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for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642,or visit maxim's website at www.maxim-ic.com. max3060e/max3061e/max3062e 15kv esd-protected, fail-safe, 20mbps, slew-rate- limited rs-485/rs-422 transceivers in a sot ________________________________________________________________ maxim integrated products 1 general description the max3060e/max3061e/max3062e high-speedtransceivers for rs-485/rs-422 communication contain one driver and one receiver. these devices feature fail- safe circuitry, which guarantees a logic-high receiver output when the receiver inputs are open or shorted. this means that the receiver output is a logic high if all transmitters on a terminated bus are disabled (high impedance). these devices also feature hot-swap cir- cuitry that eliminates data glitches during hot insertion. the max3060e features slew-rate-limited drivers that minimize emi and reduce reflections caused by improperly terminated cables, allowing error-free data transmission up to 115kbps. the max3061e, also slew- rate limited, transmits up to 500kbps. the max3062e driver is not slew-rate limited, allowing transmit speeds up to 20mbps. all transmitter outputs are protected to ?5kv using the human body model. these transceivers typically draw 910? of supply current when unloaded, or 790? when fully loaded with the drivers disabled. all devices have a 1/8-unit-load receiver input imped- ance that allows up to 256 transceivers on the bus. these devices are intended for half-duplex communication. applications rs-422/rs-485 communicationslevel translators transceivers for emi-sensitive applications industrial-control local-area networks features ? true fail-safe receiver while maintaining eia/tia-485 compatibility ? enhanced slew-rate limiting facilitates error-free data transmission (max3060e and max3061e) ? 1na low-current shutdown mode ? hot-swappable for telecom applications ? esd protection: ?5kv human body model ? allow up to 256 transceivers on the bus ? space-saving 8-pin sot23 package 19-2536; rev 1; 7/07 ordering information part temp range pin- package top mark max3060e eka-t -40? to +85? 8 sot23-8 aaki MAX3060EEKA#t -40? to +85? 8 sot23-8 aepa* max3061e eka-t -40? to +85? 8 sot23-8 aakj max3061eeka#t -40? to +85? 8 sot23-8 aepb* max3062e eka-t -40? to +85? 8 sot23-8 aakk max3062eeka#t -40? to +85? 8 sot23-8 aepc* selector guide part data rate (mbps) slew- rate limited transceivers on bus max3060e 0.115 yes 256 max3061e 0.5 yes 256 max3062e 20 no 256 max3060e max3061e max3062e 12 3 4 85 v cc 0.1 f gnd di de re ro r d rt rt 76 d r de re di ro a b b a top view +5v typical operating circuit/pin configuration * indicates an rohs-compliant part t = tape and reel downloaded from: http:///
max3060e/max3061e/max3062e 15kv esd-protected, fail-safe, 20mbps, slew-rate- limited rs-485/rs-422 transceivers in a sot 2 _______________________________________________________________________________________ absolute maximum ratings dc 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?.) (notes 1, 2) stresses beyond those listed under ?bsolute 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. all voltages with respect to gndsupply voltage (v cc ) ............................................................+7v input voltage ( re , de, di)..........................-0.3v to (v cc + 0.3v) driver output/receiver input voltage (a, b) .......-7.5v to +12.5v receiver output voltage (ro)....................-0.3v to (v cc + 0.3v) continuous power dissipation (t a = +70?) 8-pin sot23 (derate 8.9mw/? above +70?)............714mw operating temperature range max306_ee_ _ ................................................-40? to +85? storage temperature range .............................-65? to +150? junction temperature ......................................................+150? lead temperature (soldering, 10s) .................................