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exar corporation 48720 kato road, fremont ca, 94538 ? (510) 668-7000 ? fax (510) 668-7017 ? www.exar.com xr5486e-5488e ultra high speed rs-485/rs-422 profibus transceivers with 1/8th unit load and +/-15kv esd-protection october 2010 rev. 1.0.0 general description the xr5486e-xr5488e family of rs-485 devices are designed for reliable, bidirectional communication on multipoint bus transm ission lines. each device contains one differential driver and one differential receiver. xr5488e is a half-duplex device while the other part numbers are full- duplex. all devices comply with tia/eia-485 and tia/ei a-422 standards. lead- free and rohs compliant packages are available for all models. these devices are ruggedized for use in harsh operating conditions over the entire common mode voltage range from -7v to +12v. receivers are specially designed to fail-safe to a logic high output state if the inputs are left un-driven or shorted. all rs- 485 bus-pins are protected against severe esd events up to +/-15kv air-gap (iec-61000-4-2), up to +/-8kv contact discharge (iec-61000-4-2) and up to +/-15kv human body model. drivers are protected from excess current flow caused by bus contention or output short-circuits by both an internal current limit and a thermal-overload shutdown. devices are rated for industrial (-40c to +85c) operating temperatures. receivers have exceptionally high input impedance, which places only 1/8th the standard load on a bus. up to 256 transceivers may coexist while preserving full signal margin. all devices operate from a single 5.0v power supply and draw negligible quiescent power. all versions except the XR5487E may independently enable and disable their driver and receiver and enter a low power shutdown mode if both driver and receiver are disabled. all outputs maintain high impedance in shutdown or when powered-off. features ? 5.0v single supply operation ? high speed up to 52mbps ? advanced fail-safe receiver inputs ? hot swap glitch protection on control inputs ? robust esd protection for rs-485 pins +/-15kv air-gap discharge +/-15kv human body model +/-8kv contact discharge ? 1/8th unit load, 256 transceivers on bus ? driver short circuit cu rrent limit and thermal shutdown for overload protection ? low current 1 a shutdown mode (except XR5487E) ? industry standard package footprints typical applications ? motor control ? building automation ? security systems ? remote utility meter reading f igure 1. t ypical a pplication c ircuit r t r t stub xr5488e xr5488e xr5488e xr5488e a aa a b bb b di ro re de de de de re re di di di ro ro ro re
f igure 2. p in o ut a ssignment nc nc vcc 2 1 3 4 5 6 78 9 10 11 12 13 14 di nc ro re de gnd gnd y z b a 2 1 3 4 5 6 7 8 vcc ro di gnd a b z y 2 1 3 45 6 7 8 8-pin nsoic half duplex xr5488e ro re de di gnd a b vcc 8-pin nsoic full duplex XR5487E 14-pin nsoic full duplex xr5486e ordering information p art n umber p ackage o perating t emperature r ange d evice s tatus xr5486eid-f 14-pin narrow soic -40c to +85c active XR5487Eid-f 8-pin narrow soic -40c to +85c active xr5488eid-f 8-pin narrow soic -40c to +85c active xr5486e-5488e 2 ultra high speed rs-485/rs-422 profibus transceivers with 1/8th unit load and +/-15kv esd-protection rev. 1.0.0 note: to order tape and reel option include "/tr" in ordering part number. all packages are pb-free/ rohs compliant.
