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general description the max14784e/max14786e/max14787e/max14789e full-duplex rs-485 transceivers are designed for robust communication in harsh industrial environments. all devices feature 35kv esd protection on the rs-485 pins and operate from a 3v to 5.5v supply with a 4ma no-load supply current (max). the max14784e/max14787e are optimized for communi - cation over very long cables or short unterminated cables. the max14784e/max14786e are available in a 14-pin so package and operate over the -40c to +125c tem - perature range. the max14786e is also available in a 14-pin tssop package. the max14787e/max14789e are optimized for space- constrained applications and are available in an 8-pin so package, operating over the -40c to +105c temperature range. applications motion controllers encoder interfaces hvac control systems utility meters beneits and features flexibility ? use in full-duplex or half-duplex applications ? wide 3.0v to 5.5v supply voltage range ? available with 500kbps and 25mbps speed options ? available in 8-pin and 14-pin so and tssop packages optimized for performance in harsh industrial environments ? 35kv esd (hbm) protection on rs-485 i/o ports ? extended operating temperature range ? slew-rate limited outputs (max14784e/ max14787e) ? integrated receiver deglitch filter increases noise immunity (max14784e/max14787e/) ? short-circuit protected outputs ? true fail-safe receiver ? thermal shutdown 1/4-unit load allows up to 128 transceivers on the bus 19-6863; rev 2; 1/15 ordering information appears at end of data sheet. shutdown v cc ro re de di y z b a max14784e max14786e v cc ro di y z b a max14787e max14789e de re d d r r functional diagram max14784e/max14786e/max14787e/max14789e full-duplex, 35kv esd-protected, rs-485 transceivers for high-speed communication downloaded from: http:///
(all voltages referenced to gnd.) v cc ..................................................................... -0.3v to +6.0v re , ro ..................................................... -0.3v to (v cc + 0.3)v de, di ................................................................... -0.3v to +6.0v a, b, y, z ........................................................... -8.0v to +13.0v short-circuit duration ................................................ continuous continuous power dissipation (t a = +70c) 8 so (derate 7.6mw/ c above +70 c) ....................... 606mw 14 so (derate 11.9mw/ c above +70 c) ................... 952mw tssop (derate 10mw/ c above +70 c) .................... 796mw operating temperature range 8 so ............................................................. -40 c to +105 c 14 so ........................................................... -40 c to +125 c tssop .......................................................... -40 c to +125 c junction temperature ...................................................... +150c storage temperature range ............................ -65 c to +150 c lead temperature (soldering, 10s) ................................. +300c soldering temperature (reflow) ....................................... +260c junction-to-case thermal resistance ( jc ) 8 so ............................................................................ 38c/w 14 so .......................................................................... 34c/w tssop ......................................................................... 30c/w junction-to-ambient thermal resistance ( ja ) 8 so .......................................................................... 132c/w 14 so .......................................................................... 84c/w tssop ......................................................................... 