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????????????????????????????????????????????????????????????????? maxim integrated products 1 typical operating circuits typical operating circuits continued at end of data sheet. 19-6161; rev 0; 3/12 ordering information appears at end of data sheet. pmbus is a trademark of smif, inc. for related parts and recommended products to use with this part, refer to: www.maxim-ic.com/MAX14850.related general description the MAX14850 is a six-channel digital isolator utilizing maxims proprietary process technology, whose mono - lithic design provides a compact and low-cost transfer of digital signals between circuits with different power domains. the technology enables low power consumption and stable high-temperature performance. the four unidirectional channels are each capable of dc to 50mbps, with two of the four channels passing data across the isolation barrier in each direction. the two bidirectional channels are open drain and each is capable of data rates from dc to 2mbps. independent 3.0v to 5.5v supplies on each side of the isolator also make it suitable for use as a level translator. the MAX14850 can be used for isolating spi busses, i 2 c busses with clock stretching, rs-232, rs-485/rs-422 busses, and general-purpose isolation. when used as a bus isolator, extra channels are available for power monitoring and reset signals. the MAX14850 is available in a narrow body,16-pin so (10mm x 4mm) package. the so package is specified over the -40 n c to +125 n c automotive temperature range. applications industrial control systems i 2 c, spi, smbus, pmbus k interfaces isolated rs-232, rs-485/rs-422 telecommunication systems battery management medical systems benefits and features s protection from high-voltage environments ? 600v rms isolation for 60 seconds ? short-circuit protection on unidirectional outputs s complete digital isolation solution ? four unidirectional signal paths: 2-in/2-out ? two bidirectional open-drain signal paths ? 50mbps (max) unidirectional data rate ? 2mbps (max) bidirectional data rate s compatible with many interface standards ? i 2 c with clock stretching ? spi ? rs-232, rs-422/rs-485 ? smbus, pmbus interfaces i/ oa1 rst cs sclk adc mosi miso gpio1 i/ oa2 gpio2 ina1 sclk ina2 mosi outa1 miso outa2 i/ ob 1 i/ ob 2 outb1 outb2 inb1 inb2 gpio3 c gnda gndb v cca v ccb r pu a r pu a r pu b r pu b 0.1f 0.1f 3.3v 5v v ccb monitor MAX14850 600v rm s isolation MAX14850 six-channel digital isolator evaluation kit available for pricing, delivery, and ordering information, please contact maxim direct at 1-888-629-4642, or visit maxims website at www.maxim-ic.com.
????????????????????????????????????????????????????????????????? maxim integrated products 2 MAX14850 six-channel digital isolator v cca to gnda ........................................................ -0.3v to +6v v ccb to gndb ........................................................ -0.3v to +6v outa1, outa2 to gnda ..................... -0.3v to (v cca + 0.3v) outb1, outb2 to gndb ..................... -0.3v to (v ccb + 0.3v) inb1, inb2, i/oa1, i/oa2 to gnda ........................ -0.3v to +6v ina1, ina2, i/ob1, i/ob2 to gndb ........................ -0.3v to +6v short-circuit duration (outa_ to gnda or v cca , outb_ to gndb or v ccb ) ......................... continuous continuous current (i/oa_, i/ob_) pin ............................ q 50ma continuous power dissipation (t a = +70 n c) so (derate 13.3mw/ n c above +70 n c) .................. 1067mw operating temperature range ........................ -40 n c to +125 n c junction temperature ..................................................... +150 n c storage temperature range ............................ -65 n c to +150 n c lead temperature (soldering, 10s) ................................ +300 n c soldering temperature (reflow) ...................................... +260 n c absolute maximum ratings note 1: package thermal resistances were obtained using the method described in jedec specification jesd51-7, using a four- layer board. for detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial . stresses beyond those listed under absolute maximum ratings may cause permanent damage to the device. these are stress ratings only, and functional opera - tion 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. so junction-to-ambient thermal resistance ( b ja ) .......... 75 n c/w junction-to-case thermal resistance ( b jc ) ............... 24 n c/w package thermal characteristics (note 1) electrical characteristics (v cca C v gnda = 3.0v to 5.5v, v ccb C v gndb = 3.0v to 5.5v, t a = -40c to +125c, unless otherwise noted. typical values are at v cca C v gnda = 3.3v, v ccb C v gndb = 3.3v, and t a = +25c.) (note 2) parameter symbol conditions min typ max unit dc characteristics supply voltage v cca relative to gnda 3.0 5.5 v v ccb relative to gndb 3.0 5.5 supply current i cca, i ccb unidirectional inputs at dc or 2mbps; bidirectional inputs at dc or switching at 2mbps. no load. v cca = +5v, v ccb = +5v 7.2 11 ma v cca = +3.3v, v ccb = +3.3v 6.2 9.5 all inputs switching at max data rate. no load. (note 3) v cca = +5v, v ccb = +5v t a = +25 c 15 22 t a = +125 c 17 24 v cca = +3.3v, v ccb = +3.3v t a = +25 c 10 16 t a = +125 c 11 18 undervoltage lockout threshold v uvlo v cca - v gnda , v ccb - v gndb (note 4) 2 v undervoltage lockout hysteresis v uvlohys v cca - v gnda , v ccb - v gndb (note 4) 0.1 v
????????????????????????????????????????????????????????????????? maxim integrated products 3 MAX14850 six-channel digital isolator electrical characteristics (continued) (v cca C v gnda = 3.0v to 5.5v, v ccb C v gndb = 3.0v to 5.5v, t a = -40c to +125c, unless otherwise noted. typical values are at v cca C v gnda = 3.3v, v ccb C v gndb = 3.3v, and t a = +25c.) (note 2) parameter symbol conditions min typ max unit isolation characteristics isolation voltage v iso t = 60s (note 5) 600 v rms working isolation voltage v iowm v gndb - v gnda continuous (note 3), 50-year life expectancy (figure 4) 200 v rms esd protection all pins 2.5 kv logic inputs and outputs input threshold voltage v it i/oa1, i/oa2, relative to gnda 0.5 0.7 v input logic-high voltage v ih ina1, ina2, relative to gnda 0.7 x v cca v inb1, inb2, relative to gndb 0.7 x v ccb i/oa1, i/oa2, relative to gnda 0.7 i/ob1, i/ob2, relative to gndb 0.7 x v ccb input logic-low voltage v il ina1, ina2, relative to gnda 0.8 v inb1, inb2, relative to gndb 0.8 i/oa1, i/oa2, relative to gnda 0.5 i/ob1, i/ob2, relative to gndb 0.3 x v ccb output logic-high voltage v oh outa1, outa2, relative to gnda, source current = 4ma v cca - 0.4 v outb1, outb2, relative to gndb, source current = 4ma v ccb - 0.4 output logic-low voltage v ol outa1, outa2, relative to gnda, sink current = 4ma 0.8 v outb1, outb2, relative to gndb, sink current = 4ma 0.8 i/oa1, i/oa2, relative to gnda, sink current = 10ma 0.6 0.9 i/oa1, i/oa2, relative to gnda, sink current = 0.5ma 0.6 0.85 i/ob1, i/ob2, relative to gndb, sink current = 30ma 0.4 input/output logic-low threshold difference d v tol i/oa1, i/oa2 (note 6) 50 mv input capacitance c in ina1, ina2, inb1, inb2, f = 1mhz 2 pf dynamic switching characteristics common-mode transient immunity dv iso /dt v in = v cc_ or v gnd_ (notes 3, 7) 1.5 kv/ f s
