il3685 isoloop ? is a registered tradem ark of nve corporation. *u.s. patent number 5,831, 426; 6,300,617 and others. rev. g nve corporation 11409 valley view road, eden prairie, mn 55344-3617 phone: (952) 829-9217 fax: (952) 829-9189 www.isoloop.com ?nve corporation profibus-compatible isolated rs-485 interface functional diagram de d r re isode a b il3685 v id (a-b) de re r d mode 200 mv l l h x receive ? 200 mv l l l x receive 1.5 v h l h h drive ? 1.5 v h l l l drive x x h z x hi-z r open l l h x receive features ?? 3.3 / 5 v input supply compatible ?? 2500 v rms isolation (1 minute) ?? 20 ns propagation delay ?? 40 mbps data rate ?? 5 ns pulse skew ?? 20 kv/ s transient immunity ?? 15 kv bus esd protection ?? low emc footprint ?? thermal shutdown protection ?? ? 40c to +85c temperature range ?? meets or exceeds ansi rs-485 and iso 8482:1987(e) ?? profibus compliant ?? 16-pin soic package ?? iec 61010-2001 approved; ul 1577 approval pending applications ?? security networks ?? profibus dp and fms networks ?? building environmental controls ?? industrial control networks ?? gaming systems ?? factory automation description the il3685 is a galvanically is olated, high-speed differential bus transceiver, designed for bidirectional data communication on balanced transmission lines. the device uses nve?s patented* isoloop spintronic giant magnetoresistance (gmr) technology. the il3685 is fully profibus compliant, including the rigorous profibus differential output voltage specifications. the device is compatible with 3.3 v as well as 5 v input supplies, allowing interface to standard mi crocontrollers 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.
il3685 2 nve corporation 11409 valley vi ew road, eden prai rie, mn 55344-3617 phone: (952) 829-9217 fax: (952) 829-9189 www.isoloop.com ?2007 nve corporation 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 a or b bus pins ? 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 esd (all bus nodes) 15 kv hbm 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 signal 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 (pending) tuv certificate numbers: n1502812, n1502812-101 classification: reinforced insulation model package pollution degree material group max. working voltage il3685 soic (0.3 " ) ii iii 300 v rms ul 1577 (pending) component recognition program file number: e207481 rated 2500v rms for 1 minute soldering profile per jedec j-std-020c, msl=2
il3685 3 nve corporation 11409 valley vi ew road, eden prai rie, mn 55344-3617 phone: (952) 829-9217 fax: (952) 829-9189 www.isoloop.com ?2007 nve corporation pin connections 1 v dd1 input power supply 2 gnd 1 input power supply ground return (pin 2 is internally connected to pin 8) 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 (pin 8 is internally connected to pin 2) 9 gnd 2 output power supply ground return (pin 9 is internally connected to pin 15) 10 isode isolated de output for use in profibus applications where the state of the isolated drive enable node needs to be monitored 11 nc no internal connection 12 a non-inverting bus line 13 b inverting bus line 14 nc no internal connection 15 gnd 2 output power supply ground return (pin 15 is internally connected to pin 9) 16 v dd2 output power supply re vdd 2 gnd 1 d gnd 2 r nc b de a nc isode gnd 1 vdd 1 gnd 2 nc
il3685 4 nve corporation 11409 valley vi ew road, eden prai rie, mn 55344-3617 phone: (952) 829-9217 fax: (952) 829-9189 www.isoloop.com ?2007 nve corporation 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 output voltage v o v dd v i o = 0 differential output voltage (2) |v od 1 | v dd v i o = 0 differential output voltage (2) |v od 2 | 2.1 3 3.5 v r l = 54 ? differential output voltage (2)(6) v od 3 1.9 3.5 v r l = 60 ? 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 voltages are with respect to netw ork ground except differential i/o bus voltages. 2. differential input/output voltage is measured at the noninver ting 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 ansi standard eia/tia-422-b applies to disabled outputs 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 in put 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 condition. 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 propa gation 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 these conditions. it does not guarant ee performance. 12. the relevant test and measurement methods are given in the electromag netic compatibility section on p. 6. 13. external magnetic field immunity is improved by this factor if the field direction is ?end-to-end? rather than to ?pin-to-p in? (see diagram on p. 6).