30c/w (note 1) electrical characteristics (v cc = 3.0v to 5.5v, t a = t min to t max , unless otherwise noted. typical values are at v cc = 5v, and t a = +25 c.) (notes 2, 3) parameter symbol conditions min typ max units power supply supply voltage v cc 3.0 5.5 v supply current i cc de = high, re = low, no load 1.9 4 ma shutdown supply current i shdn de = low, re = high 5 10 a driver differential driver output v od r l = 54, v cc = 4.5v, figure 1 2.1 v r l = 100, v cc = 3.0v, figure 1 2.0 r l = 54, v cc = 3.0v, figure 1 1.5 change in magnitude of differ- ential driver output voltage v od r l = 100 or 54, figure 1 (note 4) 0.2 v driver common-mode output voltage v oc r l = 100 or 54, figure 1 (note 4) v cc /2 3 v change in magnitude of driver common-mode output voltage v oc r l = 100 or 54, figure 1 (note 4) 0.2 v single-ended driver output voltage high v oh y and z outputs, i y, z = -20ma 2.2 v single-ended driver output votlage low v ol y and z outputs, i y, z = +20ma 0.8 v differential driver output ca- pacitance c od de = re = high, f = 4mhz 12 pf max14784e/max14786e/max14787e/max14789e full-duplex, 35kv esd-protected, rs-485 transceivers for high-speed communication www.maximintegrated.com maxim integrated 2 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 . absolute maximum ratings 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. package thermal characteristics downloaded from: http:///
electrical characteristics (continued) (v cc = 3.0v to 5.5v, t a = t min to t max , unless otherwise noted. typical values are at v cc = 5v, and t a = +25 c.) (notes 2, 3) parameter symbol conditions min typ max units peak driver short-circuit output current i osd 0v v out +12v, output low +40 +250 ma -7v v out v cc , output high -250 -40 receiver input current (a and b) i a,b de = low, v cc = 0v or 3.6v v in = +12v +250 a v in = -7v -200 differential input capacitance c a,b measured between a and b, de = low, f = 2mhz 12 pf receiver differential threshold voltage v th -7v v out +12v -200 -120 -10 mv receiver input hysteresis v th v cm = 0v 20 mv receiver input resistance r in -7v v cm +12v 48 k logic interface (di, de, re , ro) input high voltage v ih de, di, re 2.0 v input low voltage v il de, di, re 0.8 v input current i in di -2 +2 a re pulldown and de pullup input resistance r in 1 m receiver output high voltage v oh re = low, i out = -1ma, (v a - v b ) > 200mv v cc - 1.5 v receiver output low voltage v ol re = low, i out = +1ma, (v a - v b ) < -200mv 0.4 v receiver output three-state current i ozr re = high, 0v v ro v cc -1 +1 a receiver output short-circuit current i osr re = low, 0v v ro v cc -95 +95 ma protection thermal shutdown threshold t shdn temperature rising +160 c thermal shutdown hysteresis t shdn 10 c esd protection (a, b, y and z pins) iec 61000-4-2 air gap discharge to gnd 18 kv iec 61000-4-2 contact discharge to gnd 8 human body model 35 esd protection (all other pins) human body model 2 kv max14784e/max14786e/max14787e/max14789e full-duplex, 35kv esd-protected, rs-485 transceivers for high-speed communication www.maximintegrated.com maxim integrated 3 downloaded from: http:///
switching characteristics (max14784e/max14787e) (v cc = 3.0v to 5.5v, t a = t min to t max , unless otherwise noted. typical values are at v cc = 5v, and t a = +25 c.) (notes 2, 5) parameter symbol conditions min typ max units driverdriver propagation delay t dplh r l = 54, c l = 50pf, figures 2, 3 1000 ns t dphl 1000 differential driver output skew |t dplh - t dphl | t dskew r l = 54, c l = 50pf, figures 2, 3 (note 6) 140 ns driver differential output rise or fall time t hl, t lh r l = 54, c l = 50pf, figures 2, 3 900 ns maximum data rate dr max r l = 110, c l = 50pf, figures 4, 5 500 kbps driver enable to output high t dzh r l = 110, c l = 50pf, figures 4, 5 2500 ns driver enable to output low t dzl r l = 110, c l = 50pf, figures 4, 5 2500 ns driver disable time from low t dlz r l = 110, c l = 50pf, figures 4, 5 100 ns driver disable time from high t dhz r l = 110, c l = 50pf, figures 4, 5 100 ns driver enable from shutdown to output high t dzh(shdn) r l = 110, c l = 15pf, figures 4, 5 100 s driver enable from shutdown to output low t dzl(shdn) r l = 110, c l = 15pf, figures 4, 5 100 s time to shutdown t shdn (note 7) 50 800 ns receiverreceiver