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3.3 v, 15 kv esd-protected, half- and full-duplex, rs-485/rs-422 transceivers adm3070e/adm3071e /adm3072e/adm3073e/adm3074e/adm3075e/adm3076e/adm3077e/adm3078e rev. a 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 that may result from its use. specifications subject to change without notice. no license is granted by implication or otherwise under any patent or patent rights of analog devices. trademarks and registered trademarks are the property of their respective owners. one technology way, p.o. box 9106, norwood, ma 02062-9106, u.s.a. tel: 781.329.4700 www.analog.com fax: 781.461.3113 ?2006 analog devices, inc. all rights reserved. features tia/eia rs-485/rs-422 compliant 15 kv esd protection on rs-485 input/output pins data rates adm3070e/adm3071e/adm3072e: 250 kbps adm3073e/adm3074e/adm3075e: 500 kbps adm3076e/adm3077e/adm3078e: 16 mbps half- and full-duplex options true fail-safe receiver inputs up to 256 nodes on the bus ?40c to +125c temperature option hot-swap input structure on de and re pins reduced slew rates for low emi low power shutdown current (all except adm3071e/adm3074e/adm3077e) outputs high-z when disabled or powered off common-mode input range: ?7 v to +12 v thermal shutdown and short-circuit protection 8-lead and 14-lead narrow soic packages applications power/energy metering industrial control lighting systems telecommunications security systems instrumentation general description the adm3070e to adm3078e are 3.3 v, low power data transceivers with 15 kv esd protection suitable for full- and half-duplex communication on multipoint bus transmission lines. they are designed for balanced data transmission, and they comply with tia/eia standards rs-485 and rs-422. the devices have an ? unit load receiver input impedance, which allows up to 256 transceivers on a bus. because only one driver should be enabled at any time, the output of a disabled or powered-down driver is tristated to avoid overloading the bus. the receiver inputs have a true fail-safe feature, which eliminates the need for external bias resistors and ensures a logic high output level when the inputs are open or shorted. this guarantees that the receiver outputs are in a known state before communication begins and when communication ceases. functional block diagrams adm3070e/ adm3073e/ adm3076e ro re de di v cc a b z y gnd r d 06285-001 figure 1. adm3071e/ adm3074e/ adm3077e ro di v cc a b z y gnd r d 0 6285-002 . figure 2. adm3072e/ adm3075e/ adm3078e ro re de di v cc a b gnd d r 06285-003 figure 3. (continued on page 3)
adm3070e/adm3071e /adm3072e/adm3073e/ad m3074e/adm3075e /adm3076e/adm3077e/adm3078e rev. a | page 2 of 20 table of contents features .............................................................................................. 1 applications....................................................................................... 1 general description ......................................................................... 1 functional block diagrams............................................................. 1 revision history ............................................................................... 2 specifications..................................................................................... 4 timing specificationsadm3070e/adm3071e/ adm3072e.................................................................................... 5 timing specificationsadm3073e/adm3074e/ adm3075e.................................................................................... 6 timing specificationsadm3076e/adm3077e/ adm3078e.................................................................................... 7 absolute maximum ratings............................................................ 8 esd caution.................................................................................. 8 pin configurations and function descriptions ........................... 9 test circuits and switching characteristics................................ 10 typical performance characteristics ........................................... 12 circuit description......................................................................... 15 function tables........................................................................... 15 receiver fail-safe ....................................................................... 15 hot-swap capability .................................................................. 16 line length vs. data rate ......................................................... 16 15 kv esd protection ............................................................. 