????????????????????????????????????????????????????????????????? maxim integrated products 4 MAX14850 six-channel digital isolator electrical characteristics (continued) (v cca C v gnda = 3.0v to 5.5v, v ccb C v gndb = 3.0v to 5.5v, t a = -40c to +125c, unless otherwise noted. typical values are at v cca C v gnda = 3.3v, v ccb C v gndb = 3.3v, and t a = +25c.) (note 2) parameter symbol conditions min typ max unit maximum data rate (note 3) dr max ina1 to outb1, ina2 to outb2, inb1 to outa1, inb2 to outa2 50 mbps i/oa1 to i/ob1, i/oa2 to i/ob2, i/ob1 to i/oa1, i/ob2 to i/oa2 2 minimum pulse width pw min ina1 to outb1, ina2 to outb2, inb1 to outa1, inb2 to outa2 (note 3) 20 ns propagation delay (note 3) t dplh t dphl ina1 to outb1, ina2 to outb2, inb1 to outa1, inb2 to outa2, r l = 1m i , c l = 15pf, figure 1 v cca = v ccb = +3.3v 20 30 ns v cca = v ccb = +5v 18 26 i/oa1 to i/ob1, i/oa2 to i/ob2, r 1 = 1.6k i , r 2 = 180 i , c l1 = c l2 = 15pf, figure 2 v cca = v ccb = +3.3v 30 100 v cca = v ccb = +5v 30 100 i/ob1 to i/oa1, i/ob2 to i/oa2, r 1 = 1k i , r 2 = 120 i , c l1 = c l2 = 15pf, figure 2 v cca = v ccb = +3.3v 60 100 v cca = v ccb = +5v 60 100 pulse-width distortion | t dplh C t dphl | (notes 3, 8) pwd ina1 to outb1, ina2 to outb2, inb1 to outa1, inb2 to outa2, r l = 1m i , c l = 15pf, figure 1 v cca = v ccb = +3.3v 7 ns v cca = v ccb = +5v 7 i/oa1 to i/ob1, i/oa2 to i/ob2, r 1 = 1.6k i , r 2 = 180 i , c l1 = c l2 = 15pf, figure 2 v cca = v ccb = +3.3v 12 v cca = v ccb = +5v 12 i/ob1 to i/oa1, i/ob2 to i/oa2, r 1 = 1k i , r 2 = 120 i , c l1 = c l2 = 15pf, figure 2 v cca = v ccb = +3.3v 60 v cca = v ccb = +5v 50
????????????????????????????????????????????????????????????????? maxim integrated products 5 MAX14850 six-channel digital isolator electrical characteristics (continued) (v cca C v gnda = 3.0v to 5.5v, v ccb C v gndb = 3.0v to 5.5v, t a = -40c to +125c, unless otherwise noted. typical values are at v cca C v gnda = 3.3v, v ccb C v gndb = 3.3v, and t a = +25c.) (note 2) parameter symbol conditions min typ max unit channel-to-channel skew (notes 3, 8) t dskewcc outb1 to outb2 output skew, figure 1 v cca = v ccb = +3.3v 3 ns v cca = v ccb = +5v 3 outa1 to outa2 output skew, figure 1 v cca = v ccb = +3.3v 3 v cca = v ccb = +5v 3 i/ob1 to i/ob2 output skew, figure 2 v cca = v ccb = +3.3v 6 v cca = v ccb = +5v 5 i/oa1 to i/oa2 output skew, figure 2 v cca = v ccb = +3.3v 20 v cca = v ccb = +5v 20 part-to-part skew (notes 3, 8) t dskewpp d t dplh , d t dphl 8 ns rise time (note 3) t r outa1, outa2, outb1, outb2, 10% to 90%, figure 1 5 ns fall time (note 3) t f outa1, outa2, outb1, outb2, 90% to 10%, figure 1 5 ns i/oa1, i/oa2, 90% to 10%, r 1 = 1.6k i , r 2 = 180 i , c l1 = c l2 = 15pf, figure 2 v cca = v ccb = +3.3v 30 60 v cca = v ccb = +5v 40 80 i/ob1, i/ob2, 90% to 10%, r 1 = 1k i , r 2 = 120 i , c l1 = c l2 = 15pf, figure 2 v cca = v ccb = +3.3v 3 6 v cca = v ccb = +5v 3 5
