IL3522 isoloop ? is a registered trademark of nve corporation. *u.s. patent number 5,831, 426; 6,300,617 and others. rev. e distributed by: rhopoint components www.rhopointcomponents.com email: sales@rhopointcomponents.com isolated rs485/rs422 interface functional diagram isode a b z de d r re y IL3522 IL3522 receiver re r v (a ? b) h z x l h 200 mv l l ? 200 mv l h open IL3522 driver de d v (y ? z) l x z h h 200 mv h l ? 200 mv h = high level, l = low level x = irrelevant, z = high impedance features ? 3.3 / 5 v input supply compatible ? 2500 v rms isolation (1 minute) ? 20 ns propagation delay ? 40 mbps data rate ? 1 ns pulse skew ? 20 kv/ s transient immunity ? thermal shutdown protection ? ? 40c to +85c temperature range ? 16-pin soic package ? ul1577 and iec 61010-2001 approval applications ? security networks ? building environmental controls ? industrial control networks ? gaming systems ? factory automation description the IL3522 is a galvanically isolated, high-speed differential bus transceiver, designed for bidir ectional data communication on balanced transmission lines. the device uses nve?s patented* isoloop spintronic giant magnetoresistance (gmr) technology. the il3585 delivers an exceptional 2.3 v differential output into a 54 ? load over the supply range of 4.5 v to 5.5 v. this provides better data integrity over longer ca ble lengths, even at data rates as high as 40 mbps. the device is al so compatible with 3.3 v input supplies, allowing interface to st andard microcontrollers without additional level shifting. current limiting and thermal shutdown features protect against output short circuits and bus contention that may cause excessive power dissipation. receiver inputs feature a ?fail-safe if open? design, ensuring a logic high r- output if a/b are floating.
IL3522 2 distributed by: rhopoint components www.rhopointcomponents.com email: sales@rhopointcomponents.com absolute maximum ratings (11) parameters symbol min. typ. max. units test conditions storage temperature t s ? 65 150 c ambient operating temperature t a ? 40 100 c voltage range at any bus pin ? 7 12 v supply voltage (1) v dd 1 , v dd 2 ? 0.5 7 v digital input voltage ? 0.5 v dd + 0.5 v digital output voltage ? 0.5 v dd + 1 v recommended operating conditions parameters symbol min. typ. max. units test conditions supply voltage v dd 1 v dd 2 3.0 4.5 5.5 5.5 v input voltage at any bus terminal (separately or common mode) v i v ic 12 ? 7 v high-level digital input voltage v ih 2.4 3.0 v dd 1 v v dd 1 = 3.3 v v dd 1 = 5.0 v low-level digital input voltage v il 0 0.8 v differential input voltage (2) v id +12/ ? 7 v high-level output current (driver) i oh 60 ma high-level digital output current (receiver) i oh 8 ma low-level output current (driver) i ol ? 60 ma low-level digital output current (receiver) i ol ? 8 ma ambient operating temperature t a ? 40 85 c digital input sign al rise and fall times t ir , t if dc stable insulation specifications parameters symbol min. typ. max. units test conditions creepage distance (external) 8.08 mm barrier impedance > 10 14 || 7 ? || pf leakage current 0.2 a rms 240 v rms , 60 hz safety and approvals iec61010-2001 tuv certificate numbers: n1502812, n1502812-101 classification: reinforced insulation model package pollution degree mate rial group max. working voltage il3585 soic (0.3") ii iii 300 v rms ul 1577 component recognition program file number: e207481 rated 2500v rms for 1 minute soldering profile per jedec j-std-020c, msl=2 electrostatic disch arge sensitivity this product has been tested for electros tatic sensitivity to the limits stated in the specifications. however, nve recommends that all integrated circuits be handled with appropriate care to avoid damage. damage caused by inappropriate handling or storage could range from performance degradation to complete failure.