xr5486e-5488e 3 rev. 1.0.0 ultra high speed rs-485/rs-422 profibus transceiv ers with 1/8th unit load and +/-15kv esd-protection pin descriptions pin assignments p in n umber p in n ame t ype d escription h alf d uplex f ull d uplex 1 2 2 ro o receiver output. when re is low and if (a- b) -50mv, ro is high. if (a-b) -200mv, ro is low. 2 - 3 re i receiver output enable. when re is low, ro is enabled. when re is high, ro is high impedance. re should be high and de should be low to enter shutdown mode. re is a hot-swap input. 3 - 4 de i driver output enable. when de is high, outputs are enabled. when de is low, out - puts are high impedance. de should be low and re should be high to enter shutdown mode. de is a hot-swap input. 4 3 5 di i driver input. with de high, a low level on di forces non-inverting output low and invert - ing output high. similarly, a high level on di forces non-inverting output high and invert - ing output low. 5 4 6, 7 gnd pwr ground. 6 - - a o non-inverting receiver input and non- inverting driver output. 7 - - b o inverting receiver input and inverting driver output. 8 1 14 vcc pwr +5.0v power supply input. bypass with 0.1uf capacitor. - 8 12 a i non-inverting receiver input. - 7 11 b i inverting receiver input. - 5 9 y o non-inverting driver output. - 6 10 z o inverting driver output. - - 1, 8, 13 nc - no connect, not internally connected. pin type: i=input, o=output. xr5488e XR5487E xr5486e
absolute maximum ratings these are stress ratings only and functional operation of the dev ice at these ratings or any other above those indicated in the operation sections to the specifications below is not implied. ex posure to absolute maximum rating conditions for extended periods of time may affect re liability and cause permanent damage to the device. v cc vcc +7.0v input voltage at control pins ( re , de) -0.3v to (v cc + 0.3v) driver input voltage (di) -0.3v to (v cc + 0.3v) receiver output voltage (ro) -0.3v to (v cc + 0.3v) driver output voltage (a, b, y and z) -8v to +13v receiver input voltage (a, b) -8v to +13v storage temperature range -65c to + 150c lead temperature +300c power dissipation maximum junction temperature 150c 8-pin so ja = 128.4c/w 14-pin so ja = 86c/w xr5486e-5488e 4 ultra high speed rs-485/rs-422 profibus transceivers with 1/8th unit load and +/-15kv esd-protection rev. 1.0.0 caution: esd (electrostatic discharge) sensitive device. permanent dama ge may occur on unconnected devices subject to high energy elect rostatic fields. unused devices must be stored in conductive foam or shunts. personnel should be properly grounded prior to handling this device. the protective foam should be discharged to the destination so cket before devices are removed. electrical characteristics u nless otherwise noted : v cc = +5.0v +/-0.25v with t a from -40 o c to +85 o c. t ypical values are at v cc = +5.0v and 25 o c. s ymbol p arameters m in t yp m ax u nit s c onditions driver dc characteristics v od differential driver output vcc v no load 2.8 r l = 100 (rs-422), figure 3 2.4 r l = 54 (rs-485), figure 3 2.4 v cm = -7v, figure 4 2.4 v cm = +12v, figure 4 v od change in magnitude of differential output -0.20 0.20 v r l = 100 (rs-422), figure 3, see note 1 -0.20 0.20 r l = 54 (rs-485), figure 3, see note 1 -0.20 0.20 v cm = -7v, figure 4, see note 1 -0.20 0.20 v cm = +12v, figure 4, see note 1
xr5486e-5488e 5 rev. 1.0.0 ultra high speed rs-485/rs-422 profibus transceiv ers with 1/8th unit load and +/-15kv esd-protection v oc driver common mode output voltage steady state 3.0 v figure 3 ' v oc change in magnitude of common mode output voltage -0.2 0.2 v figure 3, see note 1 i osd driver short circuit current limit -250 250 ma -7v d v out d +12v, figure 5 i ol output leakage current (full- duplex versions, y and z pins) -75 125 p a de = 0v, re = 0v, vcc = 0v or 5v, -7v d v out d +12v v ih logic input thresholds (di, de, re ) 2.0 v logic input high v il 0.8 v logic input low v hys driver input hysteresis 100 mv t a = 25c i in logic input current (di, de and re ) -1 1 p a 0v d in d +vcc, after first transi - tion driver ac characteristics freq data signaling rate 52 mbp s 1/t ui , duty cycle 40 to 60%, fig - ure 4, c l = 50pf, r l = 54 : . t plh driver propagation delay (low to high) 4 25 ns c l = 50pf, r l = 54 : figures 6 and 7 t phl driver propagation delay (high to low) 4 25 ns c l = 50pf, r l = 54 : figures 6 and 7 t r driver rise time 2 8 ns c l = 50pf, r l = 54 : figures 6 and 7 t f driver fall time 2 8 ns c l = 50pf, r l = 54 : figures 6 and 7 _ t plh- t phl _ differential pulse