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hot swappable, dual i 2 c isolators, 5 kv data sheet adum2250/ adum2251 rev. c document feedback information furnished by analog devices is believed to be accurate and reliable. however, no responsibility is assumed by analog devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. specifications subject to change without notice. no license is granted by implication or otherwise under any patent or patent rights of analog devices. trademarks and registered trademarks are the property of their respective owners. one technology way, p.o. box 9106, norwood, ma 02062-9106, u.s.a. tel: 781.329.4700 ?2007C2014 analog devices, inc. all rights reserved. technical support www.analog.com features bidirectional i 2 c communication open-drain interfaces suitable for hot swap applications 30 ma current sink capability 1000 khz operation 3.0 v to 5.5 v supply/logic levels 16-lead soic wide body package version (rw-16) 16-lead soic wide body enhanced creepage version (ri-16-2) high temperature operation: 105c safety and regulatory approvals ul recognition: 5000 v rms for 1 minute per ul 1577 csa component acceptance notice #5a (ri-16-2 package) iec 60601-1: 250 v rms (reinforced) iec 60950-1: 400 v rms (reinforced) vde certificate of conformity din v vde v 0884-10 (vde v 0884-10):2006-12 v iorm = 849 v peak qualified for automotive applications applications isolated i 2 c, smbus, or pmbus interfaces multilevel i 2 c interfaces power supplies networking power-over-ethernet general description the adum2250 / adum2251 1 are hot swappable digital isolators with nonlatching, bidirectional communication channels that are compatible with i 2 c interfaces. this eliminates the need for splitting i 2 c signals into separate transmit and receive signals for use with standalone optocouplers. the adum2250 provides two bidirectional channels, supporting a complete isolated i 2 c interface. the adum2251 provides one bidirectional channel and one unidirectional channel for those applications where a bidirectional clock is not required. the adum2250 / adum2251 contain hot swap circuitry to prevent data glitches when an unpowered card is inserted onto an active bus. these isolators are based on i coupler? chip scale transformer technology from analog devices, inc. i coupler is a magnetic isolation technology with performance, size, power consump- tion, and functional advantages compared to optocouplers. the adum2250 / adum2251 integrate i coupler channels with semi- conductor circuitry to enable a complete, isolated i 2 c interface in a small form factor package. functional block diagrams decode encode encode decode decode encode encode decode g nd 1 nc v dd1 nc sda 1 scl 1 g nd 1 nc gnd 2 nc v dd2 nc sda 2 scl 2 gnd 2 nc 06670-001 8 7 5 6 4 3 2 1 9 10 12 11 13 14 15 16 adum2250 nc = no connect decode encode encode decode encode decode gnd 1 nc v dd1 nc sda 1 scl 1 gnd 1 nc gnd 2 nc v dd2 nc sda 2 scl 2 gnd 2 nc 06670-002 8 7 5 6 4 3 2 1 9 10 12 11 13 14 15 16 adum2251 nc = no connect figure 1. adum2250 functional block diagram figure 2. adum2251 functional block diagram 1 protected by u.s. patents 5,952,849; 6,873, 065; and 7,075,329; othe r patents pending.