+300? parameter symbol conditions min typ max units driver differential driver output(no load) v od1 v cc = 5v 5 v figure 1, r = 50 (rs-422) 2.0 differential driver output v od2 figure 1, r = 27 (rs-485) 1.5 v change in magnitude ofdifferential output voltage ? v od figure 1, r = 50 or r = 27 (note 3) 0.2 v driver common-mode outputvoltage v oc figure 1, r = 50 or r = 27 3v change in magnitude ofcommon-mode voltage ? v oc figure 1, r = 50 or r = 27 (note 3) 0.2 v input high voltage v ih de, di, re 2.0 v input low voltage v il de, di, re 0.8 v di input hysteresis v hys 100 mv input current i in1 de, di, re ? ? hot-swap driver input current i hotswap de, re (note 4) ?00 ? v in = +12v 125 input current (a and b) i in2 de = gnd,v cc = gnd or 5.25v v in = -7v -100 ? driver short-circuit output current v od1 -7v v out +12v, t a = +25? (note 5) ?5 ?50 ma iec 1000-4-2 air-gap discharge ? iec 1000-4-2 contact discharge ? esd protection for a, b human body model ?5 kv downloaded from: http:///
max3060e/max3061e/max3062e 15kv esd-protected, fail-safe, 20mbps, slew-rate- limited rs-485/rs-422 transceivers in a sot _______________________________________________________________________________________ 3 dc electrical characteristics (continued)(v cc = +5v ?%, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v and t a = +25?.) (notes 1, 2) parameter symbol conditions min typ max units receiver receiver differential thresholdvoltage v th -7v vcm +12v -200 -125 -50 mv receiver input hysteresis ? v th 25 mv receiver output high voltage v oh i o = -4ma, v id = -50mv v cc - 1.5 v receiver output low voltage v ol i o = 4ma, v id = -200mv 0.4 v three-state output current atreceiver i ozr 0v v o v cc 0.01 ? ? receiver input resistance r in -7v v cm +12v 96 k receiver output short-circuitcurrent i osr 0v v ro v cc ? ?0 ma supply current de = re = gnd 790 1400 supply current i cc no load,di = gnd or v cc de = re = v cc 910 1500 ? supply current in shutdownmode i shdn de = gnd, re = v cc 0.001 1 a downloaded from: http:///
max3060e/max3061e/max3062e 15kv esd-protected, fail-safe, 20mbps, slew-rate- limited rs-485/rs-422 transceivers in a sot 4 _______________________________________________________________________________________ switching characteristics?ax3060e(v cc = +5v ?%, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v and t a = +25?.) (notes 1, 2) parameter symbol conditions min typ max units driver input to output t dplh , t dphl figures 3 and 5, r diff = 54 , c diff = 50pf 1.0 1.7 2.4 ? driver output skew(t dplh - t dphl ) t dskew figures 3 and 5, r diff = 54 , c diff = 50pf -200 -7 +200 ns driver rise or fall time t dr , t df figures 3 and 5, r diff = 54 , c diff = 50pf 1.3 1.85 2.5 ? maximum data rate f max 115 kbps driver enable to output high t dzh figures 4 and 6, c l = 100pf, s2 closed 0.6 1.5 ? driver enable to output low t dzl figures 4 and 6, c l = 100pf, s1 closed 0.5 1.5 ? driver disable time from low t dlz figures 4 and 6, c l = 15pf, s1 closed 60 200 ns driver disable time from high t dhz figures 4 and 6, c l = 15pf, s2 closed 85 200 ns receiver input to output t rplh , t rphl figures 7 and 9; | v id | 2.0v; rise and fall time of v id 4ns, c l = 15pf 47 80 ns differential receiver skew(t rplh - t rphl ) t rskd figures 7 and 9; | v id | 2.0v; rise and fall time of v id 4ns, c l = 15pf -10 -3 +10 ns receiver enable to output low t rzl figures 2 and 8, c l = 15pf, s1 closed 50 ns receiver enable to output high t rzh figures 2 and 8, c l = 15pf, s2 closed 50 ns receiver disable time from low t rlz figures 2 and 8, c l = 15pf, s1 closed 50 ns receiver disable time from high t rhz figures 2 and 8, c l = 15pf, s2 closed 50 ns time to shutdown t shdn (note 6) 50 180 600 ns driver enable from shutdown tooutput high t dzh ( shdn ) figures 4 and 6, c l = 100pf, s2 closed 2 s driver enable from shutdown tooutput low t dzl ( shdn ) figures 4 and 6, c l = 100pf, s1 closed 2 s receiver enable from shutdownto output high t rzh ( shdn ) figures 2 and 8, c l = 15pf, s2 closed 1.5 ? receiver enable from shutdownto output low t rzl ( shdn ) figures 2 and 8, c l = 15pf, s1 closed 1.5 ? downloaded from: http:///
