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general description the max13485e/MAX13486E +5v, half-duplex, ?5kv esd-protected rs-485 transceivers feature one driver and one receiver. these devices include fail-safe circuitry, guaranteeing a logic-high receiver output when receiver inputs are open or shorted. the receiver outputs a logic- high if all transmitters on a terminated bus are disabled (high impedance). the max13485e/MAX13486E include a hot-swap capability to eliminate false transitions on the bus during power-up or live-insertion. the max13485e features reduced slew-rate drivers that minimize emi and reduce reflections caused by improperly terminated cables, allowing error-free trans- mission up to 500kbps. the MAX13486E driver slew rate is not limited, allowing transmit speeds up to 16mbps. the max13485e/MAX13486E feature a 1/4-unit load receiver input impedance, allowing up to 128 transceivers on the bus. these devices are intended for half-duplex communications. all driver outputs are protected to ?5kv esd using the human body model. the max13485e/ MAX13486E are available in 8-pin so and space-saving 8-pin ?fn packages. the devices operate over the extended -40? to +85? temperature range. applications utility meters industrial controls industrial motor drives automated hvac systems features +5v operation true fail-safe receiver while maintaining eia/tia-485 compatibility hot-swappable for telecom applications enhanced slew-rate limiting facilitates error- free data transmission (max13485e) high-speed version (max13488e) allows for transmission speeds up to 16mbps extended esd protection for rs-485/rs-422 i/o pins ?5kv using human body model 1/4 unit load, allowing up to 128 transceivers on the bus available in space-saving 8-pin ?fn or industry standard 8-pin so packages max13485e/MAX13486E half-duplex rs-485/rs-422 transceivers in dfn ________________________________________________________________ maxim integrated products 1 19-0742; rev 0; 1/07 for pricing, delivery, and ordering information, please contact maxim/dallas direct! at 1-888-629-4642, or visit maxim? website at www.maxim-ic.com. ordering information/ selector guide part pin- package slew-rate limited pkg code max13485e ela+t 8 dfn yes l822-1 max13485eesa+ 8 so yes s8-2 MAX13486E ela+t 8 dfn no l822-1 MAX13486Eesa+ 8 so no s8-2 + denotes a lead-free package. note : all devices are specified over the -4 0 c to +85? operating temperature range. rt re ro b a a b rt r d ro di 8 7 6 5 1 2 3 4 re de r di d de + 123 87 4 65 v cc a gndb ro didere max13485e MAX13486E dfn + a gnddi 1 2 8 7 v cc bre de ro so so 3 4 6 5 r d + top view gnd v cc 0.1 f max13485e MAX13486E pin configurations
max13485e/MAX13486E half-duplex rs-485/rs-422 transceivers in dfn 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 ........................................................................................+6v de, re , di.................................................................-0.3v to +6v a, b ..............................................................................-8v to 13v short-circuit duration (ro, a, b) to gnd ..................continuous continuous power dissipation (t a = +70 c) 8-pin so (derate 5.9mw/ c above +70 c)..................471mw 8-pin dfn (derate 4.8mw/ c above +70 c) ..........380.6mw operating temperature range ...........................-40 c to +85 c junction temperature ......................................................+150 c storage temperature range .............................-65 c to +150 c lead temperature (soldering, 10s) .................................+300 c electrical characteristics (v cc = +5v 5%, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v and t a = +25 c.) (notes 1, 2) parameter symbol conditions min typ max units driver r diff = 100 ? , figure 1 2.0 v cc r diff = 54 ? , figure 1 1.5 differential driver output v od no load v cc v change in magnitude of differential output voltage ? v od r diff = 100 ? or 54 ? , figure 1 (note 3) 0.2 v driver common-mode output voltage v oc r diff = 100 ? or 54 ? , figure 1 v cc / 2 3v change in magnitude of common-mode voltage ? v oc r diff = 100 ? or 54 ? , figure 1 (note 3) 0.2 v input-high voltage v ih di, de, re 2.0 v input-low voltage v il di, de, re 0.8 v input current i in di, de, re 1 a 0v < v out < +12v +50 +250 driver short-circuit output current (note 4) i osd -7v < v out < 0v -250 -50 ma (v cc - 1v) < v out < +12v 20 driver short-circuit foldback output current note 3) i osdf -7v < v out < 0v -20 ma receiver v in = +12v 250 input current (a and b) i a, b de = gnd, v cc = gnd or +5v v in = -7v -200 a receiver-differential-threshold voltage v th -7v < v cm < +12v -200 -50 mv receiver input hysteresis ? v th v a + v b = 0v 25 mv output-high voltage v oh i o = -1.6ma, v a - v b > v th v cc - 1.5 v