????????????????????????????????????????????????????????????????? maxim integrated products 6 MAX14850 six-channel digital isolator insulation and safety characteristics note 2: all units are production tested at t a = +25c. specifications over temperature are guaranteed by design. all voltages of side a are referenced to gnda. all voltages of side b are referenced to gndb, unless otherwise noted. note 3: guaranteed by design. not production tested. note 4: the undervoltage lockout threshold and hysteresis guarantee that the outputs are in a known state during a slump in the supplies. see the detailed description section for more information. note 5: the isolation is guaranteed for t = 60s, and tested at 120% of the guaranteed value for 1s. note 6: d v tol = v ol C v il . this is the minimum difference between the output logic-low voltage and the input logic threshold for the same i/o pin. this ensures that the i/o channels are not latched low when any of the i/o inputs are driven low (see the bidirectional channels section). note 7: the common-mode transient immunity guarantees that the device will hold its outputs stable when the isolation voltage changes at the specified rate. note 8: pulse-width distortion is defined as the difference in propagation delay between low-to-high and high-to-low transitions on the same channel. channel-to-channel skew is defined as the difference in propagation delay between different chan - nels on the same device. part-to-part skew is defined as the difference in propagation delays (for unidirectional channels) between different devices, when both devices operate with the same supply voltage, at the same temperature and have identical package and test circuits. parameter symbol conditions value unit iec insulation and safety related for specifications for soic-16 external tracking (creepage) cpg iec 60664-1 4.2 mm external air gap (clearance) clr iec 60664-1 4.2 mm minimum internal gap insulation thickness 0.0026 mm tracking resistance (comparative tracking index) cti iec 112/vde 030 part 1 175 v insulation resistance across barrier r iso 1 g w capacitance across isolation barrier c io f = 1mhz 12 pf vde iec insulation characteristics surge isolation voltage v iosm iec 60747-17, section 5.3.1.6 and 5.4.6 for basic insulation 1 kv peak repetitive peak isolation voltage v iorm iec 60747-17, section 5.3.1.3 282 v peak rated transient isolation voltage v iotm iec 60747-17, section 5.3.1.4 850 v peak safety limiting temperature t s iec 60747-17, section 7.2.1 +150 c safety limiting side a power dissipation p sa iec 60747-17, section 7.2.1 0.75 w safety limiting side b power dissipation p sb iec 60747-17, section 7.2.1 0.75 w apparent charge method q pd iec 60747-17, section 7.4, method a and b 5 pc overvoltage category iec 60664-1, single- or three-phase 50v dc or ac i, ii overvoltage category iec 60664-1, single- or three-phase 100v dc or ac i climatic category 40/125/21 pollution degree din vde 0110, table 1 2
????????????????????????????????????????????????????????????????? maxim integrated products 7 MAX14850 six-channel digital isolator test circuits/timing diagrams figure 1. test circuit (a) and timing diagram (b) for unidirectional channels figure 2. test circuit (a) and timing diagrams (b) and (c) for bidirectional channels 0.1f v ccb v cca test source ina_ outb_ MAX14850 gnda gndb v cca v ccb c l r l 0.1f 50 (a) (b) v cca ina1, ina2 50% 50% 50% 50% 90% 10% 50% t dphl t dskewcc t f t r t dplh outb1 outb2 v ccb v ccb gnda gndb gndb v cca i/oa1, i/oa2 (a) (b) 50% 50% 50% 90% 50% 10% 50% t dphl t dskewcc t f t dplh i/ob1 i/ob2 v ccb v ccb gnda v ol (min) v ol (min) v ccb i/ob1, i/ob2 (c) 50% 50% 50% 50% 90% 10% 50% t dphl t f t dplh i/oa1 i/oa2 v cca v cca gndb v ol (min) v ol (min) t dskewcc 0.1f v ccb v cca test source i/oa_ i/ob_ MAX14850 gnda gndb v cca v ccb c l2 c l1 0.1f r 2 r 1