IL3522 3 distributed by: rhopoint components www.rhopointcomponents.com email: sales@rhopointcomponents.com IL3522 pin connections 1 v dd1 input power supply 2 gnd 1 input power supply ground return 3 r output data from bus 4 re read data enable (if re is high, r = high impedance) 5 de drive enable 6 d data input to bus 7 nc no internal connection 8 gnd 1 input power supply ground return 9 gnd 2 output power supply ground return 10 isode isolated de output for use in profibus applications where the state of the isolated drive enable node needs to be monitored 11 y y bus (drive ? true) 12 z z bus (drive ? inverse) 13 b b bus (receive ? inverse) 14 a a bus (receive ? true) 15 gnd 2 output power supply ground return 16 v dd2 output power supply vdd 1 vdd 2 gnd 1 d gnd 2 r a re b de z nc y isode gnd 1 gnd 2 IL3522
IL3522 4 distributed by: rhopoint components www.rhopointcomponents.com email: sales@rhopointcomponents.com driver section electrical specifications are t min to t max and v dd = 4.5 v to 5.5 v, unless otherwise stated. parameters symbol min. typ. (5) max. units test conditions input clamp voltage v ik ? 1.5 v i l = ? 18 ma output voltage v o v dd v i o = 0 differential output voltage (12) |v od 1 | v dd v i o = 0 differential output voltage (12) |v od 2 | 2.5 3 5 v r l = 54 ? , v dd = 5 v differential output voltage (12, 6) v od 3 2.3 5 v r l = 54 ? , v dd = 4.5 v change in magnitude of differential output voltage (7) |v od | 0.2 v r l = 54 ? or 100 ? common mode output voltage v oc 3 v r l = 54 ? or 100 ? change in magnitude of common mode output voltage (7) |v oc | 0.2 v r l = 54 ? or 100 ? output current (4) i o 1 ? 0.8 ma output disabled, v o = 12 v o = ? 7 high level input current i ih 10 a v i = 3.5 v low level input current i il ? 10 a v i = 0.4 v absolute |short-circuit output current| i os 250 ma ? 7 v > v o < 12 v supply current v dd 1 = +5 v v dd 1 = +3.3 v i dd 1 i dd 1 4 3 6 4 ma no load (outputs enabled) notes (apply to both driver and receiver sections): 1. all voltage values are with respect to netw ork ground except differential i/o bus voltages. 2. differential input voltage is measured at the noninverting terminal a with respect to the inverting terminal b. 3. skew limit is the maximum propagation delay difference between any two devices at 25c. 4. the power-off measurement in ans i standard eia/tia-422-b applies to disabled out puts only and is not applied to combined inp uts and outputs. 5. all typical values are at v dd 1 ,v dd 2 = 5 v or v dd 1 = 3.3 v and t a = 25c. 6. ? 7 v < v cm < 12 v; 4.5 v < v dd < 5.5 v. 7. |v od | and |v oc | are the changes in magnitude of v od and v oc , respectively, that occur when the input is changed from one logic state to the other. 8. this applies for both power on and power off, refer to ansi standard rs-485 for exact conditio n. the eia/tia-422-b limit doe s not apply for a combined driver and receiver terminal. 9. includes 10 ns read enable time. maximum pr opagation delay is 25 ns after read assertion. 10. pulse skew is defined as |t plh ? t phl | of each channel. 11. absolute maximum specifications mean the device will not be damaged if operated under thes e conditions. it does not guarant ee performance. 12. differential output voltage is measured at terminal y with respect to z.
IL3522 5 distributed by: rhopoint components www.rhopointcomponents.com email: sales@rhopointcomponents.com receiver section electrical specifications are t min to t max and v dd = 4.5 v to 5.5 v, unless otherwise stated. parameters symbol min. typ. (5) max. units test conditions positive-going input threshold voltage (2) v it + 0.2 v ? 7 v > v cm < 12 v negative-going input threshold voltage (2) v it - ? 0.2 v ? 7 v > v cm < 12 v hysteresis voltage (v it + ? v it - ) v hys 40 mv v cm = 0 v, t = 25c high level digital output voltage v oh v dd ? 0.2 v dd v v id = 200 mv i oh = ? 20 a low level digital output voltage v ol 0.2 v v id = ? 200 mv i oh = 20 a high-impedance-state output current i oz 1 a v o =0.4 to (v dd 2 ? 0.5) v line input current (8) i i 1 ma v i = 12 v ? 0.8 ma v i = ? 7 v input resistance r i 20 k ? supply current i dd 2 5 8 ma no load (outputs enabled) switching characteristics v dd1 = +5 v, v dd2 = +5 v parameters symbol min. typ. (5) max. units test conditions data rate 40 mbps r l = 54 ? , c l = 50 pf propagation delay (2, 9) t pd 27 35 ns v o = ? 1.5 to 1.5 v, c l = 15 pf pulse skew (2, 10) t sk (p) 1 6 ns v o = ? 1.5 to 1.5 v, c l = 15 pf skew limit (3) t sk (lim) 2 12 ns r l = 54 ? , c l = 50 pf output enable time to high level t pzh 15 25 ns c l = 15 pf output enable time to low level t pzl 15 25 ns c l = 15 pf output disable time from high level t phz 15 25 ns c l = 15 pf output disable time from low level t plz 15 25 ns c l = 15 pf v dd1 = +3.3 v, v dd2 = +5 v parameters symbol min. typ. (5) max. units test conditions data rate 40 mbps r l = 54 ? , c l = 50 pf propagation delay (2, 9) t pd 30 38 ns v o = ? 1.5 to 1.5 v, c l = 15 pf pulse skew (2, 10) t sk (p) 1 6 ns v o = ? 1.5 to 1.5 v, c l = 15 pf skew limit (3) t sk (lim) 4 12 ns r l = 54 ? , c l = 50 pf output enable time to high level t pzh 17 27 ns c l = 15 pf output enable time to low level t pzl 17 27 ns c l = 15 pf output disable time from high level t phz 17 27 ns c l = 15 pf output disable time from low level t plz 17 27 ns c l = 15 pf