16 human body model .................................................................. 16 256 transceivers on the bus...................................................... 16 reduced emi and reflections .................................................. 16 low power shutdown mode..................................................... 17 driver output protection.......................................................... 17 typical applications................................................................... 17 outline dimensions ....................................................................... 19 ordering guide .......................................................................... 20 revision history 10/06rev. 0 to rev. a added adm3077e and adm3078e ...............................universal changes to figure 2 and figure 3................................................... 1 changes to figure 5 and figure 6................................................... 9 changes to figure 34 and figure 35............................................. 17 updated outline dimensions ....................................................... 19 changes to ordering guide .......................................................... 20 8/06revision 0: initial version
adm3070e/adm3071e /adm3072e/adm3073e/adm3 074e/adm3075e/adm3076e/adm3077e/adm3078e rev. a | page 3 of 20 general description (continued from page 1) the driver outputs of the 250 kbps and 500 kbps devices are slew rate limited, in order to reduce emi and data errors caused by reflections from improperly terminated buses. excessive power dissipation caused by bus contention or by output shorting is prevented with a thermal shutdown circuit. the parts are fully specified over the industrial tem- perature ranges and are available in 8-lead and 14-lead narrow soic packages. table 1. selection table part no. half/full duplex data rate (mbps) slew rate limited driver/receiver enable low power shutdown nodes on bus 15 kv esd on bus pins pin count adm3070e full 0.25 yes yes yes 256 yes 14 adm3071e full 0.25 yes no no 256 yes 8 adm3072e half 0.25 yes yes yes 256 yes 8 adm3073e full 0.5 yes yes yes 256 yes 14 adm3074e full 0.5 yes no no 256 yes 8 adm3075e half 0.5 yes yes yes 256 yes 8 adm3076e full 16 no yes yes 256 yes 14 adm3077e full 16 no no no 256 yes 8 adm3078e half 16 no yes yes 256 yes 8
adm3070e/adm3071e /adm3072e/adm3073e/ad m3074e/adm3075e /adm3076e/adm3077e/adm3078e rev. a | page 4 of 20 specifications v cc = 3.3 v 10%, t a = t min to t max , unless otherwise noted. table 2. adm3070e/adm3071e/adm3072e/adm3073e /adm3074e/adm3075e/adm3076e/adm3077e/adm3078e parameter symbol min typ max unit test conditions/comments driver differential outputs differential output voltage v od 2.0 v cc v r l = 100 (rs-422) (see figure 7 ) 1.5 v cc v r l = 54 (rs-485) (see figure 7 ) v cc v no load |v od | for complementary output states 1 v od 0.2 v r = 54 or 100 (see figure 7 ) common-mode output voltage v oc v cc /2 3 v r = 54 or 100 (see figure 7 ) |v oc | for complementary output states 1 v oc 0.2 v r = 54 or 100 (see figure 7 ) short-circuit output current i osd 40 250 ma 0 v < v out < 12 v ? 250 ? 40 ma ? 7 v < v out < v cc short-circuit foldback output current i osdf 20 ma (v cc ? 1 v) < v out < 12 v ? 20 ma ? 7 v < v out < +1 v output leakage (y, z) full duplex i o 125 a de = 0 v, re = 0 v, v cc = 0 v or 3.6 v, v in = 12 v ? 100 a de = 0 v, re = 0 v, v cc = 0 v or 3.6 v, v in = ?7 v logic inputs input high voltage v ih 2.0 v de, di, re input low voltage v il 0.8 v de, di, re input hysteresis v hys 100 mv de, di, re logic input current i in1 1 a de, di, re input impedance first transition 1 10 k de thermal shutdown threshold t ts 175 c thermal shutdown hysteresis t tsh 15 c receiver differential inputs differential input threshold voltage v th ? 200 ? 125 ? 50 mv ? 7 v < v cm < +12 v input hysteresis v th 15 mv v a + v b = 0 v input resistance (a, b) r in 96 k ? 7 v < v cm < +12 v input current (a, b) i a, b 125 a de = 0 v, v cc = 0 v or 3.6 v, v in = 12 v ? 100 a de = 0 v, v cc = 0 v or 3.6 v, v in = ?7 v ro logic output output high voltage v oh v cc ? 0.6 v i out = ?1 ma output low voltage v ol 0.4 v i out = 1 ma short-circuit output current i osr 80 ma 0 v < v ro < v cc tristate output leakage current i ozr 1 a v cc = 3.6 v, 0 v < v out < v cc power supply supply current i cc 0.8 1.5 ma no load, de = v cc , re = 0 v 0.8 1.5 ma no load, de = v cc , re = v cc 0.8 1.5 ma no load, de = 0 v, re = 0 v shutdown current i shdn 0.05 10 a de = 0 v, re = v cc esd protection a, b, y, z pins 15 kv human body model all pins except a, b, y, z pins 4 kv human body model 1 |v od | and |v oc | are the changes in v od and v oc , respectively, when the di input changes state.