????????????????????????????????????????????????????????????????? maxim integrated products 8 typical operating characteristics (v cca C v gnda = 3.3v, v ccb C v gndb = 3.3v, all inputs idle, t a = +25 n c, unless otherwise noted. i cca vs. data rate MAX14850 toc01 data rate (mbps) i cca (ma) 10 1 0.1 0.01 1 2 3 4 5 6 7 8 9 0 0.001 100 ina1/ina2 switching inb1/inb2 switching i ccb vs. data rate MAX14850 toc02 data rate (mbps) i ccb (ma) 10 1 0.1 0.01 1 2 3 4 5 6 7 8 9 0 0.001 100 inb1/inb2 switching ina1/ina2 switching i cca vs. data rate MAX14850 toc03 data rate (mbps) i cca (ma) 1 0.1 0.01 1 2 3 4 5 6 7 0 0.001 10 i/oa1/i/oa2 switching i/ob1/i/ob2 switching pullup = 2k i ccb vs. data rate MAX14850 toc04 data rate (mbps) i ccb (ma) 1 0.1 0.01 1 2 3 4 5 6 7 8 0 0.001 10 i/ob1/i/ob2 switching i/oa1/i/oa2 switching pullup = 2k i cca vs. v cca MAX14850 toc05 v cca (v) i cca (ma) 5.0 4.5 4.0 3.5 1 2 3 4 5 6 7 8 9 10 0 3.0 5.5 t a = +25c t a = -40c t a = +125c i ccb vs. v ccb MAX14850 toc06 v ccb (v) i ccb (ma) 5.0 4.5 4.0 3.5 1 2 3 4 5 6 7 8 9 10 0 3.0 5.5 t a = -40c t a = -40c t a = +125c i cc vs.temperature MAX14850 toc07 temperature (c) i cc (ma) 110 95 65 80 -10 5 20 35 50 -25 1 2 3 4 5 6 7 8 9 0 -40 125 i ccb i cca outa_ v oh vs. source current MAX14850 toc08 i source (ma) outa_ v oh (v) 60 45 30 15 1 2 3 4 5 0 07 5 v cca = 5v v cca = 3.3v outa_ v ol vs. sink current MAX14850 toc09 i sink (ma) outa_ v ol (v) 60 45 30 15 1 2 3 4 5 0 07 5 v cca = 5v v cca = 3.3v MAX14850 six-channel digital isolator
????????????????????????????????????????????????????????????????? maxim integrated products 9 typical operating characteristics (continued) (v cca C v gnda = 3.3v, v ccb C v gndb = 3.3v, all inputs idle, t a = +25 n c, unless otherwise noted. outb_ v oh vs. source current MAX14850 toc10 i source (ma) outb_ v oh (v) 60 45 30 15 1 2 3 4 5 0 07 5 v ccb = 3.3v v ccb = 5v outb_ v ol vs. sink current MAX14850 toc11 i sink (ma) outb_ v ol (v) 60 45 30 15 1 2 3 4 5 0 07 5 v ccb = 3.3v v ccb = 5v propagation delay vs. supply voltage max1960 toc12 v dda (v) propagation delay (ns) 5.0 4.5 3.5 4.0 2 4 6 8 12 10 14 16 0 3.0 5.5 v gndb - v gnda = -100v v gndb - v gnda = +100v v gndb - v gnda = 0v v dda = v ddb ina_ to outb_ low to high transition v dda (v) propagation delay (ns) 5.0 4.5 4.0 3.5 2 4 6 8 10 12 0 3.0 5.5 propagation delay vs. supply voltage MAX14850 toc13 v gndb - v gnda = -100v v gndb - v gnda = +100v v gndb - v gnda = 0v v dda = v ddb ina_ to outb_ high to low transition propagation delay vs.capacitive load MAX14850 toc14 c l (pf) propagation delay (ns) 80 60 40 20 2 4 6 8 10 12 14 16 18 0 0 100 high to low ina_ to outb_ low to high propagation delay vs. temperature MAX14850 toc15 t a (c) propagation delay (ns) 110 95 65 80 -10 5 20 35 50 -25 2 4 6 8 10 12 14 16 18 0 -40 125 high to low ina_ to outb_ low to high propagation delay vs. supply voltage max1960 toc16 v dda (v) propagation delay (ns) 5.0 4.5 3.5 4.0 2 4 6 8 12 10 14 16 0 3.0 5.5 v gndb - v gnda = +100v v gndb - v gnda = -100v v gndb - v gnda = 0v v dda = v ddb inb_ to outa_ low to high transition v dda (v) propagation delay (ns) 5.0 4.5 4.0 3.5 2 4 6 8 10 12 0 3.0 5.5 propagation delay vs. supply voltage MAX14850 toc17 v gndb - v gnda = -100v v gndb - v gnda = +100v v gndb - v gnda = 0v v dda = v ddb inb_ to outa_ high to low transition propagation delay vs. capacitive load MAX14850 toc18 c l (pf) propagation delay (ns) 80 60 40 20 2 4 6 8 10 12 14 16 18 20 0 0 100 high to low inb_ to outa_ low to high MAX14850 six-channel digital isolator
