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general description the max13410e?ax13415e are half-duplex rs-485-/rs- 422-compatible transceivers optimized for isolated appli- cations. these devices feature an internal low-dropout regulator (ldo), one driver, and one receiver. the inter- nal ldo allows the part to operate from an unregulated power supply of up to 28v. the autodirection feature reduces the number of optical isolators needed in isolat- ed applications. other features include enhanced esd protection, fail-safe circuitry, slew-rate limiting, and full- speed operation. the max13410e?ax13415e internal ldo generates a 5v ?0% power supply that is used to power its internal circuitry. the max13412e?ax13415e bring the 5v to an output v reg that allows the user to power additional external circuitry with up to 20ma to further reduce exter- nal components. the max13410e/max13411e do not have a 5v output and come in industry-compatible pinouts. this allows easy replacement in existing designs. the max13410e?ax13415e feature a 1/8-unit load receiver input impedance, allowing up to 256 trans- ceivers on the bus. all driver outputs are esd protected using the human body model. these devices also include fail-safe circuitry (max13410e/max13411e/ max13414e/max13415e only), guaranteeing a logic- high receiver output when the receiver inputs are open or shorted. the receiver outputs a logic-high when the transmitter on the terminated bus is disabled (high impedance). the max13412e/max13413e feature maxim? propri- etary autodirection control. this architecture eliminates the need for the de and re control signals. in isolated applications, this reduces the cost and size of the sys- tem by reducing the number of optical isolators required. the max13410e/max13412e/max13414e feature reduced slew-rate drivers that minimize emi and reduce reflections caused by improperly terminated cables, allowing error-free transmission up to 500kbps. the max13411e/max13413e/max13415e are not slew-rate limited, allowing transmit speeds up to 16mbps. the max13410e?ax13415e are available in an 8-pin so package with an exposed paddle to improve power dissipation, and operate over the extended -40? to +85? temperature range. features ? wide +6v to +28v input supply range ? +5v output supplies up to 20ma to external circuitry ? internal ldo ? low 65 a (typ) shutdown supply current ? extended esd protection 15kv human body model (max13412e/ max13413e) 14kv human body model (max13410e/ max13411e) ? 1/8-unit load, allowing up to 256 transceivers on the bus ? -40c to +85c operating temperature range ? fail-safe ? slew-rate limited and full-speed versions ? up to 16mbps data rate on full-speed versions applications - max13410e?ax13415e rs-485 transceiver with integrated low-dropout regulator and autodirection control ________________________________________________________________ maxim integrated products 1 19-1058; rev 1; 8/09 for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. ordering information/selector guide note: all devices operate over the -40? to +85? operating temperature range. + denotes a lead(pb)-free/rohs-compliant package. * ep = exposed pad. ordering information/selector guide continued at end of data sheet. part pin-package autodirection data rate (max) 5v ldo output max13410e esa+ 8 so-ep* no 500kbps no max13411e esa+ 8 so-ep* no 16mbps no isolated rs-485 interfaces utility meters industrial equipment telecomm equipment a gnd di 1 2 8 7 v cc b re de ro so top view 3 4 6 5 max13410e max13411e + *ep *exposed pad connected to ground pin configurations pin configurations continued at end of data sheet.
max13410e?ax13415e rs-485 transceiver with integrated low-dropout regulator and autodirection control 2 _______________________________________________________________________________________ absolute maximum ratings 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. (all voltages referenced to gnd.) v cc .........................................................................-0.3v to +30v re , de/ re , de, di, ro, v reg ..................................-0.3v to +6v a, b............................................................................-8v to +13v short-circuit duration (ro, a, b) to gnd ................. continuous continuous power dissipation (t a = +70?) 8-pin so-ep (derate 19.2mw/? above +70?) ........1539mw operating temperature range ...........................-40? to +85? storage temperature range ............................-65? to +150? junction temperature ......................................................+150? ja (note 1)...................................................................52.0?/w jc (note 1).....................................................................6.0?/w lead temperature (soldering, 10s) ................................