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union semiconductor, inc. http://www.union-ic. com UM3483E , um3486e 3.3v-powered, 15kv esd-protected, and slew-rate-limited true rs-485 transceivers general description the UM3483E, um3486e are +15 kv esd protected, slew-rate limited, ultra lower differential line transceivers which provide full rs485 compatibility while operating from single 3.3v supply. each part contains one driver and one receiver, which is designed for data transmission with extended common mode range (-7v to 12v). the UM3483E features slew-rate limited driver that minimizes emi and reduces reflections caused by improperly terminated cables, allowing error-free data transmission at data rate up to 50 0kbps, while partially slew-rate limited um3486e transmits up to 2.5mbps. all devices feature enhanced electrostatic discharge (esd) protection. all transmitter outputs and receiver inputs are protecte d to 15kv using iec 1000-4-2 air-gap discharge and 15kv using the human body model. drivers are short-circuit current limited and are protected against excessive power dissipation by thermal shutdown circuitry t hat places the driver outputs into a high-impedance state. the receiver input has a fail-safe feature that guarantees a logic-high output if both inputs are open, shorted or idle. both parts have power up/down glitch free driver outputs permit live insertion or removal of transceiver from/to data bus. the cmos design offers significant power savings without sacrificing ruggedness against overload or esd damage. typical quiescent current is only 500 a while operating and 1 a in shutdown. the UM3483E, um3486e are fully specified over the commercial an extended industrial temperature range and are available in 8-pi n and dip packages. applications telecommunications low-power rs-485 transceivers integrated services digital networks transceivers for emi-sensitive applications packet switching features esd protection for rs-485 i/o pins 15kvhuman body model 15kviec 1000-4-2, air-gap discharge operate from a single 3.3v supply interoperable with +5v logic slew-rate limited for errorless data transmission 1 a low-current shutdown mode C7v to +12v common-mode input voltage range allows up to 256 transceivers on the bus thermal shutdown current-limiting for driver overload protection ordering information UM3483E,um3486e datasheet rev.0.1, dec.2005 page 1 of 12 part temp. range pin-package UM3483Eesa -40c to +85c 8 so UM3483Eepa -40c to +85c 8 plastic dip um3486eesa -40c to +85c 8 so um3486eepa -40c to +85c 8 plastic dip
union semiconductor, inc. http://www.union-ic. com selector guide absolute maximum ratings stresses beyond those listed under ?absolute maximum ratings? may cause permanent damage to the device. these are stress rating s only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the s pecifications is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. dc electrical characteristics (v cc = 3.3v 0.3v, t a = t min to t max , unless otherwise noted. typical values are at t a = +25c) UM3483E,um3486e datasheet rev.0.1, dec.2005 page 2 of 12 part number guaran teed data rate (mbps) supply voltage (v) slew-rate limited driver/ receiver enable shutdown current (a) 15kv esd protection pin count UM3483E 0.5 yes yes 1 yes 8 um3486e 2.5 3.0 to 3.6 yes yes 1 yes 8 supply voltage (vcc) .............................. ..................5v control input voltage (/re, de) . ............ .....-0.3v to 5v driver input voltage (di) ........ .............. .......-0.3v to 5v driver output voltage (a, b)............. -7v to 12v receiver input voltage (a, b) ............. ......-7v to 12v receiver output voltage (ro). ...-0.3v to (vcc + 0.3v) continuous power dissipation (ta = +70c) 8-pin plastic dip (derate 9.09mw/c above +70c)..727mw 8-pin so (derate 5.88mw/c above +70).471mw operating temperature ranges um348 _ee_ _.............................. ......-40c to +85c storage temperature range ........ .. ....-65c to +160c lead temperature (soldering, 10sec) ... ...............+300c parameter symbol conditions min typ max units r l = 54 ? (rs-485), figure 2 1.2 differential driver output v od r l = 60 ? (rs-485), v cc = 3.3v, figure3 1.2 v change in magnitude of driver differential output voltage for complementary outpu t states (note 1) v od r l = 54 ? or 100 , figure 2 0.2 v driver common-mode output voltage v oc r l = 54 ? or 100 , figure 2 2 v change in magnitude of common-mode output voltage (note 1) v oc r l = 54 or 100 , figure 2 0.2 v input high voltage v ih de, di, /re 2.0 v input low voltage v il de, di, /re 0.8 v logic input current i in1 de, di, /re f 2 a v in = 12v 1.0 input current (a, b) i in2 de = 0v, v cc = 0v or 3.6v v in = -7v -0.8 ma receiver differential threshold voltage v th -7v 0 v cm 0 12v -0.2 -0.05 v receiver input hysteresis v th v cm = 0v 20 mv receiver output