IL3522 6 distributed by: rhopoint components www.rhopointcomponents.com email: sales@rhopointcomponents.com power consumption isoloop isolators achieve their low power consumption from the wa y they transmit data across the isolation barrier . by detectin g the edge transitions of the input logic signal and converting these to narrow current pulses, a magnetic field is created around the gmr wheatstone bridge. depending on the direction of the magnetic field, the br idge causes the output comparator to switch following the input logic signal. since the current pulses are narrow, about 2.5 ns, the power cons umption is independent of mark-to-space ratio and solely depen dent on frequency. this has obvious advantages over optocouplers, which have power consumption heavily dependent on frequency and time. table 2. typical dynamic supply currents. data rate (mbps) i dd1 i dd2 1 100 a 100 a 10 1 ma 1 ma 20 2 ma 2 ma 40 4 ma 4 ma power supply decoupling both v dd1 and v dd2 must be bypassed with 47 nf cer amic capacitors. these should be placed as close as possible to v dd pins for proper operation. additionally, v dd2 should be bypassed with a 10 f tantalum capacitor. dc correctness the il3585 incorporates a patented refresh circuit to maintain th e correct output state with resp ect to data input. at power up , the bus outputs will follow the function table shown on page 1. the de input should be held low during power-up to eliminate false drive data p ulses from the bus. an external power supply monitor to mi nimize glitches caused by sl ow power-up and power-down transients is not required. application information receiver features the receiver includes a ?fail-safe if open? function that guaran tees a high level output if th e receiver inputs are unconnected (floating). the receiver output ?r? has tri-state capability via the active low re input. driver features the rs-422 driver is differential output and delivers at least 1.5 v across a 54 ? load. drivers feature low propagation delay skew to maximize bit width and minimize emi. drivers have tri-st ate capability via the active-high de input. receiver data rate, cables and terminations the IL3522 is intended for networks up to 4,000 feet (1,200 m), but the maximum data rate decr eases as cable length increases. twisted pair cable should be used in all networks sin ce they tend to pick up noise and other elec tromagnetically induced voltages as common mode signals, which are effectively rejected by the differential receivers. fail-safe operation ?fail-safe operation? is defined here as the forcing of a logi c high state on the ?r? output in response to an open-circuit con dition between the ?a? and ?b? lines of the bus, or when no drivers are active on the bus. proper biasing can ensure fail-safe operati on, that is a known state when there are no active drivers on the bus. il3000-series isolated transceivers include internal pull-up and pul l-down resistors of approximately 30 k ? in the receiver section (r fs-int ; see figure below). these internal resistors are designed to ensure failsafe operation but only if there are no termination resistors. the entire v dd will appear between inputs ?a? and ?b? if there is no loading and no termination resistors, and there will be more than the required 200 mv with up to fou r rs-422 worst- case unit loads of 12 k ? . many designs operating below 1 mbps or less than 1,000 feet are unterminated. termin ation resistors may not be necessary for very low data rates and very short cable runs because reflections have time to settle before data sampling, which occurs at the middle of the bit interval. in busses with low-impedance termination re sistors, however, the differential voltage across the conductor pair will be close t o zero with no active drivers. in this case the state of th e bus is indeterminate, and the idle bus will be susceptible to noise. for example, with 120 ? termination resistors (r t ) on each end of the cable, and four unit loads (12 k ? each), without external fail-safe biasing resistors the internal pull-up and pull- down resistors will produce a voltage between inputs ?a? and ?b? of only about 5 mv. th is is not nearly enough to ensure a know n state. external fail-safe biasing resistors (r fs-ext ) at one end of the bus can ensure fail-safe operation with a terminated bus. resistors should be