adum2250/adum2251 data sheet rev. c | page 2 of 16 table of contents features .............................................................................................. 1 applications ....................................................................................... 1 general description ......................................................................... 1 functional block diagrams ............................................................. 1 revision history ............................................................................... 2 specifications ..................................................................................... 3 electrical characteristics ............................................................. 3 package characteristics ............................................................... 5 regulatory information ............................................................... 5 insulation and safety - related specifications ............................ 5 din v vde v 0884 - 10 (vde v 0884 - 10):2006 - 12 insulation characteristics .............................................................................. 6 recommended operating conditions ...................................... 6 absolute max imum ratings ............................................................7 esd caution ...................................................................................7 pin configuration and function descriptions ..............................8 test conditions ..................................................................................9 applications information .............................................................. 10 functional description .............................................................. 10 startup .......................................................................................... 11 capacitive load at low speeds ................................................ 11 magnetic field immunity .......................................................... 12 outline dimensions ....................................................................... 13 ordering guide .......................................................................... 14 automotive products ................................................................. 14 revi sion history 4/1 4 rev. b to rev. c changes to features section ............................................................ 1 added capacitive load at low speeds section .......................... 11 changes to ordering guide .......................................................... 14 added automotive products section .......................................... 14 3/13 rev. a to rev. b created hyperlink for safety and regulatory approvals entry in features section ................................................................. 1 changes to features section ............................................................ 1 changes to table 4 ............................................................................ 5 changes to din v vde v 0884 - 10 (vde v 0884 - 10):2006 - 12 section and table 6 ........................... 6 reformatted table 8 ......................................................................... 7 changes to figure 4, table 9, and table 10 ................................... 8 moved test conditions section ...................................................... 9 changes to functional description section ............................... 10 changes to captions of figure 8 and figure 9 ............................ 11 9 /11 rev. 0 to rev. a added 16- lead soic ......................................................... universal changes to features section and endnote 1 .................................. 1 changes to table 4 and table 5 ....................................................... 6 changes to endnote 1 in table 7 ..................................................... 7 changes to functional description section and figure 7 ........ 10 updated outline dimensions ....................................................... 13 changes to ordering guide .......................................................... 1 3 4 /07 revision 0: initial version
data sheet adum2250/adum2251 rev. c | page 3 of 16 specifications electrical character istics dc specifications all voltages are relative to their respect ive ground s. all min imum /max imum specifications apply over the entire recommended operating range, unless otherwise noted. all typical specifications are at t a = 25c, v dd1 = 5 v, and v dd2 = 5 v, unless otherwise noted. table 1. pa rameter symbol min typ max unit test conditions / comments adum2250 input supply current, side 1, 5 v i dd1 2.8 5.0 ma v dd1 = 5 v input supply current, side 2, 5 v i dd2 2.7 5.0 m a v dd2 = 5 v input supply current, side 1, 3.3 v i dd1 1.9 3.0 ma v dd1 = 3.3 v input supply current, side 2, 3.3 v i dd2 1.7 3.0 ma v dd2 = 3.3 v adum2251 input supply current, si de 1, 5 v i dd1 2.8 6.0 ma v dd1 = 5 v input supply current, side 2, 5 v i dd2 2.5 4.7 ma v dd2 = 5 v input supply current, side 1, 3.3 v i dd1 1.8 3.0 ma v dd1 = 3.3 v input supply current, side 2, 3.3 v i dd2 1.6 2.8 ma v dd2 = 3.3 v leakage currents i is da1 , i isda2 , i iscl1 , i iscl2 0.01 10 a v sda1 = v dd1 , v sda2 = v dd2 , v scl1 = v dd1 , v scl2 = v dd2 side 1 logic levels logic input threshold 1 v sda1il , v scl1il 500 700 mv logic low output voltage v sda1ol , v scl1ol 600 900 mv i sda1 = i scl1 = 3.0 ma 600 850 mv i sda1 = i scl1 = 0.5 ma input/output logic low level difference 2 v sda1 , v scl1 50 mv side 2 logic levels logic low input voltage v sda2il , v scl2il 0.3 v dd2 v logic high input voltage v sda2ih , v scl2ih 0.7 v dd2 v logic low output voltage v sda2ol , v scl2ol 400 mv i sda2 = i scl2 = 30 ma 1 v il < 0.5 v, v ih > 0.7 v. 2 v s1 = v s1ol ? v s1il . this is the minimum difference between the output logic low level and the input logic low threshold within a given component. this ensures that there is no possibility of the part latching up the bus to which it is connected.