max3060e/max3061e/max3062e 15kv esd-protected, fail-safe, 20mbps, slew-rate- limited rs-485/rs-422 transceivers in a sot _______________________________________________________________________________________ 5 switching characteristics?ax3061e(v cc = +5v ?%, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v and t a = +25?.) (notes 1, 2) parameter symbol conditions min typ max units driver input to output t dplh , t dphl figures 3 and 5, r diff = 54 , c diff = 50pf 250 470 800 ns driver output skew(t dplh - t dphl ) t dskew figures 3 and 5, r diff = 54 , c diff = 50pf -100 -4 +100 ns driver rise or fall time t dr , t df figures 3 and 5, r diff = 54 , c diff = 50pf 200 530 750 ns maximum data rate f max 500 kbps driver enable to output high t dzh figures 4 and 6, c l = 100pf, s2 closed 330 1000 ns driver enable to output low t dzl figures 4 and 6, c l = 100pf, s1 closed 200 1000 ns driver disable time from low t dlz figures 4 and 6, c l = 15pf, s1 closed 60 200 ns driver disable time from high t dhz figures 4 and 6, c l = 15pf, s2 closed 80 200 ns receiver input to output t rplh , t rphl figures 7 and 9; | v id | 2.0v; rise and fall time of v id 4ns, c l = 15pf 47 80 ns differential receiver skew(t rplh - t rphl ) t rskd figures 7 and 9; | v id | 2.0v; rise and fall time of v id 4ns, c l = 15pf -10 -3 +10 ns receiver enable to output low t rzl figures 2 and 8, c l = 15pf, s1 closed 50 ns receiver enable to output high t rzh figures 2 and 8, c l = 15pf, s2 closed 50 ns receiver disable time from low t rlz figures 2 and 8, c l = 15pf, s1 closed 50 ns receiver disable time from high t rhz figures 2 and 8, c l = 15pf, s2 closed 50 ns time to shutdown t shdn (note 6) 50 180 600 ns driver enable from shutdown tooutput high t dzh ( shdn figures 4 and 6, c l = 100pf, s2 closed 1.5 ? driver enable from shutdown tooutput low t dzl ( shdn ) figures 4 and 6, c l = 100pf, s1 closed 1.5 ? receiver enable from shutdownto output high t rzh ( shdn ) figures 2 and 8, c l = 15pf, s2 closed 1.5 ? receiver enable from shutdownto output low t rzl ( shdn ) figures 2 and 8, c l = 15pf, s1 closed 1.5 ? downloaded from: http:///
max3060e/max3061e/max3062e 15kv esd-protected, fail-safe, 20mbps, slew-rate- limited rs-485/rs-422 transceivers in a sot 6 _______________________________________________________________________________________ switching characteristics?ax3062e(v cc = +5v ?%, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v and t a = +25?.) (notes 1, 2) note 1: overtemperature limits are guaranteed by design and are not production tested. devices are tested at t a = +25?. note 2: all currents into the device are positive; all currents out of the device are negative. all voltages are referred to deviceground, unless otherwise noted. note 3: v od and v oc are the changes in v od and v oc , respectively, when the di input changes state. note 4: this input current level is for the hot-swap enable (de, re ) inputs and is present until the first transition only. after the first transition, the input reverts to a standard high-impedance cmos input with input current i in1 . for the first 10?, the input current can be as high as 1ma. during this period the input is disabled. note 5: maximum current level applies to peak current just prior to foldback-current limiting; minimum current level applies duringcurrent limiting. note 6: the device is put into shutdown by bringing re high and de low. if the enable inputs are in this state for less than 50ns, the device is guaranteed not to enter shutdown. if the enable inputs are in this state for at least 600ns, the device is guaranteedto have entered shutdown. parameter symbol conditions min typ max units driver input to output t dplh , t dphl figures 3 and 5, r diff = 54 , c diff = 50pf 20 30 ns driver output skew(t dplh - t dphl ) t dskew figures 3 and 5, r diff = 54 , c diff = 50pf -10 +1 +10 ns driver rise or fall time t dr , t df figures 3 and 5, r diff = 54 , c diff = 50pf 81 5n s maximum data rate f max 20 mbps driver enable to output high t dzh figures 4 and 6, c l = 100pf, s2 closed 250 500 ns driver enable to output low t dzl figures 4 and 6, c l = 100pf, s1 closed 250 500 ns driver disable time from low t dlz figures 4 and 6, c l = 15pf, s1 closed 100 200 ns driver disable time from high t dhz figures 4 and 6, c l = 15pf, s2 closed 100 200 ns receiver input to output t rplh , t rphl figures 7 and 9; | v id | 2.0v; rise and fall time of v id 4ns, c l = 15pf 45 80 ns differential receiver skew(t rplh - t rphl ) t rskd figures 7 and 9; | v id | 2.0v; rise and fall time of v id 4ns, c l = 15pf -10 -4 +10 ns receiver enable to output low t rzl figures 2 and 8, c l = 15pf, s1 closed 50 ns receiver enable to output high t rzh figures 