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general description the max3535e/mxl1535e isolated rs-485/rs-422 full- duplex transceivers provide 2500v rms of galvanic isola- tion between the rs-485/rs-422 side and the processor or control logic side. these devices allow fast, 1000kbps communication across an isolation barrier when the common-mode voltages (i.e., the ground potentials) on either side of the barrier are subject to large differences. isolation is achieved through integrat- ed high-voltage capacitors. the max3535e/mxl1535e also feature a 420khz transformer driver that allows power transfer to the rs-485 side using an external transformer. the max3535e/mxl1535e include one differential driver, one receiver, and internal circuitry to send the rs-485 signals and control signals across the isolation barrier (including the isolation capacitors). the max3535e/ mxl1535e rs-485 receivers are 1/8 unit load, allowing up to 256 devices on the same bus. the max3535e/mxl1535e feature true fail-safe circuitry. the driver outputs and the receiver inputs are protected from ?5kv electrostatic discharge (esd) on the inter- face side, as specified in the human body model (hbm). the max3535e/mxl1535e feature driver slew-rate select that minimizes electromagnetic interference (emi) and reduces reflections. the driver outputs are short-cir- cuit and overvoltage protected. other features are hot- swap capability and isolation-barrier fault detection. the max3535e operates with a single +3v to +5.5v power supply. the improved secondary supply range of the max3535e allows the use of step-down transformers for +5v operation, resulting in considerable power sav- ings. the mxl1535e operates with a single +4.5v to +5.5v power supply. the mxl1535e is a function-/pin- compatible improvement of the ltc1535. the max3535e/mxl1535e are available over the commer- cial 0? to +70? and extended -40? to +85? temper- ature ranges. applications isolated rs-485 systems systems with large common-mode voltages industrial-control local area networks telecommunications systems features ? 2500v rms rs-485 bus isolation using on-chip high-voltage capacitors ? 1000kbps full-duplex rs-485/rs-422 communication ? +3v to +5.5v power-supply voltage range (max3535e) ? +4.5v to +5.5v power-supply voltage range (mxl1535e) ? 1/8 unit receiver load, allowing 256 devices on bus ? 15kv esd protection using hbm ? pin-selectable slew-rate limiting controls emi ? hot-swap-protected driver-enable input ? undervoltage lockout ? isolation-barrier fault detection ? short-circuit protected ? thermal shutdown ? open-line and shorted-line fail-safe receiver inputs max3535e/mxl1535e +3v to +5v, 2500v rms isolated rs-485/rs-422 transceivers with 15kv esd protection ________________________________________________________________ maxim integrated products 1 28 27 26 25 18 17 16 15 1 2 3 4 11 12 13 14 ro1 re de di b slo ro2 a v cc2 pins 5?10 and 19?24 are removed from the package y z gnd2 gnd1 st2 st1 v cc1 wide so top view max3535e mxl1535e part temp range pin- package power- supply range (v) max3535e cwi 0? to +70? 28 wi d e s o + 3.0 to + 5.5 max3535eewi -40c to +85c 28 wi d e s o + 3.0 to + 5.5 mxl1535e cwi 0? to +70? 28 wi d e s o + 4.5 to + 5.5 mxl1535eewi -40c to +85c 28 wi d e s o+ 4.5 to + 5.5 pin configuration ordering information 19-3270; rev 0; 4/04 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. typical application circuit appears at end of data sheet. evaluation kit available
max3535e/mxl1535e +3v to +5v, 2500v rms isolated rs-485/rs-422 transceivers with 15kv esd protection 2 _______________________________________________________________________________________ absolute maximum ratings dc electrical characteristics table (max3535e) (v cc1 = +3.0v to +5.5v, v cc2 = +3.13v to +7.5v, t a = -40? to +85?, unless otherwise noted. typical values are at v cc1 = +3.3v, v cc2 = +5v, t a = +25?.) 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. logic side?ll voltages referenced to gnd1. v cc1 .........................................................................-0.3v to +6v re , de, di.................................................................-0.3v to +6v ro1, st1, st2 ..........................................-0.3v to (v cc1 + 0.3v) isolated side?ll voltages referenced to gnd2. v cc2 .........................................................................-0.3v to +8v slo ...........................................................-0.3v to (v cc2 + 0.3v) a, b ......................................................................................?4v ro2 .....................-0.3v to the lower of (v cc2 + 0.3v) and +3.4v y, z ............................................................................-8v to +13v digital outputs maximum current ro1, ro2 .....................................................................?0ma y, z maximum current .............................short-circuit protected st1, st2 maximum current............................................?00ma continuous power dissipation (t a = +70?) 28-pin wide so (derate 9.5mw/? above +70?) .................................750mw operating temperature range mxl1535ecwi, max3535ecwi .........................0? to +70? mxl1535eewi, max3535eewi .......................-40? to +85? junction temperature ......................................................+150? storage temperature range .............................-65? to +150? lead temperature (soldering, 10s) .................................+300? parameter symbol conditions min typ max units logic-side supply (v cc1 , gnd1) logic-side supply voltage v cc1 3.0 5.5 v logic-side supply current i cc1 transformer not driven, st1 and st2 unconnected, re = low, de = high, f data = 0, ro1 = no load 5.9 13 ma v cc1 undervoltage-lockout falling trip v uvl1 2.53 2.69 2.85 v v cc1 undervoltage-lockout rising trip v uvh1 2.63 2.80 2.97 v logic inputs (di, de, re ) input high voltage, de, di, re v ih v ih is measured with respect to gnd1 2.0 v input low voltage, de, di, re v il v il is measured with respect to gnd1 0.8 v logic-side input current, de, di i inc 2a logic outputs (ro1, re ) i source = 4ma, v cc1 = +4.5v 3.7 receiver-output high voltage (ro1) v ro1h i source = 4ma, v cc1 = +3v 2.4 v i sink = 4ma, v cc1 = +4.5v 0.4 receiver-output low voltage (ro1) v ro1l i sink = 4ma, v cc1 = +3v 0.4 v receiver-output (ro1) leakage current i ozr re = high, v cc1 = +5.5v, 0 v ro1 v cc1 ? ? re low output current for fault detect i ol re = +0.4v, fault not asserted 40 60 80 ?