adum2250/adum2251 data sheet rev. c | page 4 of 16 ac specifications all voltages are relative to their respective ground s. all min imum /max imum specifications apply over the entire recommended operating range, unless otherwise noted. all typical specifications are at t a = 25c, v dd1 = 5 v, and v dd2 = 5 v, unless otherwise noted. see figure 5 for a timing test diagram . table 2. parameter symbol min typ max nit test conditions /comments maximum frequency 1000 khz output f all t ime 5 v operation 4.5 v v dd1 , v dd2 5.5 v, c l1 = 40 pf, r 1 = 1.6 k , c l2 = 400 pf, r 2 = 180 side 1 output (0.9 v dd1 to 0.9 v) t f1 13 26 120 ns side 2 output (0.9 v dd2 to 0.1 v dd2 ) t f2 32 52 120 ns 3 v operation 3.0 v v dd1 , v dd2 3.6 v, c l1 = 40 pf, r 1 = 1.0 k , c l2 = 400 pf, r 2 = 120 side 1 output (0.9 v dd1 to 0.9 v) t f1 13 32 120 ns side 2 output (0.9 v dd2 to 0.1 v dd2 ) t f2 32 61 120 ns propagation d elay 5 v operation 4.5 v v dd1 , v dd2 5.5 v, c l1 = c l2 = 0 pf, r 1 = 1.6 k , r 2 = 180 side 1 to side 2, rising edge 1 t plh12 95 130 ns side 1 to side 2, falling edge 2 t phl12 162 275 ns side 2 to side 1, rising edge 3 t plh21 31 70 ns side 2 to side 1, falling edge 4 t phl21 85 155 ns 3 v operation 3.0 v v dd1 , v dd2 3. 6 v, c l1 = c l2 = 0 pf, r 1 = 1.0 k , r 2 = 120 side 1 to side 2, rising edge 1 t plh12 82 125 ns side 1 to side 2, fall ing edge 2 t phl12 196 340 ns side 2 to side 1, rising edge 3 t plh21 32 75 n s side 2 to side 1, falling ed ge 4 t phl21 110 210 ns p ulse width distortion 5 v operation 4.5 v v dd1 , v dd2 5.5 v, c l1 = c l2 = 0 pf, r 1 = 1.6 k , r 2 = 180 side 1 to side 2, |t plh12 ? t phl12 | pwd 12 67 145 ns side 2 to side 1, |t plh21 ? t phl21 | pwd 21 54 85 ns 3 v operation 3.0 v v dd1 , v dd2 3.6 v, c l1 = c l2 = 0 pf , r 1 = 1.0 k , r 2 = 120 side 1 to side 2, |t plh12 ? t phl12 | pwd 12 114 215 ns side 2 t o side 1, |t plh21 ? t phl21 | pwd 21 77 135 ns c ommon - m ode transient i mmunity 5 |cm h |, |cm l | 25 35 kv/s 1 t plh12 propagation delay is measured from the side 1 input logic threshold to an output value of 0.7 v dd2 . 2 t phl12 propagation delay is measured from the side 1 input logic threshold to an output value of 0.4 v. 3 t plh21 propagation delay is measured from the s ide 2 input logic threshold to an output value of 0.7 v dd1 . 4 t phl21 p ropagation delay is measured from the side 2 input logic threshold to an output value of 0.9 v. 5 cm h is the maximum common - mode voltage slew rate that can be sustained while maintaining v o > 0.8 v dd2 . cm l is the maximum common - mode voltage slew rate tha t can be sustained while maintaining v o < 0.8 v. the common - mode voltage slew rates apply to both rising and falling common - mode voltage edges. the transient magnitude is the range over wh ich the common mode is slewed.
data sheet adum2250/adum2251 rev. c | page 5 of 16 package characterist ics table 3. parameter symbol min typ max unit test conditions/comments r esistance (input to out put) 1 r i- o 10 12 capacitance (input to output) 1 c i- o 2.2 pf f = 1 mhz input capacitance c i 4.0 pf ic junction - to - ambient thermal resistance ja 45 c/w thermocouple located at center of package underside 1 the d evice is considered a 2 - terminal device ; pin 1 through pin 8 are shorted together, and pin 9 through pin 16 are shorted together. r egulatory informatio n the adum2250 / adum2251 are approved by the organizations listed in table 4 . table 4. ul csa vde recognized under ul 1577 c omponent r eco g nition p ro gram 1 approved under csa component acceptance notice #5a certified according to din v vde v 0884 - 10 (vde v 0884 - 10):2006-12 2 single p rotection , 5000 v rms i solation v ol t age basic insulation per csa 60950-1- 07 and iec 60950-1, 600 v rms (84 9 v peak) maximum working voltage reinforced insulation, 84 9 v peak rw - 16 package: reinforced insulation per csa 60950 -1- 07 and iec 60950-1, 380 v rms (537 v peak) maxim um working vol t age r einforced insulation per iec 60601 - 1 , 125 v rms (176 v peak) maximum working voltage ri -16-2 package: reinforced insulation per csa 60950 -1- 07 and iec 60950-1, 400 v rms (565 v peak) maximum working vol t age r einforced insulation per iec 60601 - 1 , 250 v rms (353 v peak) maximum working voltage file e214100 file 205078 file 2471900 - 4880 - 0001 1 in accordance with ul 1577, each adum2250 / adum2251 is proof tested by applying an insulation test voltage 6000 v rms for 1 sec (current leakage detection limit = 10 a). 