propagation delay t rplh c l = 15pf, figures 6, 7 200 ns t rphl 200 receiver output skew |t rplh - t rphl | t rskew c l = 15pf, figures 6, 7 (note 6) 30 ns maximum data rate dr max 500 kbps receiver enable to output high t rzh r l = 1k, c l = 15pf, figure 8 30 ns receiver enable to output low t rzl r l = 1k, c l = 15pf, figure 8 30 ns receiver disable time from low t rlz r l = 1k, c l = 15pf, figure 8 30 ns receiver disable time from high t rhz r l = 1k, c l = 15pf, figure 8 30 ns receiver enable from shutdown to output high t rzh(shdn) r l = 1k, c l = 15pf, figure 8 100 s receiver enable from shutdown to output low t rzl(shdn) r l = 1k, c l = 15pf, figure 8 100 s time to shutdown t shdn (note 7) 50 800 ns max14784e/max14786e/max14787e/max14789e full-duplex, 35kv esd-protected, rs-485 transceivers for high-speed communication www.maximintegrated.com maxim integrated 4 downloaded from: http:///
switching characteristics (max14786e/max14789e) (v cc = 3.0v to 5.5v, t a = t min to t max , unless otherwise noted. typical values are at v cc = 5v, and t a = +25 c.) (notes 2, 5) parameter symbol conditions min typ max units driverdriver propagation delay t dplh r l = 54, c l = 50pf, figures 2, 3 25 ns t dphl 25 differential driver output skew |t dplh - t dphl | t dskew r l = 54, c l = 50pf, figures 2, 3 (note 6) 3 ns driver differential output rise or fall time t hl, t lh r l = 54, c l = 50pf, figures 2, 3 10 ns maximum data rate dr max r l = 110, c l = 50pf, figures 4, 5 25 mbps driver enable to output high t dzh r l = 110, c l = 50pf, figures 4, 5 40 ns driver enable to output low t dzl r l = 110, c l = 50pf, figures 4, 5 40 ns driver disable time from low t dlz r l = 110, c l = 50pf, figures 4, 5 40 ns driver disable time from high t dhz r l = 110, c l = 50pf, figures 4, 5 40 ns driver enable from shutdown to output high t dzh(shdn) r l = 110, c l = 15pf, figures 4, 5 100 s driver enable from shutdown to output low t dzl(shdn) r l = 110, c l = 15pf, figures 4, 5 100 s time to shutdown t shdn (note 7) 50 800 ns receiverreceiver propagation delay t rplh c l = 15pf, figures 6, 7 25 ns t rphl 25 receiver output skew |t rplh - t rphl | t rskew c l = 15pf, figures 6, 7 (note 6) 3 ns maximum data rate dr max 25 mbps receiver enable to output high t rzh r l = 1k, c l = 15pf, figure 8 30 ns receiver enable to output low t rzl r l = 1k, c l = 15pf, figure 8 30 ns receiver disable time from low t rlz r l = 1k, c l = 15pf, figure 8 30 ns receiver disable time from high t rhz r l = 1k, c l = 15pf, figure 8 30 ns receiver enable from shutdown to output high t rzh(shdn) r l = 1k, c l = 15pf, figure 8 100 s max14784e/max14786e/max14787e/max14789e full-duplex, 35kv esd-protected, rs-485 transceivers for high-speed communication www.maximintegrated.com maxim integrated 5 downloaded from: http:///
switching characteristics (max14786e/max14789e) (continued) (v cc = 3.0v to 5.5v, t a = t min to t max , unless otherwise noted. typical values are at v cc = 5v, and t a = +25 c.) (notes 2, 5) note 2: all devices 100% production tested at t a = +25c. specifications over temperature are guaranteed by design. note 3: all currents into the device are positive; all currents out of the device are negative. all voltages are referenced to ground, unless otherwise noted. note 4: v od and v oc are the changes in v od and v oc , respectively, when the di input changes state. note 5: capacitive load includes test fixture. note 6: not production tested. guaranteed by design. note 7: shutdown is enabled by bringing re high and de low. if the enabled inputs are in this state for less than 50ns, the device is guaranteed to not enter shutdown. if the enable inputs are in this state for at least 800ns, the device is guaranteed to have entered shutdown. parameter symbol conditions min typ max units receiver enable from shutdown to output low t rzl(shdn) r l = 1k, c l = 15pf, figure 8 100 s time to shutdown t shdn (note 7) 50 800 ns figure 3. driver propagation delays 1.5v 1.5v 0 di z y 20% 80% 20% 80% 0 v o -v o v diff t dskew = |t dplh - t dphl | v diff = v y - v z v cc f = 1mhz, t lh 3ns, t hl 3ns 1/2 v o t dplh t lh t hl t dphl v o 1/2 v o figure 2. driver timing test circuit r l c l v od v cc di de yz figure 1. driver dc test load v od y z v oc r l 2 r l 2 max14784e/max14786e/max14787e/max14789e full-duplex, 35kv esd-protected, rs-485 transceivers for high-speed communication www.maximintegrated.com maxim integrated 6 downloaded from: http:///