+3v to +5v, 2500v rms isolated rs-485/rs-422 transceivers with 15kv esd protection _______________________________________________________________________________________ 3 max3535e/mxl1535e dc electrical characteristics table (max3535e) (continued) (v cc1 = +3.0v to +5.5v, v cc2 = +3.13v to +7.5v, t a = -40? to +85?, unless otherwise noted. typical values are at v cc1 = +3.3v, v cc2 = +5v, t a = +25?.) parameter symbol conditions min typ max units re high output current for fault detect i oh re = v cc1 - 0.5v, fault asserted -140 -100 -60 ? transformer driver (st1, st2) dc-converter switching frequency (st1, st2) f sw st1, st2, not loaded 290 460 590 khz v cc1 = +4.5v, figure 13 1.6 2.6 dc-converter total impedance r oh + r ol (st1, st2) r ohl v cc1 = +3v, figure 13 1.8 2.9 st1, st2 duty cycle st1, st2, not loaded 44 50 56 % isolated-side supply (v cc2 , gnd2) isolated-side supply voltage v cc2 3.13 7.50 v r l = 27 56 70 isolated-side supply current i cc2 f data = 0, slo floating, ro2 = no load, a, b floating, figure 1 r l = 10 16 ma v cc2 undervoltage-lockout falling trip v uvl2 2.68 2.85 3.02 v v cc2 undervoltage-lockout rising trip v uvh2 2.77 2.95 3.13 v driver outputs (y, z) driver-output high voltage v doh no load, v doh is measured with respect to gnd2 4v r l = 50 (rs-422), v cc2 = +3.13v, figure 1 2.0 2.35 differential driver output v od r l = 27 (rs-485), v cc2 = +3.13v, figure 1 1.5 1.95 v driver common-mode output voltage v oc r l = 27 or 50 , v oc is measured with respect to gnd2, figure 1 1.0 3.0 v change in magnitude of driver differential output voltage for complementary output states v od r l = 27 or 50 , figure 1 0.2 v change in magnitude of driver common-mode output voltage for complementary output states v oc r l = 27 or 50 , figure 1 0.2 v driver enabled (de =1 ) di = high, v y > -7v di = low, v z > -7v -250 driver short-circuit output current i osd driver enabled (de =1 ) di = high, v z < +12v di = low, v y < +12v +250 ma
max3535e/mxl1535e +3v to +5v, 2500v rms isolated rs-485/rs-422 transceivers with 15kv esd protection 4 _______________________________________________________________________________________ dc electrical characteristics table (max3535e) (continued) (v cc1 = +3.0v to +5.5v, v cc2 = +3.13v to +7.5v, t a = -40? to +85?, unless otherwise noted. typical values are at t a = +25?, v cc1 = +3.3v, v cc2 = +5v). parameter symbol conditions min typ max units di = high -7v < v y < min[(v cc2 - 1v) +2v] di = low -7v < v z < min[(v cc2 - 1v) +2v] -25 di = high +1v < v z < +12v driver short-circuit foldback output current i osfd driver enabled (de =1) di = low +1v < v y < +12v +25 ? slew-rate select ( slo ) input high voltage slo v ihs v ihs is measured with respect to gnd2 3.0 v input low voltage slo v ils v ils is measured with respect to gnd2 1.0 v slo pullup resistor r slo v slo = +3v 100 k receiver inputs (a, b) v a or v b = +12v +125 receiver input current i ab v a or v b = -7v -100 ? receiver differential threshold voltage v th -7v v cm +12v -200 -90 -10 mv -7v v cm +12v, t a = 0 c to +70 c103070 receiver-input hysteresis v th -7v v cm +12v, t a = -40 c to +85 c 5 30 70 mv receiver-input resistance r in -7v v cm +12v (note 1) 96 200 k receiver-input open circuit voltage v oab 2.6 v receiver output (ro2) receiver-output (ro2) high voltage v ro2h i source = 4ma, v cc2 = +3.13v 2.4 v receiver-output (ro2) low voltage v ro2l i sink = 4ma, v cc2 = +3.13v 0.4 v isolation 60s 2500 isolation voltage (notes 2, 3) v iso 1s 3000 v rms isolation resistance r iso t a = +25 c, v iso = 50v (note 3) 100 10,000 m isolation capacitance c iso t a = +25 c2pf esd protection human body model (a, b, y, z) ?5 kv
+3v to +5v, 2500v rms isolated rs-485/rs-422 transceivers with 15kv esd protection _______________________________________________________________________________________ 5 max3535e/mxl1535e switching electrical characteristics (max3535e) (v cc1 = +3.0v to +5.5v, v cc2 = +3.13v to +7.5v, r l = 27 , c l = 50pf, t a = -40? to +85?, unless otherwise noted. typical values are at v cc1 = +3.3v, v cc2 = +5v, t a = +25?.) parameter symbol conditions min typ max units data sample jitter t j figure 6 220 285 ns maximum data rate f data t j = 25% of data cell, receiver and driver, slo = high (note 4) 877 1136 kbps slo = high, figure 5 250 450 self-oscillating frequency f sos slo = low, figure 5 200 375 khz slo = high, figures 2, 6 490 855 driver-differential output delay time t dd slo = low, figures 2, 6 850 1560 ns slo = high, figures 2, 6 30 100 driver-differential output transition time t td slo = low, figures 2, 6 120 220 1000 ns driver-output enable time t pzl , t pzh slo = high, di = high or low, figures 3, 7 730 1400 ns driver-output disable time t phz , t plz slo = high, di = high or low, figures 3, 7 720 1300 ns receiver-propagation delay time to ro1 t plh1 , t phl1 figures 4, 8 440 855 ns receiver-propagation delay time to ro2 t plh2 , t phl2 figures 4, 8 40 ns ro1, ro2 rise or fall time t r , t f figures 4, 8 40 ns receiver-output enable time ro1 t zl ,t zh figures 4, 9 30 ns receiver-output disable time ro1 t lz ,t hz figures 4, 9 30 ns initial startup time (from internal communication fault) (note 5) 1200 ns internal communication timeout fault time (note 5) 1200 ns