skew +/-3 ns figures 6 and 7 t zh driver enable to output high 60 ns c l = 50pf, r l = 500 : figures 8 and 9 t zl driver enable to output low 60 ns c l = 50pf, r l = 500 : figures 10 and 11 t hz driver disable from output high 60 ns c l = 50pf, r l = 500 : figures 8 and 9 t lz driver disable from output low 60 ns c l = 50pf, r l = 500 : figures 10 and 11 t zv shutdown to driver output valid 1 p s c l = 50pf, r l = 500 : t shdn time to shutdown 50 200 600 ns notes 2, 3 and 4 receiver dc characteristics u nless otherwise noted : v cc = +5.0v +/-0.25v with t a from -40 o c to +85 o c. t ypical values are at v cc = +5.0v and 25 o c. s ymbol p arameters m in t yp m ax u nit s c onditions
xr5486e-5488e 6 ultra high speed rs-485/rs-422 profibus transceivers with 1/8th unit load and +/-15kv esd-protection rev. 1.0.0 i in input current (a, b pins) -75 125 p a de = 0, vcc = 0 or 3.3v v a or v b = 12v, other input 0v v a or v b = -7v, other input 0v v ih receiver differential thresholds (v a - v b ) -50 mv -7v d v cm d 12v, rising v il -200 mv -7v d v cm d 12v, falling receiver input hysteresis 25 mv v cm = 0v v oh receiver output voltage high vcc - 1.2 v i out = -8ma, v id = -50mv v ol receiver output voltage low 0.4 v i out = 8ma, v id = -200mv i oz high-z receiver output current +/-1 p a re = vcc, 0.40 d v out d 2.4v i oss receiver output short circuit current +/-125 ma 0 d v ro d vcc r in receiver input resistance 96 k : -7v d v cm d 12v receiver ac characteristics freq data signaling rate 52 mbp s 1/t ui , duty cycle 40 to 60%, c l = 15pf t plh receiver propagation delay (low to high) 20 30 ns v id = +/-2v, c l = 15pf, figures 12 and 13 t phl receiver propagation delay (high to low) 20 30 ns v id = +/-2v, c l = 15pf, figures 12 and 13 skew receiver propagation delay skew +/-3 ns v id = +/-2v, c l = 15pf, figures 12 and 13 skew = _ t plh- t phl _ t r receiver output rise time 2 4 ns c l = 15pf t f receiver output fall time 2 4 ns c l = 15pf t zh receiver enable to output high 40 ns c l = 15pf, r l = 1k : figures 14 and 15 t zl receiver enable to output low 40 ns c l = 15pf, r l = 1k : , figures 14 and 16 t hz receiver disable from output high 40 ns c l = 15pf, r l = 1k : figures 14 and 17 t lz receiver disable from output low 40 ns c l = 15pf, r l = 1k : figures 14 and 18 t zh(shdn) shutdown to receiver output valid high 1 p s c l = 15pf, r l = 1k : figures 14 and 15 u nless otherwise noted : v cc = +5.0v +/-0.25v with t a from -40 o c to +85 o c. t ypical values are at v cc = +5.0v and 25 o c. s ymbol p arameters m in t yp m ax u nit s c onditions
xr5486e-5488e 7 rev. 1.0.0 ultra high speed rs-485/rs-422 profibus transceiv ers with 1/8th unit load and +/-15kv esd-protection n ote : 1. change in magnitude of dif ferential output voltage and change in magnitude of common mode output voltage are the changes in output voltage when di input changes state. 2. the transceivers are put into shutdown by bringing re high and de low simultaneously for at least 600ns. if the control inputs are in this state for less than 50ns, the devi ce is guaranteed not enter shutdown. if the enable inputs are held in this state for at least 600ns the device is assur ed to be in shutdown. note that the receiver and driver enable times increase during shutdown. 3. guaranteed by design and bench characterization. 4. except devices which do not have de or re inputs. t zl(shdn) shutdown to receiver output valid low 1 p s c l = 15pf, r l = 1k : figures 14 and 16 t shdn time to shutdown 50 200 600 ns notes 2, 3 and 4 power requirements and reco mmended operating conditions vcc supply voltage 4.75 5.0 5.25 v i cc1 supply current - active mode 800 1500 p a no load, de = re = vcc or 0v, di = 0v or vcc i cc2 supply current - shutdown mode 1 p a de = 0v, re = vcc, di = vcc or 0v t sd thermal shutdown temperature 165 c thermal shutdown hysteresis 20 c esd protection at pins a, b, y and z pins +/-15 kv human body model +/-15 kv iec-61000-4-2 air discharge +/-8 kv iec-61000-4-2 contact discharge esd protection for ro, di, de and re pins +/-2 kv human body model +/-200 v machine model u nless otherwise noted : v cc = +5.0v +/-0.25v with t a from -40 o c to +85 o c. t ypical values are at v cc = +5.0v and 25 o c. s ymbol p arameters m in t yp m ax u nit s c onditions
f igure 3. d river dc t est c ircuit f igure 4. d river c ommon m ode l oad t est de out vcc/2 t zh , t zh(shdn) v om = (v ol + vcc)/2 t hz 0.2 5 v f igure 5. d river s hort c ircuit c urrent l imit t est xr5486e-5488e 8 ultra high speed rs-485/rs-422 profibus transceivers with 1/8th unit load and +/-15kv esd-protection rev. 1.0.0