2 in accordance with din v vde v 0884 - 10 (vde v 0884 - 10):2006 - 12 , each adum2250/ adum2251 is proof tested by applying an insulation test voltage 1590 v peak for 1 sec (partial discharge detection limit = 5 pc). the asterisk (*) marking branded on the component designates din v vde v 0884 - 10 (vde v 0884 - 10):2006 - 12 approval. insulation and safet y - related specificatio ns table 5. parameter symbol value unit test conditions/comments rate d diel ectric insulation voltage 5000 v rms 1- minute duration minimum external air gap (clearance) l(i01) 8.0 min mm distance measured from input terminals to output terminals, shortest distance through air along the pcb mounting plane, as an aid to pc board la yout minimum external tracking (creepage) l(i02) measured from input terminals to output terminals, shortest distance path along body rw - 16 package 7.7 min mm ri - 16 - 2 package 8.3 min mm minimum in ternal distance (internal clearance) 0.017 min mm insulation distance through insulation tracking resistan ce (comparative tracking index) cti >175 v din iec 112/vde 0303 , part 1 isolation group iiia material group (din vde 0110, 1/89, table 1)
adum2250/adum2251 data sheet rev. c | page 6 of 16 din v vde v 0884 - 10 (vde v 0884-10) :2006-12 insulatio n characteristics th ese isolators are suitable for reinforced isolation only within the safety limit data. maintenance of the safety data is ensured by protective circuits. t he asterisk (*) marking branded on the component designates din v vde v 0884 - 10 (v de v 0884 - 10):2006 - 12 approval for an 84 9 v peak working voltage. table 6. description test conditions /comments symbol characteristic unit installation classification per din vde 0110 for rated mains voltage 300 v rms i to iv for rated mains voltage 450 v rms i to ii for rated mains voltage 60 0 v rms i to ii climatic classification 40/105/21 pollution degree per din vde 0110, table 1 2 maximum working insulation voltage v iorm 849 v p eak input -to - output test voltage, method b1 v iorm 1.875 = v pr , 100% production test, t m = 1 sec, partial discharge < 5 pc v pr 1592 v peak input -t o - output test voltage, method a v pr after environmental tests subgroup 1 v iorm 1.6 = v pr , t m = 60 sec , partial discharge < 5 pc 1358 v peak after input and/or safety test s subgroup 2 and subgroup 3 v iorm 1.2 = v pr , t m = 60 sec, partial discharge < 5 pc 1018 v peak highest allowable overvoltage transient overvoltage, t tr = 10 sec v tr 6000 v peak saf ety - limiting values maximum value all owed in the event of a failure ( see figure 3) case temperature t s 150 c supply current i dd1 + i dd2 i s 555 ma insulation resistance at t s v io = 500 v r s >10 9 thermal derating curve 600 500 400 300 200 100 0 safe operating v dd1 current (ma) 0 50 100 150 200 ambient temperature (c) 06670-003 figure 3 . thermal derat ing curve, dependence of safety - limiting values on case temperature, per din v vde v 0884 - 10 recommended operatin g conditions table 7. parameter symbol min max unit operating tempe rature t a ?40 +105 c supply voltages 1 v dd1 , v dd2 3.0 5.5 v input/output signal voltage v sda1 , v scl1 , v sda2 , v scl2 5.5 v capacitive load side 1 c l1 40 pf side 2 c l2 400 pf static output loading side 1 i sda1 , i scl1 0.5 3 ma side 2 i sda2 , i scl2 0.5 30 ma 1 all voltages are relative to their respective ground s .
