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preliminary technical data a high-speed (10mbps), fail-safe, rs-485/rs-422 transceivers with slew-rate-limiting and 15kv esd protection ADM3082/adm3085/adm3088 information furnished by analog devices is believed to be accurate and reliable. however, no responsibility is assumed by analog devices for its use, nor for any infringements 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 analog devices. one technology way, p.o. box 9106, norwood, ma 02062-9106, u.s.a. tel: 617/329-4700world wide web site: http://www.analog.com fax: 617/326-8703 ? analog devices, inc., 2002 general description the ADM3082/adm3085/adm3088 are high-speed rs-485/rs-422 transceivers consisting of one driver and one receiver per package. the devices feature fail-safe operation, ensuring a logic-high receiver output when the receiver in- puts are open-circuit or short-circuit. this guarantees that the receiver output will be high if all the transmitters on a terminated bus are disabled (high-impedance). the ADM3082 has a slew-rate limited driver to minimize electromagnetic interference (emi) and reduce reflections caused by incorrectly terminated cables. this allows error- free transmission at data rates up to 115kbps. the adm3085 offers a higher slew rate allowing data rates up to 500kbps, while the adm3088 has a driver whose slew rate is not limited, allowing data rates up to 10mbps. all devices in the family feature 15kv electrostatic dis- charge (esd) protection and high receiver input imped- ance (1/8 unit load), allowing up to 256 transceivers on the bus. the devices have low current drain of 375a un- loaded, or fully loaded with the drivers disabled, and fea- ture an ultra-low power (1na) shutdown mode. features enhanced slew rate limiting for error-free data transmission fail-safe receiver operation while maintaining eia/tia-485 compatibility low-current (1na) shutdown mode high input impedance up to 256 transceivers on bus 15kv esd protection (human body model) on rs-485 i/o pins pin-compatible with industry standard 75176 applications enhanced replacement for industry-standard parts emi-sensitive systems level translation lans for industrial control applications functional block diagram 1 2 3 4 8 7 6 5 d r ro re de di v cc b a gnd ADM3082/adm3085/adm3088
ADM3082/adm3085/adm3088 ?2? preliminary technical data ADM3082/adm3085/adm3088 specifications dc electrical characteristics (v cc = +5v 5%, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v and t a = +25c.) (note 1) driver parameter min typ max units test conditions/comments differential driver output, v od1 5 v figure 1 (no load) differential driver output,v od2 2.0 v figure 1, r = 50 v (rs-422) 1.5 v figure 1, r = 27 v (rs-485) change-in-magnitude of differential 0.2 v figure 1, r = 50 v or r = 27 v common-mode output voltage, d v od (note 2) driver common-mode 3 v figure 1, r = 50 v or r = 27 v output voltage, v oc change-in-magnitude of 0.2 v figure 1, r = 50 v or r = 27 v common-mode voltage, d v oc (note 2) input high voltage,v ih1 2.0 v (de, di, re ) input low voltage, v ll1 0.8 v (de, di, re ) di input hysteresis, v hys 100 mv input current, i in1 (de, di, re )2a input current (a and b), i in4 125 a de = gnd, v cc = gnd or 5.25v, v in = 12v ?75 a de = gnd, v cc = gnd or 5.25v, v in = ?7v output leakage (y and z), 125 a de = gnd, v cc = gnd or 5.25v, full duplex, i o v in = 12v ?100 a de = gnd, v cc = gnd or 5.25v, v in = ?7v driver short-circuit,v od1 ?250 ma ?7v # v out # v cc (note 3) output current 250 ma 0v # v out # 12v (note 3) 25 ma 0v # v out # v cc (note 3)
ADM3082/adm3085/adm3088 ?3? preliminary technical data ADM3082/adm3085/adm3088 specifications (continued) dc electrical characteristics (v cc = +5v 5%, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v and t a = +25c.) (note 1) receiver parameter min typ max units test conditions/comments receiver differential threshold ?200 ?125 ?50 mv ?7v # v cm # 12v voltage, v th receiver input hysteresis, d v th 25 mv receiver output high voltage, v oh v cc ?1 .5 v i o = -4ma, v id = -50mv receiver output low voltage, v ol 0.4 v i o = 4ma, v id = -200mv three-state output current at 1 a 0.4v # v o # 2.4v receiver, i ozr receiver input resistance, r in 96 k v ?7v # v cm # 12v receiver output short-circuit 7 95 ma 0v # v ro # v cc current, i osr supply current parameter min typ max units test conditions/comments supply current, i cc 430 900 a no load, re = di = gnd or v cc , de = v cc 375 600 a no load, re = di = gnd or v cc , de = gnd supply current in 0.001 10 a de = gnd, v re = v cc shutdown mode, i shdn esd protection for y, z, a, b 15 k v human body model notes 1 all currents into the device are positive; all currents out of the device are negative. all voltages are referred to device gro und unless otherwise noted. 2 d do and d v cc are the changes in v od and v oc , respectively, when the di input changes state. 3 maximum current level applies to peak current just prior to foldback-current limiting; minimum current level applies during cur rent limiting.