f igure 6. d river p ropagation d elay t est c ircuit y z d di r l 54 c l 50pf 3.3v v od f igure 7. d river p ropagation d elay t iming d iagram vcc 0v di y z v o + v diff v y C v z 0v v o C vcc/2 vcc/2 t plh t f t r v o 1/2v o 1/2v o t phl t skew = |t dplh - t dphl | t dplh t dphl 10% 90% 10% 90% f igure 8. d river e nable and d isable t ime t est c ircuit 1 generator 50 s1 r l = 500 out c l = 50pf d 0 or vcc z y di xr5486e-5488e 9 rev. 1.0.0 ultra high speed rs-485/rs-422 profibus transceiv ers with 1/8th unit load and +/-15kv esd-protection
f igure 9. d river e nable d isable t iming d iagram 1 f igure 10. d river e nable and d isable t ime t est c ircuit 2 generator 50 s1 r l = 500 out c l = 50pf d 0 or vcc z y di vcc xr5486e-5488e 10 ultra high speed rs-485/rs-422 profibus transceivers with 1/8th unit load and +/-15kv esd-protection rev. 1.0.0
f igure 11. d river e nable and d isable t iming d iagram 2 f igure 12. r eceiver p ropagation d elay t est c ircuit f igure 13. r eceiver p ropagation d elay t iming d iagram b a out t phl t plh +1v -1v v oh v ol 1.5v xr5486e-5488e 11 rev. 1.0.0 ultra high speed rs-485/rs-422 profibus transceiv ers with 1/8th unit load and +/-15kv esd-protection
f igure 14. r eceiver e nable and d isable t imes t est c ircuit f igure 15. r eceiver e nable and d isable t iming d iagram 1 3v 1.5v 0v re out s1 is open, s2 is closed, s3 = 1.5v v oh t zh, t zh(shdn) v oh /2 f igure 16. r eceiver e nable and d isable t iming d iagram 2 3v 0v 1.5v v cc re out s1 is closed, s2 is open, s3 = -1.5v t zl, t zl(shdn) v ol = v cc /2 v ol xr5486e-5488e 12 ultra high speed rs-485/rs-422 profibus transceivers with 1/8th unit load and +/-15kv esd-protection rev. 1.0.0
f igure 17. r eceiver e nable and d isable t iming d iagram 3 3v 1.5v 0v re out s1 is open, s2 is closed, s3 = 1.5v v oh t hz 0.25v f igure 18. r eceiver e nable and d isable t iming d iagram 4 3v 0v 1.5v v cc re out s1 is closed, s2 is open, s3 = -1.5v t lz v ol 0.25v xr5486e-5488e 13 rev. 1.0.0 ultra high speed rs-485/rs-422 profibus transceiv ers with 1/8th unit load and +/-15kv esd-protection
xr5486e-5488e 14 ultra high speed rs-485/rs-422 profibus transceivers with 1/8th unit load and +/-15kv esd-protection rev. 1.0.0 1.0 product description xr5486e-xr5488e is a family of advanced rs-485/rs- 422 transceivers. each contain one driver and one receiver. the xr5488e is a half-duplex design while the xr5486e and XR5487E are full-duplex designs. all devices operate from a single 5.0v power supply. thes e devices feature failsafe ci rcuitry that guarantees a logic-high receiver output when the inputs are open or shorted, or when they are connected to a terminated transmission line with all drivers disabled. the control pins re and de feature a hotsw ap capability allowing live insertion without spurious data transfer. the drivers are not slew rate limited making transmit speeds up to 52mbps possible. drivers are output short-circuit curr ent limited. thermal-shutdown circuitry protects drivers against excessive power dissipation. when activited, the thermal-shutdown circuitry forces the driver outptus into a high-impedance state. advanced failsafe ordinary rs-485 differential receiver s will be in an indetermin ate state whenever the data bus is not being actively driven. the advanced failsafe feature of the xr5486e-xr5488e family guarantees a logic-high receiver output when the receiver inputs are open or shorted, or when they are connected to a terminated transmission line with all drivers disabled. in a termin ated bus with all transmitters disabled, the receivers? differential input voltage is pulled to 0v by the te rmination. the xr5486e-xr5488e family interprets 0v differential as a logic high with a minimum 50mv noise margin while maintaining compliance with the eia/tia- 485 standard of +/-200mv. hot-swap capability when a micro-processor or other logic device undergoes its power-up sequence, its logic-outputs are typically at high impedance. in this state they are unable to drive the de and re signals to a defined logic level. during this period, noise, parasitic coupling or leakage from other devices could cause standard cmos enable inputs to drift to an in correct logic level. if circuit boards are inserted into an energized backpl ane (commonly called "live insertion" or "hot-swap") power may suddenly be applied to all circuits. without the hot-swap capability, this situat ion could improperly enable the transceiver?s driver or rece iver, driving invalid data onto shared busses and