max3535e/mxl1535e +3v to +5v, 2500v rms isolated rs-485/rs-422 transceivers with 15kv esd protection 6 _______________________________________________________________________________________ electrical characteristics (mxl1535e) (v cc1 = +4.5v to +5.5v, v cc2 = +4.5v to +7.5v, t a = -40? to +85?, unless otherwise noted. typical values are at v cc1 = +5v, v cc2 = +5v, t a = +25?.) parameter symbol conditions min typ max units logic-side supply voltage v cc1 4.5 5.5 v isolated-side supply voltage v cc2 4.5 7.5 v logic-side supply current i cc1 transformer not driven, st1 and st2 unconnected, re = low, de = high, f data = 0, ro1 = no load 5.9 13 ma r l = 27 56 70 isolated-side supply current i cc2 f data = 0, slo floating, ro2 = no load, a, b floating, figure 1 r l = 10 16 ma r l = 50 (rs-422), v cc2 = +4.5v, figure 1 2.0 3.0 differential driver output v od r l = 27 (rs-485), v cc2 = +4.5v, figure 1 1.5 2.5 v driver output high voltage v doh no load, v doh is measured with respect to gnd2 5.0 v driver common-mode output voltage v oc r l = 27 or 50 , v oc is measured with respect to gnd2, figure 1 1.0 3.0 v change in magnitude of driver differential output voltage for complementary output states v od r l = 27 or 50 , figure 1 0.2 v change in magnitude of driver common-mode output voltage for complementary output states v oc r l = 27 or 50 , figure 1 0.2 v driver enabled (de =1) di = high, v y > -7v di = low, v z > -7v -250 driver short-circuit output current i osd driver enabled (de =1) di = high, v z < +12v di = low, v y < + 12v +250 ma driver enabled (de =1) di = high -7v < v y < min[(v cc2 - 1v) +2v] di = low -7v < v z < min[(v cc2 - 1v) +2v] -25 driver short-circuit foldback output current i osfd driver enabled (de =1) di = high +1v < v z < +12v di = low +1v < v y < +12v +25 ma
+3v to +5v, 2500v rms isolated rs-485/rs-422 transceivers with 15kv esd protection _______________________________________________________________________________________ 7 max3535e/mxl1535e electrical characteristics (mxl1535e) (continued) (v cc1 = +4.5v to +5.5v, v cc2 = +4.5v to +7.5v, t a = -40? to +85?, unless otherwise noted. typical values are at v cc1 = +5v, v cc2 = +5v, t a = +25?.) parameter symbol conditions min typ max units input high voltage, de, di, re v ih v ih is measured with respect to gnd1 2.0 1.45 v input high voltage, slo v ihs v ihs is measured with respect to gnd2 4.0 2.1 v input low voltage, de, di, re v il v il is measured with respect to gnd1 1.45 0.8 v input low voltage, slo v ils v ils is measured with respect to gnd2 2.1 1.0 v logic-side input current, de, di i inc 2a v a or v b = +12v +0.25 receiver input current i ab v a or v b = -7v -0.20 ma receiver differential threshold voltage v th -7v v cm +12v -200 -90 -10 mv -7v v cm +12v, t a = 0? to +70? 10 30 70 receiver-input hysteresis v th -7v v cm +12v, t a = -40? to +85? 5 30 70 mv receiver-input resistance r in -7v v cm +12v (note 1) 96 140 200 k receiver-input open-circuit voltage v oab 2.6 v receiver-output high voltage (ro1) v ro1h i source = 4ma, v cc1 = +4.5v 3.7 4.3 v receiver-output low voltage (ro1) v ro1l i sink = 4ma, v cc1 = +4.5v 0.4 0.8 v driver-output leakage current i oz de = low -7v < v y < +12v, -7v < v z < +12v ?0 ? driver-output leakage current i oz de = low -7v < v y < +12v, -7v < v z < +12v 30 100 ? receiver-output (ro2) high voltage v ro2h i source = 4ma, v cc2 = +4.5v 2.8 3.4 v receiver-output (ro2) low voltage v ro2l i sink = 4ma, v cc2 = +4.5v 0.4 0.8 v dc-converter switching frequency (st1, st2) f sw st1, st2 not loaded 290 460 590 khz
max3535e/mxl1535e +3v to +5v, 2500v rms isolated rs-485/rs-422 transceivers with 15kv esd protection 8 _______________________________________________________________________________________ electrical characteristics (mxl1535e) (continued) (v cc1 = +4.5v to +5.5v, v cc2 = +4.5v to +7.5v, t a = -40? to +85?, unless otherwise noted. typical values are at v cc1 = +5v, v cc2 = +5v, t a = +25?.) parameter symbol conditions min typ max units dc-converter impedance high st1, st2 r oh figure 13 4 6 dc-converter impedance low st1, st2 r ol figure 13 2.5 5 re low output current for fault detect i ol re = sink current, re = +0.4v, fault not asserted -40 -50 -80 ? re high output current for fault detect i oh re = source current, re = +v cc1 - 0.5v, fault asserted 60 100 140 ? v cc2 undervoltage-lockout falling trip v uvl2 2.68 2.85 3.02 v v cc2 undervoltage-lockout rising trip v uvh2 2.77 2.95 3.13 v v cc1 undervoltage-lockout falling trip v uvl1 2.53 2.69 2.85 v v cc1 undervoltage-lockout rising trip v uvh1 2.63 2.80 2.97 v 60s 2500 isolation voltage (note 2) v iso 1s 3000 v rms slo pullup resistor r slo v slo = +3v 100 k
max3535e/mxl1535e +3v to +5v, 2500v rms isolated rs-485/rs-422 transceivers with 15kv esd protection _______________________________________________________________________________________ 9 max3535e/mxl1535e switching electrical characteristics (mxl1535e) (v cc1 = +4.5v to +5.5v, v cc2 = +4.5v to +7.5v, r l = 27 , c l = 50pf, t a = -40? to +85?, unless otherwise noted. typical values are at v cc1 = +5v, v cc2 = +5v, t a = +25?.) parameter symbol conditions min typ max units data sample jitter t j figure 6 220 285 ns max baud rate f max slo = high, figure 5, (note 6) 250 450 kbd slo = high, figures 2, 6 430 855 driver-differential output delay time t dd slo = low, figures 2, 6 850 1560 ns slo = high, v cc2 = +4.5v 45 100 driver-differential output transition time t td slo = low, v cc2 = +4.5v 150 260 1000 ns driver-output enable time t pzl , t pzh slo = high, di = high or low, figure 3, 7 730 1400 ns driver-output disable time t phz , t plz slo = high, di = high or low, figures 3, 7 720 1300 ns receiver-propagation delay time to ro1 t plh1 , t phl1 figures 4, 8 440 855 ns receiver-propagation delay time to ro2 t plh2 , t phl2 figures 4, 8 40 ns ro1, ro2 rise or fall time t r , t f figures 4, 8 40 ns receiver-output enable time ro1 t zl , t zh figures 4, 9 30 ns receiver-output disable time ro1 t lz , t hz figures 4, 9 30 ns initial startup time (from internal communication fault) (note 5) 1200 ns internal communication timeout fault time (note 5) 1200 ns 0? to +70? 56 st1, st2 duty cycle -40? to +85? 57 % esd protection human body model (a, b, y, z) ?5 kv note 1: receiver inputs are 96k minimum resistance, which is 1/8 unit load. note 2: 60s test result is guaranteed by correlation from 1s result. note 3: v iso is the voltage difference between gnd1 and gnd2. note 4: the maximum data rate is specified using the maximum jitter value according to the formula: data rate = 1 / (4t j ). see the skew section for more information. note 5: initial startup time is the time for communication to recover after a fault condition. internal communication timeout fault tim e is the time before a fault is indicated on re , after internal communication has stopped. note 6: bd = 2 bits.