ADM3082/adm3085/adm3088 ?4? preliminary technical data ADM3082/adm3085/adm3088 specifications (continued) switching characteristics?ADM3082 (v cc = +5v 5%, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v and t a = +25c.) (note 1) parameter min typ max units test conditions/comments driver input-to-output, t dplh 500 2030 2600 ns fi gures 2 and 3, r diff = 54 v , driver input-to-output, t dphl 500 2030 2600 ns c l1 = c l2 = 100pf driver output skew,|t dplh -t dphl |, t dskew ?3 200 ns fi gures 2 and 3, r diff = 54 v , c l1 = c l2 = 100pf driver rise or fall time, t dr , t df 667 1320 2500 ns fi gures 2 and 3, r diff = 54 v , c l1 = c l2 = 100pf maximum data rate, f max 115 kbps driver enable to output high, t dzh 3500 ns figures 5 and 6, c l = 100pf, s2 closed driver enable to output low, t dzl 3500 ns figures 5 and 6, c l = 100pf, s1 closed driver disable time from low, t dlz 100 ns figures 5 and 6, c l = l5pf, s1 closed driver disable time from high, t dhz 100 ns figures 4 and 5, c l = l5pf, s2 closed receiver input to output, t rplh , t rphl 127 200 ns figure 7; |v id | $ 2.0v; rise and fall time of v id # l5ns differential receiver skew, t rskd 3 30 ns figure 7; |v id | $ 2.0v; |t rplh - t rphl | rise and fall time of v id # l5ns receiver enable to output low, t rzl 20 50 ns figures 7 and 8; c l = 100pf, s1 closed receiver enable to output high, t rzh 20 50 ns figures 7 and 8, c l = 100pf, s2 closed receiver disable time from low, t rlz 20 50 ns figures 7 and 8, c l = 100pf, s1 closed receiver disable time from high, t rhz 20 50 ns figures 7 and 8 c l = 100pf, s2 closed time to shutdown, t shdn 50 200 600 ns (note 5) driver enable from shutdown to 6000 ns figures 5 and 6, c l = l5pf, output high, t dzh(shdn) s2 closed driver enable from shutdown to 6000 ns figures 5 and 6, c l = l5pf, output low, t dzl(shdn) s1 closed receiver enable from shutdown 3500 ns figures 7 and 8, c l = 100pf, to output high, t rzh(shdn) s2 closed receiver enable from shutdown 3500 ns figures 7 and 8, c l = 100pf, to output low, t rzl(shdn) s1 closed
ADM3082/adm3085/adm3088 ?5? preliminary technical data ADM3082/adm3085/adm3088 specifications (continued) switching characteristics?adm3085 (v cc = +5v 5%, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v and t a = +25c.) (note 1) parameter min typ max units test conditions/comments driver input-to-output, t dplh 250 720 1000 ns figures 2 and 3 r diff = 54 v , driver input-to-output, t dphl 250 720 1000 ns c l1 = c l2 = 100pf driver output skew,|t dplh - t dphl |, t dskew ?3 100 ns fi gures 2 and 3, r diff = 54 v , c l1 = c l2 = 100pf driver rise or fall time, t dr , t df 200 530 750 ns figures 2 and 3, r diff = 54 v , c l1 = c l2 = 100pf maximum data rate, f max 500 kbps driver enable to output high, t dzh 2500 ns figures 5 and 6, c l = 100pf, s2 closed driver enable to output low, t dzl 2500 ns figures 5 and 6, c l = 100pf, s1 closed driver disable time from low, t dlz 100 ns figures 5 and 6, c l = l5pf, s1 closed driver disable time from high, t dhz 100 ns figures 5 and 6, c l = l5pf, s2 closed receiver input to output, t rplh , t rphl 127 200 ns figure 7; |v id | $ 2.0v; rise and fall time of v id # l5ns differential receiver skew, t rskd 3 30 ns