data sheet adum2250/adum2251 rev. c | page 7 of 16 absolute maximum rat ings t a = 25c, unless otherwise noted. table 8. parameter rating storage temperature (t st ) ? 6 5c to +150c ambient operating temperature (t a ) ?40c to +105c supply voltages (v dd1 , v dd2 ) 1 ?0.5 v to +7.0 v input/output voltage side 1 (v sda1 , v scl1 ) 1 ?0.5 v to v dd1 + 0.5 v side 2 (v sda2 , v scl2 ) 1 ?0.5 v to v dd2 + 0.5 v average output current per pin 2 side 1 (i o1 ) 18 ma side 2 (i o2 ) 100 ma common - mode transients 3 ?100 kv/s to +100 kv/s 1 all voltages are relative to their respectiv e grounds. 2 see figure 3 for maximum rated current values for various temperatures. 3 refers to common - mode transients across the insulation barrier. common - mode transients exceeding the absolute maximum rating may cause latch - up or permanent damage . stresses above those listed under absolute maximum ratings may cause permanent damage to the device. this is a stress rating only; functional operation of the device at these or any other conditi ons above those indicated in the operational section of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. esd caution
adum2250/adum2251 data sheet rev. c | page 8 of 16 pin configuration and fu nction descriptions 06670-004 nc = no connect adum2250/ adum2251 top view (not to scale) gnd 1 1 nc 2 v dd1 3 nc 4 gnd 2 16 nc 15 v dd2 14 nc 13 sda 1 5 sda 2 12 scl 1 6 scl 2 11 gnd 1 7 nc 10 nc 8 gnd 2 9 notes 1. pin 1 and pin 7 are internally connected to each other, and it is recommended that both pins be connected to a common ground. 2 . pin 9 and pin 16 are internally connected to each other, and it is recommended that both pins be connected to a common ground. figure 4. pin configuration table 9. adum2250 pin function descriptions pin no. mnemonic description 1, 7 gnd 1 ground 1. ground reference for isolator side 1. pin 1 and pin 7 are internally connected to each other, and it is recommended that both pins be connected to a common ground. 2, 4, 8, 10, 13, 15 nc no connect. 3 v dd1 supply voltage, 3.0 v to 5.5 v. 5 sda 1 data input/output, side 1. 6 scl 1 clock input/output, side 1. 9, 16 gnd 2 ground 2. isolated ground reference for isolator side 2. pin 9 and pin 16 are internally connected to each other, and it is recommended that both pins be connected to a common ground. 11 scl 2 clock input/output, side 2. 12 sda 2 data input/output, side 2. 14 v dd2 supply voltage, 3.0 v to 5.5 v. table 10. adum2251 pin function descriptions pin no. mnemonic description 1, 7 gnd 1 ground 1. ground reference for isolator side 1. pin 1 and pin 7 are internally connected to each other, and it is recommended that both pins be connected to a common ground. 2, 4, 8, 10, 13, 15 nc no connect. 3 v dd1 supply voltage, 3.0 v to 5.5 v. 5 sda 1 data input/output, side 1. 6 scl 1 clock input, side 1. 9, 16 gnd 2 ground 2. isolated ground reference for isolator side 2. pin 9 and pin 16 are internally connected to each other, and it is recommended that both pins be connected to a common ground. 11 scl 2 clock output, side 2. 12 sda 2 data input/output, side 2. 14 v dd2 supply voltage, 3.0 v to 5.5 v.