max3535e/mxl1535e +3v to +5v, 2500v rms isolated rs-485/rs-422 transceivers with 15kv esd protection 10 ______________________________________________________________________________________ typical operating characteristics (v cc1 = +5v, c l = 50pf (figure 1), unless otherwise noted.) i cc1 supply current vs. temperature max3535e toc01 temperature ( c) i cc1 (ma) 60 35 10 -15 20 40 60 80 100 0 -40 85 figure 1 r l = 27 r l = 60 r l = open halo tgm-250ns 1:1:1 transformer i cc1 supply current vs. temperature max3535e toc02 temperature ( c) i cc1 (ma) 60 35 10 -15 20 40 60 80 100 0 -40 85 figure 1 v cc1 = +3.3v r l = 60 r l = open halo tgm-240ns 1:1.3:1.3 transformer r l = 27 i cc2 supply current vs. temperature max3535e toc03 temperature ( c) i cc2 (ma) 60 35 10 -15 40 50 60 70 80 30 -40 85 figure 1 v cc2 = +6v f data = 700kbps slo = low r l = 27 v cc2 = +3.9v (max3535e) v cc2 = +3.13v (max3535e) v cc2 supply voltage vs. temperature max3535e toc04 temperature ( c) v cc2 (v) 60 35 -15 10 3.5 4.0 4.5 5.0 6.0 5.5 6.5 7.0 3.0 -40 85 halo tgm-240ns 1:1.3:1.3 transformer figure 1 r l = open, v cc1 = +5v r l = 27 , v cc1 = +5v r l = 27 , v cc1 = +3v (max3535e) self-oscillation frequency vs. temperature max3535e toc05 temperature ( c) f sos (khz) 60 35 10 -15 300 350 400 450 500 250 -40 85 figure 5 slo = high v cc1 = v cc2 r l = 27 slo = low driver differential output transition time vs. temperature max3535e toc06 temperature ( c) t td (ns) 60 35 10 -15 10 20 30 40 50 60 70 80 90 100 0 -40 85 r l = 27 slo = v cc2 figures 2, 6 v cc2 = +5v v cc2 = +3.13v (max3535e) driver differential output transition time vs. temperature max3535e toc07 temperature ( c) t td (ns) 60 35 10 -15 300 400 500 600 700 800 200 -40 85 r l = 27 slo = gnd2 figures 2, 6 v cc2 = +5v v cc2 = +3.13v (max3535e) switcher frequency vs. temperature max3535e toc08 temperature ( c) f sw (khz) 60 35 10 -15 350 400 450 500 550 600 300 -40 85 switcher frequency vs. supply voltage max3535e toc09 v cc1 (v) f sw (khz) 5.0 4.5 4.0 3.5 350 400 450 500 550 600 300 3.0 5.5
+3v to +5v, 2500v rms isolated rs-485/rs-422 transceivers with 15kv esd protection ______________________________________________________________________________________ 11 receiver-output (ro1) low voltage vs. temperature max3535e toc10 temperature ( c) v ro1l (v) 60 35 10 -15 0.2 0.4 0.6 0.8 1.0 0 -40 85 i sink = 4ma v cc1 = +4.5v v cc1 = +3v (max3535e) v cc1 = +5v receiver-output (ro1) high voltage vs. temperature max3535e toc11 temperature ( c) v ro1h (v) 60 35 10 -15 2.5 3.0 3.5 4.0 4.5 5.0 2.0 -40 85 i source = 4ma v cc1 = +3v (max3535e) v cc1 = +4.5v v cc1 = +5v driver differential output voltage vs. differential output current max3535e toc12 driver differential output current (ma) v od (v) 100 80 20 40 60 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 0 0 120 de = high v cc2 = +3.9v (max3535e) v cc2 = +3.13v (max3535e) v cc2 = +7.5v driver-output high voltage vs. driver source current max3535e toc13 driver source current (ma) v doh (v) 100 80 60 40 20 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 -7 0 120 de = high v cc2 = +3.13v (max3535e) v cc2 = +3.9v (max3535e) v cc2 = +7.5v driver-output low voltage vs. driver sink current max3535e toc14 driver sink current (ma) v dol (v) 100 80 60 40 20 1 2 3 4 5 6 7 8 9 10 11 12 0 0 120 de = high v cc2 = +3.13v (max3535e) v cc2 = +3.9v (max3535e) v cc2 = +7.5v driver differential output voltage vs. v cc2 supply voltage max3535e toc15 v cc2 (v) v od (v) 7.0 6.5 6.0 5.5 5.0 4.5 4.0 3.5 1.8 2.0 2.2 2.4 2.6 2.8 1.6 3.0 7.5 r l = 27 figure 1 receiver output (ro1) voltage vs. load current max3535e toc16 load current (ma) output voltage (v) 10 5 1 2 3 4 5 0 015 output high, sourcing output low, sinking driver differential output voltage vs. temperature max3535e toc17 temperature ( c) v od (v) 60 35 10 -15 1 2 3 4 5 0 -40 85 figure 1 v cc2 = +6v r l = 27 slo = gnd2 v cc2 = +3.13v (max3535e) v cc2 = +7.5v i cc1 supply current vs. v cc1 supply voltage max3535e toc18 v cc1 supply voltage (v) i cc1 (ma) 5.0 4.5 4.0 3.5 1 2 3 4 5 6 7 8 9 10 0 3.0 5.5 r l = open transformer is not driven typical operating characteristics (continued) (v cc1 = +5v, c l = 50pf (figure 1), unless otherwise noted.) max3535e/mxl1535e
