; figure 10 30 ns receiver disable time from high t rhz s2 closed; r l = 1k i , c l = 15pf; figure 10 30 ns receiver enable from shutdown to output high t rzl(shdn) s1 closed; r l = 1k i , c l = 15pf; figure 10 (notes 6, 7) 100 f s receiver enable from shutdown to output low t rzh(shdn) s2 closed; r l = 1k i , c l = 15pf; figure 10 (notes 6, 7) 100 f s time to shutdown t shdn (note 6) 50 800 ns downloaded from: http:///
6 maxim integrated 35kv high-esd profibus rs-485 transceiver max14770e figure 1. driver dc test load figure 3. driver timing test circuit figure 4. driver propagation delays figure 2. v odpp swing under profibus equivalent load test v od ab v oc r l 2 r l 2 r l c l v id v cc di de ab v cc di de ab v cc 195 i 110 i v od 195 i 1.5v 1.5v 0 di ba 20% 80% 20% 80% 0 v o -v o v diff t dskew = |t dplh - t dphl | v diff = v a - v b v cc f = 1mhz, t lh p 3ns, t hl p 3ns 1/2 v o t dplh t lh t hl t dphl v o 1/2 v o downloaded from: http:///
7 maxim integrated 35kv high-esd profibus rs-485 transceiver max14770e figure 5. driver transition skew figure 6. driver enable and disable times figure 7. driver enable and disable times ab 50% 50% 50% 50% t t(mlh) t t(mhl) 00 0.25v 1.5v t dzh , t dzh(shdn) t dhz de v cc v oh 1.5v out r l = 500 i 50 i out s1 ab d di 0 or v cc generator de c l 50pf r l = 500 i 50 i out 00.25v 1.5v t dzl , t dzl(shdn) t dlz de s1 ab d di 0 or v cc v cc v cc 1.5v v cc out v ol generator de downloaded from: http:///
8 maxim integrated 35kv high-esd profibus rs-485 transceiver max14770e figure 8. receiver propagation delay test circuit figure 9. receiver propagation delays figure 10. receiver enable and disable times v id b a receiveroutput ate r ab v oh v ol ro t rphl t rskew = |t rphl - t rplh | t = 1mhz, t lh p 3ns, t hl p 3ns t rplh -1v 1v 2 v cc 2 v cc generator 50 i r 1k i c l 15pf r -1.5v +1.5v ro s1 v cc s2 s3 v id re re ro re ro re re ro ro 0 t rhz t rlz 0.25v 0.25v 1.5v 1.5v 0 0 2 s1 opens2 closed s3 = +1.5v s1 open s2 closed s3 = +1.5v s1 closeds2 open s3 = -1.5v s1 closed s2 open s3 = -1.5v v oh 0 0v oh v cc v cc v cc 1.5v 1.5v v cc t rzl , t rzl(shdn) v ol 0 v cc v cc v cc v ol t rzh, t rzh (shdn) 2 v cc downloaded from: http:///
9 maxim integrated 35kv high-esd profibus rs-485 transceiver max14770e typical operating characteristics (v cc = +5v, t a = +25 n c, unless otherwise noted.) differential output voltage v od vs. temperature max14770e toc09 temperature (c) driver differential output voltage (v) 110 95 -5 -10 5 5 50 5 0 0 1 4 5 7 0 -40 15 r l 54 ? differential output voltage v od vs. output current max14770e toc08 output current (ma) differential output voltage (v) 60 40 20 0 10 1 20 2 0 40 0 0 80 driver propagation delay vs. temperature max14770e toc07 temperature (c) driver propagation delay (ns) 110 9 0 0 0 10 10 1 0 0 40 1 r l 4 ? c l 0 receiver propagation delay vs. temperature max14770e toc06 temperature (c) receiver propagation delay (ns) 110 0 6 0 0 10 10 1 0 0 40 1 receiver output ro current vs. output high voltage max14770e toc05 output high voltage (v) output current (ma) 4.5 4.0 3.5 3.0 2.5 2.0 1.5 10 20 30 40 50 0 0 1.0 5.0 receiver output ro current vs. output low voltage max14770e toc04 output low voltage (v) output current (ma) 3.5 3.0 2.5 2.0 1.5 1.0 0.5 10 20 30 40 50 60 0 0 4.0 shutdown supply current vs. temperature max14770e toc03 temperature (c) shutdown supply current (a) 110 9 0 0 3 0 10 0 10 1 0 30 0 40 1 supply current vs. data rate max14770e toc02 data rate (kbps) supply current (ma) 15000 10000 5000 5 10 15 20 25 0 5 40 45 50 55 0 0 0 20000 prus eualent lad n lad no-load dc supply current vs. temperature max14770e toc01 temperature (c) no-load supply current (ma) 110 95 80 5 50 5 0 5 -10 -5 05 10 15 0 5 0 -40 15 de cc de nd downloaded from: http:///
