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1 fault protected, extended common mode range, rs-485/rs-422 transceivers with 16.5kv esd ISL32470E, isl32472e, isl32475e, isl32478e the ISL32470E, isl32472e, isl32475e, isl32478e are fault-protected, extended common mode range differential transceivers that exceed the rs-485 and rs-422 standards for balanced communication. the rs- 485 bus pins (driver outputs and receiver inputs) are fault protected against overvoltages up to 60v and are protected against 16.5kv esd strikes without latch-up. additionally, these transc eivers operate in environments with common mode voltages up to 15v (exceeds the rs-485 requirement), making this fault-protected rs-485 family one of the more robust on the market. transmitters (tx) deliver an except ional 2.5v (typical) differential output voltage into the rs-485 specified 54 ? load. this yields better noise immunity than standard rs-485 ics or allows up to six 120 ? terminations in star topologies. receiver (rx) inputs feature a ?full fail-safe? design, which ensures a logic high rx output if rx inputs are floating, shorted, or on a terminated but undriven (idle) bus. rx outputs feature high drive levels; typically, 15ma @ v ol = 1v (to ease the design of opto-coupled isolated interfaces). half duplex (rx inputs and tx outputs multiplexed together) and full duplex pinouts are available. see table 1 on page 2 for key features and configurations by device number. for a fault-protected rs-485 transceiver with a 25v extended common mode range, please see the isl32490e and isl32483e data sheets. features ? fault-protected rs-485 bus pins . . . . . . . . . . . . . . up to 60v ? extended common mode range . . . . . . . . . . . . . . . . . . . 15v larger than required for rs-485 ? 1/4 unit load for up to 128 devices on the bus ? 16.5kv hbm esd protection on rs-485 bus pins ? high transient over-voltage tolerance . . . . . . . . . . . . . . . 80v ? full fail-safe (open, short, terminated) rs-485 receivers ?high rx i ol for opto-couplers in isolated designs ? hot plug circuitry: tx and rx outputs remain three-state during power-up/power-down ? choice of rs-485 data rates . . . . . . . . . . . . 250kbps to 15mbps ? low quiescent supply current . . . . . . . . . . . . . . . . . . . 2.3ma ? ultra low shutdown supply current . . . . . . . . . . . . . . . . 10a applications ? utility meters/automated meter reading systems ?high node count rs-485 systems ?profibus ? and rs-485 based field bus networks, and factory automation ?security camera networks ? building lighting and environmental control systems ? industrial/process control networks figure 1. exceptional rx operates at >15mbps even with 15v common mode voltage figure 2. transceivers deli ver superior common mode range vs standard rs-485 devices time (20ns/div) voltage (v) -5 0 5 10 15 20 b v id = 1v a ro isl3247xe common mode range standard rs-485 transceiver -15 -7 0 12 15 january 21, 2011 fn7784.0 caution: these devices are sensitive to electrostatic discharge; follow proper ic handling procedures. 1-888-intersil or 1-888-468-3774 | copyright intersil americas inc. 2011. all rights reserved intersil (and design) is a trademark owned by intersil corporation or one of its subsidiaries. all other trademarks mentioned are the property of their respective owners.
ISL32470E, isl32472e, isl32475e, isl32478e 2 fn7784.0 january 21, 2011 table 1. summary of features part number half/full duplex data rate (mbps) slew-rate limited? en pins? hot plug? quiescent i cc (ma) low power shdn? pin count ISL32470E full 0.25 yes yes yes 2.3 yes 14 isl32472e half 0.25 yes yes yes 2.3 yes 8 isl32475e half 1 yes yes yes 2.3 yes 8 isl32478e half 15 no yes yes 2.3 yes 8 ordering information part number (notes 1, 2, 3) part marking temp. range (c) package (pb-free) pkg. dwg. # ISL32470Eibz isl32470 eibz -40 to +85 14 ld soic m14.15 isl32472eibz 32472 eibz -40 to +85 8 ld soic m8.15 isl32475eibz 32475 eibz -40 to +85 8 ld soic m8.15 isl32478eibz 32478 eibz -40 to +85 8 ld soic m8.15 notes: 1. add ?-t*? suffix for tape and reel. please refer to tb347 for details on reel specifications. 2. these intersil pb-free plastic packaged products employ spec ial pb-free material sets, molding compounds/die attach materials , and 100% matte tin plate plus anneal (e3 termination finish , which is rohs compliant and compatible wi th both snpb and pb-free soldering opera tions). intersil pb-free products are msl classified at pb-fr ee peak reflow temperatures that meet or exceed the pb-free requirements of ipc/jed ec j std-020. 3. for moisture sensitivity level (msl), please see device information pages for ISL32470E , isl32472e , isl32475e , isl32478e . for more information on msl please see techbrief tb363 . pin configurations isl32472e, isl32475e, isl32478e (8 ld soic) top view ISL32470E (14 ld soic) top view ro re de di 1 2 3 4 8 7 6 5 vcc b/z a/y gnd d r nc ro re de di gnd gnd vcc nc a b z y nc 1 2 3 4 5 6 7 14 13 12 11 10 9 8 d r
ISL32470E, isl32472e, isl32475e, isl32478e 3 fn7784.0 january 21, 2011 pin descriptions pin name 8 ld pin # 14 ld pin # function ro 1 2 receiver output. if a-b 10mv, ro is high; if a-b 200mv, ro is low; ro = high if a and b are unconnected (floating), shorted together, or connected to an undriven, terminated bus. re 2 3 receiver output enable. ro is enabled when re is low; ro is high impedance when re is high. internally pulled low. de 3 4 driver output enable. the driver outputs, y and z, are enab led by bringing de high. they are high impedance when de is low. internally pulled high. di 4 5 driver input. a low on di forces output y low and output z high. similarly, a high on di forces output y high and output z low. gnd 5 6, 7 ground connection. a/y 6 - 60v fault and 16.5kv hbm esd protected, rs-485/rs-422 level, non-inverting receiver input and non-inverting driver output. pin is an input if de = 0; pin is an output if de = 1. b/z 7 - 60v fault and 16.5kv hbm esd protected, rs-485/rs-422 level, inverting receiver input and inverting driver output. pin is an input if de = 0; pin is an output if de = 1. a - 12 60v fault and 15kv hbm esd protected, rs-485/rs-422 level, non-inverting receiver input. b - 11 60v fault and 15kv hbm esd protected, rs-485/rs-422 level, inverting receiver input. y - 9 60v fault and 15kv hbm esd protected, rs-485/rs-422 level, non-inverting driver output. z - 10 60v fault and 15kv hbm esd protected, rs-485/rs-422 level, inverting driver output. vcc 8 14 system power supply input (4.5v to 5.5v). nc - 1, 8, 13 no internal connection. truth tables transmitting inputs outputs re de di z y x1101 x1010 0 0 x high-z high-z 10xhigh-z (see note) high-z (see note) note: low power shutdown mode (see note 11, page 9). receiving inputs output re de half duplex de full duplex a-b ro 00 x -0.01v 1 00 x -0.2v 0 00 x inputs open/shorted 1 10 0 x high-z (see note) 11 1 x high-z note: low power shutdown mode (see note 11, page 9).