max3535e/mxl1535e +3v to +5v, 2500v rms isolated rs-485/rs-422 transceivers with 15kv esd protection 12 ______________________________________________________________________________________ typical operating characteristics (continued) (v cc1 = +5v, c l = 50pf (figure 1), unless otherwise noted.) receiver (ro1) propagation delay (t plh1 ) max3535e toc19 ro 1v/div a-b 1v/div 100ns/div driver propagation delay (slo = low) max3535e toc20 y 2v/div di 2v/div 400ns/div z 2v/div driver propagation delay (slo = high) max3535e toc21 y 2v/div di 2v/div 400ns/div z 2v/div jitter vs. temperature max3535e toc22 temperature ( c) t j (ns) 60 35 10 -15 220 240 260 280 300 200 -40 85 v cc1 = 5.5v v cc1 = 3.13v driver enable time plus jitter max3535e toc23 y 2v/div de 2v/div 200ns/div driver disable time plus jitter max3535e toc24 y 2v/div de 2v/div 200ns/div receiver (ro1) propagation delay (t phl1 ) max3535e toc25 ro 1v/div a-b 1v/div 100ns/div
+3v to +5v, 2500v rms isolated rs-485/rs-422 transceivers with 15kv esd protection ______________________________________________________________________________________ 13 max3535e/mxl1535e pin description pin name isolation side function 1v cc1 logic logic-side/transformer-driver power input. bypass v cc1 to gnd1 with 10? and 0.1? capacitors. 2 st1 logic transformer-driver phase 1 power output. connect st1 to isolation-transformer primary to send power to isolation side of barrier. 3 st2 logic transformer-driver phase 2 power output. connect st2 to isolation-transformer primary to send power to isolation side of barrier. 4 gnd1 logic logic-side ground. for isolated operation do not connect to gnd2. 5?0, 19?4 removed from package 11 gnd2 isolated isolation-side ground. for isolated operation do not connect to gnd1. 12 z isolated rs-485/rs-422 inverting driver output. output floats when de is low or in a barrier fault event. (see the detailed description section for more information.) 13 y isolated rs-485/rs-422 noninverting driver output. output floats when de is low or in a barrier fault event. (see the detailed description section for more information.) 14 v cc2 isolated isolated-side power input. connect v cc2 to the rectified output of transformer secondary. bypass v cc2 to gnd2 with 10? and 0.1? capacitors. 15 b isolated rs-485/rs-422 differential-receiver inverting input 16 a isolated rs-485/rs-422 differential-receiver noninverting input 17 ro2 isolated isol ated - s i d e recei ver o utp ut. ro2 i s al w ays enab l ed . ro 2 g oes hi g h i f a - b > - 10m v . ro2 g oes l ow i f a - b < - 200m v . fai l - safe ci r cui tr y causes ro 2 to g o hi g h w hen a and b fl oat or ar e shor ted . 18 slo isolated driver slew-rate control logic input. connect slo to gnd2 for data rates up to 400kbps. connect slo to v cc2 or leave floating for high data rates. 25 di logic driver input. pull di low (high) to force driver output y low (high) and driver output z high (low). 26 de logic driver-enable input. the driver outputs are enabled and follow the driver input (di) when de is high. when de is floated, the driver is disabled. de does not affect whether the receiver is on or off. 27 re logic receiver-output enable and fault current output. the receiver output (ro1) is enabled and follows the differential-receiver inputs, a and b, when re is low, otherwise ro1 floats. re does not affect ro2 and does not disable the driver. the asserted fault output is a pullup current, otherwise re shows a pulldown current. 28 ro1 logic receiver output. ro1 is enabled when re is low. ro1 goes high if a - b > -10mv. ro1 goes low if a - b < -200mv. fail-safe circuitry causes ro1 to go high when a and b float or are shorted.