2 and 8, c l = 15pf, s2 closed 50 ns receiver disable time from low t rlz figures 2 and 8, c l = 15pf, s1 closed 50 ns recei ver d i sab l e ti m e fr om h i g ht rhz figures 2 and 8, c l = 15pf, s2 closed 50 ns time to shutdown t shdn (note 6) 50 180 600 ns driver enable from shutdown tooutput high t dzh ( shdn ) figures 4 and 6, c l = 100pf, s2 closed 100 ns driver enable from shutdown tooutput low t dzl ( shdn ) figures 4 and 6, c l = 100pf, s1 closed 100 ns receiver enable from shutdownto output high t rzh ( shdn ) figures 2 and 8, c l = 15pf, s2 closed 1.5 ? receiver enable from shutdownto output low t rzl ( shdn ) figures 2 and 8, c l = 15pf, s1 closed 1.5 ? downloaded from: http:///
max3060e/max3061e/max3062e 15kv esd-protected, fail-safe, 20mbps, slew-rate- limited rs-485/rs-422 transceivers in a sot rr ab v od2 v oc figure 1. driver dc test load receiver output test point 1k 1k s1 s2 v cc c l 15pf figure 2. receiver enable/disable timing test load di de 5v a b c diff r diff v od2 output under test 500 s1s2 v cc c l figure 3. driver timing test circuit figure 4. driver enable/disable timing test load di 5v 0 ba v o 0 -v o 1.5v t dplh 10% t dr 90% 90% t dphl 1.5v 10% t df v diff = v (a) - v (b) v diff t dskew = | t dplh - t dphl | output normally low output normally high 5v 0 a, b v ol a, b 0 1.5v 1.5v v ol + 0.5v v oh - 0.5v 2.3v 2.3v t dzl(shdn) , t dzl t dlz t dzh(shdn) , t dzh t dhz de figure 5. driver propagation delays figure 6. driver enable and disable times _______________________________________________________________________________________ 7 downloaded from: http:///
max3060e/max3061e/max3062e 15kv esd-protected, fail-safe, 20mbps, slew-rate- limited rs-485/rs-422 transceivers in a sot 8 _______________________________________________________________________________________ no-load supply current vs. temperature max3060e toc01 temperature ( c) no-load supply current ( a) 60 35 10 -15 700 750 800 850 900 950650 -40 85 de = re = v cc de = re = gnd receiver output current vs. receiver output low voltage max3060e toc02 output low voltage (v) output current (ma) 4 3 2 1 10 20 30 40 50 60 0 05 receiver output current vs. receiver output high voltage max3060e toc03 output high voltage (v) output current (ma) 4 3 2 1 2 4 6 8 10 12 14 16 18 20 0 05 typical operating characteristics (v cc = +5v, t a = +25?, unless otherwise noted.) v oh v ol ab 1v -1v 1.5v 1.5v output input ro t rplh t rphl output normally low output normally high 5v 0 v cc roro 0 1.5v 1.5v v ol + 0.5v v oh - 0.5v 1.5v 1.5v t rzl(shdn) , t rzl t rlz t rzh(shdn) , t rzh t rhz re figure 7. receiver propagation delays figure 8. receiver enable and disable times r b receiveroutput ate a v id r figure 9. receiver propagation delay test circuit downloaded from: http:///
max3060e/max3061e/max3062e 15kv esd-protected, fail-safe, 20mbps, slew-rate- limited rs-485/rs-422 transceivers in a sot _______________________________________________________________________________________ 9 max3060e/max3061e/max3062e typical operating characteristics (continued) (v cc = +5v, t a = +25?, unless otherwise noted.) shutdown current vs. temperature max3060e toc04 temperature ( c) shutdown current (na) 60 35 10 -15 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 0 -40 85 receiver output low voltage vs. temperature max3060e toc05 temperature ( c) output low voltage (v) 60 35 -15 10 0.15 0.20 0.25 0.30 0.35 0.40 0.45 0.500.10 -40 85 i ro = 8ma receiver output high voltage vs. temperature max3060e toc06 temperature ( c) output high voltage (v) 60 35 10 -15 3.4 3.6 3.8 4.0 4.23.2 -40 85 i ro = -8ma receiver propagation delay (max3060e/max3061e) vs. temperature max3060e toc07 temperature ( c) propagation dealy (ns) 60 35 10 -15 25 30 35 40 45 50 55 60 65 7020 -40 85 c l = 15pf driver propagation delay (max3060e) vs. temperature max3060e toc09 temperature ( c) propagation dealy ( s) 60 35 10 -15 1.62 1.64 1.66 1.68 1.70 1.72 1.74 1.76 1.78 1.801.60 -40 85 r t = 54 driver propagation delay (max3061e) vs. temperature max3060e toc10 temperature ( c) propagation delay (ns) 60 35 10 -15 420 440 460 480 500 520 540400 -40 85 r t = 54 driver propagation delay (max3062e) vs. temperature max3060e toc11 temperature ( c) propagation delay (ns) 60 35 10 -15 5 10 15 20 25 30 0 -40 85 r t = 54 driver differential output voltage vs. temperature max3060e toc12 temperature ( c) output voltage (v) 60 35 10 -15 2.2 2.4 2.6 2.8 3.0 3.2 3.42.0 -40 85 r t = 54 receiver propagation delay (max3062e) vs. temperature max3060e toc08 temperature ( c) propagation dealy (ns) 60 35 10 -15 25 30 35 40 45 50 55 60 65 7020 -40 85 c l = 15pf downloaded from: http:///