ISL32470E, isl32472e, isl32475e, isl32478e 4 fn7784.0 january 21, 2011 typical operating circuits ISL32470E full duplex example isl32472e, isl32475e, isl32478e half duplex example 0.1f + d r 12 11 10 9 13, 14 2 3 4 5 6, 7 v cc gnd ro re de di a b y z +5v 0.1f + d r 12 11 10 9 13, 14 2 3 4 5 6, 7 v cc gnd ro re de di a b y z +5v r t r t 0.1f + d r 7 6 8 1 2 3 4 5 v cc gnd ro re de di a/y b/z +5v 0.1f + d r 6 7 8 1 2 3 4 5 v cc gnd ro re de di a/y b/z +5v r t r t
ISL32470E, isl32472e, isl32475e, isl32478e 5 fn7784.0 january 21, 2011 absolute maximum rating s thermal information v cc to ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7v input voltages di, de, re . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3v to (v cc + 0.3v) input/output voltages a/y, b/z, a, b, y, z . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60v a/y, b/z, a, b, y, z (transient pulse through 100 , note 15). . . . . . . . . . . . . . . . . . . 80v ro . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3v to (v cc +0.3v) short circuit duration y, z . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . indefinite esd rating . . . . . . . . . . . . . . . . . . . . see ?esd performance? on page 6 latch-up (per jesd78, level 2, class a) . . . . . . . . . . . . . . . . . . . . . +125c thermal resistance (typical) ja (c/w) jc (c/w) 8 ld soic package (notes 4, 5) . . . . . . . . . . 116 47 14 ld soic package (notes 4, 5) . . . . . . . . . 88 39 maximum junction temperature (plastic package). . . . . . . . . . . . . . . . +150c maximum storage temperature range . . . . . . . . . . . . . .-65c to +150c pb-free reflow profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see link below http://www.intersil.com/ pbfree/pb-freereflow.asp recommended operating conditions supply voltage (v cc ). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5v temperature range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40c to +85c bus pin common mode voltage range. . . . . . . . . . . . . . . . . . -15v to +15v caution: do not operate at or near the maximum ratings listed for extended periods of time. exposure to such conditions may adv ersely impact product reliability and result in failures not covered by warranty. notes: 4. ja is measured with the component mounted on a high effective thermal conductivity test board in free air. see tech brief tb379 for details. 5. for jc , the ?case temp? location is taken at the package top center. electrical specifications test conditions: v cc = 4.5v to 5.5v; unless otherwise specified. typicals are v cc = 5v, t a = +25c (note 6). boldface limits apply over the operating temperature range, -40c to +85c. parameter symbol test conditions temp (c) min (note 14) typ max (note 14) units dc characteristics driver differential v out (no load) v od1 full - - v cc v driver differential v out (loaded, figure 3a) v od2 r l = 100 ? (rs-422) full 2.4 3.2 - v r l = 54 ? (rs-485) full 1.5 2.5 v cc v r l = 54 ? (profibus, v cc 5v) full 2.0 2.5 - r l = 21 ? (six 120 ? terminations for star configurations, v cc 4.75v) full 0.8 1.3 - v change in magnitude of driver differential v out for complementary output states v od r l = 54 ? or 100 ? (figure 3a) full - - 0.2 v driver differential v out with common mode load (figure 3b) v od3 r l = 60 ? , -7v v cm 12v full 1.5 2.1 v cc v r l = 60 ? , -15v v cm 15v (v cc 4.75v) full 1.7 2.3 - v driver common-mode v out (figure 3a) v oc r l = 54 ? or 100 ? full -1 - 3 v change in magnitude of driver common-mode v out for complementary output states v oc r l = 54 ? or 100 ? (figure 3a) full - - 0.2 v driver short-circuit current i osd de = v cc , -15v v o 15v (note 8) full -250 - 250 ma i osd1 at first foldback, 22v v o -22v full -83 - 83 ma i osd2 at second foldback, 35v v o -35v full -13 - 13 ma logic input high voltage v ih de, di, re full 2.5 -- v logic input low voltage v il de, di, re full - - 0.8 v logic input current i in1 di full -1 - 1 a de, re full -15 6 15 a
ISL32470E, isl32472e, isl32475e, isl32478e 6 fn7784.0 january 21, 2011 input/output current (a/y, b/z) i in2 de = 0v, v cc =0v or 5.5v v in = 12v full - 110 250 a v in = -7v full -200 -75 - a v in = 15v full -800 240 800 a v in = 60v (note 16) full -6 0.5 6 ma input current (a, b) (full duplex versions only) i in3 v cc = 0v or 5.5v v in = 12v full - 90 125 a v in = -7v full -100 -70 - a v in = 15v full -500 200 500 a v in = 60v (note 16) full -3 0.4 3 ma output leakage current (y, z) (full duplex versions only) i ozd re = 0v, de = 0v, v cc = 0v or 5.5v v in = 12v full - 20 200 a v in = -7v full -100 -5 - a v in = 15v full -500 40 500 a v in = 60v (note 16) full -3 0.1 3 ma receiver differential threshold voltage v th -15v v cm 15v full -200 -100 -10 mv receiver input hysteresis v th -15v v cm 15v 25 - 25 - mv receiver output high voltage v oh i o = -2ma, v id = -10mv full v cc - 0.5 4.75 - v i o = -8ma, v id = -10mv full 2.8 4.2 - v receiver output low voltage v ol i o = 6ma, v id = -200mv full - 0.27 0.4 v receiver output low current i ol v o = 1v, v id = -200mv full 15 22 - ma three-state (high impedance) receiver output current i ozr 0v v o v cc full -1 0.01 1 a receiver short-circuit current i osr 0v v o v cc full 12 - 110 ma supply current no-load supply current (note 7) i cc de = v cc , re =0v or v cc , di = 0v or v cc full - 2.3 4.5 ma shutdown supply current i shdn de = 0v, re = v cc , di = 0v or v cc full - 10 50 a esd performance rs-485 pins (a, y, b, z, a/y, b/z) human body model, from bus pins to gnd 1/2 duplex 25 - 16.5 - kv full duplex 25 - 15 - kv all pins human body model, per jedec 25 - 8 - kv machine model 25 - 700 - v driver switching characteristics (250kbps versions; ISL32470E and isl32472e) driver differential output delay t plh , t phl r d = 54 ? , c d = 50pf (figure 4) full - 320 450 ns driver differential output skew t skew r d = 54 ? , c d = 50pf (figure 4) full - 6 30 ns driver differential rise or fall time t r , t f r d = 54 ? , c d = 50pf (figure 4) full 400 650 1200 ns electrical specifications test conditions: v cc = 4.5v to 5.5v; unless otherwise specified. typicals are v cc = 5v, t a = +25c (note 6). boldface limits apply over the operating temperature range, -40c to +85c. (continued) parameter symbol test conditions temp (c) min (note 14) typ max (note 14) units
ISL32470E, isl32472e, isl32475e, isl32478e 7 fn7784.0 january 21, 2011 maximum data rate f max c d = 820pf (figure 6) full 0.25 1.5 - mbps driver enable to output high t zh sw = gnd (figure 5), (note 9) full - - 1200 ns driver enable to output low t zl sw = v cc (figure 5), (note 9) full - - 1200 ns driver disable from output low t lz sw = v cc (figure 5) full - - 120 ns driver disable from output high t hz sw = gnd (figure 5) full - - 120 ns time to shutdown t shdn (note 11) full 60 160 600 ns driver enable from shutdown to output high t zh(shdn) sw = gnd (figure 5), (notes 11, 12) full - - 2500 ns driver enable from shutdown to output low t zl(shdn) sw = v cc (figure 5), (notes 11, 12) full - - 2500 ns driver switching characteristics (1mbps versions; isl32475e) driver differential output delay t plh , t phl r d = 54 ? , c d = 50pf (figure 4) full - 70 125 ns driver differential output skew t skew r d = 54 ? , c d = 50pf (figure 4) full - 4.5 15 ns driver differential rise or fall time t r , t f r d = 54 ? , c d = 50pf (figure 4) full 70 170 300 ns maximum data rate f max c d = 820pf (figure 6) full 1 4-mbps driver enable to output high t zh sw = gnd (figure 5), (note 9) full - - 350 ns driver enable to output low t zl sw = v cc (figure 5), (note 9) full - - 300 ns driver disable from output low t lz sw = v cc (figure 5) full - - 120 ns driver disable from output high t hz sw = gnd (figure 5) full - - 120 ns time to shutdown t shdn (note 11) full 60 160 600 ns driver enable from shutdown to output high t zh(shdn) sw = gnd (figure 5), (notes 11, 12) full - - 2000 ns driver enable from shutdown to output low t zl(shdn) sw = v cc (figure 5), (notes 11, 12) full - - 2000 ns driver switching characteristics (15mbps versions; isl32478e) driver differential output delay t plh , t phl r d = 54 ? , c d = 50pf (figure 4) full - 21 45 ns driver differential output skew t skew r d = 54 ? , c d = 50pf (figure 4) full - 3 6 ns driver differential rise or fall time t r , t f r d = 54 ? , c d = 50pf (figure 4) full 5 17 30 ns maximum data rate f max c d = 470pf (figure 6) full 15 25 - mbps driver enable to output high t zh sw = gnd (figure 5), (note 9) full - - 100 ns driver enable to output low t zl sw = v cc (figure 5), (note 9) full - - 100 ns driver disable from output low t lz sw = v cc (figure 5) full - - 120 ns driver disable from output high t hz sw = gnd (figure 5) full - - 120 ns time to shutdown t shdn (note 11) full 60 160 600 ns driver enable from shutdown to output high t zh(shdn) sw = gnd (figure 5), (notes 11, 12) full - - 2000 ns driver enable from shutdown to output low t zl(shdn) sw = v cc (figure 5), (notes 11, 12) full - - 2000 ns electrical specifications test conditions: v cc = 4.5v to 5.5v; unless otherwise specified. typicals are v cc = 5v, t a = +25c (note 6). boldface limits apply over the operating temperature range, -40c to +85c. (continued) parameter symbol test conditions temp (c) min (note 14) typ max (note 14) units
ISL32470E, isl32472e, isl32475e, isl32478e 8 fn7784.0 january 21, 2011 receiver switching characteristics (250kbps versions; ISL32470E and isl32472e) maximum data rate f max (figure 7) full 0.25 5-mbps receiver input to output delay t plh , t phl (figure 7) full - 200 280 ns receiver skew |tplh - tphl| t skd (figure 7) full - 4 10 ns receiver enable to output low t zl r l = 1k ? , c l = 15pf, sw = v cc (figure 8), (note 10) full - - 50 ns receiver enable to output high t zh r l = 1k ? , c l = 15pf, sw = gnd (figure 8), (note 10) full - - 50 ns receiver disable from output low t lz r l = 1k ? , c l = 15pf, sw = v cc (figure 8) full - - 50 ns receiver disable from output high t hz r l = 1k ? , c l = 15pf, sw = gnd (figure 8) full - - 50 ns time to shutdown t shdn (note 11) full 60 160 600 ns receiver enable from shutdown to output high t zh(shdn) r l = 1k ? , c l = 15pf, sw = gnd (figure 8), (notes 11, 13) full - - 2000 ns receiver enable from shutdown to output low t zl(shdn) r l = 1k ? , c l = 15pf, sw = v cc (figure 8), (notes 11, 13) full - - 2000 ns receiver switching characteristics (1mbps versions; isl32475e) maximum data rate f max (figure 7) full 1 15 - mbps receiver input to output delay t plh , t phl (figure 7) full - 90 150 ns receiver skew |t plh - tph| t skd (figure 7) full - 4 10 ns receiver enable to output low t zl r l = 1k ? , c l = 15pf, sw = v cc (figure 8), (note 10) full - - 50 ns receiver enable to output high t zh r l = 1k ? , c l = 15pf, sw = gnd (figure 8), (note 10) full - - 50 ns receiver disable from output low t lz r l = 1k ? , c l = 15pf, sw = v cc (figure 8) full - - 50 ns receiver disable from output high t hz r l = 1k ? , c l = 15pf, sw = gnd (figure 8) full - - 50 ns time to shutdown t shdn (note 11) full 60 160 600 ns receiver enable from shutdown to output high t zh(shdn) r l = 1k ? , c l = 15pf, sw = gnd (figure 8), (notes 11, 13) full - - 2000 ns receiver enable from shutdown to output low t zl(shdn) r l = 1k ? , c l = 15pf, sw = v cc (figure 8), (notes 11, 13) full - - 2000 ns receiver switching characteristics (15mbps versions; isl32478e) maximum data rate f max (figure 7) full 15 25 - mbps receiver input to output delay t plh , t phl (figure 7) full - 35 70 ns receiver skew |t plh - t phl |t skd (figure 7) full - 4 10 ns receiver enable to output low t zl r l = 1k ? , c l = 15pf, sw = v cc (figure 8), (note 10) full - - 50 ns receiver enable to output high t zh r l = 1k ? , c l = 15pf, sw = gnd (figure 8), (note 10) full - - 50 ns receiver disable from output low t lz r l = 1k ? , c l = 15pf, sw = v cc (figure 8) full - - 50 ns receiver disable from output high t hz r l = 1k ? , c l = 15pf, sw = gnd (figure 8) full - - 50 ns electrical specifications test conditions: v cc = 4.5v to 5.5v; unless otherwise specified. typicals are v cc = 5v, t a = +25c (note 6). boldface limits apply over the operating temperature range, -40c to +85c. (continued) parameter symbol test conditions temp (c) min (note 14) typ max (note 14) units
ISL32470E, isl32472e, isl32475e, isl32478e 9 fn7784.0 january 21, 2011 time to shutdown t shdn (note 11) full 60 160 600 ns receiver enable from shutdown to output high t zh(shdn) r l = 1k ? , c l = 15pf, sw = gnd (figure 8), (notes 11, 13) full - - 2000 ns receiver enable from shutdown to output low t zl(shdn) r l = 1k ? , c l = 15pf, sw = v cc (figure 8), (notes 11, 13) full - - 2000 ns notes: 6. all currents into device pins are positive; all currents out of device pins are negative. all voltages are referenced to devi ce ground unless otherwise specified. 7. supply current specification is valid for loaded drivers when de = 0v. 8. applies to peak current. see ?typical performance curves? beginning on page 13 for more information. 9. keep re = 0 to prevent the device from entering shdn. 10. the re signal high time must be short enough (typically <100ns) to prevent the device from entering shdn. 11. transceivers are put into shutdown by bringing re high and de low. if the inputs are in this state for less than 60ns, the parts are guaranteed not to enter shutdown. if the inputs are in this state for at least 600n s, the parts are guaranteed to have entered shutdown. see ?low power shutdown mode? on page 13. 12. keep re = v cc , and set the de signal low time >600ns to ensure that the device enters shdn. 13. set the re signal high time >600ns to ensure that the device enters shdn. 14. compliance to data sheet limits is as sured by one or more methods: production test, characterization and/or design. 15. tested according to tia/ei a-485-a, section 4.2.6 (80v for 15s at a 1% duty cycle). 16. see ?caution? statement below the ?recommended operating conditions? section on page 5. test circuits and waveforms figure 3a. v od and v oc figure 3b. v od and v oc with common mode load figure 3. dc driver test circuits electrical specifications test conditions: v cc = 4.5v to 5.5v; unless otherwise specified. typicals are v cc = 5v, t a = +25c (note 6). boldface limits apply over the operating temperature range, -40c to +85c. (continued) parameter symbol test conditions temp (c) min (note 14) typ max (note 14) units d de di v cc v od v oc r l /2 r l /2 z y d de di v cc v od 375 ? 375 ? z y v cm r l /2 r l /2 v oc
ISL32470E, isl32472e, isl32475e, isl32478e 10 fn7784.0 january 21, 2011 figure 4a. test circuit figure 4b. measurement points figure 4. driver propagation delay and differential transition times figure 5a. test circuit figure 5b. measurement points figure 5. driver enable and disable times figure 6a. test circuit figure 6b. measurement points figure 6. driver data rate test circuits and waveforms (continued) d de di v cc signal generator r d z y c d out (z) 0v 1.5v 1.5v v oh v ol out (y) t plh t phl diff out (y - z) t r +v od -v od 90% 90% t f 10% 10% di skew = |t plh - t phl | 3v parameter output re di sw c l (pf) t hz y/z x 1/0 gnd 50 t lz y/z x 0/1 v cc 50 t zh y/z 0 (note 9) 1/0 gnd 100 t zl y/z 0 (note 9) 0/1 v cc 100 t zh(shdn) y/z 1 (note 12) 1/0 gnd 100 t zl(shdn) y/z 1 (note 12) 0/1 v cc 100 d de di z y v cc gnd sw signal generator 110 ? c l out (y, z) 0v 1.5v 1.5v v oh 0v v oh - 0.5v t hz out (y, z) v cc v ol v ol + 0.5v t lz de output low t zl , t zl(shdn) t zh , t zh(shdn) 2.3v 2.3v 3v (note 11) (note 11) (note 11) output high d de di v cc signal generator z y c d v od + - 54 ? 0v diff out (y - z) +v od -v od di 0v 3v