max3535e/mxl1535e +3v to +5v, 2500v rms isolated rs-485/rs-422 transceivers with 15kv esd protection 14 ______________________________________________________________________________________ test circuits r l r l v od v oc y z figure 1. driver dc test load di de high c l c l y z gnd gnd2 r l r l figure 2. driver timing test circuit tgm-240 1/2 bat54c transformer driver barrier transceiver isolation barrier barrier transceiver 1/2 bat54c voltage regulator gnd2 +3.0v to +5.5v driver receiver a b y z c l slo ro2 st1 ro1 re de di gnd1 st2 v cc2 v cc1 v cc2 0.1 f 0.1 f control ground rs-485 ground 10 f 10 f max3535e c l 2r l figure 5. self-oscillating configuration 500 v cc2 c l y/z gnd2 500 figure 3. driver timing test load 1k v cc1 /v cc2 c l ro1/ro2 gnd1/gnd2 1k figure 4. receiver timing test load
+3v to +5v, 2500v rms isolated rs-485/rs-422 transceivers with 15kv esd protection ______________________________________________________________________________________ 15 max3535e/mxl1535e switching waveforms di z y v doh v doh t dd t dd t td t td t j v od = v y - v z t r < 10ns, t f < 10ns 1/2 v doh 0v -v doh 20% 80% 1.5v 1.5v 80% 20% figure 6. driver propagation delay t plz v dol + 0.5v v doh - 0.5v v doh /2 v doh /2 t r < 10ns, t f < 10ns 1.5v 1.5v de v doh y, z v dol v doh 0v y, z t pzl 2 x t j t pzh t j t phz output normally high output normally low figure 7. driver enable and disable times t r < 10ns, t f < 10ns t plh1 v ro1h /2 80% 80% 20% 20% v ro1h /2 output input 0v 0v v a - v b v ro1h v ro1l ro1 ro2 t plh1 t phl1 t plh2 t plh2 t j t r t f t j figure 8. receiver propagation delays t r < 10ns, t f < 10ns 1.5v 1.5v re v ro1h ro1 v ro1l v ro1l + 0.5v v ro1h - 0.5v v ro1h ro1 0v output normally low output normally high t hz t lz t zl t zh figure 9. receiver enable and disable times
max3535e/mxl1535e +3v to +5v, 2500v rms isolated rs-485/rs-422 transceivers with 15kv esd protection 16 ______________________________________________________________________________________ detailed description the max3535e/mxl1535e isolated rs-485/rs-422 full- duplex transceivers provide 2500v rms of galvanic isola- tion between the rs-485/rs-422 isolation side and the processor or logic side. these devices allow fast, 1000kbps communication across an isolation barrier even when the common-mode voltages (i.e., the ground poten- tials) on either side of the barrier are subject to large dif- ferences. the isolation barrier consists of two parts. the first part is a capacitive isolation barrier (integrated high- voltage capacitors) that allows data transmission between the logic side and the rs-485/rs-422 isolation side. data is sampled and encoded before it is transmit- ted across the isolation barrier introducing sampling jitter and further delay into the communication system. the second part of the isolation barrier consists of an external transformer with the required primary-to-sec- ondary isolation, allowing the transmission of operating power from the logic side across the isolation barrier to the isolation side. connect the primary of the external transformer to the max3535e/mxl1535e? 420khz transformer driver outputs st1 and st2. since the mxl1535e and the max3535e operate with different supply-voltage requirements at their respective isolated and logic sides, different isolation transformers must be used with each device (see the transformer selection section). the only external components needed to complete the system are the isolation transformer, two diodes, and two low-voltage, 10? decoupling capaci- tors (see the typical application circuit ). the max3535e/mxl1535e include one differential dri- ver, one receiver, and internal circuitry to send the rs- 485 signals and logic signals across the isolation barrier (including the isolation capacitors). the max3535e/ mxl1535e receivers are 1/8 unit load, allowing up to 256 devices on a single bus. the max3535e/mxl1535e feature fail-safe circuitry ensuring the receiver output maintains a logic-high state when the receiver inputs are open or shorted, or when connected to a terminated transmission line with all drivers disabled (see the fail safe section). the max3535e/mxl1535e feature driver slew-rate select that minimizes electromagnetic interference (emi) and reduces reflections caused by improperly terminated cables at data rates below 400kbps. the driver outputs are short-circuit protected for sourcing or sinking current and have overvoltage protection. other features include hot-swap capability, which holds the driver off if the driver logic signals are floated after power is applied. the max3535e/mxl1535e have error-detection circuitry that alerts the processor when there is a fault and disables the driver until the fault is removed. fail safe the max3535e/mxl1535e guarantee a logic-high receiver output when the receiver inputs are shorted or open, or when connected to a terminated transmission line with all drivers disabled. the receiver threshold is fixed between -10mv and -200mv. if the differential receiver input voltage (a - b) is greater than or equal to -10mv, ro1 is logic-high (table 2). in the case of a ter- minated bus with all transmitters disabled, the receiv- er? differential input voltage is pulled to zero by the termination. due to the receiver thresholds of the max3535e/mxl1535e, this results in a logic-high at ro1 with a 10mv minimum noise margin. 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 immediate protection against short cir- cuits over the entire common-mode voltage range. the second, a thermal-shutdown circuit, forces the driver outputs into a high-impedance state if the die tempera- ture exceeds +150?. monitoring faults on re re functions as both an input and an output. as an input, re controls the receiver output enable (ro1). as an output, re is used to indicate when there are faults associated with the operation of the part. this dual functionality is made possible by using an output driver stage that can easily be overdriven by most logic gates. when an external gate is not actively driving re , it is driven either high using a 100? internal pullup current (fault present), or low using a 60? internal pull- down current (no fault). when using re to control the receiver-enable output function, be sure to drive it using a gate that has enough sink and source capabili- ty to overcome the internal drive.