10 maxim integrated 35kv high-esd profibus rs-485 transceiver max14770e typical operating characteristics (continued) (v cc = +5v, t a = +25 n c, unless otherwise noted.) driver disable time from high t dhz max14770e toc18 10ns/div de2v/div a 2v/div di = v cc , r l = 500 ? , c l = 50pf driver disable time from low t dlz max14770e toc17 10ns/div de2v/div b 2v/div di = v cc , r l = 500 ? , c l = 50pf driver enable to output low t dzl max14770e toc16 10ns/div de2v/div b 2v/div di = v cc , r l = 500 ? , c l = 50p driver enable to output high t dzh max14770e toc15 10ns/div de2v/div a 2v/div di = v cc , r l = 500 ? , c l = 50pf driver output rise and fall time vs. temperature max14770e toc14 temperature (c) time (ns) 110 95 -25 -10 5 35 50 65 20 80 2 4 6 8 10 12 14 16 0 -40 125 r l 54 ? c l 50 all time rie time driver output transition skew vs. temperature max14770e toc13 temperature (c) driver output transition skew (ns) 110 0 0 3 0 10 1 3 4 0 40 1 r 4 ? c 0 driver differential skew t dskew vs. temperature max14770e toc12 temperature (c) driver output skew (ns) 110 9 0 0 20 10 2 1 2 4 0 40 12 r 4 ? c 0 driver output current vs. output high voltage max14770e toc11 output high voltage (v) output current (ma) 3 1 -1 -3 -5 20 40 0 0 100 120 140 0 -7 5 driver output current vs. output low voltage max14770e toc10 output low voltage (v) output current (ma) 9 6 3 20 40 60 80 100 120 140 0 0 12 downloaded from: http:///
11 maxim integrated 35kv high-esd profibus rs-485 transceiver max14770e pin configurations pin description pin name function 1 ro receiver output. when re is low and (a - b) r -50mv, ro is high; if (a - b) p -200mv, ro is low. 2 re receiver 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. 3 de driver enable. drive de high to enable driver output. the driver outputs are high impedance when de is low. drive re high and de low to enter low-power shutdown mode. 4 di driver input. with de high, a low on di forces the noninverting output, a, low and the inverting out - put, b, high. similarly, a high on di forces the noninverting output, a, high and the inverting output, b, 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. bypass v cc to gnd with a 0.1 f f ceramic capacitor as close as possible to the device. ? ep exposed pad (tdfn only). connect ep to gnd. max14770e + top view agnd 8 7 v cc b so/max 6 5 de di 1 2 ro 3 4 re 1 + 4 3 86 5 v cc max14770e 2 7b agnd di ro de tdfn (3mm 3mm) *connect exposed pad to gnd. *ep re downloaded from: http:///
12 maxim integrated 35kv high-esd profibus rs-485 transceiver max14770e detailed description the max14770e is a half-duplex, q 35kv high esd- protected transceiver for profibus-dp, rs-485, and rs-422 communications. the device features true fail- safe circuitry that guarantees a logic-high receiver output when the receiver inputs are open or shorted, or when they are connected to a terminated transmis - sion line with all drivers disabled (see the true fail-safe section). the max14770e supports data rates up to 20mbps. the max14770e operates from a single +4.5v to +5.5v supply. drivers are output short-circuit current limit - ed. thermal-shutdown circuitry protects drivers against excessive power dissipation. when activated, the ther - mal-shutdown circuitry places the driver outputs into a high-impedance state. the max14770e has a hot- swap input structure that prevents disturbances on the differential signal lines when the max14770e is powered up (see the hot-swap capability section). true fail-safe the max14770e 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 having 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?s differential input voltage is pulled to 0v by the termination. with the receiver thresholds of the max14770e, this results in a logic-high with a 50mv minimum noise margin. the -50mv to -200mv threshold complies with the q 200mv eia/tia-485 standard. hot-swap capability hot-swap inputs when circuit boards are inserted into a hot or powered backplane, disturbances to the enable inputs and differ - ential receiver inputs can lead to data errors. upon initial circuit board insertion, the processor undergoes its pow - er-up sequence. during this period, the processor out - put drivers are high impedance and are unable to drive the de and re inputs of the max14770e to a defined logic level. leakage currents up to 10 f a from the high- impedance output of a controller could cause de and re to drift to an incorrect logic state. additionally, parasitic circuit board capacitance could cause coupling of v cc or gnd to de and re . these factors could improperly enable the driver or receiver. however, the max14770e has hot-swap inputs that avoid these potential problems. 