+300? parameter symbol conditions min typ max units supply voltage v cc (note 3) 6.0 28.0 v v cc = +7.5v, i load = 20ma 4.5 5 5.5 ldo output voltage v reg v cc = +28v, i load = 0ma 4.5 5 5.5 v ldo output current i reg v cc > +7.5v 20 ma ldo dropout voltage v do v cc = +5v, i out = 20ma 0.5 v minimum bypass capacitor on v reg c s guaranteed by design, max13412e?ax13415e 1f re , de = high/no load (max13410e/max13411e) 10 supply current i cc re , de/ re = high, di = low/no load (max13412e?ax13415e) 10 ma shutdown current i shdn de = low, re = high (max13410e/max13411e) 45 ? thermal-shutdown threshold t ts +150 ? thermal-shutdown threshold hysteresis t tsh 15 ? driver r diff = 100 , figure 1 2.0 5.5 r diff = 54 , figure 1 1.5 5.5 differential driver output v od no load 5.5 v change in magnitude of differential output voltage v od r diff = 100 or 54 , figure 1 0.2 v driver common-mode output voltage v oc r diff = 100 or 54 , figure 1 1 3 v change in magnitude of common- mode voltage v oc r diff = 100 or 54 , figure 1 0.2 v input high voltage v ih di, de, re , de/ re 2.0 v input low voltage v il di, de, re , de/ re 0.8 v input current i in di, de, re , de/ re ? ? driver-disable threshold v dt t a = +25? (max13412e/max13413e) 0.6 1.0 v note 1: package thermal resistances were obtained using the method described in jedec specificactions jesd51-7 using a four layer board . for detailed information on package consitencies refer to www.maxim-ic/thermal-tutorial. electrical characteristics (v cc = +6.0v to +28v, t a = t min to t max , unless otherwise noted. typical values are at v cc = +7.5v, c s = 1?, and t a = +25?.) (note 2)
max13410e?ax13415e rs-485 transceiver with integrated low-dropout regulator and autodirection control _______________________________________________________________________________________ 3 parameter symbol conditions min typ max units 0v < v out < +12v +250 driver short-circuit output current i osd -7v < v out < 0v -250 ma (v cc - 1v) < v out < +12v 20 driver short-circuit-foldback output current i osdf -7v < v out < 0v -20 ma receiver v in = +12v 125 input current (a and b) i a, b re , de, de/ re = gnd, v cc = gnd v in = -7v -100 ? -7v < v cm < +12v (max13410e/max13411e) -200 -50 receiver differential threshold voltage v th -7v < v lm < +12v (max13412e/max13413e) -100 100 mv receiver input hysteresis v th v a + v b = 0v 15 mv output high voltage v oh i o = -1ma, v a - v b > v th v reg - 0.6 v output low voltage v ol i o = +1ma, v a - v b < -v th 0.4 v thr ee- s tate o utp ut c ur r ent at recei ver i ozr 0 < v o < v reg 0.01 ? ? receiver-input resistance r in -7v < v cm < +12v 96 k receiver-output short-circuit current i osr 0v < v ro < v reg ? ?5 ma esd protection esd protection (a, b) human body model (max13412e/max13413e) ?5 kv esd protection (a, b) human body model (max13410e/max13411e) ?4 kv esd protection (all other pins) human body model ? kv switching characteristicsCmax13410e (v cc = +6.0v to +28v, t a = t min to t max , unless otherwise noted. typical values are at v cc = +7.5v, c s = 1?, and t a = +25?.) (note 2) parameter symbol conditions min typ max units driver t dplh 150 1000 driver propagation delay t dphl r diff = 54 , c l = 50pf, figures 2a and 3a 150 1000 ns t hl 250 900 driver differential output rise or fall time t lh r diff = 54 , c l = 50pf, figures 2a and 3a 250 900 ns driver differential output skew |t dplh - t dphl | t dskew r diff = 54 , c l = 50pf, figures 2a and 3a 140 ns maximum data rate f max 500 kbps driver enable from shutdown to output high t dzh ( shdn ) s2 closed, figure 4, r l = 500 , c l = 100pf 11 ? driver enable from shutdown to output low t dzl ( shdn ) s2 closed, figure 4, r l = 500 , c l = 100pf 6s electrical characteristics (continued) (v cc = +6.0v to +28v, t a = t min to t max , unless otherwise noted. typical values are at v cc = +7.5v, c s = 1?, and t a = +25?.) (note 2)
max13410e?ax13415e rs-485 transceiver with integrated low-dropout regulator and autodirection control 4 _______________________________________________________________________________________ parameter symbol conditions min typ max units driver enable to output high t dzh s2 closed, figure 4, r l = 500 , c l = 100pf 2500 ns driver enable to output low t dzl s1 closed, figure 4, r l = 500 , c l = 100pf 2500 ns driver disable from output high t dhz s2 closed, figure 4, r l = 500 , c l = 100pf 100 ns driver disable from output low t dlz s1 closed, figure 4, r l = 500 , c l = 100pf 100 ns time to shutdown t shdn 50 340 700 ns receiver t rplh 200 receiver propagation delay t rphl c l = 15pf (at ro), figures 5 and 6 200 ns receiver output skew t rskew c l = 15pf (at ro), figures 5 and 6 30 ns maximum data rate f max 500 kbps receiver enable to output high t rzh s2 closed, figure 7, c l = 15pf 50 ns receiver enable to output low t rzl s1 closed, figure 7, c l = 15pf 50 ns receiver disable time from high t rzh s2 closed, figure 7, c l = 15pf 50 ns receiver disable time from low t rlz s1 closed, figure 7, c l = 15pf 50 ns receiver enable from shutdown to output high t rzh ( shdn ) s2 closed, figure 7, c l = 15pf 14 ? receiver enable from shutdown to output low t rzl ( shdn ) s1 closed, figure 7, c l = 15pf 3.5 ? switching characteristicsCmax13411e (v cc = +6.0v to +28v, t a = t min to t max , unless otherwise noted. typical values are at v cc = +7.5v, c s = 1?, and t a = +25?.) (note 2) parameter symbol conditions min typ max units driver t dplh 50 driver propagation delay t dphl r diff = 54 , c l = 50pf, figures 2a and 3a 50 ns t hl 15 driver differential output rise or fall time t lh r diff = 54 , c l = 50pf, figures 2a and 3a 15 ns driver differential output skew |t dplh - t dphl | t dskew r diff = 54 , c l = 50pf, figures 2a and 3a 8ns maximum data rate f max 16 mbps driver enable from shutdown to output high t dzh ( shdn ) s2 closed, figure 4, r l = 500 , c l = 100pf 11 ? driver enable from shutdown to output low t dzl ( shdn ) s2 closed, figure 4, r l = 500 , c l = 100pf 6s driver enable to output high t dzh s2 closed, figure 4, r l = 500 , c l = 100pf 70 ns switching characteristicsCmax13410e (continued) (v cc = +6.0v to +28v, t a = t min to t max , unless otherwise noted. typical values are at v cc = +7.5v, c s = 1?, and t a = +25?.) (note 2)