+3v to +5v, 2500v rms isolated rs-485/rs-422 transceivers with 15kv esd protection ______________________________________________________________________________________ 17 max3535e/mxl1535e when not actively driving re , it functions as the fault indicator (table 3). a low on re indicates the part is functioning properly, while a high indicates a fault is present. the four causes of a fault indication are: 1) the voltage on v cc1 is below its undervoltage-lock- out threshold (2.69v nominal) 2) the voltage on v cc2 is below its undervoltage-lock- out threshold (2.80v nominal) 3) there is a problem that prevents the max3535e/ mxl1535e from communicating across its isolation barrier 4) the die temperature exceeds +150 c nominally, causing the part to go into thermal shutdown when a fault occurs, ro1 is switched to a logic-high state if re is low (table 3). open-circuit or short-circuit conditions on the receiver inputs do not generate fault conditions; however, any such condition also puts ro1 in a logic-high state (see the fail safe section). read re for fault conditions by using a bidirectional microcontroller i/o line or a tri-stated buffer as shown in figure 10. when using a tri-stated buffer, enable the driver whenever the voltage on re needs to be forced to a logic-high or logic-low. to read re for a fault con- dition, disable the driver. slew-rate control logic the slo input selects between a fast and a slow slew rate for the driver outputs. connecting slo to gnd2 selects the slow slew-rate option that minimizes emi and reduces reflections caused by improperly terminat- ed cables at data rates up to 400kbps. this occurs because lowering the slew rate decreases the rise and fall times for the signal at the driver outputs, drastically reducing the high-frequency components and harmon- ics at the output. floating slo or connecting it to v cc2 selects the fast slew rate, which allows high-speed operation. ro1 re de di gnd1 re oe fault v cc1 v cc1 tri-stated buffer/ bidirectional microcontroller i/o fault driver output becomes high impedance fault detected oe r max3535e mxl1535e d figure 10. reading a fault condition
max3535e/mxl1535e +3v to +5v, 2500v rms isolated rs-485/rs-422 transceivers with 15kv esd protection 18 ______________________________________________________________________________________ functional tables table 1. transmitting logic transmitting logic inputs outputs de di y z 1110 1001 0 x high impedance high impedance table 2. receiving logic receiving logic inputs outputs re v a - v b ro1 ro2 0 >-10mv 1 1 0 <-200mv 0 0 0 inputs open/shorted 1 1 1 >-10mv high impedance 1 1 <-200mv high impedance 0 1 inputs open/shorted high impedance 1 table 3. fault mode normal mode fault modes function v cc1 > v uvh1 v cc2 > v uvh2 v cc1 < v uvl1 v cc2 > v uvh2 v cc1 > v uvh1 v cc2 < v uvl2 v cc1 < v uvl1 v cc2 < v uvl2 thermal shutdown internal communication fault transformer driver (st1, st2) on on on on off on re = 0 active high high high high high re = v cc1 high impedance high impedance high impedance high impedance high impedance high impedance ro1 re = floating active high impedance high impedance high impedance high impedance high impedance ro2 active active active active active active driver outputs (y, z) active high impedance high impedance high impedance high impedance high impedance internal barrier communication active disabled disabled disabled disabled communication attempted fault indicator on re low (60? pull- down) high (100? pullup) high (100? pullup) high (100? pullup) high (100? pullup) high (100? pullup)
+3v to +5v, 2500v rms isolated rs-485/rs-422 transceivers with 15kv esd protection ______________________________________________________________________________________ 19 max3535e/mxl1535e applications information typical applications the max3535e/mxl1535e transceivers facilitate bi- directional data communications on multipoint bus transmission lines. figure 11 shows a typical rs-485 multidrop-network applications circuit. figure 12 shows the max3535e/mxl1535e functioning as line repeaters with cable lengths longer than 4000ft. to minimize reflections, terminate the line at both ends in its charac- teristic impedance. keep stub lengths off the main line as short as possible. di de ro tgm-240 1/2 bat54c transformer driver barrier transceiver isolation barrier barrier transceiver 1/2 bat54c voltage regulator b a r d re ro de di r 120 d a b re re di de ro b a r d gnd2 +3.3v driver receiver a b y z slo ro2 st1 ro1 re de di gnd1 st2 v cc2 v cc1 v cc2 120 0.1 f 0.1 f control ground rs-485 ground 10 f 10 f max3535e r d figure 11. typical half-duplex multidrop rs-485 network
transformer selection the mxl1535e is a pin-for-pin compatible upgrade of the ltc1535, making any transformer designed for that device suitable for the mxl1535e (see table 4). these transformers all have a turns ratio of about 1:1.3ct. the max3535e can operate with any of the transformers listed in table 4, in addition to smaller, thinner transform- ers designed for the max845 and max253. the 420khz transformer driver operates with single primary and cen- ter-tapped secondary transformers. when selecting a transformer, do not exceed its et product, the product of the maximum primary voltage and half the highest period of oscillation (lowest oscillating frequency). this ensures that the transformer does not enter saturation. calculate the minimum et product for the transformer primary as: et = v max / (2 x f min ) where, v max is the worst-case maximum supply voltage, and f min is the minimum frequency at that supply voltage. using +5.5v and 290khz gives a required minimum et max3535e/mxl1535e +3v to +5v, 2500v rms isolated rs-485/rs-422 transceivers with 15kv esd protection 20 ______________________________________________________________________________________ tgm-250 1/2 bat54c transformer driver barrier transceiver isolation barrier barrier transceiver 1/2 bat54c voltage regulator gnd2 +5v driver receiver a b y z y z slo ro2 st1 ro1 ro re de di di gnd1 st2 v cc2 v cc1 v cc2 0.1 f 0.1 f control ground rs-422 ground 10 f 10 f max3535e mxl1535e max488 r d a b 120 120 r d d r figure 12. using the max3535e/mxl1535e as an rs-422 line repeater v cc1 r oh r oh r ol r ol transformer driver output stage transformer primary gnd1 st1 st2 figure 13. transformer driver output stage
+3v to +5v, 2500v rms isolated rs-485/rs-422 transceivers with 15kv esd protection ______________________________________________________________________________________ 21 max3535e/mxl1535e product of 9.5v-?. the commercially available trans- formers for the max845 listed in table 5 meet that requirement. in most cases, use half of the center-tapped primary winding with the max3535e and leave the other end of the primary floating. most of the transformers in table 5 are 1:1:1 or 1:1:1:1 turns ratio. for +3.3v operation (+3.6v maximum) the required pri- mary et product is 6.2v-?. all of the previously men- tioned transformers meet this requirement. table 6 lists some other transformers with step-up turns ratios specifically tailored for +3.3v operation. most of the transformers in table 6 are 1:1:1.3:1.3. by using a halo tgm-010 or midcom 95061 trans- former, it becomes possible to build a complete isolated rs-485/rs-422 transceiver with a maximum thickness less than 0.1in. to minimize power consumption, select the turns ratio of the transformer to produce the minimum dc voltage required at v cc2 (+3.13v) under worst-case, high-temperature, low-v cc1 , and full-load conditions. for light loads on the isolated side, ensure that the voltage at v cc2 does not exceed +7.5v. for example, the ctx01- 14659 transformer results in 85ma (typ) v cc1 supply cur- rent with full load on the rs-485 driver. using a tgm250 1:1:1 transformer lowers the v cc1 supply current to 65ma (typ), while maintaining good margin on the v cc2 supply. a slight step-down transformer can result in extra power savings in some situations. a custom wound sample