possibly causing driver contention or device damage. the xr5486e-xr5488e family contains a special power- on-reset circuit that holds the driver enable and receiver enable inactive for approximately 10 microsec onds. after this initial power-up sequence the hot-swap circuit becomes transparent and driver enable and rece iver enable resume their normal un-skewed functions and timings. +/-15kv esd protection esd protection structures are incorporated on all pins to protect against electros tatic discharges encountered during handling and assembly. the driver outputs and re ceiver inputs of the xr5486e-xr5488e family have extra protection against static electricity. exar uses stat e of the art structures to pr otect these pins against esd of +/-15kv without damage. the esd structures withstand high esd in all states: normal operation, shutdown and powered down. after an esd event, the xr5486e-xr5488e family keep operating without latch-up or damage. esd protection can be tested in various ways. the tran smitter outputs and receiver inputs of the xr5486e- xr5488e family are characterized for protection to the following limits: +/-15kv using the human body model +/-8kv using the contact discharge model +/-15kv using the airgap discharge model esd test conditions esd performance depends on a variety of conditions. contact exar for a re liability report that documents test setup, methodology and results.
xr5486e-5488e 15 rev. 1.0.0 ultra high speed rs-485/rs-422 profibus transceiv ers with 1/8th unit load and +/-15kv esd-protection iec 61000-4-2 the iec 61000-4-2 standard covers esd testing and perform ance of finished equipment. however, it does not specifically refer to integrated circuits. the xr5486e- xr5488e family helps you design equipment to meet iec 61000-4-2, without sacrificing board-space and cost for external esd-protection components. the major differences between tests done using the hu man body model and iec 61000-4-2 is a higher peak current in iec 61000-4-2. series resi stance is lower in the iec 61000-4-2 model. hence, the esd withstand voltage measured to iec 61000-4-2 is genera lly lower than that of human body model. the air-gap test involves approaching the device with a charged probe. the contact discharge method connects the probe to the device before the probe is energized. machine model the machine model for esd tests all pins using a 200pf storage capacitor and zero discharge resistance. the objective is to emulate the stress caused when i/o pins are contacted by handling equipment during test and assembly. 256 transceivers on the bus the standard rs-485 receiver input impedance is 12k ohms (1 unit load). a standard driver can drive up to 32 unit loads. the xr5486e-xr5488e family of transceivers have only a 1/8 th unit load receiv er input impedance of 96k ohms, thereby allowing eight times as many, up to 256, transceivers to be connected in parallel on a communication line. any combination of these devices an d other rs-485 transceivers up to a total of 32 unit loads may be connected to the line. low power shutdown mode low-power shutdown mode is initiated by bringing both re high and de low simultaneously. while in shutdown devices draw only 50na of supply current. de and re may be tied together and driven by a single control signal. devices are guaranteed not to enter shutdown if re is high and de is low for less than 50ns. if the inputs are in this state for at least 600ns, the parts are shutdown. enable times t zh and t zl apply when the part is not in low-power shutdown state. enable times t zh(shdn) and t zl(shdn) apply when the parts are shutdown. the drivers and receivers take longer to become enabled from low-power shutdown t zh(shdn) and t zl(shdn) than from driver / receiver disable mode ( t zh and t zl ). driver output protection two mechanisms prevent excessive output current and power dissipation caused by faults or by bus contention. first, a driver current limit on the output stage provides immediate protection against short circuits over the whole common-mode voltage range. second, a the rmal-shutdown circuit forces the driver outputs into a high-impedance state if junction temperature becomes excessive. line length the rs-485/rs-422 standard covers line lengths up to 40 00ft. maximum achievable line length is a function of signal attenuation and noise. termination prevents sign al reflections by eliminating the impedance mismatches on a transmission line. line termination is generaly used if rise and fall times are shorter than the round-trip signal propagation time.