high voltage v oh i out = -1.5ma, v id = 200mv, figure 4 v cc - 0.4 v receiver output low voltage v ol i out = 2.5ma, v id = 200mv, figure 4 0.4 v three-state (high impedance) output current at receiver i ozr v cc = 3.6v, 0v 0 v out 0 v cc f 1 a receiver input resistance r in -7v 0 v cm 0 12v 96 k supply voltage range v cc 3.0 3.6 v de = v cc , /re = 0v or v cc 0.6 1.2 supply current i cc no load, di = 0v or v cc de = 0v, /re = 0v 0.5 1.0 ma supply current in shutdown mode i shdn de = 0v, /re = v cc , di = v cc or 0v 1.0 a v out = -7v -250 driver short-circuit output current i osd v out = 12v 250 ma receiver short-circuit output current i osr 0v 0 v ro 0 v cc f 8 f 60 ma human body model 15 esd protection for a, b iec 1000-4-2 air discharge 15 kv
union semiconductor, inc. http://www.union-ic. com receiver switching characteristics?UM3483E (v cc = 3.3v, t a = +25c) receiver switching characteristics?um3486e (v cc = 3.3v, t a = +25c) UM3483E,um3486e datasheet rev.0.1, dec.2005 page 3 of 12 parameter symbol conditions min typ max units maximum data rate 2.5 mbps driver differential output delay t dd r l = 60 , figure 5 20 42 70 ns driver differential output transition time t td r l = 60 , figure 5 15 28 60 ns driver propagation delay, low-to-high level t plh r l = 27 , figure 6 20 42 75 ns driver propagation delay, high-to-low level t phl r l = 27 , figure 6 20 42 75 ns |t plh - t phl | driver propagation delay skew (note 2) t pds r l = 27 , figure 6 -6 f 12 ns driver-output enable/disable times driver output enable time to low level t pzl r l = 110 , figure 18 52 100 ns driver output enable time to high level t pzh r l = 110 , figure 7 52 100 ns driver output disable time from high level t phz r l = 110 , figure 7 40 80 ns driver output disable time from low level t plz r l = 110 , figure 8 40 80 ns driver output enable time from shutdown to low level t psl r l = 110 , figure 8 700 1000 ns driver output enable time from shutdown to high level t psh r l = 110 , figure 7 700 1000 ns parameter symbol conditions min typ max units maximum data rate 0.5 mbps driver differential output delay t dd r l = 60 , figure 5 600 900 1400 ns driver differential output transition time t td r l = 60 , figure 5 400 740 1200 ns driver propagation delay, low-to-high level t plh r l = 27 , figure 6 700 930 1500 ns driver propagation delay, high-to-low level t phl r l = 27 , figure 6 700 930 1500 ns |t plh - t phl | driver propagation delay skew (note 2) t pds r l = 27 , figure 6 f 50 ns driver-output enable/disable times driver output enable time to low level t pzl r l = 110 , figure 8 900 1300 ns driver output enable time to high level t pzh r l = 110 , figure 7 600 800 ns driver output disable time from high level t phz r l = 110 , figure 7 50 80 ns driver output disable time from low level t plz r l = 110 , figure 8 50 80 ns driver output enable time from shutdown to low level t psl r l = 110 , figure 8 1.9 2.7 s driver output enable time from shutdown to high level t psh r l = 110 , figure 7 2.2 3.0 s
union semiconductor, inc. http://www.union-ic. com receiver switching characteristics (v cc = +3.3v, t a = +25c.) typical operating characteristics (v cc = 3.3v, t a = +25c, unless otherwise noted.) UM3483E,um3486e datasheet rev.0.1, dec.2005 page 4 of 12 parameter symbol conditions min typ max units time to shutdown t shdn UM3483E /um3486e (note 3) 80 190 300 ns v id = 0 to 3.0v, c l = 15pf, figure 9 25 62 90 receiver propagation delay, low-to-high level t rplh UM3483E 25 75 120 ns v id = 0 to 3.0v, c l = 15pf, figure 9 25 62 90 receiver propagation delay, high-to-low level t rphl UM3483E 25 75 120 ns v id = 0 to 3.0v, c l = 15pf, figure 9 6 10 | t plh - t phl | receiver propagation-delay skew t rpds UM3483E 12 20 ns receiver-output enable time to low level t przl c l = 15pf, figure 10, UM3483E /um3486e 25 50 ns receiver-output enable time to high level t przh c l = 15pf, figure 10, UM3483E /um3486e 25 50 ns receiver-output disable time from high level t prhz c l = 15pf, figure 10, UM3483E /um3486e 25 45 ns receiver-output disable time from low level t prlz c l = 15pf, figure 10, UM3483E /um3486e 25 45 ns receiver-output enable time from shutdown to low level t prsl c l = 15pf, figure 12, UM3483E /um3486e 720 1400 ns receiver-output enable time from shutdown to high level t prsh c l = 15pf, figure 10, UM3483E /um3486e 720 1400 ns note 1: v od and v oc are the changes in v od and v oc , respectively, when the di input changes state. note 2: measured on |tplh (y) - tphl (y)| and |tplh (z) - tphl (z)|. note 3: the transceivers are put into shutdown by bringing /re high and de low. if the inputs are in this state for less than 80ns, the parts are guaranteed not to enter shutdown. if the inputs are in this state for at least 300ns, the parts are guaranteed to hav e entered shutdown. see low-power shutdown mode section.