figure 7; |v id | $ 2.0v; |t rplh - t rphl | rise and fall time of v id # l5ns receiver enable to output low, t rzl 20 50 ns figures 7 and 8 c l = 100pf, s1 closed receiver enable to output high, t rzh 20 50 ns figures 7 and 8, c l = 100pf, s2 closed receiver disable time from low, t rlz 20 50 ns figures 7 and 8, c l = 100pf, s1 closed receiver disable time from high, t rhz 20 50 ns figures 7 and 8, c l = 100pf, s2 closed time to shutdown, t shdn 50 200 600 ns (note 5) driver enable from shutdown 4500 ns figures 5 and 6, c l = l5pf, to output high, t dzh(shdn) s2 closed driver enable from shutdown 4500 ns figures 5 and 6, c l = l5pf, to output low, t ozl(shdn) s1 closed receiver enable from shutdown 3500 ns figures 7 and 8, c l = 100pf, to output high, t rzh(shdn) s2 closed receiver enable from shutdown 3500 ns figures 7 and 8, c l = 100pf, to output low, t rzl(shdn) s1 closed
ADM3082/adm3085/adm3088 ?6? preliminary technical data ADM3082/adm3085/adm3088 specifications (continued) switching characteristics?adm3088 (v cc = +5v 5%, t a = t min to t max , unless otherwise noted. typical values are at v cc = +5v and t a = +25c.) (note 1) parameter min typ max units test conditions/comments driver input-to-output, t dplh 34 60 ns figures 2 and 5, r diff = 54 v , driver input-to-output, t dphl 34 60 ns c l1 = c l2 = 100pf driver output skew,|t dplh -t dphl |, t dskew ?2.5 10 ns fi gures 2 and 5, r diff = 54 v , c l1 = c l2 = 100pf driver rise or fall time, tdr, tdf 14 25 ns fi gures 7 and 9, r diff = 54 v , c l1 = c l2 = 100pf maximum data rate, f max 10 mbps driver enable to output high, t dzh 150 ns figures 5 and 6, c l = 100pf, s2 closed driver enable to output low, t dzl 150 ns figures 5 and 6, c l = 100pf, s1 closed driver disable time from low, t dlz 100 ns figures 5 and 6, c l = l5pf, s1 closed driver disable time from high, t dhz 100 ns figures 5 and 6, c l = l5pf, s2 closed receiver input-to-output, t rplh , t rphl 106 150 ns figure 7; |v id | $ 2.0v; rise and fall time of v id # l5ns differentialreceiver skew, t rskd 0 10 ns figures 7; |v id | $ 2.0v; |t rplh ? t rphl | rise and fall time of v id # l5ns receiver enable to output low, t rzl 20 50 ns figures 7 and 8, c l = 100pf, s1 closed receiver enable to output high, t rzh 20 50 ns figures 7 and 8, c l = 100pf, s2 closed receiver disable time from low, t rlz 20 50 ns figures 7 and 8, c l = 100pf, s1 closed receiver disable time from high, t rhz 20 50 ns figures 7 and 8, c l = 100pf, s2 closed time to shutdown, t shdn 50 200 600 ns (note 5) driver enable from shutdown 250 ns figures 5 and 6, c l = l5pf, tooutput high, t dzh(shdn) s2 closed driver enable from shutdown 250 ns figures 5 and 6, c l = l5pf, to output low, t dzl(shdn) s1 closed receiver enable from shutdown 3500 ns figures 7 and 8, c l = 100pf, to output high, t rzh(shdn) s2 closed receiver enable from shutdown 3500 ns figures 7 and 8, c l = 100pf, to output low, t rzl(shdn) s1 closed notes 5 the device is put into shutdown by bringing re high and de low. if the enable inputs are in this state for less than 50ns, the device is guaranteed not to enter shut- down. if the enable inputs are in this state for at least 600ns, the device is guaranteed to have entered shutdown.