ISL32470E, isl32472e, isl32475e, isl32478e 11 fn7784.0 january 21, 2011 application information rs-485 and rs-422 are differential (balanced) data transmission standards used for long haul or noisy environments. rs-422 is a subset of rs-485, so rs-485 transceivers are also rs-422 compliant. rs-422 is a point-to-multipoint (multidrop) standard, which allows only one driver and up to 10 (assuming one-unit load devices) receivers on each bus. rs-485 is a true multipoint standard, which allows up to 32 one-unit load devices (any combination of drivers and receivers) on each bus. to allow for multipoint operation, the rs-485 specification requires that drivers must handle bus contention without sustaining any damage. another important advantage of rs-485 is the extended common mode range (cmr), which specifies that the driver outputs and receiver inputs withst and signals that range from +12v to -7v. rs-422 and rs-485 are intended for runs as long as 4000 feet; thus, the wide cmr is necessary to handle ground potential differences, as well as voltages induced in the cable by external fields. the ISL32470E, isl32472e, isl32475e, isl32478e is a family of ruggedized rs-485 transceivers that improves on the rs-485 basic requirements and therefore increases system reliability. the cmr increases to 15v, while the rs-485 bus pins (receiver inputs and driver outputs) include fault protection against voltages and transients up to 60v. additionally, larger-than-required differential output voltages (v od ) increase noise immunity, while the 16.5kv built-in esd protection comp lements the fault protection. receiver (rx) features these devices utilize a differential input receiver for maximum noise immunity and common mode rejection. input sensitivity is better than 200mv, as required by the rs-422 and rs-485 specifications. receiver input (load) current surpasses the rs-422 specification of 3ma and is four times lower than the rs-485 ?unit load (ul)? requirement of 1ma maximum. thus, these products are known as ?one-quarter ul? transc eivers, and there can be up to 128 of these devices on a network while still complying with the rs-485 loading specification. the rx functions with common mo de voltages as great as 15v, making them ideal for industrial or long networks where induced voltages are a realistic concern. all the receivers include a ?full fail- safe? function that guarantees a high-level receiver output if th e receiver inputs are unconnected (floating), shorted together, or conn ected to a terminated bus with all the transmitters disabled (i.e., an idle bus). rx outputs feature high drive levels (typically 22ma @ vol = 1v) to ease the design of optically coupled isolated interfaces. figure 7a. test circuit figure 7b. measurement points figure 7. receiver propagation delay and data rate figure 8a. test circuit figure 8b. measurement points figure 8. receiver enable and disable times test circuits and waveforms (continued) signal generator r ro re a b 15pf signal generator v cm ro 750mv -750mv t plh 0v 0v v cc 0v 50% 50% t phl a b parameter de a sw t hz 0 +1.5v gnd t lz 0 -1.5v v cc t zh (note 10) 0 +1.5v gnd t zl (note 10) 0 -1.5v v cc t zh(shdn) (note 13) 0 +1.5v gnd t zl(shdn) (note 13) 0 -1.5v v cc 1k ? gnd sw signal generator r ro re a b 15pf v cc ro 0v 1.5v 1.5v v oh 0v 1.5v v oh - 0.5v t hz ro v ol 1.5v v ol + 0.5v t lz re output low t zl , t zl(shdn) t zh , t zh(shdn) 3v v cc (note 11) (note 11) (note 11) output high
ISL32470E, isl32472e, isl32475e, isl32478e 12 fn7784.0 january 21, 2011 receivers easily meet the data rates supported by the corresponding driver, and all receiver outputs are three-statable via the active low re input. the rx in the 250kbps and 1mbps versions include noise filtering circuitry to reject high-frequency signals. the 1mbps version typically rejects pulses narrower than 50ns (equivalent to 20mbps), while the 250kbps rx rejects pulses below 150ns (6.7mbps). driver (tx) features the rs-485/rs-422 driver is a differential output device that delivers at least 1.5v across a 54 ? load (rs-485) and at least 2.4v across a 100 ? load (rs-422). the drivers feature low propagation delay skew to maximize bit width and to minimize emi, and all drivers are three-statable via the active high de input. the 250kbps and 1mbps driver outputs are slew rate limited to minimize emi and to minimize reflections in unterminated or improperly terminated networks. outputs of the isl32478e drivers are not limited; thus, faster output transition times allow data rates of at least 15mbps. high overvoltage (fault) protection increases ruggedness the 60v (referenced to the ic gnd) fault protection on the rs-485 pins makes these transceivers so me of the most rugged on the market. this level of protection makes the ISL32470E, isl32472e, isl32475e, isl32478e perfect for applications where power (e.g., 24v and 48v supplies) must be routed in the conduit with the data lines, or for outdoor applications where large transients are likely to occur. when power is routed with the data lines, even a momentary short between the supply and data lines will destroy an unprotected device. the 60v fault levels of this family are at least five times higher than the levels specified for standard rs-485 ics. the ISL32470E, isl32472e, isl32475e, isl32478e protection is active whether the tx is enabled or disabled, and even if the ic is powered down. if transients or voltages (includi ng overshoots and ringing) greater than 60v are possible, then additi onal external protection is required. wide common mode voltage (cmv) tolerance improves operating range rs-485 networks operating in indu strial complexes or over long distances are susceptible to large cmv variations. either of these operating environments may suffer from large node-to-node ground potential differences or cmv pickup from external