???????????????????????????????????????????????????????????????? maxim integrated products 10 typical operating characteristics (continued) (v cca C v gnda = 3.3v, v ccb C v gndb = 3.3v, all inputs idle, t a = +25 n c, unless otherwise noted. propagation delay vs. temperature MAX14850 toc19 t a (c) propagation delay (ns) 110 95 65 80 -10 5 20 35 50 -25 2 4 6 8 10 12 14 16 18 0 -40 125 high to low inb_ to outa_ low to high propagation delay vs. supply voltage MAX14850 toc20 v dda (v) propagation delay (ns) 5.0 4.5 4.0 3.5 5 10 15 20 25 30 35 0 3.0 5.5 v gndb - v gnda = -100v v gndb - v gnda = 0v v gndb - v gnda = +100v v dda = v ddb i/oa_ to i/ob_ low to high transition pullup = 1ki propagation delay vs. supply voltage MAX14850 toc21 v dda (v) propagation delay (ns) 5.0 4.5 4.0 3.5 5 10 15 20 0 3.0 5.5 v gndb - v gnda = -100v v gndb - v gnda = 0v v gndb - v gnda = +100v v dda = v ddb i/oa_ to i/ob_ high to low transition v dda (v) propagation delay (ns) 5.0 4.5 4.0 3.5 5 10 15 20 25 30 0 3.0 5.5 propagation delay vs. supply voltage MAX14850 toc23 v gndb - v gnda = -100v v gndb - v gnda = 0v v gndb - v gnda = +100v v dda = v ddb i/ob_ to i/oa_ low to high transition pullup = 1k i propagation delay vs. temperature MAX14850 toc25 propagation delay (ns) 10 20 30 40 50 60 0 t a (c) 110 95 80 65 50 35 20 5 -10 -25 -40 125 low to high i/ob_ to i/oa_ pullup = 1ki high to low propagation delay vs.temperature MAX14850 toc22 t a (c) propagation delay (ns) 110 95 80 65 50 35 20 5 -10 -25 10 20 30 40 50 0 -40 125 high to low i/oa_ to i/ob_ pullup = 1k i low to high v dda (v) propagation delay (ns) 5.0 4.5 4.0 3.5 10 20 30 40 50 60 0 3.0 5.5 propagation delay vs. supply voltage MAX14850 toc24 v gndb - v gnda = -100v v gndb - v gnda = 0v v gndb - v gnda = +100v v dda = v ddb i/ob_ to i/oa_ high to low transition MAX14850 six-channel digital isolator
???????????????????????????????????????????????????????????????? maxim integrated products 11 MAX14850 six-channel digital isolator pin description pin configuration pin name function voltage relative to 1 v cca supply voltage of logic side a. bypass v cca with a 0.1 f f ceramic capacitor to gnda. gnda 2 ina1 logic input 1 on side a. ina1 is translated to outb1. gnda 3 ina2 logic input 2 on side a. ina2 is translated to outb2. gnda 4 outa1 logic output 1 on side a. outa1 is a push-pull output. gnda 5 outa2 logic output 2 on side a. outa2 is a push-pull output. gnda 6 i/oa1 bidirectional input/output 1 on side a. i/oa1 is translated to/from i/ob1 and is a open-drain output. gnda 7 i/oa2 bidirectional input/output 2 on side a. i/oa2 is translated to/from i/ob2 and is a open-drain output. gnda 8 gnda ground reference for side a 9 gndb ground reference for side b 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 v cca v ccb outb1 outb2 inb1 inb2 i/ob1 i/ob2 gndb top view ina1 ina2 i/oa1 outa1 outa2 i/oa2 gnda MAX14850 + so