transformer with 23 primary turns and 20:20 secondary turns on a ferronics 11-050b core operates well with a v cc1 supply current of 51ma (typ). table 4. transformers for the mxl1535e/max3535e manufacturer part number isolation voltage (1s) phone number cooper electronic technologies, inc. ctx01-14659 500v 561-241-7876 cooper electronic technologies, inc. ctx01-14608 3750v rms 561-241-7876 epcos ag (germany) (usa) b78304-a1477-a3 500v 0 89-626-2-80-00 800-888-7724 midcom, inc. 31160r 1250v 605-886-4385 pulse fee (france) p1597 500v 33-3-85-35-04-04 sumida corporation (japan) s-167-5779 100v 03-3667-3320 transpower technologies, inc. tti7780-sm 500v 775-852-0145 table 5. transformers for max3535e at +5v manufacturer part number isolation voltage (1s) phone number website tgm-010 500v rms tgm-250 2000v rms tgm-350 3000v rms halo electronics, inc. tgm-450 4500v rms 650-903-3800 www.haloelectronics.com/6pin.html bh electronics, inc. 500-1749 3750v rms 952-894-9590 www.bhelectronics.com/pdfs/dc- dcconvertertransformers.pdf coilcraft, inc. u6982-c 1500v rms 800-322-2645 44-1236-730595 www.coilcraft.com/minitrans.cfm 7825355 1500v newport/c&d technologies 7625335 4000v 520-295-4300 www.dc-dc.com/products/productline.asp?ed=9 midcom, inc. 95061 1250v 605-886-4385 www.midcom-inc.com pca electronics, inc. epc3115s-5 700v dc 818-894-5791 www.pca.com/datasheets/epc3117s-x.pdf rhom b us ind ustr i es, inc. t-1110 1800v rms 714-898-0960 www.rhombus-ind.com/pt-cat/maxim.pdf premier magnetics, inc. pm-sm15 1500v rms 949-452-0511 www.premiermag.com/pdf/pmsm15.pdf
15kv 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 have extra protection against static electricity. maxim? engi- neers have developed state-of-the-art structures to pro- tect these pins against esd of ?5kv without damage. the esd structures withstand high esd in all states. after an esd event, the max3535e/mxl1535e keep working without latchup. esd protection can be tested in various ways. the transmitter outputs and receiver inputs of this product family are characterized for pro- tection to ?5kv using the human body model. esd test conditions the ?5kv esd test specifications apply only to the a, b, y, and z i/o pins. the test surge is referenced to gnd2. all remaining pins are ?kv esd protected. human body model figure 14 shows the human body model, and figure 15 shows the current waveform it generates when dis- charged into low impedance. 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. max3535e/mxl1535e +3v to +5v, 2500v rms isolated rs-485/rs-422 transceivers with 15kv esd protection 22 ______________________________________________________________________________________ table 6. transformers for max3535e at +3.3v manufacturer part number isolation voltage (1s) phone number website tgm-040 500v rms tgm-240 2000v rms tgm-340 3000v rms halo electronics, inc. tgm-340 4500v rms 650-903-3800 www.haloelectronics.com/6pin.html bh electronics, inc. 500-2582 2000v rms 952-894-9590 www.bhelectronics.com/pdfs/dc- dcconvertertransformers.pdf coilcraft, inc. q4470-c 1500v rms 800-322-2645 44-1236-730595 www.coilcraft.com/minitrans.cfm 78253335 1500v newport/c&d technologies 76253335 4000v 520-295-4300 www.dc-dc.com/products/productline.asp?ed=9 95062 1250v midcom, inc. 95063 1250v 605-886-4385 www.midcom-inc.com pca electronics, inc. epc3115s-2 700v dc 818-894-5791 www.pca.com/datasheets/epc3117s-x.pdf rhom b us ind ustr i es, inc. t-1107 1800v rms 714-898-0960 www.rhombus-ind.com/pt-cat/maxim.pdf premier magnetics inc. pm-sm16 1500v rms 949-452-0511 www.premiermag.com/pdf/pmsm15.pdf 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 14. human body esd test model
+3v to +5v, 2500v rms isolated rs-485/rs-422 transceivers with 15kv esd protection ______________________________________________________________________________________ 23 max3535e/mxl1535e machine model the machine model for esd tests all pins using a 200pf storage capacitor and zero discharge resis- tance. its objective is to simulate the stress caused by contact that occurs with handling and assembly during manufacturing. all pins require this protection during manufacturing, not just inputs and outputs. therefore, after pc board assembly, the machine model is less relevant to i/o ports. skew the self-oscillation circuit shown in figure 5 is an excel- lent way to get an approximate measure of the speed of the max3535e/mxl1535e. an oscillation frequency of 250khz in this configuration implies a data rate of at least 500kbps for the receiver and transmitter com- bined. in practice, data can usually be sent and received at a considerably higher data rate, normally limited by the allowable jitter and data skew. if the sys- tem can tolerate a 25% data skew, (the difference between t plh1 and t phl1 ), the 285ns maximum jitter specification implies a data rate of 877kbps. lower data rates result in less distortion and jitter (figure 16). higher rates are possible but with more distortion and jitter. the data rate should always be limited below 1.75mbps for both receiver and driver to avoid interfer- ence with the internal barrier communication. layout considerations the max3535e/mxl1535e pin configurations enable optimal pc board layout by minimizing interconnection lengths and crossovers: for maximum isolation, the isolation barrier should not be breached except by the max3535e/mxl1535e and the transformer. connections and components from one side of the barrier should not be located near those of the other side of barrier. a shield trace connected to the ground on each side of the barrier can help intercept capacitive currents that might otherwise couple into the di and slo inputs. in a double-sided or multilayer board, these shield traces should be present on all conductor layers. try to maximize the width of the isolation barrier wherever possible. a clear space of at least 0.25in between gnd1 and gnd2 is recommended. 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 15. human body current waveform 0 10 5 20 15 30 25 35 45 40 50 0 500 750 250 1000 1250 1500 1750 2000 data skew vs. data rate data rate (kbps) data skew (%) typ skew max skew figure 16. data skew vs. data rate graph
max3535e/mxl1535e +3v to +5v, 2500v rms isolated rs-485/rs-422 transceivers with 15kv esd protection 24 ______________________________________________________________________________________ chip information process: bicmos transistor count: 7379 tgm-240 1/2 bat54c transformer driver barrier transceiver isolation barrier barrier transceiver 1/2 bat54c voltage regulator gnd2 +3.3v driver receiver a b y z slo ro2 st1 ro1 c re de di gnd1 st2 v cc2 v cc1 v cc2 0.1 f 0.1 f control ground rs-485 ground 10 f 10 f max3535e typical application circuit
+3v to +5v, 2500v rms isolated rs-485/rs-422 transceivers with 15kv esd protection 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. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 ____________________ 25 2004 maxim integrated products printed usa is a registered trademark of maxim integrated products. 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 .) 28l 16l soic.eps max3535e/mxl1535e

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