max3060e/max3061e/max3062e 15kv esd-protected, fail-safe, 20mbps, slew-rate- limited rs-485/rs-422 transceivers in a sot 10 ______________________________________________________________________________________ typical operating characteristics (continued) (v cc = +5v, t a = +25?, unless otherwise noted.) driver output current vs. differential output voltage max3060e toc13 differential output voltage (v) output current (ma) 5 4 3 2 1 0.1 1 10 100 0.01 06 0 2010 5040 30 8070 60 90 04 26 8 1 0 1 2 driver output current vs. output low voltage max3060e toc14 output low voltage (v) driver output current (ma) driver output current vs. output high voltage max3060e toc15 output high voltage (v) driver output current (ma) 4 2 0 -2 -4 -6 20 40 60 80 100 120 0 -8 6 max3060e toc16 receiver propagation delay (max3060e/max3061e) 20ns/div v a - v b 1v/divro 5v/div max3060e toc18 driver propagation delay (max3061e) 1 s/div v a - v b 2v/div di5v/div max3060e toc19 driver propagation delay (max3060e) 2 s/div v a - v b 2v/div di5v/div max3060e toc20 driver propagation delay (max3061e) 10ns/div v a - v b 2v/div di5v/div max3060e toc17 receiver propagation delay (max3062e) 20ns/div v a - v b 1v/divro 5v/div max3060e toc21 driver propagation delay (max3062e) 20ns/div downloaded from: http:///
max3060e/max3061e/max3062e 15kv esd-protected, fail-safe, 20mbps, slew-rate- limited rs-485/rs-422 transceivers in a sot ______________________________________________________________________________________ 11 max3060e/max3061e/max3062e detailed description the max3060e/max3061e/max3062e high-speed trans- ceivers for rs-485/rs-422 communication contain one driver and one receiver. these devices feature fail-safe circuitry, which guarantees a logic-high receiver output when the 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). all devices have a hot-swap input structure that prevents distur- bances on the differential signal lines when a circuit board is plugged into a hot backplane (see the hot-swap capability section). the max3060e features a reduced slew-rate driver that minimizes emi and reduces reflec- tions caused by improperly terminated cables, allowing error-free data transmission up to 115kbps (see the reduced emi and reflections section). the max3061e is also slew-rate limited, transmitting up to 500kbps. the max3062e driver is not slew-rate limited, allowing trans- mit speeds up to 20mbps. the max3060e/max3061e/ max3062e are half-duplex transceivers. all of these parts operate from a single +5v supply. drivers are output short-circuit current limited. thermal- shutdown circuitry protects drivers against excessive power dissipation. when activated, the thermal-shut- down circuitry places the driver outputs into a high- impedance state. receiver input filtering the receivers of the max3060e and max3061e incorpo- rate input filtering in addition to input hysteresis. this fil- tering enhances noise immunity with differential signals that have very slow rise and fall times. receiver propa- gation delay increases by 2ns due to this filtering. fail-safe the max3060e family of devices guarantee a logic-highreceiver output when the receiver inputs are shorted or open, or when they are connected to a terminated trans- mission line with all drivers disabled. this is done by set- ting the receiver threshold between -50mv and -200mv. if the differential receiver input voltage (a - b) is greater than or equal to -50mv, ro is logic high. if a - b is less than or equal to -200mv, ro is logic low. in the case of a terminated bus with all transmitters dis- abled, the receiver? differential input voltage is pulled to 0v by the termination. in the case of an unterminated bus with all transmitters disabled, the receiver? differential input voltage is pulled to 0v by the receiver? input resis- tors. with the receiver thresholds of the max3060e fami- ly, this results in a logic high output with a 50mv minimum input noise margin. unlike previous fail-safe devices, the -50mv to -200mv threshold complies with the ?00mv eia/tia-485 standard. pin name function 1r o receiver output. when re is low and when a - b -50mv, ro is high; if a - b -200mv, ro is low. ro is high impedance when re is high. 