max13485e/MAX13486E half-duplex rs-485/rs-422 transceivers in dfn _______________________________________________________________________________________ 3 electrical characteristics (continued) (v cc = +5v 5%, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v and t a = +25 c.) (notes 1, 2) parameter symbol conditions min typ max units output-low voltage v ol i o = 1ma, v a - v b < -v th 0.4 v tri-state output current at receiver i ozr 0v < v o < v cc 1 a receiver input resistance r in -7v < v cm < +12v 48 k ? receiver-output short-circuit current i osr 0v < v ro < v cc 7 95 ma power supply supply voltage v cc 4.75 5.25 v supply current i cc de = 1, re = 0, no load 4.5 ma shutdown supply current i shdn de = 0, re = 1 10 a esd protection air gap discharge iec61000-4-2 (max13485e) 15 esd protection (a, b) human body model 15 kv esd protection (all other pins) human body model 2 kv switching characteristics?ax13485e (v cc = +5v 5%, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v and t a = +25 c.) (note 1) parameter symbol conditions min typ max units driver t dplh 200 1000 driver propagation delay t dphl r diff = 54 ? , c l = 50pf, figures 2 and 3 200 1000 ns t hl 250 900 driver-differential output rise or fall time t lh r diff = 54 ? , c l = 50pf, figures 2 and 3 250 900 ns driver-differential output skew |t dplh - t dphl | t dskew r diff = 54 ? , c l = 50pf, figures 2 and 3 140 ns maximum data rate 500 kbps driver enable to output high t dzh figures 4 and 5 2500 ns driver enable to output low t dzl figures 4 and 5 2500 ns driver disable time from high t dhz figures 4 and 5 100 ns driver disable time from low t dlz figures 4 and 5 100 ns driver enable from shutdown to output high t dzh ( shdn ) figures 4 and 5 5500 ns driver enable from shutdown to output low t dzl ( shdn ) figures 4 and 5 5500 ns time to shutdown t shdn 50 340 700 ns receiver t rplh 80 receiver propagation delay t rphl c l = 15pf, figures 6 and 7 80 ns receiver output skew t rskew c l = 15pf, figure 7 13 ns maximum data rate 500 kbps
max13485e/MAX13486E half-duplex rs-485/rs-422 transceivers in dfn 4 _______________________________________________________________________________________ switching characteristics max13485e (continued) (v cc = +5v 5%, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v and t a = +25 c.) (note 1) parameter symbol conditions min typ max units receiver enable to output high t rzh figure 8 50 ns receiver enable to output low t rzl figure 8 50 ns receiver disable time from high t rhz figure 8 50 ns receiver disable time from low t rlz figure 8 50 ns receiver enable from shutdown to output high t rzh ( shdn ) figure 8 2200 ns receiver enable from shutdown to output low t rzl ( shdn ) figure 8 2200 ns time to shutdown t shdn 50 340 700 ns switching characteristics MAX13486E (v cc = +5v 5%, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v and t a = +25 c.) (note 1) parameter symbol conditions min typ max units driver t dplh 50 driver propagation delay t dphl r diff = 54 ? , c l = 50pf, figures 2 and 3 50 ns t hl 15 driver differential output rise or fall time t lh r diff = 54 ? , c l = 50pf, figures 2 and 3 15 ns differential driver output skew |t dplh - t dphl | t dskew r diff = 54 ? , c l = 50pf, figures 2 and 3 8 ns maximum data rate 16 mbps driver enable to output high t dzh figures 4 and 5 50 ns driver enable to output low t dzl figures 4 and 5 50 ns driver disable time from high t dhz figures 4 and 5 50 ns driver disable time from low t dlz figures 4 and 5 50 ns driver enable from shutdown to output high t dzh ( shdn ) figures 4 and 5 2200 ns driver enable from shutdown to output low t dzl ( shdn ) figures 4 and 5 2200 ns time to shutdown t shdn 50 340 700 ns receiver t rplh 80 receiver propagation delay t rphl c l = 15pf, figures 6 and 7 80 ns receiver output skew t rskew c l = 15pf, figure 7 13 ns maximum data rate 16 mbps