union semiconductor, inc. http://www.union-ic. com typical operating characteristics (continued) (v cc = 3.3v, t a = +25c, unless otherwise noted.) UM3483E,um3486e datasheet rev.0.1, dec.2005 page 5 of 12
union semiconductor, inc. http://www.union-ic. com pin description figure 1. UM3483E /um3486e pin configuration and typical operating circuit figure 2. driver v od and v oc figure 3. driver v od with varying common-mode voltage figure 4. receiver v oh and v ol UM3483E,um3486e datasheet rev.0.1, dec.2005 page 6 of 12 pin name function 1 ro receiver output. if a > b by -50mv, ro will be high; if a < b by 200mv, ro will be low. 2 /re receiver output enable. ro is enabled when re is low; ro is high impedance when re is high. if re is high and de is low, the device will enter a low-power shutdown mode. 3 de driver output enable. the driver outputs are enabled by bringing de high. they are high impedance when de is low. if /re is high and de is low, the device will enter a low-power shutdown mode. if the driver outputs are enabled, the parts function as line drivers. while they are high impedance, they function as line receivers if /re is low. 4 di driver input. a low on di forces output b high and output a low. similarly, a high on di forces output b low and output a high. 5 gnd ground 6 a noninverting receiver input and noninverting driver output 7 b inverting receiver input and inverting driver output 8 v cc positive supply: 3.0v 0 v cc 0 3.6v
union semiconductor, inc. http://www.union-ic. com figure 5. driver differential output delay and transition times figure 6. driver propagation times figure 7. driver enable and disable times (t pzh , t psh , t phz ) figure 8. driver enable and disable times (t pzl , t psl , t plz ) UM3483E,um3486e datasheet rev.0.1, dec.2005 page 7 of 12
union semiconductor, inc. http://www.union-ic. com figure 9. receiver propagation delay figure 10. receiver enable and disable times note 4: the input pulse is supplied by a generator with the following characteristics: prr = 250khz, 50% duty cycle, t r =6.0ns, z o = 50 . note 5: c l includes probe and stray capacitance. function tables devices with receiver/driver enable table 1. transmitting table 2. receiving UM3483E,um3486e datasheet rev.0.1, dec.2005 page 8 of 12 inputs outputs /re de di b a mode x 1 1 0 1 normal x 1 0 1 0 normal 0 0 x high-z high-z normal 1 0 x high-z high-z shutdown inputs outputs /re de a, b ro mode 0x 1 ? -0.05v 1 normal 0x 0 ? -0.2v 0 normal 0 x inputs open 1 normal 1 0 x high-z shutdown
union semiconductor, inc. http://www.union-ic. com applications information the UM3483E /um3486e are low-power transceivers for rs-485 communications. the UM3483E can transmit and receive at data rates up to 500kbps, and the um3486e at up to 2.5mbps. the UM3483E /um3486e are half-duplex. driver enable (de) and receiver enable (/re) pins are included on the UM3483E/ um3486e. when disabled, the driver and receiver outputs are high impedance. reduced emi and reflections the UM3483E is slew-rate limited, minimizing emi and reducing reflections caused by improperly terminated cables. figure 11 shows the output waveform of the slew-rate-limited UM3483E transmitting a 125khz signal, as well as the fourier analysis of tha t waveform. the high-frequency harmonics have much lower amplitudes, and the potential for emi is significantly reduced. low-power shutdown mode a low-power shutdown mode is initiated by bringing both /re high and de low. the devices will not shut down unless both the driver and receiver are disabled (high impedance). in shutdown, the devices typically draw only 1a of supply current. for these devices, the tpsh and tpsl enable times assume the part was in the low-power shutdown mode; the tpzh and tpzl enable times assume the receiver or driver was disabled, but the part was not shut down. figure 11. driver output waveform and fft plot of figure 12. UM3483E driver propagation delay UM3483E transmitting a 125khz signal figure 13. UM3483E receiver propagation delay figure 14. UM3483E system differential voltage at 125khz dri ving 4000 ft of cable UM3483E,um3486e datasheet rev.0.1, dec.2005 page 9 of 12