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 and reverts to a standard cmos input after the first low transition. 3d e driver output enable. drive de high to enable driver outputs. driver outputs are high impedance whende is low. drive re high and de low to enter low-power shutdown mode. de is a hot-swap input and reverts to a standard cmos input after the first high transition. 4d i driver input. with de high, a low on di forces the noninverting output low and the inverting output high. similarly, a high on di forces the noninverting output high and the inverting output low. 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. bypass with a 0.1? capacitor to gnd. pin description downloaded from: http:///
max3060e/max3061e/max3062e 15kv esd-protected, fail-safe, 20mbps, slew-rate- limited rs-485/rs-422 transceivers in a sot 12 ______________________________________________________________________________________ hot-swap capability hot-swap input when circuit boards are inserted into a hot or poweredbackplane, differential disturbances to the data bus can lead to data errors. upon initial circuit board insertion, the data communication processor undergoes its own power- up sequence. during this period, the processor? logic- output drivers are high impedance and are unable to drive the de and re inputs of the max306_e to a defined logic level. leakage currents up to 10? from the high- impedance state of the processor? logic drivers couldcause standard cmos enable inputs of a transceiver to drift to an incorrect logic level. additionally, parasitic cir- cuit board capacitance could cause coupling of v cc or gnd to the enable inputs. without the hot-swap capabili- ty, these factors could improperly enable the transceiver? driver or receiver. when v cc rises, an internal pulldown circuit holds de low for at least 10? and until the current into de exceeds 200?. after the initial positive transition, the pulldown circuit becomes transparent, resetting the hot-swap tolerable input. hot-swap input circuitry these devices enable inputs feature hot-swap capabili- ty. at the input there are two nmos devices, m1 and m2(figure 10). when v cc ramps from zero, an internal 10? timer turns on m2 and sets the sr latch, which also turnson m1. transistors m2, a 300? current sink, and m1, a 30? current sink, pull de to gnd through an 8k resis- tor. m2 is designed to pull de to the disabled stateagainst an external parasitic capacitance up to 100pf that can drive de high. after 10?, the timer deactivates m2 while m1 remains on, holding de low against three- state leakages that can drive de high. m1 remains on until an external source overcomes the required inputcurrent. 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 . functional tables table 1. transmitter functional table table 2. receiver functional table x = don? care. * shutdown mode, driver and receiver outputs are high impedance. transmitting inputs outputs re de di b a x1101 x1010 0 0 x high-z high-z 1 0 x shutdown* receiving inputs output re de a-b ro 0x -0.05v 1 0x -0.2v 0 0 x open/shorted 1 1 1 x high-z 1 0 x shutdown v cc timer timer de de (hot swap) 10 s 30 a m1 m2 8k 300 a sr latch figure 10. simplified structure of the driver enable input (de) downloaded from: http:///
hot-swap line transient the circuit of figure 11 shows a typical offset termina-tion used to guarantee a greater than 200mv offset when a line is not driven (the 50pf represents the mini- mum parasitic capacitance that would exist in a typical application). during a hot-swap event when the driver is connected to the line and is powered up, the driver must not cause the differential signal to drop below 200mv. figures 12, 13, and 14 show the results of the max3060e during power-up for three different v cc ramp rates (0.1v/?, 1v/?, and 10v/?). the photosshow the v cc ramp, the single-ended signal on each side of the 100 termination, as well as the differential signal across the termination. 