data sheet adum2250/adum2251 rev. c | page 9 of 16 test conditions decode encode encode decode decode encode encode decode gnd 1 nc v dd1 nc sda 1 scl 1 nc gnd 1 gnd 2 nc v dd2 nc sda 2 scl 2 nc gnd 2 06670-005 8 7 5 6 4 3 2 1 12 11 13 14 15 16 r 1 c l1 r 1 c l1 r 2 c l2 r 2 c l2 10 adum2250 nc = no connect 9 figure 5 . timing test diagram
adum2250/adum2251 data sheet rev. c | page 10 of 16 application s information functional d escription th e adum2250 / adum2251 interface on each side to i 2 c sig - nals. internally, the bidirectional i 2 c signals are split into t wo unidirectional channels communicating in opposi te directions via dedicated i coupler isolation channels. one channel of each pair (the s ide 1 input of each i/o pin in figure 6 ) implements a special input buffer and output driver that can differentiate between externally generated inpu ts and its own output signals. it transfers only externally generated input signals to the corresponding side 2 data or clock pin. both the side 1 and side 2 i 2 c pins are designed to interface to a n i 2 c bus operating in the 3.0 v to 5.5 v range. a logic low on either side causes the corresponding i/o pin across the coupler to be pulled low enough to comply with the logic low threshold requirements of other i 2 c devices on the bus. b us contention and la tch - up are avoided by guaranteeing that the input low threshold at sda 1 or scl 1 is at least 50 mv less than the output low signal at the same pin. this prevents an output logic low at side 1 from being transmitted back to side 2 and pulling down the i 2 c bu s by latching the state. because the side 2 logic levels/thresholds and drive capabilities comply fully with standard i 2 c values, multiple adum2250 / adum2251 devices connected to a bus by their side 2 pins can communicate with each other and with other i 2 c- compatib le devices , as shown in figure 7 . n ote the distinction between i 2 c compatibility an d i 2 c compliance. i 2 c compatibility refers to situ - ations in which the logic levels or drive capability of a component do not necessarily meet the requirements of the i 2 c spec ification but still allow the component to com municate with an i 2 c- com - pliant dev ice. i 2 c compliance refers to situations in which the logic levels and drive capability of a component fully meet the requirements of the i 2 c specification. because the side 1 pin has a modified output level/input threshold, s ide 1 of the adum2250 / adum2251 can communicate only with devices that are fully compliant with the i 2 c standard. in other words, side 2 of the adum2250 / adum2251 is i 2 c- compliant , wh ereas side 1 is only i 2 c- compatible. the side 1 i/o pins must not be connected to oth er i 2 c buffers that implement a similar scheme of dual i/o threshold detection. this latch - up prevention scheme is implemented in several popular i 2 c level shifting and bus extension products currently available from analog devices and other manufacturers. care should be taken to review the data sheet of potential i 2 c bus buffering prod - ucts to ensure that only one buffer on a bus segment implements a dual threshold scheme. a bus segment is a portion of the i 2 c bus that is isolated from other portions o f the bus by galvanic isolation, bus extenders , or level shifting buffers. table 11 shows how multiple adum2250 / adum2251 components can coexist on a bus as long as two si de 1 buffers are not connected to the same bus segment. table 11. adum2250 / adum2251 buffer compatibility side 1 side 2 side 1 no yes side 2 yes yes the output logic low levels are independent of the v dd1 and v dd2 voltages. the input logic low threshold at side 1 is a lso independent of v dd1 . however, the input logic low threshold at side 2 is design ed to be at 0.3 v dd2 , consistent with i 2 c require - ments. the side 1 and side 2 i/o pins have open - collector outputs whose high levels are set via pull - up resistors to their respective supply voltages. decode encode encode decode decode encode encode decode gnd 1 nc v dd1 nc sda 1 scl 1 nc gnd 1 gnd 2 nc v dd2 nc sda 2 scl 2 nc gnd 2 06670-006 8 7 5 6 4 3 2 1 12 11 13 14 15 16 10 adum2250 symbol indicates a dual threshold input buffer. nc = no connect 9 figure 6 . adum2250 block diagram figure 7 shows a typical application circuit , including the pull - up re sistors required for both side 1 and side 2 buses. bypass capac - itors with values from 0.01 f to 0. 1 f are required between v dd1 and gnd 1 and between v dd2 and gnd 2 . the 200 ? resistor shown in figure 7 is required for latch - up immunity if the ambient temperature can be between 105c and 125c. v dd1 optiona l 200? sd a 1 sc l 1 gnd 1 v dd2 sd a 2 sc l 2 gnd 2 8 7 5 6 4 3 2 1 9 12 1 1 13 14 15 16 10 adum2250 06670-007 micro- processor or seconda r y bus segment i 2 c bus figure 7 . typical isolated i 2 c interface u sing the adum2250