max13410e?ax13415e rs-485 transceiver with integrated low-dropout regulator and autodirection control _______________________________________________________________________________________ 5 switching characteristicsCmax13411e (continued) (v cc = +6.0v to +28v, t a = t min to t max , unless otherwise noted. typical values are at v cc = +7.5v, c s = 1?, and t a = +25?.) (note 2) parameter symbol conditions min typ max units driver enable to output low t dzl s1 closed, figure 4, r l = 500 , c l = 100pf 70 ns driver disable from output high t dhz s2 closed, figure 4, r l = 500 , c l = 100pf 50 ns driver disable from output low t dlz s1 closed, figure 4, r l = 500 , c l = 100pf 50 ns receiver t rplh 75 receiver propagation delay t rphl c l = 15pf (at ro), figures 5 and 6 75 ns receiver output skew t rskew c l = 15pf (at ro), figures 5 and 6 8 ns maximum data rate f max 16 mbps receiver enable to output high t rzh s2 closed, figure 7, c l = 15pf 50 ns receiver enable to output low t rzl s1 closed, figure 7, c l = 15pf 50 ns receiver disable time from high t rzh s2 closed, figure 7 , c l = 15pf 50 ns receiver disable time from low t rlz s1 closed, figure 7, c l = 15pf 50 ns receiver enable from shutdown to output high t rzh ( shdn ) s2 closed, figure 7, c l = 15pf 14 ? receiver enable from shutdown to output low t rzl ( shdn ) s1 closed, figure 7, c l = 15pf 3.5 ? switching characteristicsCmax13412e (v cc = +6.0v to +28v, t a = t min to t max , unless otherwise noted. typical values are at v cc = +7.5v, c s = 1?, and t a = +25?.) (note 2) parameter symbol conditions min typ max units driver t dplh 200 1000 driver propagation delay t dphl r l = 110 , c l = 50pf, figures 2b and 3b 200 1000 ns t hl 250 900 driver differential output rise or fall time t lh r l = 110 , c l = 50pf, figures 2b and 3b 250 900 ns maximum data rate f max 500 kbps driver disable delay t ddd r l = 110 , c l = 50pf, figure 3b 2500 ns receiver t rplh 200 receiver propagation delay t rphl c l = 15pf, figures 5 and 6 200 ns receiver output skew t rskew c l = 15pf, figures 5 and 6 30 ns maximum data rate f max 500 kbps receiver enable to output high t rzh s2 closed, figure 7, c l = 15pf 50 ns receiver enable to output low t rzl s1 closed, figure 7, c l = 15pf 50 ns
max13410e?ax13415e rs-485 transceiver with integrated low-dropout regulator and autodirection control 6 _______________________________________________________________________________________ switching characteristicsCmax13412e (continued) (v cc = +6.0v to +28v, t a = t min to t max , unless otherwise noted. typical values are at v cc = +7.5v, c s = 1?, and t a = +25?.) (note 2) parameter symbol conditions min typ max units receiver disable time from low t rlz s1 closed, figure 7, c l = 15pf 50 ns receiver disable time from high t rzh s2 closed, figure 7, c l = 15pf 50 ns receiver enable delay t red r l = 110 , c l = 50pf, figure 3 2500 ns switching characteristicsCmax13413e (v cc = +6.0v to +28v, t a = t min to t max , unless otherwise noted. typical values are at v cc = +7.5v, c s = 1?, and t a = +25?.) (note 2) parameter symbol conditions min typ max units driver t dplh 50 driver propagation delay t dphl r l = 110 , c l = 50pf, figures 2b and 3b 50 ns t hl 15 driver differential output rise or fall time t lh r l = 110 , c l = 50pf, figures 2b and 3b 15 ns maximum data rate f max 16 mbps driver disable delay t ddd r l = 110 , c l = 50pf, figure 3b 70 ns receiver t rplh 80 receiver propagation delay t rphl c l = 15pf, figures 5 and 6 80 ns receiver output skew t rskew c l = 15pf, figures 5 and 6 13 ns maximum data rate f max 16 mbps receiver enable to output high t rzh s2 closed, figure 7, c l = 15pf 50 ns receiver enable to output low t rzl s1 closed, figure 7, c l = 15pf 50 ns receiver disable time from low t rlz s1 closed, figure 7, c l = 15pf 50 ns receiver disable time from high t rzh s2 closed, figure 7, c l = 15pf 50 ns receiver enable delay t red r l = 110 , figure 3, c l = 50pf 70 ns switching characteristicsCmax13414e (v cc = +6.0v to +28v, t a = t min to t max , unless otherwise noted. typical values are at v cc = +7.5v, c s = 1?, and t a = +25?.) (note 2) parameter symbol conditions min typ max units driver t dplh 200 1000 driver propagation delay t dphl r diff = 54 , c l = 50pf, figures 2a and 3a 200 1000 ns t hl 250 900 driver differential output rise or fall time t lh r diff = 54 , c l = 50pf, figures 2a and 3a 250 900 ns driver differential output skew |t dplh - t dphl | t dskew r diff = 54 , c l = 50pf, figures 2a and 3a 140 ns
max13410e?ax13415e rs-485 transceiver with integrated low-dropout regulator and autodirection control _______________________________________________________________________________________ 7 switching characteristicsCmax13414e (continued) (v cc = +6.0v to +28v, t a = t min to t max , unless otherwise noted. typical values are at v cc = +7.5v, c s = 1?, and t a = +25?.) (note 2) parameter symbol conditions min typ max units maximum data rate f max 500 kbps driver enable to output high t dzh s2 closed, figure 4, r l = 500 c l = 100pf 2500 ns driver enable to output low t dzl s1 closed, figure 4, r l = 500 c l = 100pf 2500 ns driver disable from output high t dhz s2 closed, figure 4, r l = 500 , c l = 100pf 100 ns driver disable from output low t dlz s1 closed, figure 4, r l = 500 , c l = 100pf 100 ns receiver t rplh 200 receiver propagation delay t rphl c l = 15pf (at ro), figures 5 and 6 200 ns receiver output skew t rskew c l = 15pf (at ro), figures 5 and 6 30 ns maximum data rate f max 500 kbps receiver enable to output high t rzh s2 closed, figure 7, c l = 15pf 50 ns receiver enable to output low t rzl s1 closed, figure 7, c l = 15pf 50 ns receiver disable time from low t rlz s1 closed, figure 7, c l = 15pf 50 ns receiver disable