max13485e/MAX13486E half-duplex rs-485/rs-422 transceivers in dfn _______________________________________________________________________________________ 5 switching characteristics MAX13486E (continued) (v cc = +5v 5%, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v and t a = +25 c.) (note 1) parameter symbol conditions min typ max units receiver enable to output high t rzh figure 8 50 ns receiver enable to output low t rzl figure 8 50 ns receiver disable time from high t rhz figure 8 50 ns receiver disable time from low t rlz figure 8 50 ns receiver enable from shutdown to output high t rzh ( shdn ) figure 8 2200 ns receiver enable from shutdown to output low t rzl ( shdn ) figure 8 2200 ns time to shutdown t shdn 50 340 700 ns note 1: dfn devices production tested at +25 c. overtemperature limits are generated by design. note 2: all currents into the device are positive. all currents out of the device are negative. all voltages referred to device ground, unless otherwise noted. note 3: ? v od and ? v oc are the changes in v od and v oc when the di input changes states. note 4: the short-circuit output current applied to peak current just prior to foldback current limiting. the short-circuit foldback output current applies during current limiting to allow a recovery from bus contention. typical operating characteristics (v cc = +5v, t a = +25 c, unless otherwise noted.) 3.0 3.2 3.6 3.4 3.8 4.0 -40 10 -15 35 60 85 supply current vs. temperature max13485-86e toc01 temperature ( c) supply current (ma) no load 0 7 21 14 28 35 02 1345 output current vs. receiver output high voltage max13485-86e toc02 output high voltage (v) output current (ma) 0 20 10 40 30 50 60 02 1345 output current vs. receiver output low voltage max13485-86e toc03 output low voltage (v) output current (ma)
max13485e/MAX13486E half-duplex rs-485/rs-422 transceivers in dfn 6 _______________________________________________________________________________________ typical operating characteristics (continued) (v cc = +5v, t a = +25 c, unless otherwise noted.) 4.0 4.4 4.2 4.8 4.6 5.2 5.0 5.4 -40 10 -15 35 60 85 receiver output high voltage vs. temperature max13485-86e toc04 temperature ( c) output high voltage (v) i o = 1ma 0 0.1 0.3 0.2 0.4 0.5 -40 10 -15 35 60 85 receiver output low voltage vs. temperature max13485-86e toc05 temperature ( c) output low voltage (v) i o = 1ma differential ouput current vs. differential output voltage max13485-86e toc06 output voltage (v) output current (ma) 4 3 2 1 20 40 60 80 0 05 0 1.0 0.5 2.0 1.5 2.5 3.0 -40 10 -15 356085 driver-differential output voltage vs. temperature max13485-86e toc07 temperature ( c) differential output voltage (v) 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 max13485-86e toc08 output high voltage (v) output current (ma) 0 40 20 80 60 100 120 046 281012 output current vs. transmitter output low voltage max13485-86e toc09 output low voltage (v) output current (ma) 0 3 2 1 4 5 6 7 8 9 10 -40 10 -15 35 60 85 shutdown current vs. temperature max13485-86e toc10 temperature ( c) shutdown current ( a) 300 400 350 500 450 550 600 -40 10 -15 35 60 85 driver propagation vs. temperature (max13485e) max13485-86e toc11 temperature ( c) driver propagation delay (ns) t dplh t dphl 0 10 5 20 15 25 30 -40 10 -15 35 60 85 driver propagation delay vs. temperature (MAX13486E) max13485-86e toc12 temperature ( c) driver propagation delay (ns) t dplh t dphl
max13485e/MAX13486E half-duplex rs-485/rs-422 transceivers in dfn _______________________________________________________________________________________ 7 typical operating characteristics (continued) (v cc = +5v, t a = +25 c, unless otherwise noted.) receiver propagation vs. temperature (max13485e) max13485-86e toc13 temperature ( c) propagation delay (ns) 60 35 10 -15 20 40 60 80 0 -40 85 t rphl t rplh receiver propagation vs. temperature (MAX13486E) max13485-86e toc14 temperature ( c) receiver propagation (ns) 60 35 10 -15 10 20 30 40 0 -40 85 t rphl t rplh 400ns/div driver propagation (500kbps) (max13485e) di 2v/div max13485/86e toc15 a-b 5v/div 10ns/div driver propagation (16mbps) (MAX13486E) di 2v/div max13485/86e toc16 a-b 5v/div 10ns/div receiver propagation (16mbps) (MAX13486E) b 2v/div max13485/86e toc17 ro 2v/div a 2v/div