ADM3082/adm3085/adm3088 ?7? preliminary technical data ADM3082/adm3085/adm3088 test circuits and timing r r v od v oc y z figure 1. driver dc load test circuit r diff v od2 c l1 c l2 3v de di figure 2. test load for driver timing tests di z y v 0 /2 v 0 t df v diff v 0 -v 0 0 90% 10% t dr 90% 10% t skew = |t dplh -t dphl | 5v 0v 1.5v t dplh t dphl v diff = v y - v z figure 3. driver propagation delays ro a b 1v -1v v oh v ol 1.5v t rplh t rphl figure 4. receiver propagation delays v cc s1 s2 test point c rl 15pf 500 v output under test figure 5. test load for driver enable/disable time test 5v 0v de y, z y, z v ol t dzl(shdn) , t dzl t dlz output normally low output normally high 1.5v 2.3v v ol +0.5v v oh -0.5v v ol t dzh(shdn) t dzh t dhz 2.3v figure 6. driver enable and disable times ro test point v cc 1k v 1k v s1 s2 c rl 15pf figure 7. test load for receiver enable/disable time test output normally low output normally high 5v 0v re ro ro t rzl(shdn) , t rzl t rlz 1.5v v ol +0.5v v oh -0.5v 0v t rzh(shdn) , t rzh t rhz 1.5v v cc 1.5v figure 8. receiver enable and disable delay times
ADM3082/adm3085/adm3088 ?8? preliminary technical data absolute maximum ratings supply voltage (v cc ) . . . . . . . . . . . . . . . . . . . . . . . . . . +7v logic input voltage . . . . . . . . . . . . ?0.3v to (v cc +0.3v) driver output voltage (a, b) . . . . . . . . . . . . . . . . . . 13v receiver input voltage (a, b) . . . . . . . . . . . . . . . . . . 13v receiver input voltage, full duplex (a, b) . . . . . . 13v receiver output voltage (ro) . . . ?0.3v to (v cc +0.3v) continuous power dissipation 8-pin plastic dip (derate 9.09mw/ o c above +70 o c) . . . . . . . . . . . 727mw 8-pin plastic so (derate 5.88mw/ o c above +70 o c) . . . . . . . . . . . 471mw maximum junction temperature (t j max) . . . . . . . 150 c storage temperature range . . . . . . . . . ?65c to +150c lead temperature, soldering vapor phase 60 sec . . . . . . . . . . . . . . . . . . . . . . . . . +215c infra-red 15 sec . . . . . . . . . . . . . . . . . . . . . . . . . . . +200c *stresses above those listed under ?absolute maximum ratings? may cause permanent damage to the device. this is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. exposure to absolute maximum rating conditions for extended periods may affect device reliability. thermal characteristics 8-pin plastic dip package q ja = tbd k/watt, q jc = tbd k/watt 8-pin plastic so package q ja = tbd k/watt, q jc = tbd k/watt pin configuration adm3088/ adm3085/ adm3088 top view (not to scale) ro re de di v cc b a gnd 1 2 3 4 8 7 6 5 ordering information model temperature range package option ADM3082jn 0c to +70c 8 pin plastic dip ADM3082jr 0c to +70c 8 pin so ADM3082an ?40c to +85c 8 pin plastic dip ADM3082ar ?40c to +85c 8 pin so adm3085jn 0c to +70c 8 pin plastic dip adm3085jr 0c to +70c 8 pin so adm3085an ?40c to +85c 8 pin plastic dip adm3085ar ?40c to +85c 8 pin so adm3088jn 0c to +70c 8 pin plastic dip adm3088jr 0c to +70c 8 pin so adm3088an ?40c to +85c 8 pin plastic dip adm3088ar ?40c to +85c 8 pin so ADM3082/adm3085/adm3088 typical performance characteristics awa it ing da ta tpc1. no-load supply current vs. temperature awa iting da ta tpc2. output current vs. receiver out- put high voltage awa iting da ta tpc3. output current vs. receiver out- put low voltage