???????????????????????????????????????????????????????????????? maxim integrated products 13 MAX14850 six-channel digital isolator ground isolation/level shifting the MAX14850 tolerates a ground difference of 600v rms . therefore, v gnda can be 850vdc higher or lower than v gndb . in addition, the device translates logic levels when (v cca Cv gnda ) is higher or lower voltage than (v ccb Cv gndb ), as long as each is within the valid 3.0v to 5.5v range. unidirectional and bidirectional channels the MAX14850 operates both as a unidirectional device and bidirectional device simultaneously. each unidirec - tional channel can only be used in the direction shown in the functional diagram. the bidirectional channels func - tion without requiring a direction control input. unidirectional channels the device features four unidirectional channels that operate independently with guaranteed data rates from dc to 50mbps. the output driver of each unidirectional channel is push-pull, eliminating the need for pullup resistors. the outputs are able to drive both ttl and cmos logic inputs. bidirectional channels the device features two bidirectional channels that have open-drain outputs. the bidirectional channels do not require a direction control input. a logic-low on one side causes the corresponding pin on the other side to be pulled low while avoiding data latching within the device. the input logic-low threshold (v it ) of i/oa1 and i/oa2 are at least 50mv lower than the output logic-low voltages of i/ oa1 and i/oa2. this prevents an output logic-low on side a from being accepted as an input low and subsequently transmitted to side b, thus preventing a latching action. the i/oa1, i/oa2, i/ob1, and i/ob2 pins have open-drain outputs, requiring pullup resistors to their respective sup - plies for logic-high outputs. the output low voltages are guaranteed for sink currents of up to 30ma for side b, and 10ma for side a (see the electrical characteristics table). the bidirectional channels of the device support i 2 c clock stretching. startup and undervoltage lockout the v cca and v ccb supplies are both internally moni - tored for undervoltage conditions. undervoltage events can occur during power-up, power-down, or during normal operation due to a slump in the supplies. when an undervoltage event is detected on either of the supplies, all outputs on both sides are automatically controlled, regard - less of the status of the inputs. the bidirectional outputs become high impedance and are pulled high by the exter - nal pullup resistor on the open-drain output. the unidirec - tional outputs are pulled high internally to the voltage of the v cca or v ccb supply during undervoltage conditions. when an undervoltage condition is detected on either supply, all unidirectional outputs are pulled to the supplies ( table 1 ). the bidirectional outputs are high impedance and pulled to the supplies by the external pullup resistors. safety regulatory approvals the MAX14850 is safety certified by ul, csa, and iec 60747-5-2. per ul1577, the MAX14850 is 100% tested at an equivalent v iso of 720v rms for one second (see table 2 ). figure 3 shows the behavior of the outputs during power- up and power-down. table 2. safety regulatory approvals (pending) table 1. output behavior during undervoltage conditions v in v cca v ccb v outa? v outb? 1 powered powered 1 1 0 powered powered 0 0 x under voltage powered follows v cca 1 x powered under voltage 1 follows v ccb safety agency standard isolation number file number ul ul1577 recognized 600v rms isolation voltage for 60 seconds pending vde approved to 60747-17 basic insulation, 600v rms for 60 seconds pending