il3685 5 nve corporation 11409 valley vi ew road, eden prai rie, mn 55344-3617 phone: (952) 829-9217 fax: (952) 829-9189 www.isoloop.com ?2007 nve corporation 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 v it + 0.2 v ? 7 v < v cm < 12 v negative-going input threshold voltage v it ? ? 0.2 v ? 7 v < v cm < 12 v hysteresis voltage (v it + ? v it ? ) v hys 28 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 20 30 ns v o = ? 1.5 to 1.5 v, c l = 15 pf pulse skew (2, 10) t sk (p) 1 5 ns v o = ? 1.5 to 1.5 v, c l = 15 pf skew limit (3) t sk (lim) 2 10 ns r l = 54 ? , c l = 50 pf output enable time to high level t pzh 15 30 ns c l = 15 pf output enable time to low level t pzl 15 30 ns c l = 15 pf output disable time from high level t phz 15 30 ns c l = 15 pf output disable time from low level t plz 15 30 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 25 35 ns v o = ? 1.5 to 1.5 v, c l = 15 pf pulse skew (2, 10) t sk (p) 2 5 ns v o = ? 1.5 to 1.5 v, c l = 15 pf skew limit (3) t sk (lim) 4 10 ns r l = 54 ? , c l = 50 pf output enable time to high level t pzh 17 30 ns c l = 15 pf output enable time to low level t pzl 17 30 ns c l = 15 pf output disable time from high level t phz 17 30 ns c l = 15 pf output disable time from low level t plz 17 30 ns c l = 15 pf magnetic field immunity (12) v dd1 = +5 v, v dd2 = +5 v power frequency magnetic immunity h pf 2800 3500 a/m 50hz/60hz pulse magnetic field immunity h pm 4000 4500 a/m t p = 8s damped oscillatory magnetic field h osc 4000 4500 a/m 0.1hz ? 1mhz cross-axis immunity multiplier (13) k x 2.5 v dd1 = +3.3 v, v dd2 = +5 v power frequency magnetic immunity h pf 1000 1500 a/m 50hz/60hz pulse magnetic field immunity h pm 1800 2000 a/m t p = 8s damped oscillatory magnetic field h osc 1800 2000 a/m 0.1hz ? 1mhz cross-axis immunity multiplier (13) k x 2.5
il3685 6 nve corporation 11409 valley view road eden prairie, mn 55344-3617 usa telephone: (952) 829-9217 fax (952) 829- 9189 internet: www.isoloop.com electrostatic discharge sensitivity this product has been tested for electrostatic sensitivity to the limits stated in the specifications. however, nve recommends that all integrated circuits be handled with appropriate care to avoid damage. dama ge caused by inappropriate handling or storage could range from performance degradation to complete failure. dynamic power consumption isoloop isolators achieve their low power c onsumption from the way 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 bridge causes the output comparator to switch following the input logic signal. since the current pulses are narrow, about 2.5 ns, the power consumption 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. data rate (mbps) i dd1 i dd2 1 150 a 150 a 10 1.5 ma 1.5 ma 20 3 ma 3 ma 40 6 ma 6 ma table 2. typical dynamic supply currents. power supply decoupling both v dd1 and v dd2 must be bypassed with 47 nf ceramic 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 il3685 incorporates a patented refresh circuit to maintain the co rrect output state with respect 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 minimize glitches caused by slow power-up and power-down transients is not required. electromagnetic compatibility the il3585 is fully compliant with generic emc standards en50081, en50082-1 and the umbrella line-voltage standard for informat ion technology equipment (ite) en61000. the isol oop isolator?s wheatstone bridge configuratio n and differential magnetic field sign aling ensure excellent emc performance against all relevant standards. nve conducted compliance tests in the categories below: en50081-1 residential, commercial & light industrial methods en55022, en55014 en50082-2: industrial environment methods en61000-4-2 (esd), en61000-4-3 (electromagne tic field immunity), en61000-4-4 (electrical transient immunity), en61000-4-6 (rfi immunity), en61000-4-8 (power frequency magne tic field immunity), en61000-4-9 (pulsed magnetic field), en61000-4-10 (damped osc illatory magnetic field) env50204 radiated field from digital telephones (immunity test) immunity to external magnetic fields is even higher if the field direction is ?end-to- end? (rather than to ?pin-to-pin?) as sho wn in the diagram at right. application information receiver features the receiver output ?r? has tri-state capability via the active low re input. driver features the rs-485 driver has a differential output a nd delivers at least 2.1 v across a 54 ? load. drivers feature low propagation delay skew to maximize bit width and minimize emi. drivers have tri-state capability via the active-high de input. receiver data rate, cables and terminations the il3685 is intended for networks up to 4,000 feet (1,200 m), but th e maximum data rate decreases as cable length increases. twisted pair cable should be used in all networks since they tend to pick up noise and other electromagnetically induced voltages as common mode signals, which are effectively rejected by the differential receiver.