figure 4. driver enable and disable times (t dzh , t dhz , t dzh(shdn) ) figure 5. driver enable and disable times (t dzl , t dlz , t dzl(shdn) ) 00 0.25v 1.5v t dzh , t dzh(shdn) t dhz de v cc v oh 1.5v out r l 50 out s1 y z d di 0 or v cc generator de c l r l 50 c l out 00.25v 1.5v t dzl , t dzl(shdn) t dlz de s1 y z d di 0 or v cc v cc v cc 1.5v v cc out v ol generator de figure 6. receiver propagation delay test circuit figure 7. receiver propagation delays v id b a receiveroutput at e r a b v oh v ol ro t rphl t rskew = |t rphl - t rplh | t = 1mhz, t lh 3ns, t hl 3ns t rplh -1v 1v 1.5v 1.5v max14784e/max14786e/max14787e/max14789e full-duplex, 35kv esd-protected, rs-485 transceivers for high-speed communication www.maximintegrated.com maxim integrated 7 downloaded from: http:///
figure 8. receiver enable and disable times generator 50 i r l 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 max14784e/max14786e/max14787e/max14789e full-duplex, 35kv esd-protected, rs-485 transceivers for high-speed communication www.maximintegrated.com maxim integrated 8 downloaded from: http:///
(v cc = 5v, t a = +25c, unless otherwise noted.) 0 10 20 30 40 50 60 70 80 90 100 0 5 10 15 20 25 supply current (ma) data rate (mbps) max14786e/max14789e supply current vs. data rate toc04 5v, no load 3.3v, no load 5v, 54 ? load 3.3v, 54 ? load de = v cc re = gnd 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 -40 -25 -10 5 20 35 50 65 80 95 110 125 supply current (ma) temperature ( c) no load supply current vs.temperature toc01 de = v cc re = gnd no load y and z open v cc = 3.3v v cc = 5v toc01 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 -40 -25 -10 5 20 35 50 65 80 95 110 125 v od (v) temperature ( c) differential driver output voltage vs. temperature toc07 v cc = 5v v cc = 3.3v 0 1 2 3 4 5 6 7 8 9 10 -40 -25 -10 5 20 35 50 65 80 95 110 125 shutdown supply current (a) temperature ( c) max14784e/max14786e shutdown supply current vs. temperature toc02 de = gnd re = v cc v cc = 3.3v v cc = 5v 200 250 300 350 400 450 500 550 600 -40 -25 -10 5 20 35 50 65 80 95 110 125 propagation delay (ns) temperature ( c) max14784e/max14787e driver propagation delay vs. temperature toc08 t dphl , v cc = 3.3v t dplh , v cc = 3.3v t dphl , v cc = 5v t dplh , v cc = 5v 0 10 20 30 40 50 60 70 80 0 100 200 300 400 500 supply current (ma) data rate (kbps) max14784e/max14787e supply current vs. data rate toc03 5v, 54 ? load de = v cc re = gnd 3.3v, 54 ? load 5v, no load 3.3v, no load 0.0 5.0 10.0 15.0 20.0 25.0 30.0 -40 -25 -10 5 20 35 50 65 80 95 110 125 propagation delay (ns) temperature ( c) max14786e/max14789e driver propagation delay vs. temperature toc09 t dphl , v cc = 3.3v t dplh , v cc = 3.3v t dphl , v cc = 5v t dplh , v cc = 5v r l = 54 ? c l = 50pf 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0 10 20 30 40 50 60 v oh (v) output current (ma) receiver output high voltage vs. output current toc05 output sourcing current v cc = 5v v cc = 3.3v 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0 10 20 30 40 50 60 v oh (v) output current (ma) receiver output low voltage vs. output current toc06 output sinking current v cc = 5v v cc = 3.3v maxim integrated 9 www.maximintegrated.com max14784e/max14786e/max14787e/max14789e full-duplex, 35kv esd-protected, rs-485 transceivers for high-speed communication typical operating characteristics downloaded from: http:///