max13485e/MAX13486E half-duplex rs-485/rs-422 transceivers in dfn 8 _______________________________________________________________________________________ v oc a b r diff 2 r diff v od c l 2 figure 1. driver dc test load a b de di 5v r diff c l v id figure 2. driver timing test circuit 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 v cc f = 1mhz, t lh 3ns, t hl 3ns figure 3. driver propagation delays test circuits and waveforms
max13485e/MAX13486E half-duplex rs-485/rs-422 transceivers in dfn _______________________________________________________________________________________ 9 1.5v 1.5v a, b 0 0 output normally low de output normally high t dzl(shdn) ,t dzl t dzh(shdn) ,t dzh t dlz t dhz 2.3v 2.3v v ol + 0.5v v oh + 0.5v a, b v ol v cc figure 4. driver enable and disable times ate v id a b r receiver output figure 6. receiver propagation delay test circuit output under test 500 ? s1 s2 v cc c l figure 5. driver-enable and -disable-timing test load 1.5v 1.5v 1v -1v f = 1mhz, t lh 3ns, t hl 3ns t rphl t rplh v oh v ol ro a b t rskew = |t rphl - t rplh | figure 7. receiver propagation delays test circuits and waveforms (continued)
max13485e/MAX13486E half-duplex rs-485/rs-422 transceivers in dfn 10 ______________________________________________________________________ pin description pin name function 1 ro receiver output 2 re receiver output enable. drive re low to enable ro. ro is high impedance when re is high. drive re high and de low to enter low-power shutdown mode. re is a hot-swap input (see the hot-swap capability section for more details). 3de driver output enable. drive de high to enable the driver outputs. these outputs are high-impedance when de is low. drive re high and de low to enter low-power shutdown mode. de is a hot-swap input (see the hot-swap capability section for more details). 4di driver input. drive di low to force noninverting output low and inverting output high. drive di high to force noninverting output high and inverting output low (see the function tables ). 5 gnd ground 6 a noninverting receiver input and noninverting driver output 7 b inverting receiver input and inverting driver output 8v cc positive supply, v cc = +5v 5%. bypass v cc to gnd with a 0.1f capacitor. transmitting input output re de di b a x11 0 1 x10 1 0 0 0 x high impedance high impedance 1 0 x 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 1 0 x shutdown function tables x = don t care, shutdown mode, driver, and receiver outputs are in high impedance.
max13485e/MAX13486E half-duplex rs-485/rs-422 transceivers in dfn __________________________________________________________________________ +1v -1v generator v id s3 s2 s1 1k ? cl 15pf 50 ? v cc ro re re ro re ro ro re v cc /2 v cc v cc v cc v ol 0 0 0 0 0 0 v oh v oh 0.25v 0.25v v oh /2 s1 open s2 closed s3 = +1v s1 closed s2 open s3 = -1v s1 open s2 closed s3 = +1v s1 closed s2 open s3 = -1v t rzh , t rzh(shdn) t rzl , t rzl(shdn) t rlz t rhz v cc /2 v cc /2 v cc (v ol + v cc )/2 v cc v cc v ol v cc /2 figure 8. receiver enable and disable times test circuits and waveforms (continued)
max13485e/MAX13486E detailed description the max13485e/MAX13486E half-duplex, high-speed transceivers for rs-485/rs-422 communication contain one driver and one receiver. these devices feature fail- safe circuitry that guarantees a logic-high receiver out- put when receiver inputs are open or shorted, or when they are connected to a terminated transmission line with all drivers disabled (see the fail-safe section). the max13485e/MAX13486E also feature a hot-swap capa- bility allowing line insertion without erroneous data transfer (see the hot-swap capability section). the max13485e features reduced slew-rate drivers that minimize emi and reduce reflections caused by improperly terminated cables, allowing error-free trans- mission up to 500kbps. the MAX13486E driver slew rate is not limited, making transmit speeds up to 16mbps possible. fail-safe the max13485e/MAX13486E guarantee a logic-high receiver output when the receiver inputs are shorted or open, or when they are connected to a terminated transmission line with all drivers disabled. this is done by setting the receiver input threshold between -50mv and -200mv. if the 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 max13485e/MAX13486E, this results is a logic-high with a 50mv minimum noise margin. unlike previous fail-safe devices, the -50mv to -200mv threshold complies with the 200mv eia/tia-485 standard. hot-swap capability hot-swap inputs when circuit