electromagnetic sources, and devices with only th e minimum required +12v to -7v cmr may malfunction. the ISL32470E, isl32472e, isl32475e, isl32478e has extended 15v cmr, which allows for operation in environments that would over whelm lesser transceivers. additionally, the rx will not phase invert (erroneously change state), even with cmvs of 40v or differential voltages as large as 40v. high v od improves noise immunity and flexibility the ISL32470E, isl32472e, isl32475e, isl32478e driver design delivers larger differential output voltages (v od ) than the rs-485 standard requires or than most rs-485 transmitters can deliver. the typical 2.5v v od provides more noise immunity than networks built using many other transceivers. another advantage of the large v od is the ability to drive more than two bus terminations, which allows for utilizing the ISL32470E, isl32472e, isl32475e, isl32478e in ?star? and other multi-terminated, nonstandard networ k topologies. figure 10 details the transmitter?s v od vs i out characteristic and includes load lines for four (30 ? ) and six (20 ? ) 120 ? terminations. figure 10 shows that the driver typically delivers 1.3v into six terminations, and the ?electrical specifications? table guarantees a v od of 0.8v at 21 ? over the full temperature range. the rs-485 standard requires a minimum 1.5v v od into two terminations, but the ISL32470E, isl32472e, isl32475e, isl32478e delivers rs-485 voltage levels with two to three times the number of terminations. hot plug function when a piece of equipment powers up , there is a period of time in which the processor or asic drivin g the rs-485 control lines (de, re ) is unable to ensure that the rs-485 tx and rx outputs are kept disabled. if the equipment is connect ed to the bus, a driver activating prematurely during power-up may crash the bus. to avoid this scenario, the ISL32470E, isl32472e, isl32475e, isl32478e devices incorporate a ?hot plug? function. circuitry monitoring v cc ensures that, during power-up and power-down, the tx and rx outputs remain disabled, regardless of the state of de and re , if v cc is less than 3.5v. this gives the processor/asic a chance to stabilize and drive the rs-485 control lines to the proper states. figure 9 illustrates the power-up and power-down performance of the ISL32470E, isl32472e, isl32475e, isl32478e compared to an rs-485 ic without the hot plug feature. esd protection all pins on these devices include class 3 (>8kv) human body model (hbm) esd protection structures that are good enough to survive esd events commonly seen during manufacturing. even so, the rs-485 pins (driver outputs and receiver inputs) incorporate more advanced structures, which allows them to survive esd events in excess of 16.5kv hbm (15kv for full-duplex versions). the rs-485 pins are particularly vulnerable to esd strikes because they typically connect to an exposed port on the exterior of the finished product. simply touching the port pins, or connecting a cable, can cause an esd event that might destroy unprotected ics. these new esd structures protect the device whether or not it is powered up, figure 9. hot plug performance ( isl3247xe ) vs isl83088e without hot plug circuitry time v cc receiver output (v) driver y output (v) 2.5 5.0 2.5 5.0 v cc (v) r l = 1k ? ro 0 2.5 5.0 0 0 a/y r l = 1k ? 2.8v 3.5v isl3247xe isl3247xe re = gnd de, di = v cc isl83088e (40s/div)
ISL32470E, isl32472e, isl32475e, isl32478e 13 fn7784.0 january 21, 2011 and without interfering with the exceptional 15v cmr. this built-in esd protection minimizes the need for board-level protection structures (e.g., transient suppression diodes) and the associated, undesirable capacitive load they present. data rate, cables, and terminations rs-485/rs-422 are intended for network lengths up to 4000 feet, but the maximum system data rate decreases as the transmission length increases. devices operating at 15mbps may be used at lengths up to 150 feet (46m), but the distance can be increased to 328 feet (100m) by operating at 10mbps. the 1mbps versions can operate at full data rates with lengths up to 800 feet (244m). jitter is the limiting parameter at these fa ster data rates, so employing encoded data streams (e.g., manchester coded or return-to-zero) may allow increased transmission di stances. the slow versions can operate at 115kbps or less at the full 4000-foot (1220m) distance, or at 250kbps for lengths up to 3000 feet (915m). dc cable attenuation is the limiting parameter, so using better-quality cables (e.g., 22 awg) may allow increased transmission distance. twisted pair is the cable of choice for rs-485/rs-422 networks. twisted-pair cables tend to pick up noise and other electromagnetically induced voltages as common mode signals, which are effectively rejected by th e differential receivers in these ics. proper termination is imperative, when using the 15mbps devices, to minimize reflections. short networks using the 250kbps versions need not be terminated; however, terminations are recommended unless power dissipation is an overriding concern. in point-to-point or point-to-multi point (single driver on bus like rs-422) networks, the main cable should be terminated in its characteristic impedance (typically 120 ? ) at the end farthest from the driver. in multi-receiver appl ications, stubs connecting receivers to the main cable should