data sheet adum2250/adum2251 rev. c | page 11 of 16 startup both the v dd1 and v dd 2 supplies have an underv oltage lockout feature that prevent s the signal channels from operating unless certain criteria are met . thi s feature prevents the possibility of input logic low signals pulling down the i 2 c bus inadvertently during power - up/power - down. f or the signal channels to be enabled , the following c ri teria must be met : ? both supplies must be at least 2.5 v. ? at least 40 s must elapse after both supplies exceed the internal start - up threshold of 2.0 v. until both criteria are met for both supp lies, the adum2250 / adum2251 outputs are pulled high , thereby ensuring a startup that avoids any disturbances on the b us. figure 8 and figure 9 illustrate the supply conditions for fast and slow input supply slew rates. supp l y v alid minimum recommended oper a ting supp l y , 3.0v minimum v alid supp l y , 2.5v interna l s t ar t -up threshold, 2.0v 40s 06670-008 figure 8 . start - u p condition, supply slew rat e > 12.5 v/ ms supp l y v alid minimum recommended oper a ting supp l y , 3.0v minimum v alid supp l y , 2.5v interna l s t ar t -up threshold, 2.0v 40s 06670-009 figure 9 . start - up co ndition, s upply s lew r ate < 12.5 v/ms capacitive load at l ow s peeds the adum2250 / adum2 251 are designed for operation at speeds up to 1 mbps. due to the limited current available on side 1 operation at 1 mbps limits the capacitance that can be driven at the minimum pull - up value to 40 p f. most applications operate at 100 kbps in standard m ode or 400 kbps in fast mode. at these lower operating speeds, the limitation on the load capacitance can be significantly relaxed. table 12 shows the maximum capacitance at minimum pull - up values for sta ndard and fast operating m odes. if larger values for the pull - u p resistor are used, the maximum supported capacitance must be scaled down proportionately so that the rise time does not increase beyond the values required by the standard. table 12. side 1 ma ximum load conditions maximum capacitive load for side 1 mode vdd1 data rate (kbps) t r (ns) t f (ns) r 1 () c l1 (pf) standard 5 100 1000 187 1600 484 fast 5 400 300 172 1600 120 standard 3.3 100 1000 270 1000 771 fast 3.3 400 300 235 1000 188
adum2250/adum2251 data sheet rev. c | page 12 of 16 magnetic field immunity the adum2250 / adum2251 are extremely immune to external magnetic fields. the limitation on the magnetic field immunity of the adum2250 / adum2251 is set by the condition in which induced voltage in the receiving coil of the transformer is suffi- ciently large to either falsely set or reset the decoder. the following analysis defines the conditions under which this may occur. the 3 v operating condition of the adum2250 / adum2251 is examined because it represents the most susceptible mode of operation. the pulses at the transformer output have an amplitude greater than 1.0 v. the decoder has a sensing threshold at approximately 0.5 v, thus establishing a 0.5 v margin in which induced voltages can be tolerated. the voltage induced across the receiving coil is given by v = ( ?d/dt ) r n 2 ; n = 1, 2, , n where: is the magnetic flux density (gauss). r n is the radius of the n th turn in the receiving coil (cm). n is the number of turns in the receiving coil. given the geometry of the receiving coil in the adum2250/ adum2251 and an imposed requirement that the induced voltage be, at most, 50% of the 0.5 v margin at the decoder, a maximum allowable magnetic field is calculated, as shown in figure 10. magnetic field frequency (hz) 100 0.001 1m 10 0.01 1k 10k 10m 0.1 1 100m 100k 06670-010 maximum allowable magnetic flux density (kgauss) figure 10. maximum allowable external magnetic flux density for example, at a magnetic field frequency of 1 mhz, the maxi- mum allowable magnetic field of 0.2 kgauss induces a voltage of 0.25 v at the receiving coil. this voltage is approximately 50% of the sensing threshold and does not cause a faulty output transition. similarly, if such an event occurs during a transmitted