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 inputs. hot-swap input circuitry the max14770e de and re enable inputs feature hot-swap capability. at the input, there are two nmos devices, m1 and m2 (figure 11). when v cc ramps from 0, an internal 15 f s timer turns on m2 and sets the sr latch that also turns on m1. transistors m2, a 1ma cur - rent sink, and m1, a 100 f a current sink, pull de to gnd through a 5.6k i resistor. m2 is designed to pull de to the disabled state against an external parasitic capaci - tance up to 100pf that can drive de high. after 15 f s, the timer deactivates m2 while m1 remains on, holding de low against three-state leakages that can drive de high. m1 remains on until an external source overcomes the required input current. at this time, the sr latch resets and m1 turns off. when m1 turns off, de reverts to a standard, high-impedance cmos input. whenever v cc drops below 1v, the hot-swap input is reset.for re , there is a complementary circuit employing two pmos devices pulling re to v cc . table 1. functional table (transmitting) table 2. functional table (receiving) x = don?t care. x = don?t care. 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 high-z and shutdown receiving inputs output re de a-b ro 0 x r -0.05v 1 0 x p -0.2v 0 0 x open/shorted 1 1 1 x high-z 1 0 x high-z and shutdown downloaded from: http:///
13 maxim integrated 35kv high-esd profibus rs-485 transceiver max14770e thermal-shutdown protection the max14770e features thermal-shutdown circuitry. the internal switch turns off when the junction tempera - ture exceeds +160 n c (typ) and immediately goes into a fault mode. the device exits thermal shutdown after the junction temperature cools by 15 n c (typ). applications information 128 transceivers on the bus the standard rs-485 receiver input impedance is one unit load, and a standard driver can drive up to 32 unit loads. the max14770e transceiver has a 1/4 unit load receiver, which allows up to 128 transceivers connected in parallel on one communication line. connect any com - bination of these devices, and/or other rs-485 devices, for a maximum of 32 unit loads to the line. low-power shutdown mode low-power shutdown mode is initiated by bringing both re high and de low. in shutdown, the devices draw only 15 f a (max) 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 800ns, the devices are guaranteed to enter shutdown. 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 +160 n c (typ). typical application the max14770e transceivers are designed for bidirectional data communications on multipoint bus transmission lines. figure 12 shows a typical network applications circuit. 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. profibus termination the max14770e is designed for driving profibus-dp termination networks. with a worst-case loading of two termination networks with 220 i termination impedance and 390 i pullups/pulldowns, the drivers can drive v( a - b) > 2.1v output. figure 11. simplified structure of the driver enable pin (de) v cc timer de timer 5.6k i 15 f s 100 f a 1ma m2 m1 driverenable (hot swap) downloaded from: http:///