time from high t rzh s2 closed, figure 7, c l = 15pf 50 ns switching characteristicsCmax13415e (v cc = +6.0v to +28v, t a = t min to t max , unless otherwise noted. typical values are at v cc = +7.5v, c s = 1?, and t a = +25?.) (note 2) parameter symbol conditions min typ max units driver t dplh 50 driver propagation delay t dphl r diff = 54 , c l = 50pf, figures 2a and 3a 50 ns t hl 15 driver differential output rise or fall time t lh r diff = 54 , c l = 50pf, figures 2a and 3a 15 ns driver differential output skew |t dplh - t dphl | t dskew r diff = 54 , c l = 50pf, figures 2a and 3a 8ns maximum data rate f max 16 mbps driver enable to output high t dzh s2 closed, figure 4, r l = 500 , c l = 15pf 70 ns driver enable to output low t dzl s1 closed, figure 4, r l = 500 , c l = 15pf 70 ns driver disable from output high t dhz s2 closed, figure 4, r l = 500 , c l = 15pf 50 ns
max13410e?ax13415e rs-485 transceiver with integrated low-dropout regulator and autodirection control 8 _______________________________________________________________________________________ switching characteristicsCmax13415e (continued) (v cc = +6.0v to +28v, t a = t min to t max , unless otherwise noted. typical values are at v cc = +7.5v, c s = 1?, and t a = +25?.) (note 2) parameter symbol conditions min typ max units driver disable from output low t dlz s1 closed, figure 4, r l = 500 , c l = 15pf 50 ns receiver t rplh 75 receiver propagation delay t rphl c l = 15pf (at ro), figures 5 and 6 75 ns receiver output skew t rskew c l = 15pf (at ro), figures 5 and 6 8 ns maximum data rate f max 16 mbps receiver enable to output high t rzh s2 closed, figure 7, c l = 15pf 50 ns receiver enable to output low t rzl s1 closed, figure 7, c l = 15pf 50 ns receiver disable time from low t rlz s1 closed, figure 7, c l = 15pf 50 ns receiver disable time from high t rzh s2 closed, figure 7, c l = 15pf 50 ns note 2: c s is the compensation capacitor on v reg for the max13412e?ax13415e versions. c s must have an esr value of 20m or less. note 3: parameters are guaranteed for +6.0v v cc +28v. 8.0 6.0 4.0 2.0 0 -40 10 -15 35 60 85 supply current vs. temperature max13410e-15e toc01 temperature ( c) supply current (ma) no load de = high de = low 0 10 5 20 15 30 25 35 02 1345 output current vs. receiver output high voltage max13410e-15e toc02 output high voltage (v) output current (ma) 0 20 10 40 30 50 60 05 output current vs. receiver output low voltage max13410e-15e toc03 output low voltage (v) output current (ma) 2 134 typical operating characteristics (v cc = +7.5v, t a = +25?, unless otherwise noted.)
max13410e?ax13415e rs-485 transceiver with integrated low-dropout regulator and autodirection control _______________________________________________________________________________________ 9 4.0 4.4 4.2 4.8 4.6 5.2 5.0 5.4 receiver output high voltage vs. temperature max13410e-15e toc04 temperature ( c) output high voltage (v) -40 10 -15 35 60 85 i o = +1ma 0 0.1 0.3 0.2 0.4 0.5 receiver output low voltage vs. temperature max13410e-15e toc05 temperature ( c) output low voltage (v) -40 10 -15 35 60 85 i o = -1ma 80 60 40 20 0 02 1 345 differential output current vs. differential output voltage max13410e-15e toc06 output voltage (v) output current (ma) 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 driver differential output voltage vs. temperature max13410e-15e toc07 temperature ( c) differential output voltage (v) -40 10 -15 35 60 85 r diff = 54 0 40 20 80 60 100 120 -7 -5 -4 -3 -6 -2 0 -1 12345 output current vs. transmitter output high voltage max13410e-15e toc08 output high voltage (v) output current (ma) 0 40 20 80 60 100 120 output current vs. transmitter output low voltage max13410e-15e toc09 output low voltage (v) output current (ma) 046 2 8 10 12 0 30 20 10 40 50 60 70 80 90 100 shutdown current vs. temperature max13410e-15e toc10 temperature ( c) shutdown current ( a) -40 10 -15 35 60 85 0 200 100 400 300 600 500 700 driver propagation vs. temperature (max13412e) max13410e-15e toc11 temperature ( c) driver propagation delay (ns) -40 10 -15 35 60 85 r l = 110 t rplh t rphl 0 5 10 15 20 25 30 35 40 driver propagation vs. temperature (max13413e) max13410e-15e toc12 temperature ( c) driver propagation delay (ns) -40 10 -15 35 60 85 r l = 110 t rphl t rplh typical operating characteristics (continued) (v cc = +7.5v, t a = +25?, unless otherwise noted.)
max13410e?ax13415e rs-485 transceiver with integrated low-dropout regulator and autodirection control 10 ______________________________________________________________________________________ 60 45 30 15 0 -40 10 -15 35 60 85 receiver propagation vs.temperature (max13410e/max13412e) max13410e-15e toc13 temperature ( c) receiver propagation delay (ns) t rphl t rplh 60 45 30 15 0 -40 10 -15 35 60 85 receiver propagation vs.temperature (max13411e/max13413e) max13410e-15e toc14 temperature ( c) receiver propagation delay (ns) t rphl t rplh driver propagation (250kbps) (max13412e) max13410e-15e toc15 1 s/div di 2v/div a - b 5v/div driver propagation (16kbps) (max13413e) max13410e-15e toc16 20ns/div di 2v/div a - b 5v/div receiver propagation (16kbps) (max13413e) max13410e-15e toc17 20ns/div a 2v/div b 2v/div ro 2v/div driving a large capacitive load 16nf (19.2kbps) (max13412e) max13410e-15e toc18 10 s/div di 2v/div a - b 2v/div driving a large capacitive load 16nf (1mbps) (max13413e) max13410e-15e toc19 400ns/div di 2v/div a - b 5v/div driving a large capacitive load 16nf (50kbps) (max13413e) max13410e-15e toc20 1 s/div di 2v/div a - b 2v/div typical operating characteristics (continued) (v cc = +7.5v, t a = +25?, unless otherwise noted.)