pulse (and is of the worst-case polarity), it reduces the received pulse from >1.0 v to 0.75 vstill well above the 0.5 v sensing threshold of the decoder. the preceding magnetic flux density values correspond to specific current magnitudes at given distances away from the adum2250/ adum2251 transformers. figure 11 expresses these allowable current magnitudes as a function of frequency for selected distances. as shown in figure 11, the adum2250/ adum2251 are extremely immune and can be affected only by extremely large currents operated at high frequency very close to the component. for the 1 mhz example, a 0.5 ka current must be placed 5 mm away from the adum2250 / adum2251 to affect the operation of the component. note that at combinations of strong magnetic fields and high frequencies, any loops formed by printed circuit board traces can induce error voltages sufficiently large to trigger the thresholds of succeeding circuitry. exercise care in the layout of such traces to avoid this possibility. magnetic field frequency (hz) maximum allowable current (ka) 1000 100 10 1 0.1 0.01 1k 10k 100m 100k 1m 10m distance = 5mm distance = 1m distance = 100mm 06670-011 figure 11. maximum allowable current for various current-to- adum2250 / adum2251 spacings
data sheet adum2250/adum2251 rev. c | page 13 of 16 outline dimensions controlling dimensions are in millimeters; inch dimensions (in parentheses) are rounded-off millimeter equivalents for reference only and are not appropriate for use in design. compliant to jedec standards ms-013-aa 10.50 (0.4134) 10.10 (0.3976) 0.30 (0.0118) 0.10 (0.0039) 2.65 (0.1043) 2.35 (0.0925) 10.65 (0.4193) 10.00 (0.3937) 7.60 (0.2992) 7.40 (0.2913) 0 . 7 5 ( 0 . 0 2 9 5 ) 0 . 2 5 ( 0 . 0 0 9 8 ) 45 1.27 (0.0500) 0.40 (0.0157) c oplanarity 0.10 0.33 (0.0130) 0.20 (0.0079) 0.51 (0.0201) 0.31 (0.0122) seating plane 8 0 16 9 8 1 1.27 (0.0500) bsc 03-27-2007-b figure 12. 16-lead standard small outline package [soic_w] wide body (rw-16) dimensions shown in millimeters (inches) 11-15-2011-a 16 9 8 1 seating plane coplanarity 0.1 1.27 bsc 12.85 12.75 12.65 7.60 7.50 7.40 2.64 2.54 2.44 1.01 0.76 0.51 0.30 0.20 0.10 10.51 10.31 10.11 0.46 0.36 2.44 2.24 pin 1 mark 1.93 ref 8 0 0.32 0.23 0.71 0.50 0.31 45 0.25 bsc gage plane compliant to jedec standards ms-013-ac figure 13. 16-lead standard small outline package, with increased creepage [soic_ic] wide body (ri-16-2) dimensions shown in millimeters
adum2250/adum2251 data sheet rev. c | page 14 of 16 ordering guide model 1 , 2 number of inputs, v dd1 side number of inputs , v dd2 side maximum data rate (mbps) tempera ture range package description package option adum2250arwz 2 2 1 ?40 c to +105 c 16- lead soic_w rw -16 adum2250arwz -rl 2 2 1 ?40c to +105c 16- lead soic_w, 13 tape and reel rw -16 adum2250warwz 2 2 1 ?40c to +1 0 5c 16- lead soic_w rw -16 adum2250 w arwz - rl 2 2 1 ?40 c to +10 5 c 16 - lead soic_w, 13 tape and reel rw - 16 adum2250ariz 2 2 1 ?40c to +105c 16- lead soic_ic ri -16-2 adum2250ariz -rl 2 2 1 ?40c to +105c 16- lead soic_ic, 13 tape and reel ri -16-2 adum2 251arwz 2 1 1 ?40 c to +105 c 16 - lead soic_w rw - 16 adum2251arwz -rl 2 1 1 ?40c to +105c 16- lead soic_w, 13 tape and reel rw -16 adum2251warwz 2 1 1 ?40c to +10 5c 16- lead soic_w rw -16 adum2251 w arwz -rl 2 1 1 ?40 c to +10 5c 16- lead soic_w, 13 tape and reel rw -16 adum2251ariz 2 1 1 ?40c to +105c 16- lead soic_ ic ri -16-2 adum2251ariz -rl 2 1 1 ?40c to +105c 16- lead soic_ ic , 13 tape and reel ri -16-2 1 z = rohs compliant part. 2 w = qualified for automotive applications. automotive products the adum225 0w and adum2251w models are available with controlled manufacturing to support the quality and reliability requirements of automotive applications. note that these automotive model may ha ve specifications that differ from the commercial model; therefore, designers should review the specifications section of this data sheet carefully. only the automotive grade products shown are available for use in automotive appl ications. contact your local analog devices account representative for specific product ordering information and to obtain the specific automotive reliability reports for these models.
data sheet adum2250/adum2251 rev. c | page 15 of 16 notes
adum2250/adum2251 data sheet rev. c | page 16 of 16 notes ? 2007 C 2014 analog devic es, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owners. d06670 - 0 - 4/14(c)

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