(v cc = 5v, t a = +25c, unless otherwise noted.) 0 1 2 3 4 5 6 -40 -25 -10 5 20 35 50 65 80 95 110 125 rise/fall time (ns) temperature ( c) max14786e/max14789e driver output rise and fall time vs. temperature toc13 t hl , v cc = 3.3v t hl , v cc = 5v t lh , v cc = 3.3v t lh , v cc = 5v -50 -40 -30 -20 -10 0 10 20 30 40 50 -40 -25 -10 5 20 35 50 65 80 95 110 125 t dskew (ns) temperature ( c) max14784e/max14787e differential driver skew vs. temperature toc10 v cc = 3.3v v cc = 5v r l = 54 ? c l = 50pf -5 -4 -3 -2 -1 0 1 2 3 4 5 -40 -25 -10 5 20 35 50 65 80 95 110 125 t dskew (ns) temperature ( c) max14786e/max14789e differential driver skew vs. temperature r l = 54 c l = 50pf toc11 r l = 54 ? c l = 50pf v cc = 3.3v v cc = 5v 0 100 200 300 400 500 600 700 800 900 -40 -25 -10 5 20 35 50 65 80 95 110 125 rise/fall time (ns) temperature ( c) max14784e/max14787e driver output rise and fall time vs. temperature toc12 t hl , v cc = 3.3v t lh , v cc = 3.3v t hl , v cc = 5v t lh , v cc = 5v r l = 54 ? c l = 50pf 0 10 20 30 40 50 60 70 80 90 100 -40 -25 -10 5 20 35 50 65 80 95 110 125 output transition skew (ns) temperature ( c) max14784e/max14787e driver output transition skew vs. temperature toc14 v cc = 3.3v r l = 54 ? c l = 50pf v cc = 5v 0.0 0.1 0.2 0.3 0.4 0.5 0.6 -40 -25 -10 5 20 35 50 65 80 95 110 125 output transition skew (ns) temperature ( c) max14786e/max14789e driver output transition skew vs. temperature toc15 v cc = 3.3v v cc = 5v max14784e/max14787e propagation delay 5v/div (ac coupled) di 5v/div y/a 2v/div z/b 2v/div toc16 100ns loopback configuration ro 5v/div maxim integrated 10 www.maximintegrated.com max14784e/max14786e/max14787e/max14789e full-duplex, 35kv esd-protected, rs-485 transceivers for high-speed communication typical operating characteristics (continued) downloaded from: http:///
(v cc = 5v, t a = +25c, unless otherwise noted.) max14786e/max14789e propagation delay di 5v/div y/a 2v/div z/b 2v/div toc18 10ns loopback configuration ro 5v/div max14784e/max14787e propagation delay 5v/div (ac - coupled) toc17 di 5v/div y/a 2v/div z/b 2v/div 100ns loopback configuration ro 5v/div max14786e/max14789e propagation delay di 5v/div y/a 2v/div z/b 2v/div toc19 10ns loopback configuration ro 5v/div max14784e/max14786e/max14787e/max14789e full-duplex, 35kv esd-protected, rs-485 transceivers for high-speed communication www.maximintegrated.com maxim integrated 11 typical operating characteristics (continued) downloaded from: http:///
pin name function max14784emax14786e max14787emax14789e 1, 8, 13 n.c. no connection. not internally connected. 2 2 ro receiver output. drive re low to enable ro. ro is always active on the max14787e and the max14789e. see the function tables section. 3 re receiver enable. drive re low, or leave unconnected, to enable ro. ro is high imped- ance when re is high. drive re high and de low to enter low-power shutdown mode. re has a weak pulldown to gnd. 4 de driver enable. drive de high, or leave unconnected, to enable the driver outputs. the driver outputs are high impedance when de is low. drive re high and de low to enter low-power shutdown mode (max14784e and max14786e only). 5 3 di driver input. drive de high on the max14784e and max14786e to enable the driver outputs. driver outputs are always active on the max14787e and the max14789e. a low on di forces the noninverting output, y, low and the inverting output, z, high. simi- larly, a high on di forces the noninverting output, y, high and the inverting output, z, low. de has a weak pullup to v cc . 6, 7 4 gnd ground 9 5 y noninverting driver output 10 6 z inverting driver output 11 7 b inverting receiver input 12 8 a noninverting receiver input 14 1 v cc positive supply. bypass v cc to gnd with a 0.1f capacitor as close as possible to the ic. ab de 12 1413 v cc n.c. ro re n.c. top view 34 1211 yn.c. gnd 5 10 z di gnd 67 98 + max14784emax14786e v cc + ro di 1 2 3 4 8 7 6 5 gnd ab z y so max14787emax14789e so / tssop max14784e/max14786e/max14787e/max14789e full-duplex, 35kv esd-protected, rs-485 transceivers for high-speed communication www.maximintegrated.com maxim integrated 12 pin description pin conigurations downloaded from: http:///