15kv esd protection as with all maxim devices, esd-protection structuresare incorporated on all pins to protect against esd encountered during handling and assembly. the max3060e family? receiver inputs/driver outputs (a, b) have extra protection against static electricity found in normal operation. maxim? engineers developed state- of-the-art structures to protect these pins against ?5kv esd without damage. after an esd event, the devices continue working without latchup. esd protection can be tested in several ways. the receiver inputs are characterized for protection to the following: 15kv using the human body model 7kv using the contact discharge method specified in iec 1000-4-2 (formerly iec 801-2) 7kv using the air-gap discharge method specified in iec 1000-4-2 (formerly iec 801-2) max3060e/max3061e/max3062e 15kv esd-protected, fail-safe, 20mbps, slew-rate- limited rs-485/rs-422 transceivers in a sot ______________________________________________________________________________________ 13 max3060e/max3061e/max3062e di 5.0v v cc 0.1k 1k 1k v cc or gnd ab 50pf figure 11. typical offset termination 40 s/div 5v 238mv20mv/div 200mv/div 0200mv/div b v cc a a - b figure 12. differential power-up glitch (0.1v/?) 2 s/div b v cc 238mv20mv/div 5v a a - b 20mv/div 20mv/div 0 figure 13. differential power-up glitch (1v/?) 200ns/div b v cc 238mv20mv/div 5v a a - b 50mv/div 50mv/div 0 figure 14. differential power-up glitch (10v/?) downloaded from: http:///
max3060e/max3061e/max3062e 15kv esd-protected, fail-safe, 20mbps, slew-rate- limited rs-485/rs-422 transceivers in a sot 14 ______________________________________________________________________________________ esd test conditions esd performance depends on a number of conditions.contact maxim for a reliability report that documents test setup, methodology, and results. human body model figure 15a shows the human body model, and figure15b 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 device through a 1.5k resistor. iec 1000-4-2 the iec 1000-4-2 standard covers esd testing and per- formance of finished equipment; it does not specifically refer to integrated circuits. the main difference between tests done using the human body model and iec 1000-4-2 is higher peak current in iec 1000-4-2. because series resistance is lower in the iec 1000-4-2 esd test model (figure 16), the esd withstand voltage measured to this standard is gen- erally lower than that measured using the human body model. 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. machine model the machine model for esd testing uses a 200pf stor-age capacitor and zero-discharge resistance. it mimics the stress caused by handling during manufacturing and assembly. all pins (not just rs-485 inputs) require this protection during manufacturing. therefore, the machine model is less relevant to the i/o ports than are the human body model and iec 1000-4-2. applications information 256 transceivers on the bus the standard rs-485 receiver input impedance is 12k (one-unit load), and the standard driver can drive up to32-unit loads. the max3060e family of transceivers have a 1/8-unit-load receiver input impedance (96k ), allow- ing up to 256 transceivers to be connected in parallel onone communication line. any combination of these devices and/or other rs-485 transceivers with a total of 32 unit loads or less can be connected to the line. reduced emi and reflections the max3060e and max3061e are slew-rate limited, minimizing emi and reducing reflections caused byimproperly terminated cables. figure 17 shows the dri- ver output waveform and its fourier analysis of a 25khz signal transmitted by a max3062e. high-frequencyharmonic components with large amplitudes are evi- dent. figure 18 shows the same signal displayed for amax3061e transmitting under the same conditions. charge-current limit resistor discharge resistance storagecapacitor c s 100pf r c 1m r d 1.5k high- voltage dc source device under test figure 15a. 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 amperes figure 15b. human body 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 figure 16. iec 1000-4-2 esd test model downloaded from: http:///