adm3070e/adm3071e /adm3072e/adm3073e/adm3 074e/adm3075e/adm3076e/adm3077e/adm3078e rev. a | page 5 of 20 timing specificationsa dm3070e/adm3071e/ adm3072e v cc = 3.3 v 10%, t a = t min to t max , unless otherwise noted. table 3. parameter symbol min typ max unit test conditions/comments driver maximum data rate 250 kbps propagation delay, low to high level t dplh 250 1500 ns c l = 50 pf, r l = 54 (see figure 8 and figure 9 ) propagation delay, high to low level t dphl 250 1500 ns c l = 50 pf, r l = 54 (see figure 8 and figure 9 ) rise time/fall time t dr /t df 350 1600 ns c l = 50 pf, r l = 54 (see figure 8 and figure 9 ) |t dplh ? t dphl | differential driver output skew t dskew 200 ns c l = 50 pf, r l = 54 (see figure 8 and figure 9 ) enable to output high t dzh 2500 ns (see figure 10 ) enable to output low t dzl 2500 ns (see figure 11 ) disable time from low t dlz 100 ns (see figure 11 ) disable time from high t dhz 100 ns (see figure 10 ) enable time from shutdown to high t dzh(shdn) 5500 ns (see figure 10 ) enable time from shutdown to low t dzl(shdn) 5500 ns (see figure 11 ) receiver maximum data rate 250 kbps propagation delay, low to high level t rplh 200 ns c l = 15 pf (see figure 12 and figure 13 ) propagation delay, high to low level t rphl 200 ns c l = 15 pf (see figure 12 and figure 13 ) |t rplh ? t rphl | output skew t rskew 30 ns c l = 15 pf (see figure 12 and figure 13 ) enable to output high t rzh 50 ns (see figure 14 ) enable to output low t rzl 50 ns (see figure 14 ) disable time from low t rlz 50 ns (see figure 14 ) disable time from high t rhz 50 ns (see figure 14 ) enable time from shutdown to high t rzh(shdn) 4000 ns (see figure 14 ) enable time from shutdown to low t rzl(shdn) 4000 ns (see figure 14 ) time to shutdown t shdn 50 200 600 ns
adm3070e/adm3071e /adm3072e/adm3073e/ad m3074e/adm3075e /adm3076e/adm3077e/adm3078e rev. a | page 6 of 20 timing specificationsa dm3073e/adm3074e/ adm3075e v cc = 3.3 v 10%, t a = t min to t max , unless otherwise noted. table 4. parameter symbol min typ max unit test conditions/comments driver maximum data rate 500 kbps propagation delay, low to high level t dplh 180 800 ns c l = 50 pf, r l = 54 (see figure 8 and figure 9 ) propagation delay, high to low level t dphl 180 800 ns c l = 50 pf, r l = 54 (see figure 8 and figure 9 ) rise time/fall time t dr /t df 200 800 ns c l = 50 pf, r l = 54 (see figure 8 and figure 9 ) |t dplh ? t dphl | differential driver output skew t dskew 100 ns c l = 50 pf, r l = 54 (see figure 8 and figure 9 ) enable to output high t dzh 2500 ns (see figure 10 ) enable to output low t dzl 2500 ns (see figure 11 ) disable time from low t dlz 100 ns (see figure 11 ) disable time from high t dhz 100 ns (see figure 10 ) enable time from shutdown to high t dzh(shdn) 4500 ns (see figure 10 ) enable time from shutdown to low t dzl(shdn) 4500 ns (see figure 11 ) receiver maximum data rate 500 kbps propagation delay, low to high level t rplh 200 ns c l = 15 pf (see figure 12 and figure 13 ) propagation delay, high to low level t rphl 200 ns c l = 15 pf (see figure 12 and figure 13 ) |t rplh ? t rphl | output skew t rskew 30 ns c l = 15 pf (see figure 12 and figure 13 ) enable to output high t rzh 50 ns (see figure 14 ) enable to output low t rzl 50 ns (see figure 14 ) disable time from low t rlz 50 ns (see figure 14 ) disable time from high t rhz 50 ns (see figure 14 ) enable time from shutdown to high t rzh(shdn) 4000 ns (see figure 14 ) enable time from shutdown to low t rzl(shdn) 4000 ns (see figure 14 ) time to shutdown t shdn 50 200 600 ns