ADM3082/adm3085/adm3088 C9C preliminary technical data awa iting da ta tpc4. receiver output high voltage vs. temperature awa iting da ta tpc5. receiver output low voltage vs. temperature awa iting da ta tpc6. shutdown current vs. temperature awa it ing da ta tpc7. ADM3082 driver propagation delay vs. temperature awa iting da ta tpc8. adm3085 driver propagation delay vs. temperature awa iting da ta tpc9. adm3088 driver propagation delay vs. temperature ADM3082/adm3085/adm3088 typical performance characteristics (continued) awa iting da ta tpc10. ADM3082/5 receiver propagation delay vs. temperature awa it ing da ta tpc11. adm3088 receiver propagation delay vs. temperature awa it ing da ta tpc12. driver differential output volt- age vs. temperature
ADM3082/adm3085/adm3088 ?10? preliminary technical data ADM3082/adm3085/adm3088 typical performance characteristics (continued) awa iting da ta tpc14. output current vs. driver out- put high voltage awa it ing da ta tpc13. driver output current vs. dif- ferential output voltage awa it ing da ta tpc15. output current vs. driver out- put low voltage awa iting da ta tpc18. adm3088 driver propagation delay awa it ing da ta tpc17. adm3085 driver propagation delay awa iting da ta tpc16. ADM3082 driver propagation delay awa iting da ta tpc19. ADM3082/5 receiver propaga- tion delay awa iting da ta tpc20. adm3088 receiver propagation delay
ADM3082/adm3085/adm3088 ?11? preliminary technical data pin function description pin mnemonic description 1 r o receiver output. when re is low and a - b $ (more positive than) ?50mv, ro will be high. when re is low and a ? b # (more negative than) ?200mv, ro will be low. 2 re receiver output enable. take re low to enable ro; ro is high impedance when re is high. take re high and de low to enter low-power shutdown mode. 3 d e driver output enable. take de high to enable driver outputs. these outputs are high impedance when de is low. take re high and de low to enter low-power shutdown mode. 4 d i driver input. with de high, a low on di forces non-inverting output low and inverting output high. similarly, a high on di forces non-inverting output high and inverting output low. 5 gnd ground 6 a non-inverting receiver input and non-inverting driver output 7 b inverting receiver input and inverting driver output 8v cc positive supply 4.75v =v cc =5.25v transmitting inputs outputs re de di b/z a/y x11 0 1 x10 1 0 0 0 x high-z high-z 1 0 x shutdown receiving inputs output re de de de de de a-b a-b a-b a-b a-b ro ro ro ro ro 0x $ -0.05v 1 0x # -0.2v 0 0 x open/shorted 1 1 1 x high-z 1 0 x shutdown x = don?t care shutdown mode, driver and receiver outputs high impedance device truth tables
ADM3082/adm3085/adm3088 ?12? preliminary technical data detailed description the ADM3082, adm3085 and adm3088 are high- speed rs-485/rs-422 transceivers offering enhanced per- formance over industry-standard devices all devices in the family contain one driver and one receiver, but there is a choice of performance options. the devices feature fail- safe operation, which means that a logic-high receiver out- put is guaranteed when the receiver inputs are open-circuit or short-circuit, or when they are connected to a termi- nated transmission line with all drivers disabled (see the section on fail-safe operation). slew rate control the ADM3082 features a controlled slew-rate driver that minimize electromagnetic interference (emi) and reduce reflections caused by incorrectly terminated cables, allow- ing error-free data transmission rates up to 115kbps (see the section on reduced emi and reflections). the adm3085 offers a higher limit on driver output slew-rate, allowing data transmission rates up to 500kbps. the driver slew rate of the adm3088 is not limited, of- fering data transmission rates up to 10mbps. receiver input filtering the receivers of all devices incorporate input hysteresis. in addition, when operating in 115kbps or 500kbps mode, the receivers of the ADM3082 and adm3085 incorporate