il3685 7 nve corporation 11409 valley view road eden prairie, mn 55344-3617 usa telephone: (952) 829-9217 fax (952) 829- 9189 internet: www.isoloop.com fail-safe operation ?fail-safe operation? is defined here as the forcing of a logic 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 operation, that is, a known state when there are no active drivers on the bus. il3000-serie s isolated transceivers include internal pull-up and pull-dow n 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 four rs-485 worst- case unit loads of 12 k? . many designs operating below 1 mbps or less than 1,000 feet ar e unterminated. termination 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 o f the bit interval. in busses with low-impedance termination resistors however, the differential voltage across the conductor pair will be close to zero with no active drivers. in this case the state of the bus is indeterminate, and the idle bus will be susceptible to noise. for example, with 1 20 ? termination resistors (r t ) on each end of the cable, and four unit loads (12 k ? each), without external fail-safe biasin g resistors the internal pull-up and pull- down resistors will produce a voltage between inputs ?a? and ?b? of onl y about 5 mv. this is not near ly 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 opera tion with a terminated bus. resistors should be selected so that under worst-case power supply and resistor toleran ces there is at least 200 mv across the conductor pair with no active drivers to meet the input sensitivity specification of the rs-485 standard. using the same value for pull-up and pull-dow n biasing resistors maintains balance fo r positive- and negative going transitions . lower-value resistors increase inactive noise immunity at the expense of quies cent 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 provi de more than 200 mv between ?a? and ?b? with adequate margin for power s upply variations and resistor tolerances. th is 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 loadin g o p eration? 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 390 ? 220 ? profibus (iec61158-2) >200 mv yes nominal v a-b (inactive) r fs-ext internal only internal only
il3685 8 nve corporation 11409 valley view road eden prairie, mn 55344-3617 usa telephone: (952) 829-9217 fax (952) 829- 9189 internet: www.isoloop.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 (10.1) 0.413 (10.5) 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) pin spacing is a basic dimension; tolerances do not accumulate note: ordering information and valid part numbers il 3685 e tr13 bulk packaging blank = tube tr13 = 13'' tape and reel package e = rohs compliant base part number 3685 = profibus/rs-485 transceiver product family il = isolators valid part numbers il3585e il3585e tr13 rohs compliant
il3685 9 nve corporation 11409 valley view road eden prairie, mn 55344-3617 usa telephone: (952) 829-9217 fax (952) 829- 9189 internet: www.isoloop.com resion history isb-ds-001-il3685-g november 2010 change ?? added fail-safe resistor values for profibus to table on p. 7. isb-ds-001-il3685-f change ?? clarified pending ul 1577 approval. isb-ds-001-il3685-e change ?? added low emc footprint. isb-ds-001-il3685-d change ?? added bus-protection esd specification (15 kv). isb-ds-001-il3685-c change ?? added magnetic field immunity and electromagnetic compatibility specifications. ?? added note on package drawing that pin-sp acing tolerances are non-accumulating. isb-ds-001-il3685-b change ?? changed ordering information to reflect that de vices are now fully rohs compliant with no exemptions. isb-ds-001-il3685-a initial release
il3685 10 nve corporation 11409 valley view road eden prairie, mn 55344-3617 usa telephone: (952) 829-9217 fax (952) 829- 9189 internet: www.isoloop.com about nve an iso 9001 certified company nve corporation manufactures innovative products ba sed on unique spintronic giant magnetor esistive (gmr) technology. products i nclude magnetic field sensors, magnetic field gradient sensors (gradiometers), digital magnetic field sensors, digital signal isolator s, and isolated bus transceivers. nve pioneered spintronics and in 1994 introduced the world?s firs t products using gmr material, a line of ultra-precise magneti c sensors for position, magnetic media, gear speed and current sensing. 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 corporati on is believed to be accurate. however, no responsibility is assumed by nve corporatio n for its use, nor for any infringement of patents, nor rights or licenses grant ed to third parties, which may result from its use. no license is granted by implication, or otherwise, under any patent or patent rights of nve corporation. nve co rporation does not authorize, nor warran t, any nve corporation product for use in life support devices or systems or other critical ap plications, without the express written appr oval of the president of nve corporation. specifications are subject to change without notice. isb-ds-001-il3685-g november 2010
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