be kept as short as possible. multipoint (multi-driver) systems re quire that the main cable be terminated in its characteristic impedance at both ends. stubs connecting a transceiver to the main cable should be kept as short as possible. built-in driver overload protection as stated previously, the rs-485 specification requires that drivers survive worst-case bus contention s undamaged. these transceivers meet this requirement via driver output short circuit current limits and on-chip thermal shutdown circuitry. the driver output stages incorporat e a double foldback short circuit current limiting scheme, which ensure s that the output current never exceeds the rs-485 specification, even at the common mode and fault condition voltage range extremes. the first foldback current level ( 70ma) is set to ensure that the driver never folds back when driving loads with common mode voltages up to 15v. the very low second foldback current setting ( 9ma) minimizes power dissipation if the tx is enabled when a fault occurs. in the event of a major short circuit condition, devices also include a thermal shutdown feature that disa bles the drivers whenever the die temperature becomes excessive. this eliminates the power dissipation, allowing the die to cool. the drivers automatically re-enable after the die temperat ure drops by about 15c. if the contention persists, the thermal shutdown/re-enable cycle repeats until the fault is cleared. receivers stay operational during thermal shutdown. low power shutdown mode these bicmos transceivers all use a fraction of the power required by competitive devices, but they al so include a shutdown feature that reduces the already low quiescent i cc to a 10a trickle. these devices enter shutdown whenever the receiver and driver are simultaneously disabled (re =v cc and de = gnd) for a period of at least 600ns. disabling both the driver and the receiver for less than 60ns guarantees that the transceiver will not enter shutdown. note that receiver and driver enable times increase when the transceiver enables from shutdown. refer to notes 9, 10, 11, 12 and 13 on page 9, at the end of the ?e lectrical specifications? table, for more information. typical performance curves v cc = 5v, t a = +25c; unless otherwise specified. figure 10. driver output curr ent vs differential output voltage figure 11. driver differential output voltage vs temperature differential output voltage (v) driver output current (ma) 012345 0 10 20 30 40 50 60 70 80 90 +25c r d = 54 ? r d = 100 ? r d = 30 ? r d = 20 ? +85c -40 0 50 85 temperature (c) differential output voltage (v) -25 25 75 r d = 54 ? r d = 100 ? 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6
ISL32470E, isl32472e, isl32475e, isl32478e 14 fn7784.0 january 21, 2011 figure 12. supply current vs temperature figure 13 . receiver output curren t vs receiver output voltage figure 14. driver output current vs short circuit vo ltage figure 15. bus pin current vs bus pin voltage figure 16. driver differential propagation delay vs temperature (ISL32470E, isl32472e) figure 17. driver differential skew vs temperature (ISL32470E, isl32472e) typical performance curves v cc = 5v, t a = +25c; unless otherwise specified. (continued) -40 0 50 85 temperature (c) icc (ma) -25 25 75 2.00 2.05 2.10 2.15 2.20 2.25 2.30 2.35 2.40 2.45 de = v cc , re = x de = gnd, re = gnd receiver output voltage (v) receiver output current (ma) -30 -20 -10 0 10 20 30 40 50 60 70 v oh , +25c v oh , +85c v ol , +25c v ol , +85c 012345 output voltage (v) output current (ma) -150 -100 -50 0 50 100 150 -60-50-40-30-20-10 0 102030405060 y or z = high y or z = low +85c +85c +25c +25c bus pin voltage (v) bus pin current (a) -600 -400 -200 0 200 400 600 800 -70 -50 -30 -10 0 10 30 50 70 a/y or b/z y or z -40 0 50 85 temperature (c) -25 25 75 propagation delay (ns) t plh t phl 300 305 310 315 320 325 330 335 340 r d = 54 ? , c d = 50pf -40 0 50 85 temperature (c) skew (ns) -25 25 75 |t plh - t phl | 0 1 2 3 4 5 6 7 8 r d = 54 ? , c d = 50pf
ISL32470E, isl32472e, isl32475e, isl32478e 15 fn7784.0 january 21, 2011 figure 18. driver differential propagation delay vs temperature (isl32475e) figure 19. driver differential skew vs temperature (isl32475e) figure 20. driver differential propagation delay vs temperature (isl32478e) figure 21. driver differenti al skew vs temperature (isl32478e) figure 22. receiver performance with 15v cmv (ISL32470E, isl32472e) figure 23. receiver performance with 15v cmv (isl32475e) typical performance curves v cc = 5v, t a = +25c; unless otherwise specified. (continued) -40 0 50 85 temperature (c) -25 25 75 propagation delay (ns) 50 55 60 65 70 75 80 85 t plh t phl r d = 54 ? , c d = 50pf -40 0 50 85 temperature (c) skew (ns) -25 25 75 2.0 2.5 3.0 3.5 4.0 |t plh - t phl | r d = 54 ? , c d = 50pf -40 0 50 85 temperature (c) -25 25 75 propagation delay (ns) 15 17 19 21 23 25 27 t plh t phl r d = 54 ? , c d = 50pf -40 0 50 85 temperature (c) skew (ns) -25 25 75 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 |t plh - t phl | r d = 54 ? , c d = 50pf time (1s/div) voltage (v) ro a b ro a b 0 5 10 15 -15 -10 -5 0 5 v id = 1v time (400ns/div) voltage (v) ro a b ro a b 0 5 10 15 -15 -10 -5 0 5 v id = 1v