max13410e?ax13415e rs-485 transceiver with integrated low-dropout regulator and autodirection control ______________________________________________________________________________________ 11 v od c l v oc a b r diff / 2 r diff / 2 figure 1. driver dc test load 1.5v 1.5v 0 di b a t dplh t dphl 1/2 v o 1/2 v o v o 10% 90% 10% 90% 0 v o -v o v diff t dskew = |t dplh - t dphl | v diff = v a - v b t hl t lh 5v f = 1mhz, t lh 3ns, t hl 3ns figure 3a. driver propagation delays test circuits and waveforms a b de di 5v r diff c l v id figure 2a. driver-timing test circuit a b di r l v id r l v reg gnd c l figure 2b. driver-timing test circuit
max13410e?ax13415e rs-485 transceiver with integrated low-dropout regulator and autodirection control 12 ______________________________________________________________________________________ test circuits and waveforms (continued) 1.5v 1.5v 0 di b a t dplh t dphl 1/2 v o 1/2 v o v o t ddd , t red ro (ro pulled low) 10% 90% 10% 90% 0 v o o -v o v diff v diff = v a - v b t hl t lh f = 1mhz, t lh 3ns, t hl 3ns 5v re = v cc figure 3b. driver propagation delays 1.5v 1.5v a, b 0 0 output normally low de output normally high t dzl(shdn) t dzh(shdn) t dlz t dhz 2.3v 2.3v v ol + 0.5v v oh + 0.5v v oh a, b v ol v cc output under test 5v c l s 1 s 2 500 figure 4. driver enable and disable times v id a b r receiver output ate figure 5. receiver-propagation-delay test circuit
max13410e?ax13415e rs-485 transceiver with integrated low-dropout regulator and autodirection control ______________________________________________________________________________________ 13 test circuits and waveforms (continued) 1.5v 1.5v 1v -1v f = 1mhz, t lh 3ns, t hl 3ns t rphl t rskew = | t rphl - t rplh | t rplh v oh v ol ro a b figure 6. receiver propagation delays 1.5v 1.5v ro 0 0 output normally low ro output normally high t rzh(shdn) , t rzh t rhz t rhz 2.3v 2.3v v oh + 0.5v v oh + 0.5v di = 0v re v reg v reg v reg 0 t rzl(shdn) , t rzl 5v c l 15pf s 1 s 2 1k ro figure 7. receiver enable and disable times
max13410e?ax13415e rs-485 transceiver with integrated low-dropout regulator and autodirection control 14 ______________________________________________________________________________________ pin description pin max13410e/ max13411e max13412e/ max13413e max13414e/ max13415e name function 11ro receiver output. when receiver is enabled and v a - v b -50mv, ro is high. if v a - v b -200mv, ro is low. note: ro is referenced to the ldo output (v reg ). 2 re receiver output enable. drive re low to enable ro. drive re high to disable the ro output and put the ro output in a high-impedance state. 3de d r i ver outp ut e nab l e. d r i ve d e l ow to p ut the d r i ver outp ut i n thr ee- state. d r i ve d e hi g h to enab l e the d r i ver . 444di driver input. drive di low to force the noninverting output low and the inverting output high. drive di high to force the noninverting output high and inverting output low. di is an input to the internal state machine that automatically enables and disables the driver (for the max13412e/max13413e). see the function tables and general description for more information. 5 5 5 gnd ground 6 6 6 a noninverting receiver input and noninverting driver output 7 7 7 b inverting receiver input and inverting driver output 888v cc positive supply. bypass v cc with a 0.1? ceramic capacitor to gnd. ?ro receiver output. when receiver is enabled and v a - v b -100mv, ro is high. if v a - v b -100mv, ro is low. note: ro is referenced to the ldo output (v reg ). ? re receiver output enable. drive re low to force the ro output to be enabled. drive re high to let the autodirection circuit control ro. ? 3v reg ldo output. v reg is fixed at +5v. bypass v reg with a low esr (20m or less) and a 1? (min) ceramic capacitor. 2 de/ re receiver and driver output enable. drive de/ re low to enable ro and disable the driver. drive de/ re high to disable ro and enable the driver. ep ep ep ep exposed pad. ep is internally connected to gnd. for enhanced thermal dissipation, connect ep to a copper area as large as possible. do not use ep as a sole ground connection.
max13410e?ax13415e rs-485 transceiver with integrated low-dropout regulator and autodirection control ______________________________________________________________________________________ 15 function tables for the max13410e/max13411e transmitting input output re de di b a x11 0 1 x10 1 0 0 0 x high impedance high impedance 1 0 x high impedance (shutdown) receiving input output re de a - b ro 0x > -50mv 1 0x < -200mv 0 0 x open/short 1 1 1 x high impedance 10 x high impedance (shutdown) x = don? care, shutdown mode, driver, and receiver outputs are in high impedance. function tables for the max13414e/max13415e transmitting input output de/ re di b a 0 x high impedance high impedance 11 0 1 10 1 0 receiving input output de/ re a - b ro 0 > -50mv 1 0 < -200mv 0 0 open/short 1 1 x high impedance x = don? care, shutdown mode, driver, and receiver outputs are in high impedance. function tables for the max13412e/max13413e transmitting inputs outputs di a - b > v dt action a b 0 x turn driver on 0 1 1 false if driver was off, keep it off high impedance high impedance 1 false if driver was on, keep it on 1 0 1 true turn driver off high impedance high impedance x = don? care, shutdown mode, driver, and receiver outputs are in high impedance. receiving inputs output re a - b driver state receiver state ro 0 > -100mv x on 1 0 < -100mv x on 0 1 x on off high impedance 1 > -100mv off on 1 1 < -100mv off on 0
max13410e?ax13415e detailed description the max13410e?ax13415e are half-duplex rs-485/ rs-422-compatible transceivers optimized for isolated applications. these devices feature an internal ldo reg- ulator, one driver, and one receiver. the internal ldo allows the part to operate from an unregulated +6v to +28v power supply. the autodirection feature reduces the number of optical isolators needed in isolated appli- cations. other features include ?5kv esd protection (max13412e/max13413e only), ?4kv ( max13410e/ max13411e only) fail-safe circuitry, slew-rate limiting, and full-speed operation. the max13410e?ax13415e internal ldo generates a 5v ?0% power supply that is used to power its internal circuitry. the max13412e?ax13415e bring the 5v to an output v reg that allows the user to power additional exter- nal circuitry with up to 20ma to further reduce external components. the max13410e/max13411e do not have a 5v output and come in industry-compatible pinouts. this allows easy replacement in existing designs. the max13412e/max13413e feature maxim? propri- etary autodirection control. this architecture eliminates the need for the de and re control signals. in isolated applications, this reduces the cost and size of the sys- tem by reducing the number of optical isolators required. the max13410e/max13412e/max13414e feature reduced slew-rate drivers that