IL3522 7 distributed by: rhopoint components www.rhopointcomponents.com email: sales@rhopointcomponents.com selected so that under worst-case power suppl y and resistor tolerances there is at l east 200 mv across the conductor pair with no active drivers to meet the input sensitivity specification of the rs-422 standard. using the same value for pull-up and pull-down biasing resistor s maintains balance for positive- and negative going transitions . lower-value resistors increase inactive noise immunity at the expense of quiescent power consumption. note that each unit load on the bus a dds a worst-case loading of 12 k ? across the conductor pair, and 32 unit loads add 375 ? worst-case loading. the more loads on the bus, the lower the required values of the biasing resistors. in the example with two 120 ? termination resistors and four unit loads, 560 ? external biasing resistors provide more than 200 mv between ?a? and ?b? with adequate margin for power supply variations an d resistor tolerances. this ensures a known state when there are no active drivers. other illustrative examples are shown in the table below. fail-safe biasing r b v dd 30k 30k gnd a 5 v r fs-ext r t r t r fs-ext r fs-int r fs-int fail-safe r t loading operation? none four unit loads (12 k ? ea.) 238 mv yes 120 ? four unit loads (12 k ? ea.) 5 mv no 560 ? 120 ? four unit loads (12 k ? ea.) 254 mv yes 510 ? 120 ? 32 unit loads (12 k ? ea.) 247 mv yes nominal v a-b (inactive) r fs-ext internal only internal only
IL3522 8 distributed by: rhopoint components www.rhopointcomponents.com email: sales@rhopointcomponents.com package drawings, dimensions and specifications 0.3" 16-pin soic package nom pin 1 identified by either an indent or a marked dot 0.287 (7.29) 0.300 (7.62) dimensions in inches (mm) 0.08 (2.0) 0.10 (2.5) 0.092 (2.34) 0.105 (2.67) 0.397 (10.08) 0.413 (10.50) 0.013 (0.3) 0.020 (0.5) 0.394 (10.00) 0.419 (10.64) 0.040 (1.0) 0.060 (1.5) 0.004 (0.1) 0.012 (0.3) 0.007 (0.2) 0.013 (0.3) 0.016 (0.4) 0.050 (1.3) ordering information and valid part numbers il 3522 e tr13 bulk packaging blank = tube tr13 = 13'' tape and reel package blank = 80/20 tin/lead plating e = rohs compliant base part number 3522 = rs-422 transceiver product family il = isolators valid part numbers IL3522 IL3522e IL3522tr13 IL3522e tr13 rohs compliant
IL3522 9 distributed by: rhopoint components www.rhopointcomponents.com email: sales@rhopointcomponents.com revision history isb-ds-001-IL3522- e september 2007 ? changed ordering information to reflect th at devices are now fully rohs compliant with no exemptions. isb-ds-001-IL3522-d august 2007 ? reorganized specif ication tables isb-ds-001-IL3522-c april 2007 ? eliminated soldering profile chart isb-ds-001-IL3522-b ? specified ?open? input condition in truth table ? added fail-safe biasing section. ? revised package drawing. isb-ds-001-IL3522-a initial release
IL3522 10 distributed by: rhopoint components www.rhopointcomponents.com email: sales@rhopointcomponents.com about nve nve is an iso 9001 certified company. nve corporation is a high technology components manufacturer havi ng the unique capability to combine leading edge giant magneto resistive (gmr) materials with integrated circuits to make high performance electronic components. products include magnetic field sensor s, magnetic field gradient sensors (gradiometer), dig ital magnetic field sensors, digital signal isolators and isolated bus transceivers. nve is a leader in gmr research and in 1994 introduced the wo rld?s first products using gmr ma terial, a line of gmr magnetic fi eld sensors that can be used for position, magnetic me dia, wheel speed and current sensing. nve is located in eden prairie, minneso ta, a suburb of minneapolis. please visit ou r web site at www.nve.com or call 952-829-92 17 for information on products, sales or distribution. nve corporation 11409 valley view road eden prairie, mn 55344-3617 usa telephone: (952) 829-9217 fax: (952) 829-9189 internet: www.nve.com e-mail: isoinfo@nve.com the information provided by nve corporation is believed to be accurate . however, no respons ibility is assumed by nve corporatio n for its use, nor for any infringement of pate nts, nor rights or licenses granted to third parties, which may re sult from its use. no license is granted by implication, or otherwis e, under any patent or patent right s of nve corporation. nve corpor ation does not authorize, nor warran t, any nve corporation product for use in life support devices or systems or other critical applications, without the express written appr oval of the president of nve corporation. specifications shown are subjec t to change without notice. isb-ds-001-IL3522-e september 2007
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