detailed description the max14784e/max14786e/max14787e/max14789e are 35kv esd protected rs-485 transceivers intended for high-speed, full-duplex communication. these devices operate from a +3.0v to +5.5v supply and feature true fail-safe circuitry, guaranteeing a logic high on the receiv - er output when inputs are open or shorted. the max14784e and max14787e feature a slew-rate limited driver that minimizes emi and reduces reflections caused by improperly-terminated cables, allowing error- free data transmission at data rates up to 500kbps. the max14784e/max14787e feature an added deglitch filter on the receiver signal path for enhanced noise immu - nity when differential signals have very slow rise and fall times. driver outputs are short-circuit current-limited, with thermal shutdown circuitry that protects drivers against excessive power dissipation. the max14784e/max14786e/max14787e/max14789e transceivers draw 4ma (max) of supply current when unloaded, or when fully-loaded with the drivers disabled. the max14784e and max14786e draw less than 10a (max) of supply current in low-power shutdown mode. true fail-safe the max14784e/max14786e/max14787e/max14789e guarantee a logic-high receiver output when either the receiver inputs are shorted or open, or when they are con - nected to a terminated transmission line with all drivers disabled. if the differential receiver input voltage (v a - v b ) is greater than or equal to -10mv, ro is logic-high. receiver input deglitch filter (max14784e/ max14787e only) the max14784e/max14787e include integrated circuitry to filter received data. this input deglitch filter reduces false triggers that can occur when data is passed over long cables. to minimize impact on the bus, the integrated filter is not connected to the receiver inputs. instead, data is filtered after the differential receiver input but before reaching ro. driver single-ended operation the y and z outputs can either be used in the standard differential operating mode, or can be used a single- ended outputs. since the y and z driver outputs swing rail-to-rail, they can individually be used as standard ttl logic outputs. function tables transmitting inputs outputs re * de* di y z x 1 1 1 0 x 1 0 0 1 0 0 x high-impedance 1 0 x shutdown receiving inputs output re* de* v a - v b ro 0 x -10mv 1 0 x -200mv 0 0 x open/shorted 1 1 1 x high-impedance 1 0 x shutdown * re and de on the max14787e and max14789e are internal. the driver outputs and receiver are always active in these devices. max14784e/max14786e/max14787e/max14789e full-duplex, 35kv esd-protected, rs-485 transceivers for high-speed communication www.maximintegrated.com maxim integrated 13 downloaded from: http:///
half-duplex operation the max14784e/max14786e are full-duplex transceiv - ers with driver and receiver enable/disable functionality. to use these devices in a half-duplex configuration, con - nect the y output to the a input and connect the z output to the b input. driver output protection two mechanisms prevent excessive output current and power dissipation caused by faults or by bus contention. the first, a current limit on the output stage, provides immediate protection against short-circuits over the whole common-mode voltage range. the second, a thermal shut - down circuit, force the driver outputs into a high-impedance state if the die temperature exceeds +160c (typ). low-power shutdown mode (max14784e/ max14786e only) low-power shutdown mode is initiated by bringing both re high and de low. in shutdown, the devices draw only 10a (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. 