minimize emi and reduce reflections caused by improperly terminated cables, allowing error-free transmission up to 500kbps. the max13411e/max13413e/max13415e are not slew-rate limited, allowing transmit speeds up to 16mbps. the max13410e?ax13415e feature a 1/8-unit load receiver input impedance, allowing up to 256 trans- ceivers on the bus. all driver outputs are protected to ?5kv esd using the human body model. these devices also include fail-safe circuitry, max13410e/ max13411e/max13414e/max13415e, guaranteeing a logic-high receiver output when the receiver inputs are open or shorted. the receiver outputs a logic-high when the transmitter on the terminated bus is disabled (high impedance). internal low-dropout regulator the max13410e?ax13415e include an internal low- dropout regulator that allows it to operate from input volt- ages of up to +28v. the internal ldo has a set output voltage of 5v ?0% that is used to power the internal cir- cuitry of the device. the max13412e?ax13415e offer the ldo output at the v reg output. this allows additional external circuitry to be powered without the need for additional external regulators. the v reg output can source up to 20ma. when using these devices with high input voltages and heavily loaded networks, special care must be taken that the power dissipation rating of the package and the maximum die temperature of the device is not exceeded. die temperature of the part can be calculat- ed using the equation: t die = [( jc + ca ) x p diss ] + t ambient , where t die = temperature of the die jc = 6.0?/w = junction-to-case thermal resist- ance ca = case-to-ambient thermal resistance ja = jc + ca = 52.0?/w = junction-to-ambient thermal resistance p diss = (i cc - v cc ) + [(v cc - v reg ) x i reg )] + [(v cc - v od ) x i driver ] = power dissipation of the part t ambient = ambient temperature v cc = voltage on the v cc input i cc = current in to v cc v reg = voltage on the v reg output i reg = current drawn from the v reg output v od = voltage at the driver output (|v a - v b |) i driver = current driven out of the driver. typically, this is the current through the termination resistor. the absolute maximum rating of the die temperature of the max13410e?ax13415e is +150?. to protect the part from overheating, there is an internal thermal shut- down that shuts down the part when the die tempera- ture reaches +150?. to prevent damage to the part, and to prevent the part from entering thermal shutdown, keep the die temperature below +150?, plus some margin. the circuit designer can minimize the die tem- perature by controlling the following parameters: ? cc ? reg ca measuring the v cc current measured current at the v cc pin is a function of the quiescent current of the part, the amount of current that the drivers must supply to the load, and in the case of the max13412e?ax13415e, the load on the v reg output. in most cases, the load that the drivers must supply will be the termination resistor(s). ideally, the ter- mination resistance should match the characteristic impedance of the cable and is usually not a parameter the circuit designer can easily change. in some low- speed, short-cable applications, proper termination rs-485 transceiver with integrated low-dropout regulator and autodirection control 16 ______________________________________________________________________________________
may not be necessary. in these cases, the drive current can be reduced to minimize the die temperature. minimizing the load on the v reg output lowers the power dissipation of the part and ultimately reduces the maximum die temperature. ca ca is the thermal resistance from case to ambient and is independent of the max13410e?ax13415e. ca is primarily a characteristic of the circuit-board design. the largest contributing factor of ca will be the size and weight of the copper connected to the exposed paddle of the max13410e?ax13415e. lower the thermal resistance by using as large a pad as possible. additionally, vias can be used to connect the pad to other ground planes in the circuit board. note that jc is the thermal resistance of the part from junction-to-case temperature and is fixed at 6.0?/w. it is solely based on the die and package characteristics of max13410e?ax13415e rs-485 transceiver with integrated low-dropout regulator and autodirection control ______________________________________________________________________________________ 17 functional diagrams functional diagram for the max13410e/max13411e/max13414e/max13415e a gnd di 1 2 8 7 v cc b re de ro 3 4 6 5 r d + ldo max13410e max13411e a gnd di 1 2 8 7 v cc b de/re v reg ro 3 4 6 5 r d + ldo max13414e max13415e functional diagram for the max13412e/max13413e v cc 8 - + + - state machine d r a b re di ro com v reg re gnd v reg 1 3 2 4 6 7 5 ri di v dt max13412e max13413e v reg ldo v reg de
max13410e?ax13415e the max13410e?ax13415e. the circuit-board designer has no control over this parameter. fail safe the max13410e/max13411e/max13414e/max13415e guarantee a logic-high receiver output when the receiv- er inputs are shorted or open, or when they are con- nected to a terminated transmission line with all drivers disabled. this is done by setting the receiver input threshold between -50mv and -200mv. if the differential receiver input voltage (a - b) is greater than or equal to -50mv, ro is logic-high. if (a - b) is less than or equal to -200mv, ro is logic-low. in the case of a terminated bus with all transmitters disabled, the receiver? differ- ential input voltage is pulled to 0 by the termination. with the receiver thresholds of the max13410e/ max13411e/max13414e/max13415e, the result is a logic-high with a 50mv minimum noise margin. unlike previous fail-safe devices, the -50mv to -200mv thresh- old complies with the ?00mv eia/tia-485 standard. autodirection circuitry the autodirection circuitry in the max13412e/ max13413e is a technique to minimize the number of signals needed to drive the part. this is especially useful in very low cost, isolated systems. in a typical isolated system, an optocoupler is used for each control signal to cross the isolation barrier. these optocouplers add cost, size and consume power. without the autodirection cir- cuitry, three to four optocouplers may be required for each transceiver. with the autodirection circuitry, the number of optocouplers can be reduced to two. typical rs-485 transceivers have four signals on the control side of the part. these are ro (receiver output), re (receiver enable), de (driver enable), and di (driver input). in some cases, de and re may be connected together to reduce the number of control signals to three. in half-duplex systems, the re and de signals determine if the part is transmitting or receiving. when the part is receiving, the transmitter is in a high-imped- ance state. in a fully compliant rs-485 system, all three or four signals are required. however, with