boards are inserted into a hot or powered backplane, differential disturbances to the data bus can lead to data errors. upon initial circuit-board inser- tion, the data communication processor undergoes its own power-up sequence. during this period, the processor s logic-output drivers are high impedance and are unable to drive the de and re inputs of these devices to a defined logic level. leakage currents up to 10a from the high impedance state of the proces- sor s logic drivers could cause standard cmos enable inputs of a transceiver to drift to an incorrect logic level. additionally, parasitic circuit-board capacitance could cause coupling of v cc or gnd to the enable inputs. without the hot-swap capability, these factors could improperly enable the transceiver s driver or receiver. when v cc rises, an internal pulldown circuit holds de low and re high. after the initial power-up sequence, the pulldown circuit becomes transparent, resetting the hot-swap tolerable input. hot-swap input circuitry the enable inputs feature hot-swap capability. at the input there are two nmos devices, m1 and m2 (figure 9). when v cc ramps from zero, an internal 7s timer turns on m2 and sets the sr latch, which also turns on m1. transistors m2, a 1.5ma current sink, and m1, a 500a current sink, pull de to gnd through a 5k ? resistor. m2 is designed to pull de to the disabled state against an external parasitic capacitance up to 100pf that can drive de high. after 7s, the timer deactivates m2 while m1 remains on, holding de low against tri- 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 . half-duplex rs-485/rs-422 transceivers in dfn 12 ______________________________________________________________________________________ de de (hot swap) 5k ? timer timer v cc 10 s m2 m1 500 a 100 a sr latch figure 9. simplified structure of the driver enable pin (de)
+ 15v esd protection as with all maxim devices, esd-protection structures are incorporated on all pins to protect against electro- static discharges encountered during handling and assembly. the driver outputs and receiver inputs of the max13485e/MAX13486E have extra protection against static electricity. maxim s engineers have developed state-of-the-art structures to protect these pins against esd of 15kv without damage. the esd structures withstand high esd in all states: normal operation, shut- down, and powered down. after an esd event, the max13485e/MAX13486E keep working without latchup or damage. esd protection can be tested in various ways. the trans- mitter outputs and receiver inputs of the max13485e/ MAX13486E are characterized for protection to the follow- ing limits: 15kv using the human body model 15kv using the air gap discharge method specified in iec 61000-4-2 (max13485e only) esd test conditions esd performance depends on a variety of conditions. contact maxim for a reliability report that documents test setup, test methodology, and test results. human body model figure 10a shows the human body model, and figure 10b shows the current waveform it generates when dis- charged into a low impedance. this model consists of a 100pf capacitor charged to the esd voltage of inter- est, 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 max13485e/MAX13486E help equipment designs to meet iec 61000-4-2, without the need for additional esd-protection components. the major difference between tests done using the human body model and iec 61000-4-2 is higher peak current in iec 61000-4-2 because series resistance is lower in the iec 61000-4-2 model. hence, the esd max13485e/MAX13486E half-duplex rs-485/rs-422 transceivers in dfn ______________________________________________________________________________________ 13 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 10a. 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 10b. human body current waveform charge-current limit resistor discharge resistance storage capacitor c s 150pf r c 50m ? to 100m ? r d 330 ? high- voltage dc source device under test figure 10c. ice 61000-4-2 esd test model t r = 0.7ns to 1ns 30ns 60ns t 100% 90% 10% i peak i figure 10d. iec 61000-4-2 esd generator current waveform