figure 18? high-frequency harmonic components aremuch lower in amplitude, compared with figure 17?, and the potential for emi is significantly reduced. figure 19 shows the same signal displayed for a max3060e transmitting under the same conditions. figure 19? high-frequency harmonic components are even lower. in general, a transmitter? rise time relates directly to the length of an unterminated stub, which can be driven with only minor waveform reflections. the following equationexpresses this relationship conservatively: length = t rise / (10 x 1.5ns/ft) where t rise is the transmitter? rise time. for example, the max3060e? rise time is typically1850ns, which results in excellent waveforms with a stub length up to 123ft. a system can work well with longer unterminated stubs, even with severe reflections, if the waveform settles out before the uart samples them. low-power shutdown mode low-power shutdown mode is initiated by bringing bothre high and de low. in shutdown, the devices typically draw only 1na of supply current.re and de can be driven simultaneously. the parts 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 atleast 600ns, the parts are guaranteed to enter shutdown. enable times t_ zh and t_ zl in the switching char- acteristics tables assume the part was not in a low- power shutdown state. enable times t_ zh(shdn) and t_ zl(shdn) assume the parts were shut down. it takes drivers and receivers longer to become enabled fromlow-power shutdown mode (t_ zh(shdn) , t_ zl(shdn) ) than from driver/receiver-disable mode (t_ zh , t_ zl ). driver output protection two mechanisms prevent excessive output current and power dissipation caused by faults or by bus con- tention. the first, a foldback current limit on the output stage, provides protection after a 20? delay against short circuits over the whole common-mode voltage range (see typical operating characteristics ). the sec- ond, a thermal shutdown circuit, forces the driver out-puts into a high-impedance state if the die temperature becomes excessive. max3060e/max3061e/max3062e 15kv esd-protected, fail-safe, 20mbps, slew-rate- limited rs-485/rs-422 transceivers in a sot ______________________________________________________________________________________ 15 max3060e/max3061e/max3062e 125khz/div 20db/div 0 1.25mhz figure 17. driver output waveform and fft plot of max3062etransmitting a 25khz signal 125khz/div 20db/div 0 1.25mhz figure 18. driver output waveform and fft plot of max3061etransmitting a 25khz signal 125khz/div 20db/div 0 1.25mhz figure 19. driver output waveform and fft plot of max3060etransmitting a 25khz signal downloaded from: http:///
typical applications the max3060e family of transceivers are designed forbidirectional data communications on multipoint bus transmission lines. figure 20 shows a typical network application circuit. to minimize reflections, the line should be terminated at both ends in its characteristic impedance, and stub lengths off the main line should be kept as short as possible. the slew-rate-limited max3060e and max3061e are more tolerant of imperfect termination. chip information process: cmos max3060e/max3061e/max3062e 15kv esd-protected, fail-safe, 20mbps, slew-rate- limited rs-485/rs-422 transceivers in a sot 16 ______________________________________________________________________________________ di ro de re a b re re re ro ro ro di di di de de de d d d r r r b b b a a a 120 120 d r max3060e/max3061e/ max3062e (half-duplex) figure 20. typical half-duplex rs-485 network downloaded from: http:///
15kv esd-protected, fail-safe, 20mbps, slew-rate- limited rs-485/rs-422 transceivers in a sot max3060e/max3061e/max3062e maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a maxim product. no circuit patent licenses are implied. maxim reserves the right to change the circuitry and specifications without notice at any time. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ____________________ 17 2007 maxim integrated products is a registered trademark of maxim integrated products, inc. max3060e/max3061e/max3062e max3060e/max3061e/max3062e 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 .) sot23, 8l.eps 0 0 package outline, sot-23, 8l body 21-0078 g 1 1 marking revision history pages changed at rev 1: 1, 16, 17 downloaded from: http:///

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