careful design and maxim? autodirection feature, the number of control signals can be reduced to just ro and di in an rs-485 compatible system. this feature assumes the di input idles in the high state while the receiver portion of the max13412e/max13413e is active. it also requires an external pullup resistor on a and pulldown resistor on b (see the typical application circuit, figure 10). the fol- lowing is a description of how autodirection works. when di is low, the max13412e/max13413e always drive the bus low. when di transitions from a low to a high, the drivers actively drive the output until (a - b) > v dt . once (a - b) is greater than v dt , the drivers are disabled, letting the pullup/pulldown resistors hold the a and b lines in the correct state. this allows other transmitters on the bus to pull the bus low. pullup and pulldown resistors the pullup and pulldown resistors on the a and b lines are required for proper operation of the max13412e and max13413e, although their exact value is not criti- cal. they function to hold the bus in the high state (a - b > 200mv) when all the transmitters are in a high-imped- ance state due to either a shutdown condition or autodirection. determining the best value to use for these resistors depends on many factors, such as termi- nation resistor values, noise, number of transceivers on the bus, etc. size these resistors so that, under all con- ditions, (a - b) > 200mv for all receivers on the bus. idle state when not transmitting data, the max13412e/ max13413e require the di input to be driven high to remain in the idle state. a conventional rs-485 trans- ceiver has de and re inputs that are used to enable and disable the driver and receiver. however, the max13412e/max13413e do not have a de input, and instead use an internal state machine to enable and disable the drivers. di must be driven high to go to the idle state. enhanced 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 outputs and receiver inputs of the max13410e max13415e have extra protection against static electricity. maxim? engineers have developed state-of-the-art struc- tures to protect these pins against esd of ?5kv (max13412e/max13413e) and ?4kv (max13410e/ max13411e) without damage. the esd structures with- stand high esd in all states: normal operation, shutdown, and powered down. after an esd event, the max13410e max13415e keep working without latchup or damage. esd protection can be tested in various ways. the trans- mitter outputs and receiver inputs of the max13410e max13415e are characterized for protection to the following limits: ?5kv using the human body model ( max13412e/ max13413e) ?4kv using the human body model ( max13410e/ max13411e) rs-485 transceiver with integrated low-dropout regulator and autodirection control 18 ______________________________________________________________________________________
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 8a shows the human body model, and figure 8b shows the current waveform it generates when dis- charged into a low impedance. this model consists of a 100pf capacitor charged to the esd voltage of inter- est, which is then discharged into the test device through a 1.5k resistor. applications information typical applications the max13410e?ax13415e transceivers are designed for half-duplex, bidirectional data communications on multipoint bus transmission lines. 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 max13410e/ max13412e/max13414e are more tolerant of imperfect termination. typical application circuit for the max13410e and max13411e this application circuit shows the max13410e/ max13411e being used in an isolated application (see figure 9). the max13410e/max13411e use the industry- standard pin out but do not have a v reg output for biasing external circuitry. the positive temperature coef- ficient (ptc) and transient voltage suppressor (tvs) clamp circuit on the rs-485 outputs are intended to pro- vide overvoltage fault protection and are optional based on the requirements of the design. typical application circuit for the max13412e and max13413e this application circuit shows the max13412e and max13413e being used in an isolated application where the autodirection feature is implemented to reduce the number of optical isolators to two (see figure 10). the max13412e/max13413e provide a v reg output that can be used to power external circuit- ry up to 20ma. typical application circuit for the max13414e and max13415e this application circuit shows the max13414e/ max13415e being used in an isolated application using an unregulated power supply with three optical isolators (see figure 11). the max13414e/max13415e provide a v reg output that can be used to power external circuitry up to 20ma. 256 transceivers on the bus the rs-485 standard specifies the load each receiver places on the bus in terms of unit loads. an rs-485- compliant transmitter can drive 32 one-unit load receivers when used with a 120 cable that is terminat- ed on both ends over a -7v to +12v common-mode range. the max13410e?ax13415e are specified as 1/8 unit loads. this means a compliant transmitter can drive up to 256 devices of the max13410e?ax13415e. reducing the common mode, and/or changing the char- acteristic impedance of the cable, changes the maxi- mum number of receivers that can be used. refer to the tia/eia-485 specification for further details. proper termination and cabling/ wiring configurations when the data rates for rs-485 are high relative to the cable length it is driving, the system is subject to proper max13410e?ax13415e rs-485 transceiver with integrated low-dropout regulator and autodirection control ______________________________________________________________________________________ 19 charge-current- limit resistor discharge resistance storage capacitor c s 100pf r c 1m r d 1500 high- voltage dc source device under test figure 8a. human body esd test model i p 100% 90% 36.8% t rl time t dl current waveform peak-to-peak ringing (not drawn to scale) i r 10% 0 0 amps figure 8b. human body current waveform