input filtering. this enhances noise immunity with differ- ential signals that have very slow rise and fall times, but it does increase propagation delay by 20%. half-/full-duplex operation the ADM3082, adm3085, and adm3088 are dedicated half-duplex devices (driver outputs internally linked to re- ceiver inputs). figure 29 shows a typical half-duplex con- nection between two devices. three-state bus connection all the devices have a driver enable pin (de) that en- ables the driver outputs when taken high or puts the driver outputs into a high-impedance state when taken low. this allows several driver outputs to be connected to an rs-422/rs-485 bus. similarly, all the devices have a (active-low) receiver en- able pin ( re ). taking this low enables the receiver, while taking it high puts the receiver outputs into a high-imped- ance state. this allows several receiver outputs to be con- nected to a serial data bus. high input impedance the input impedance of the devices is 96k v , which is 8 times higher than the standard rs-485 load of 12k v . a standard driver can driver 32 standard loads, so up to 256 adm308x receivers, or a combination of adm308x and other devices up to 32 unit loads, may be connected to an rs-422/rs485 bus driven by a single driver. shutdown mode all the devices have a low power shutdown mode that is enabled by taking re high and de low. if shutdown mode is not used, the fact that de is active- high and re is active-low offers a convenient way of switching the device between transmit and receive, by ty- ing de and re together. this is useful, for example, in applications using half duplex operation and where several receiver outputs are connected to a serial bus. the device is guaranteed not to enter shutdown mode if de and re are driven in this way. if de is low and re is high for less than 50ns the device will not enter shutdown. if de is low and re is high for greater than 600ns, the device is guaranteed to enter shutdown. fail-safe operation the ADM3082/adm3085/adm3088 offer true fail-safe operation while remaining fully compliant with the 200mv eia/tia-485 standard. a logic-high receiver output is guaranteed when the receiver inputs are shorted together or open-circuit, or when they are connected to a terminated transmission line with all drivers disabled. this is done by setting the receiver threshold between -50mv and C200mv. if the differential receiver input volt- age (aCb) is greater than or equal to C50mv, ro is logic high. if aCb is less than or equal to C200mv, ro is logic low. in the case of a terminated bus with all transmitters disabled, the receivers differential input voltage is pulled to 0v by adm308x family, which results in a logic high with a 50mv minimum noise margin. enhanced esd protection all analog devices parts incorporate protection against electrostatic discharge (esd) to protect the devices dur- ing handling, assembly and normal operation. in addition, the adm308x family has enhanced esd protection up to 15kv on the receiver inputs and driver outputs (a, b) to protect against severe operational conditions such as line transients, connection and disconnection. 100n +5v (v cc ) +5v (v cc ) 100n r t r t data in (di) receiver output (ro) data in (di) receiver output (ro) 1 2 3 4 8 7 6 5 d r d r receiver enable ( re) driver enable (de) 5 6 7 8 4 3 2 1 receiver enable ( re) driver enable (de) ADM3082/5/8 ADM3082/5/8 figure 29. half-duplex configuration for ADM3082, adm3085 or adm3088