union semiconductor, inc. http://www.union-ic. com driver output protection excessive output current and power dissipation caused by faults or by bus contention are prevented by two mechanisms. a foldbac k current limit on the output stage provides immediate protection against short circuits over the whole common-mode voltage range (see typical operating characteristics). in addition, a thermal shutdown circuit forces the driver outputs into a high-impedanc e state if the die temperature rises excessively. propagation delay figures 12 and 13 show the typical propagation delays. skew time is simply the difference between the low-to-high and high-to-l ow propagation delay. small driver/receiver skew times help maintain a symmetrical mark-space ratio (50% duty cycle). the receiver skew time, |tprlh - tprhl|, is under 10ns (20ns for the UM3483E). the driver skew times 12ns for the um3486e, and typically under 50ns for the UM3483E. line length vs. data rate 15kv esd protection as with all union devices, esd-protection structures are incorporated on all pins to protect against electrostatic discharges e ncoun- tered during handling and assembly. the driver outputs and receiver inputs of the UM3483E family of devices have extra protecti on against static electricity. unions engineers have developed state-of-the-art structures to protect 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, unions e versions keep working without latchup or damage. esd protection can be tested in various ways; the transmitter outputs and receiver inputs of this product fa mily are characterized for protection to the following limits: 1) 15kv using the human body model 2) 15kv using iec 1000-4-2s air-gap method. human body model iec 1000-4-2 the iec 1000-4-2 standard covers esd testing and performance of finished equipment; it does not specifically refer to integrate d circuits. the UM3483E family devices help you design equipment that meets level 4 (the highest level) of iec 1000-4-2, without the need for additional esd-protection components. the major difference between tests done using the human body model and iec 1000-4-2 is higher peak current in iec 1000-4-2, because series resistance is lower in the iec 1000-4-2 model. hence, the esd withstand voltage measured to iec 1000-4-2 is generally lower than that measured using the human body model. figure 16a shows the iec 1000-4-2 model, and figure 16b shows the current waveform for the 8kv iec 1000-4-2, level 4 esd contact-discharge test. the air-gap test involves approaching the device with a charged probe. UM3483E,um3486e datasheet rev.0.1, dec.2005 page 10 of 12 the rs-485 standard covers line lengths up to 4000 feet. figure 13 shows the system differential voltage for parts driving 4000 feet of 26awg twisted-pair wire at 125khz into 120 loads. figure 15a shows the human body model and figure 15b shows the current waveform it generates when discharged into a low impedance. this model consists of 100pf capacitor charged to the esd voltage of interest, which is then discharged into the test device through a 1.5k ? resistor.
union semiconductor, inc. http://www.union-ic. com machine model the machine model for esd tests all pins using a 200pf storage capacitor and zero discharge resistance. its objective is to emu late the stress caused when i/o pins are contacted by handling equipment during test and assembly. of course, all pins require this protection, not just rs-485 inputs and outputs. typical applications the UM3483E, um3486e transceivers are designed for bidirectional data communications on multipoint bus transmission lines. figures 1 shows typical network applications circuits. to minimize reflections, the line should be terminated at both ends in its characteristic impedance, and stub lengths off the m ain line should be kept as short as possible. the slew-rate-limited UM3483E and the partially slew-rate-limited um3486e are more toleran t of imperfect termination. figure 15a. human body esd test model figure 15b. human body current waveform figure 16a. iec 1000-4-2 esd test model figure 16b. iec 1000-4-2 esd generator current w aveform UM3483E,um3486e datasheet rev.0.1, dec.2005 page 11 of 12
union semiconductor, inc. http://www.union-ic. com package information UM3483E,um3486e datasheet rev.0.1, dec.2005 page 12 of 12

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