adm3070e/adm3071e /adm3072e/adm3073e/adm3 074e/adm3075e/adm3076e/adm3077e/adm3078e rev. a | page 7 of 20 timing specificationsa dm3076e/adm3077e/ adm3078e v cc = 3.3 v 10%, t a = t min to t max , unless otherwise noted. table 5. parameter symbol min typ max unit test conditions/comments driver maximum data rate 16 mbps propagation delay, low to high level t dplh 50 ns c l = 50 pf, r l = 54 (see figure 8 and figure 9 ) propagation delay, high to low level t dphl 50 ns c l = 50 pf, r l = 54 (see figure 8 and figure 9 ) rise time/fall time t dr /t df 15 ns c l = 50 pf, r l = 54 (see figure 8 and figure 9 ) |t dplh ? t dphl | differential driver output skew t dskew 8 ns c l = 50 pf, r l = 54 (see figure 8 and figure 9 ) enable to output high t dzh 150 ns (see figure 10 ) enable to output low t dzl 150 ns (see figure 11 ) disable time from low t dlz 100 ns (see figure 11 ) disable time from high t dhz 100 ns (see figure 10 ) enable time from shutdown to high t dzh(shdn) 1250 1800 ns (see figure 10 ) enable time from shutdown to low t dzl(shdn) 1250 1800 ns (see figure 11 ) receiver maximum data rate 16 mbps propagation delay, low to high level t rplh 40 75 ns c l = 15 pf (see figure 12 and figure 13 ) propagation delay, high to low level t rphl 40 75 ns c l = 15 pf (see figure 12 and figure 13 ) |t rplh ? t rphl | output skew t rskew 8 ns c l = 15 pf (see figure 12 and figure 13 ) enable to output high t rzh 50 ns (see figure 14 ) enable to output low t rzl 50 ns (see figure 14 ) disable time from low t rlz 50 ns (see figure 14 ) disable time from high t rhz 50 ns (see figure 14 ) enable time from shutdown to high t rzh(shdn) 1800 ns (see figure 14 ) enable time from shutdown to low t rzl(shdn) 1800 ns (see figure 14 ) time to shutdown t shdn 50 200 600 ns
adm3070e/adm3071e /adm3072e/adm3073e/ad m3074e/adm3075e /adm3076e/adm3077e/adm3078e rev. a | page 8 of 20 absolute maximum ratings t a = 25c, unless otherwise noted. table 6. parameter rating v cc to gnd ?0.3 v to +6 v digital input/output voltage (de, re , di) ?0.3 v to +6 v receiver output voltage (ro) ?0.3 v to (v cc + 0.3 v) driver output (a, b, y, z)/receiver input (a, b) voltage ?8 v to +13 v driver output current 250 ma operating temperature range adm307xea_ ?40c to +85c adm307xey_ ?40c to +125c storage temperature range ?65c to +150c ja thermal impedance 8-lead soic_n 158c/w 14-lead soic_n 120c/w lead temperature, soldering (20 sec) 260c 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. esd caution