35kv esd protection esd protection structures are incorporated on all pins to protect against electrostatic discharge encountered dur - ing handling and assembly. the driver outputs and receiv - er inputs of the max14784e/max14786e/max14787e/ max14789e have extra protection against static electric - ity. the esd structures withstand high esd in all states: normal operation, shutdown, and powered down. after an esd event, the devices keep working without latchup or damage. esd protection can be tested in various ways. the trans - mitter outputs and receiver inputs of the max14784e/ max14786e/max14787e/max14789e are characterized for protection to the following limits: 35kv hbm 18kv using the air-gap discharge method speciied in iec 61000-4-2 8kv using the contact discharge method speciied in the 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 (hbm) figure 9 shows the hbm test model, while figure 10 shows the current waveform it generates when dis - charged in a low-impedance state. 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 max14784e/ max14786e/max14787e/max14789e help facilitate designing equipment to meet the iec 61000-4-2 speci - fication without the need for additional esd protection components. the major difference between tests performed using the hbm and iec 61000-4-2 is higher peak current in iec 61000-4-2 due to lower series resistance in the iec 61000-4-2 model. hence, the esd withstand voltage measured to iec 61000-4-2 is generally lower than that measured using the hbm. figure 11 shows the iec 61000-4-2 model, while figure 12 shows the current waveform for iec 61000-4-2 esd contact discharge test. max14784e/max14786e/max14787e/max14789e full-duplex, 35kv esd-protected, rs-485 transceivers for high-speed communication www.maximintegrated.com maxim integrated 14 downloaded from: http:///
figure 9. human body esd test model figure 10. human body current waveform charge-current- limit resistor discharge resistance storagecapacitor 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 figure 11. iec 61000-4-2 esd test model figure 12. iec 61000-4-2 esd generator current waveform charge-current- limit resistor discharge resistance storagecapacitor 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 ro de di y z b a re r d ro de di yz b a re r d ro de di y z b a re r d ro de di y z b a re r d max14784emax14786e master slave slave slave typical application circuit max14784e/max14786e/max14787e/max14789e full-duplex, 35kv esd-protected, rs-485 transceivers for high-speed communication www.maximintegrated.com maxim integrated 15 downloaded from: http:///
package information for the latest package outline information and land patterns (footprints), 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. package type package code outline no. land pattern no. 8 so s8+4 21-0041 90-0096 14 so s14+1 21-0041 90-0112 14 tssop u14+1 21-0066 90-0113 ordering information/selector guide part data rate (max) driver slew- rate limited deglitched receiver signal driver/ receiver enable temp range pin- package max14784e asd+ 500kbps yes yes yes -40c to +125c 14 so max14786e asd+ 25mbps no no yes -40c to +125c 14 so MAX14786EAUD+ 25mbps no no yes -40c to +125c 14 tssop max14787e gsa+ 500kbps yes yes no -40c to +105c 8 so max14789e gsa+ 25mbps no no no -40c to +105c 8 so +denotes a lead(pb)-free/rohs-compliant package. typical application circuit (continued) ro di y z b a d r ro di yz b a d r max14787e max14789e max14784e/max14786e/max14787e/max14789e full-duplex, 35kv esd-protected, rs-485 transceivers for high-speed communication www.maximintegrated.com maxim integrated 16 chip information process: bicmos downloaded from: http:///
revision history revision number revision date description pages changed 0 12/13 initial release 1 6/14 removed future product asterisk from max14789e 1 2 1/15 updated general description and beneits and features sections 1 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 speciications without n otice 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. maxim integrated and the maxim integrated logo are trademarks of maxim integrated products, inc. ? 2015 maxim integrated products, inc. 17 max14784e/max14786e/max14787e/max14789e full-duplex, 35kv esd-protected, rs-485 transceivers for high-speed communication for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxim integrateds website at www.maximintegrated.com. downloaded from: http:///

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