ADM3082/adm3085/adm3088 ?13? preliminary technical data current limit and thermal shutdown the ADM3082/adm3085/adm3088 incorporate two protection mechanisms to guard the drivers against short- circuits, bus contention or other fault conditions. the first is a foldback current-limited output stage that protects the driver against short-circuits over the entire common-mode voltage range. the second is a thermal shutdown circuit that puts the driver outputs into a high-impedance state if the die temperature exceeds a safe limit. reduced emi and reflections the ADM3082 and adm3085 incorporate slew-rating lim- iting in the drivers. this reduces reflections due to incor- rect cable termination and minimizes electromagnetic interference (emi). figures 9 to 11 show driver output waveforms and fourier analyses of 20khz signals for the three different slew-rate settings. it can be seen that the harmonic content is greatly reduced for the adm3085 and still further for the ADM3082 (figures 10 and 9 respectively). awa it ing da ta figure 9 ADM3082 driver output waveform and fft plot awa it ing da ta figure 10. adm3085 driver output waveform and fft plot awa it ing da ta figure 11. adm3088 driver output waveform and fft plot the length of an unterminated stub that can be driven with only minor reflections depends on the rise time of the transmitter. a conservative estimate for this is given by the following equation: l (metres) = t r / 49.2 where t r is the transmitter?s rise time in ns (multiply re- sult by 3.28 for answer in feet). for example, the rise time of the ADM3082 is typically 1320ns, which results in acceptable waveforms with stub lengths up to 27 metres. this is not the ultimate limit on unterminated stub length, as a system can still work if the waveformis allowed to settle before sampling the data. the rs-485/rs-422 standard covers line lengths up to 4000 feet (1219 metres). driver output and receiver out- put waveforms for the three slew rate settings, driving a 4000 foot cable, are shown in figures 12 to 14. awa iting da ta figure 12. driver input, driver output and receiver output waveforms of ADM3082, driving 4000ft (1219m) of cable at 50khz
ADM3082/adm3085/adm3088 ?14? preliminary technical data awa iting da ta figure 13. driver input, driver output and receiver output waveforms of adm3085, driving 4000ft (1219m) of cable at 50khz awa iting da ta figure 14. driver input, driver output and receiver output waveforms of adm3088, driving 4000ft (1219m) of cable at 200khz for line lengths in excess of 1220 metres the line should be split into smaller sections with intermediate repeaters. applications figures 15 shows a typical application of the device on a half--duplex network. the line should be terminated at both ends to minimize reflections and any stubs off the main line should be kept as short as possible. 120 v ro di re de a b d r 120 v ro di re de a b d r ro di re de a b d r ro di re de a b d r ADM3082, adm 3084, adm3085 or adm3089 with h/ f = v cc figure 15. typical half-duplex network application outline dimensions dimensions shown in inches and (mm). 8-pin plastic dual-in-line package (n-8) 8 14 5 0.430 (10.92) 0.348 (8.84) 0.280 (7.11) 0.240 (6.10) pin 1 seating plane 0.022 (0.558) 0.014 (0.356) 0.060 (1.52) 0.015 (0.38) 0.210 (5.33) max 0.130 (3.30) min 0.070 (1.77) 0.045 (1.15) 0.100 (2.54) bsc 0.160 (4.06) 0.115 (2.93) 0.325 (8.25) 0.300 (7.62) 0.015 (0.381) 0.008 (0.204) 0.195 (4.95) 0.115 (2.93) 8-pin so package (r-8) 85 4 1 0.1968 (5.00) 0.1890 (4.80) 0.1574 (4.00) 0.1497 (3.80) 0.2440 (6.20) 0.2284 (5.80) pin 1 seating plane 0.0098 (0.25) 0.0040 (0.10) 0.0192 (0.49) 0.0138 (0.35) 0.102 (2.59) 0.094 (2.39) 0.0500 (1.27) bsc 0.0098 (0.25) 0.0075 (0.19) 0.0500 (1.27) 0.0160 (0.41) 8 0 0.0196 (0.50) 0.0099 (0.25) x 45

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