max13410e?ax13415e transmission line design. in most cases, a single, con- trolled-impedance cable or trace should be used and should be properly terminated on both ends with the characteristic impedance of the cable/trace. rs-485 transceivers should be connected to the cable/ traces with minimum-length wires to prevent stubs. star config- urations and improperly terminated cables can cause data loss. refer to the application notes section of the maxim website or to tia/eia publication tsb-89-a for further information. while proper termination is always desirable, in some cases, such as when data rates are very low, it may be desirable and advantageous to not properly terminate the cables. in such cases, it is up to the designer to ensure that the improper termination and resultant reflections (etc.) will not corrupt the data. reduced emi and reflections the max13410e/max13412e/max13414e feature reduced slew-rate drivers that minimize emi and reduce reflections caused by improperly terminated cables, allowing error-free data transmission up to 500kbps. low-power shutdown mode low-power shutdown mode is initiated in the max13410e/max13411e by driving de low and driving re high. in shutdown, the devices draw 65? (typ) of supply current. the devices are guaranteed not to enter shutdown if de is low (while re is high) 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 character- istics table) 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 dri- vers 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 ). line length the telecommunications industry association (tia) pub- lished the document tsb-89-a: application guidelines for tia/eia-485-a , which is a good reference for deter- mining maximum data rate vs. line length. isolated rs-485 interface an isolated rs-485 interface electrically isolates different nodes on the bus to protect the bus from problems due to high common-mode voltages that exceed the rs-485 common-mode voltage range, conductive noise, and rs-485 transceiver with integrated low-dropout regulator and autodirection control 20 ______________________________________________________________________________________ a gnd di 1 2 8 7 v cc b de ro 3 4 6 5 r d + max13410e max13411e ldo re iso_v cc iso_v cc mcu and related circuitry v sys iso_v cc unregulated isolated power supply r t r t 0.1 f n iso_v cc figure 9. typical application circuit for the max13410e/max13411e
ground loops. the typical application circuits show an isolated rs-485 interface using the max13410e max13415e. the transceiver is powered separately from the controlling circuitry. the autodirection feature of the max13412e/max13413e (see the autodirection circuitry section) requires only two optocouplers to electrically isolate the transceiver. an isolated rs-485 interface electrically isolates differ- ent nodes on the bus to protect the bus from problems due to high common-mode voltages that exceed the rs-485 common-mode voltage range. an isolated rs- 485 interface has two additional design challenges not normally associated with rs-485 design. these are 1) isolating the control signals and 2) getting isolated power to the transceiver. optical isolators are the most common way of getting the control signals across the isolation barrier. isolated power is typically done using a transformer in either a push-pull or flyback configuration. the max845 is an example of an inexpensive, unregulated push-pull converter (see figure 12). while in theory, the output of an unregulated push-pull converter is predictable, the output voltage can vary significantly due to the non-ideal characteristics of the transformer, load variations, and temperature drift of the diodes, etc. variances of ?0% or more would not be uncommon. this would require the addition of a linear regulator to get standard rs-485 transceivers to work. since the max13410e max13415e have the linear regulator built in, this exter- nal regulator and its associated cost and size penalties are not necessary. a nominal +7.5v output with a ?0% tolerance would provide a +6v to +9v supply voltage. this is well within the operating range of the max13410e?ax13415e. if the output tolerance is even greater than ?0%, adjust the design of the power sup- ply for a higher output voltage to ensure the minimum input voltage requirements are met. flyback converters are typically regulated. a tl431 type error amplifier and an optical isolator usually close the loop. the max5021 is an example of a small, inexpen- sive, flyback controller (see figure 13). while the prima- ry output of the flyback converter is tightly regulated, secondary outputs will not be. as with the unregulated push-pull converter, the max13410e?ax13415e are ideally suited for use with these secondary outputs. max13410e?ax13415e rs-485 transceiver with integrated low-dropout regulator and autodirection control a gnd di 1 2 8 7 v cc b v reg ro 3 4 6 5 r d + max13412e max13413e ldo re iso_v cc iso_v cc mcu and related circuitry v sys v sys 0.1 f r t r t iso_v cc iso_v cc 1 f c s detect circuit iso_v cc unregulated isolated power supply figure 10. typical application circuit for the max13412e/max13413e ______________________________________________________________________________________ 21
max13410e?ax13415e rs-485 transceiver with integrated low-dropout regulator and autodirection control 22 ______________________________________________________________________________________ a gnd di 1 2 8 7 v cc b v reg ro 3 4 6 5 r d + max13414e max13415e ldo de/re iso_v cc iso_v cc iso_v cc mcu and related circuitry v sys v sys v sys r t r t c s 1 f iso_v cc 0.1 f unregulated isolated power supply figure 11. typical application circuit for the max13414e/max13415e max845 d1 d2 fs gnd1 gnd2 v cc 1 8 46 27 3 v in sd frequency select c2 c1 c3 5v at 150ma output 5v on / off t1 cr2 cr1 figure 12. using the max845 to obtain an isolated power supply max5021/ max5022 v out v supply opto ndrv cs v cc v in gnd figure 13. the max5021 and max5022 provide an isolated power supply with tighter regulation due to feedback using an opto-isolator coupler.
max13410e?ax13415e rs-485 transceiver with integrated low-dropout regulator and autodirection control ______________________________________________________________________________________ 23 ordering information/selector guide (continued) note: all devices operate over the -40? to +85? operating temperature range. + denotes a lead(pb)-free/rohs-compliant package. * ep = exposed pad. ** future product?ontact factory for availability. part pin-package autodirection data rate (max) 5v ldo output max13412e esa+ 8 so-ep* yes 500kbps yes max13413e esa+ 8 so-ep* yes 16mbps yes max13414e esa+** 8 so-ep* no 500kbps yes max13415e esa+** 8 so-ep* no 16mbps yes top view a gnd di 1 2 8 7 v cc b re v reg ro so 3 4 6 5 max13412e max13413e + *ep a gnd di 1 2 8 7 v cc b de/re v reg ro so 3 4 6 5 max13414e max13415e + *ep *exposed pad connected to ground pin configurations (continued) chip information process technology: bicmos package type package code document no. 8 so-ep s8e+14 21-0111 package information for the latest package outline information and land patterns, go to www.maxim-ic.com/packages . note that a ?? ?? or ??in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status.
max13410e?ax13415e rs-485 transceiver with integrated low-dropout regulator and autodirection control 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. 24 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 2009 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. revision history revision number revision date description pages changed 0 11/07 initial release. 1 8/09 replaced figure 9. 20

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