xr5486e-5488e 16 ultra high speed rs-485/rs-422 profibus transceivers with 1/8th unit load and +/-15kv esd-protection rev. 1.0.0 2.0 function tables t able 1: full duplex 14 pin xr5486e inputs outputs re de di y z x 1 1 1 0 x 1 0 0 1 0 0 x high-z 1 0 x shutdown t able 2: full duplex 8 pin XR5487E input outputs di y z 1 1 0 0 0 1 t able 3: half duplex xr5488e inputs outputs re de di a b x 1 1 1 0 x 1 0 0 1 0 0 x high-z 1 0 x shutdown transmitting transmitting transmitting
t able 4: full duplex 14 pin xr5486e inputs ouptut re de v - v ro 0 x -50mv 1 0 x -200mv 0 0 x open/shorted 1 1 1 x high-z 1 0 x shutdown t able 5: full duplex 8 pin XR5487E inputs output v - v ro -50mv 1 -200mv 0 open/shorted 1 t able 6: half duplex xr5488e inputs output re de v - v ro 0 x -50mv 1 0 x -200mv 0 0 x open/shorted 1 1 1 x high-z 1 0 x shutdown xr5486e-5488e 17 rev. 1.0.0 ultra high speed rs-485/rs-422 profibus transceiv ers with 1/8th unit load and +/-15kv esd-protection note: receiver inputs -200mv < v a - v b < -50mv should be considered indeterminate. receiving a b receiving a b receiving a b
xr5486e-5488e 18 ultra high speed rs-485/rs-422 profibus transceivers with 1/8th unit load and +/-15kv esd-protection rev. 1.0.0 3.0 product selector guide t able 7: selection guide m bps xr5486e full 52 yes yes 256 sn75180 XR5487E full 52 no no 256 sn75179 xr5488e half 52 yes yes 256 sn75176 4.0 typical applications: r t r t stub half-duplex network bi-directional full-duplex network part number duplex data rate shutdown receiver and driver enable trans on bus foot-print
repeater (optional) repeater (optional) point to multi-point with repeater xr5486e-5488e 19 rev. 1.0.0 ultra high speed rs-485/rs-422 profibus transceiv ers with 1/8th unit load and +/-15kv esd-protection
package dimensions (14 pin nsoic) xr5486e-5488e 20 ultra high speed rs-485/rs-422 profibus transceivers with 1/8th unit load and +/-15kv esd-protection rev. 1.0.0
package dimensions (8 pin nsoic) xr5486e-5488e 21 rev. 1.0.0 ultra high speed rs-485/rs-422 profibus transceiv ers with 1/8th unit load and +/-15kv esd-protection
xr5486e-5488e 22 ultra high speed rs-485/rs-422 profibus transceivers with 1/8th unit load and +/-15kv esd-protection rev. 1.0.0
revision history d ate r evision d escription november 2009 rev 1.0.0 released datasheet. october 2010 1.0.1 add profibus logo to front page 23 notice exar corporation reserves the right to make changes to the products contained in this publicat ion in order to improve design, performanc e or reliability. exar corp oration assumes no responsibility for the use of any circuits described herein, conveys no license under any patent or other right, and makes no representation that the circuits are free of patent infr ingement. charts and schedules contai ned here in are only for illustration purposes and may vary depending upon a user?s specific application. while the information in this publication has been carefully ch ecked; no responsibility, however , is assumed for inaccuracies. exar corporation does not re commend the use of any of its products in life suppo rt applications where the failure or malfunction of the product can reasonably be ex pected to cause failure of the life support system or to significantly affect its safety or effectiveness. products ar e not authorized for use in such applications unless exar corporation receives , in writing, assuranc es to its satisfaction that: (a) th e risk of injury or damage has been minimized; (b) th e user assumes all such ris ks; (c) potential liability of exar corporation is adequately protected under the circumstances. copyright 2010 exar corporation datasheet october 2010. send your technical inquiries wit h details to our e-mail hotline: uarttechsupport@exar.com . reproduction, in part or whole, without the prior written consent of exar co rporation is prohibited. xr5486e-5488e ultra high speed rs-485/rs-422 profibus transceivers with 1/8th unit load and +/-15kv esd-protection rev. 1.0.0

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