max13485e/MAX13486E withstand voltage measured to iec 61000-4-2 is gener- ally lower than that measured using the human body model. figure 10c shows the iec 61000-4-2 model, and figure 10d shows the current waveform for the iec 61000-4-2 esd contact discharge test. machine model the machine model for esd tests all pins using a 200pf storage capacitor and zero discharge resistance. the objective is to emulate the stress caused when i/o pins are contacted by handling equipment during test and assembly. of course, all pins require this protec- tion, not just rs-485 inputs and outputs. the air-gap test involves approaching the device with a charged probe. the contact-discharge method connects the probe to the device before the probe is energized. applications information 128 transceivers on the bus the standard rs-485 receiver input impedance is 12k ? (1-unit load), and the standard driver can drive up to 32-unit loads. the max13485e/MAX13486E have a 1/4- unit load receiver input impedance (48k ? ), allowing up to 128 transceivers to be connected in parallel on one communication line. any combination of these devices, as well as other rs-485 transceivers with a total of 32- unit loads or fewer, can be connected to the line. reduced emi and reflections the max13485e features 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 by bringing both re high and de low. in shutdown, the devices draw a maximum of 10a of supply current. re and de can be driven simultaneously. the devices are guaranteed not to enter shutdown if re is high and de is low for less than 50ns. if the inputs are in this state for at least 700ns, the devices are guaranteed to enter shutdown. enable times t zh and t zl (see the switching character- istics ) assume the devices were not in a low-power shut- down 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 rs-485/rs-422 standard covers line lengths up to 4000ft. typical applications the max13485e/MAX13486E transceivers are designed for half-duplex, bidirectional data communi- cations on multipoint bus transmission lines. figure 11 shows typical network applications circuits. to mini- mize 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 max13485e is more tolerant of imperfect termination. chip information process: bicmos half-duplex rs-485/rs-422 transceivers in dfn 14 ______________________________________________________________________________________ r r r d d d di di ro ro re re r t r t r d di ro re di ro re de de de de max13485e MAX13486E figure 11. typical half-duplex rs-485 network
max13485e/MAX13486E half-duplex rs-485/rs-422 transceivers in dfn ______________________________________________________________________________________ 15 package information (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation, go to www.maxim-ic.com/packages .) soicn .eps package outline, .150" soic 1 1 21-0041 b rev. document control no. approval proprietary information title: top view front view max 0.010 0.069 0.019 0.157 0.010 inches 0.150 0.007 e c dim 0.014 0.004 b a1 min 0.053 a 0.19 3.80 4.00 0.25 millimeters 0.10 0.35 1.35 min 0.49 0.25 max 1.75 0.050 0.016 l 0.40 1.27 0.394 0.386 d d min dim d inches max 9.80 10.00 millimeters min max 16 ac 0.337 0.344 ab 8.75 8.55 14 0.189 0.197 aa 5.00 4.80 8 n ms012 n side view h 0.244 0.228 5.80 6.20 e 0.050 bsc 1.27 bsc c h e e b a1 a d 0-8 l 1 variations:
6, 8, 10l udfn.eps even terminal l c odd terminal l c l e l a e e d pin 1 index area b e a b n solder mask coverage a a 1 pin 1 0.10x45 l l1 (n/2 -1) x e) xxxx xxxx xxxx sample marking a1 a2 7 a 1 2 21-0164 package outline, 6, 8, 10l udfn, 2x2x0.80 mm -drawing not to scale- common dimensions symbol min. nom. a 0.70 0.75 a1 d 1.95 2.00 e 1.95 2.00 l 0.30 0.40 pkg. code n e b package variations l1 6 l622-1 0.65 bsc 0.30?0.05 0.25?0.05 0.50 bsc 8 l822-1 0.20?0.03 0.40 bsc 10 l1022-1 2.05 0.80 max. 0.50 2.05 0.10 ref. (n/2 -1) x e 1.60 ref. 1.50 ref. 1.30 ref. a2 - -drawing not to scale- a 2 2 21-0164 package outline, 6, 8, 10l udfn, 2x2x0.80 mm 0.15 0.20 0.25 0.020 0.025 0.035 package information (continued) (the package drawing(s) in this data sheet may not reflect the most current specifications. for the latest package outline info rmation, go to www.maxim-ic.com/packages .) max13485e/MAX13486E half-duplex rs-485/rs-422 transceivers in dfn 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. 16 ____________________maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ? 2007 maxim integrated products is a registered trademark of maxim integrated products, inc. boblet

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