14 maxim integrated 35kv high-esd profibus rs-485 transceiver max14770e extended esd protection esd protection structures are incorporated on all pins to protect against electrostatic discharges up to q 2kv (hbm) encountered during handling and assembly. a and b are further protected against high esd up to q 35kv (hbm) without damage. the a and b pins are also protected against q 20 kv air-gap and q 10kv contact iec61000-4-2 esd events. the esd structures withstand high esd both in normal operation and when the device is powered down. after an esd event, the max14770e continues to function without latchup. 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 13 shows the hbm. figure 14 shows the current waveform it generates when discharged into a low- impedance state. this model consists of a 100pf capaci - tor charged to the esd voltage of interest that is then discharged into the device through a 1.5k i resistor. iec 61000-4-2 the iec 61000-4-2 standard covers esd testing and performance of finished equipment. it does not spe - cifically refer to integrated circuits. the max14770e is specified for q 20 kv air-gap discharge and q 10kv contact discharge iec 61000-4-2 on the a and b pins. the main difference between tests done using the hbm 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 figure 12. typical half-duplex rs-485 network figure 13. human body esd test model figure 14. human body current waveform di r d de ro re di r de ro re d b b 120 i 120 i a a ba di r d dero re di de ro re ba r d max14770e charge-current- limit resistor discharge resistance storagecapacitor c s 100pf r c 1m i r d 1.5k i 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 amperes downloaded from: http:///
15 maxim integrated 35kv high-esd profibus rs-485 transceiver max14770e esd test model (figure 15), the esd-withstand voltage measured to this standard is generally lower than that measured using the hbm. figure 16 shows the current waveform for the q 10 kv iec 61000-4-2 level 4 esd contact discharge test. the air-gap discharge test involves approaching the device with a charged probe. the contact discharge method connects the probe to the device before the probe is energized. chip information process: bicmos figure 15. iec61000-4-2 esd test model figure 16. iec61000-4-2 esd generator current waveform package information for the latest package outline information and land patterns, go to www.maximintegrated.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. charge-current- limit resistor discharge resistance storagecapacitor c s 150pf r c 50m i to 100m i r d 330 i high- voltage dc source device under test 60ns 30ns t r = 0.7ns to 1ns t 10% 90% i peak 100% v cc gnd gnd dide re ro 220 i 390 i 390 i a d r shutdown b max14770e 0.1 f f 0.1 f f v cc di de ro 220 i 390 i 390 i a d r shutdown profibus b line profibus a line b re max14770e package type package code outline no. land pattern no. 8 so s8+4 21-0041 90-0096 8 tdfn-ep t833+2 21-0137 90-0059 8 f max u8+1 21-0036 90-0092 downloaded from: http:/// typical profibus-dp operating circuit
maxim integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim integrated product. no circuit patent licenses are implied. maxim integrated reserves the right to change the circuitry and specifications without notice at any time. the parametric values (min and max limits) shown in the electrical characteristics table are guaranteed. other parametric values quoted in this data sheet are provided for guidance. 16 maxim integrated 160 rio robles, san jose, ca 95134 usa 1-408-601-1000 ? 2015 maxim integrated products, inc. maxim integrated and the maxim integrated logo are trademarks of maxim integrated products, inc. 35kv high-esd profibus rs-485 transceiver max14770e revision history revision number revision date description pages changed 0 10/09 initial release ? 1 4/10 switched the position of the pins de and di (tdfn) in the pin configurations 11 2 1/11 updated logic output specifications, toc 15, and the typical profibus-dp operating circuit, added the ?driver enable high/low?propagation delay difference? parameters and updated various typical values in the electrical characteristics table 3, 4, 10, 15 3 10/12 added f max and new so packaging to data sheet 1, 2, 11, 15 4 2/13 added missing 85 c so information to data sheet 1, 2 5 1/15 updated document title and general description and benefits and features sections 1-16 downloaded from: http:///

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