???????????????????????????????????????????????????????????????? maxim integrated products 14 MAX14850 six-channel digital isolator applications information affect of continuous isolation on lifetime high-voltage conditions cause insulation to degrade over time. higher voltages result in faster degradation. even the high-quality insulating material used in the MAX14850 can degrade over long periods of time with a constant high-voltage across the isolation barrier. figure 4 shows the life expectancy of the MAX14850 vs. working isolation voltage. power-supply sequencing the MAX14850 does not require special power-supply sequencing. the logic levels are set independently on either side by v cca and v ccb . each supply can be pres - ent over the entire specified range regardless of the level or presence of the other. power-supply decoupling to reduce ripple and the chance of introducing data errors, bypass v cca and v ccb with 0.1 f f ceramic capacitors to gnda and gndb, respectively. place the bypass capacitors as close to the power-supply input pins as possible. figure 4. life expectancy vs. working isolation voltage figure 3. undervoltage lockout behavior life expectancy vs. working isolation voltage working isolation voltage (v iowm ) - v rms working life - years (log scale) 700 600 500 400 300 200 100 0.1 1 10 100 50 1000 0.001 0 800 v iowm = 200v rms v cca v ccb v outa_ v outb_ v i /oa_ v i /ob_ 400s/div 5v/div
???????????????????????????????????????????????????????????????? maxim integrated products 15 MAX14850 six-channel digital isolator typical operating circuits (continued) i/ oa 1s da scl rst dac ldac sda i/ oa2 scl ina1 gpio1 reset load dac ina2 gpio2 outa1 outa2 i/ ob 1 i/ ob 2 outb1 outb2 inb1 inb2 gpio3 spare c gnda gndb v cca v ccb r pu a r pu a r pu b r pu b 0.1f 0.1f 3.3v 5v v ccb monitor MAX14850 600v rm s isolation
???????????????????????????????????????????????????????????????? maxim integrated products 16 MAX14850 six-channel digital isolator chip information process: bicmos ordering information +denotes a lead(pb)-free/rohs-compliant package. package information for the latest package outline information and land patterns (footprints), go to www.maxim-ic.com/packages . note that a +, #, or - in the package code indicates rohs status only. package drawings may show a different suffix character, but the drawing pertains to the package regardless of rohs status. typical operating circuits (continued) part temp range pin-package MAX14850ase+ -40 n c to +125 n c 16 so package type package code outline no. land pattern no. 16 so s16+3 21-0041 90-0097 i/ oa1 gpio1 outa1 rx i/ oa2 ina1 rts ina2 tx outa2 i/ ob 1 inb1 i/ ob 2 outb1 outb2 inb2 gpio3 c gnda gndb v cca v ccb r pu a r pu b 0.1f 0.1f 3.3v 5v v ccb monitor max13085e 600v rm s isolation re ro de di a b MAX14850
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. the parametric values (min and max limits) shown in the electrical characteristics table are guaranteed. other parametric values quoted in this data sheet are provided for guidance. maxim integrated products, 120 san gabriel drive, sunnyvale, ca 94086 408-737-7600 17 ? 2012 maxim integrated products maxim is a registered trademark of maxim integrated products, inc. revision history revision number revision date description pages changed 0 3/12 initial release MAX14850 six-channel digital isolator

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