ISL32470E, isl32472e, isl32475e, isl32478e 16 fn7784.0 january 21, 2011 figure 24. receiver performance with 15v cmv (isl32478e) figure 25. driver and receiver waveforms (ISL32470E, isl32472e) figure 26. driver and receiv er waveforms (isl32475e) figure 27. driver and receiv er waveforms (isl32478e) die characteristics substrate potential (powered up): gnd process: si gate bicmos typical performance curves v cc = 5v, t a = +25c; unless otherwise specified. (continued) time (20ns/div) voltage (v) ro a b ro a b 0 5 10 15 -15 -10 -5 0 5 v id = 1v time (1s/div) receiver output (v) r d = 54 ? , c d = 50pf 0 5 driver output (v) 0 5 driver input (v) di ro a/y - b/z -3 -2 -1 0 1 2 3 time (400ns/div) receiver output (v) r d = 54 ? , c d = 50pf 0 5 driver output (v) 0 5 driver input (v) di ro a/y - b/z -3 -2 -1 0 1 2 3 time (20ns/div) receiver output (v) r d = 54 ? , c d = 50pf 0 5 driver output (v) 0 5 driver input (v) di ro a/y - b/z -3 -2 -1 0 1 2 3
ISL32470E, isl32472e, isl32475e, isl32478e 17 intersil products are manufactured, assembled and tested utilizing iso9000 quality systems as noted in the quality certifications found at www.intersil.com/design/quality intersil products are sold by description only. intersil corporat ion reserves the right to make changes in circuit design, soft ware and/or specifications at any time without notice. accordingly, the reader is cautioned to verify that data sheets are current before placing orders. information furnished by intersil is believed to be accurate and reliable. however, no responsi bility is assumed by intersil or its subsid iaries for its use; nor for any infringem ents of patents or other rights of third parties which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of i ntersil or its subsidiaries. for information regarding intersil corporation and its products, see www.intersil.com fn7784.0 january 21, 2011 for additional products, see www.intersil.com/product_tree products intersil corporation is a leader in the design and manufacture of high-performance analog semiconductors. the company's product s address some of the industry's fastest growing markets, such as, flat panel displays, cell phones, handheld products, and notebooks. in tersil's product families address power management and analog signal processing functions. go to www.intersil.com/products for a complete list of intersil product families. *for a complete listing of applications, related documentation an d related parts, please see the respective device information page on intersil.com: ISL32470E , isl32472e , isl32475e , isl32478e . to report errors or suggestions for this data sheet, please go to www.intersil.com/ask our staff fits are available from our web site at http://rel.intersil.co m/reports/search.php revision history the revision history provided is for inform ational purposes only and is believed to be accurate, but not warranted. please go t o web to make sure you have the latest rev. date revision change january 21, 2011 fn7784.0 initial release
ISL32470E, isl32472e, isl32475e, isl32478e 18 fn7784.0 january 21, 2011 package outline drawing m14.15 14 lead narrow body small outline plastic package rev 1, 10/09 a d 4 0.25 a-b mc c 0.10 c 5 b d 3 0.10 a-b c 4 0.20 c 2x 2x 0.10 d c 2x h 0.10 c 6 3 6 id mark pin no.1 (0.35) x 45 seating plane gauge plane 0.25 (5.40) (1.50) 1.27 0.31-0.51 4 4 detail"a" 0.220.03 0.10-0.25 1.25 min 1.75 max (1.27) (0.6) 6.0 8.65 3.9 7 14 8 dimensioning and tolerancing conform to amsey14.5m-1994. dimension does not include interlead flash or protrusions. dimensions in ( ) for reference only. interlead flash or protrusions shall not exceed 0.25mm per side. datums a and b to be determined at datum h. 4. 5. 3. 2. dimensions are in millimeters. notes: 1. the pin #1 indentifier may be either a mold or mark feature. 6. does not include dambar protrusion. allowable dambar protrusion 7. reference to jedec ms-012-ab. shall be 0.10mm total in excess of lead width at maximum condition. detail "a" side view typical recommended land pattern top view
ISL32470E, isl32472e, isl32475e, isl32478e 19 fn7784.0 january 21, 2011 package outline drawing m8.15 8 lead narrow body small outline plastic package rev 2, 11/10 detail "a" top view index area 123 -c- seating plane x 45 notes: 1. dimensioning and tolerancing per ansi y14.5m-1982. 2. package length does not include mold flash, protrusions or gate burrs. mold flash, protrusion and gate burrs shall not exceed 0.15mm (0.006 inch) per side. 3. package width does not include interlead flash or protrusions. interlead flash and protrusions shall not exceed 0.25mm (0.010 inch) per side. 4. the chamfer on the body is optional. if it is not present, a visual index fea- ture must be located with in the crosshatched area. 5. terminal numbers are shown for reference only. 6. the lead width as measured 0.36mm (0.014 inch) or greater above the seat- ing plane, shall not exceed a maximum value of 0.61mm (0.024 inch). 7. controlling dimension: millimeter. co nverted inch dimensions are not necessarily exact. 8. this outline conforms to jedec publication ms-012-aa issue c. side view ?a side view ?b? 1.27 (0.050) 6.20 (0.244) 5.80 (0.228) 4.00 (0.157) 3.80 (0.150) 0.50 (0.20) 0.25 (0.01) 5.00 (0.197) 4.80 (0.189) 1.75 (0.069) 1.35 (0.053) 0.25(0.010) 0.10(0.004) 0.51(0.020) 0.33(0.013) 8 0 0.25 (0.010) 0.19 (0.008) 1.27 (0.050) 0.40 (0.016) 1.27 (0.050) 0.200 1 2 3 4 5 6 7 8 typical recommended land pattern 2.41 (0.095) 0.76 (0.030)

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