adm3070e/adm3071e /adm3072e/adm3073e/adm3 074e/adm3075e/adm3076e/adm3077e/adm3078e rev. a | page 9 of 20 pin configurations and function descriptions nc 1 ro 2 re 3 de 4 v cc 14 nc 13 a 12 b 11 di 5 z 10 gnd 6 y 9 gnd 7 nc 8 nc = no connect adm3070e/ adm3073e/ adm3076e top view (not to scale) 06285-004 v cc 1 ro 2 di 3 gnd 4 a 8 b 7 z 6 y 5 adm3071e/ adm3074e/ adm3077e top view (not to scale) 06285-005 ro 1 re 2 de 3 di 4 v cc 8 b 7 a 6 gnd 5 adm3072e/ adm3075e/ adm3078e top view (not to scale) 06285-006 figure 4. adm3070e/adm3073e/adm3076e pin configuration figure 5. adm3071e/adm3074e/adm3077e pin configuration figure 6. adm3072e/adm3075e/adm3078e pin configuration table 7. pin function descriptions adm3070e/ adm3073e/ adm3076e pin no. adm3071e/ adm3074e/ adm3077e pin no. adm3072e/ adm3075e/ adm3078e pin no. mnemonic description 2 2 1 ro receiver output. when enabled, if (a ? b) ?50 mv, ro is high. if (a ? b) ?200 mv, ro is low. 3 n/a 2 re receiver output enable. a low level enables the receiver output. a high level places it in a high impedance state. if re is high and de is low, the device enters a low power shutdown mode. 4 n/a 3 de driver output enable. a high level enables the driver differential a and b outputs. a low level places it in a high impedance state. if re is high and de is low, the device enters a low power shutdown mode. 5 3 4 di driver input. with a half-duplex part when the driver is enabled, a logic low on di forces a low and b high; a logic high on di forces a high and b low. with a full-duplex part when the driver is enabled, a logic low on di forces y low and z high; a logic high on di forces y high and z low. 6, 7 4 5 gnd ground. 9 5 n/a y noninverting driver output. n/a n/a 6 a noninverting receiver inp ut a and noninverting driver output a. 12 8 n/a a noninverting receiver input a. 10 6 n/a z inverting driver output. n/a n/a 7 b inverting receiver input b and inverting driver output b. 11 7 n/a b inverting receiver input b. 14 1 8 v cc power supply, 3.3 v 10%. bypass v cc to gnd with a 0.1 f capacitor. 1, 8, 13 n/a n/a nc no connect. not intern ally connected. can be connected to gnd.
adm3070e/adm3071e /adm3072e/adm3073e/ad m3074e/adm3075e /adm3076e/adm3077e/adm3078e rev. a | page 10 of 20 test circuits and switching characteristics v oc r l /2 r l /2 z y 06285-007 v od figure 7. driver dc test load di de y z 3v c l r l v od 06285-008 figure 8. driver timing test circuit v cc t dplh t dr t df t dphl 0v v cc /2 1/2v o 1/2v o di z y v o +v o ?v o v diff 10% 90% 90% 10% v diff = v (y) ? v (z) t dskew = | t dplh ? t dphl | 0v 06285-009 figure 9. driver propagation delays out s1 0v or 3v generator r l 500 ? 50 ? de out c l 50pf + t dzh , t dzh(shdn) v om = (0 + v oh )/2 t dhz v cc /2 0.25v v cc 0v v oh 0v d 06285-010 figure 10. driver enable and disable times (t dhz, t dzh , t dzh(shdn) ) out s1 v cc 0v or 3v generator r l 500 ? 50 ? de out c l 50pf + t dzl , t dzl(shdn) v om = (v ol + v cc )/2 t dlz v cc /2 0.25v v cc v cc 0v v ol d 06285-011 figure 11. driver enable and disable times (t dzl, t dlz , t dzl(shdn) ) v id ate b r receiver output a 06285-012 figure 12. receiver propagation delay test circuit notes 1. the rise time and fall time of input a and input b < 4ns. a b ro v ol v oh 1.5v +1 v ?1v t rphl t rplh 06285-013 figure 13. receiver propagation delays
adm3070e/adm3071e /adm3072e/adm3073e/adm3 074e/adm3075e/adm3076e/adm3077e/adm3078e rev. a | page 11 of 20 t rzh , t rzh(shdn) t rzl , t rzl(shdn) (v ol + v cc )/2 t rhz 1.5v t rlz 1.5v 1.5v 0 . 2 5 v 3v 0v v cc v ol 3v 0v v cc v ol 3v 0v v oh 0v 3v 0v v oh v oh /2 0v 0 . 2 5 v v cc s3 s1 ?1.5v +1.5 v generator 1k ? 50 ? c l 15pf + v id s2 s1 closed s2 open s3 = ?1.5v s1 open s2 closed s3 = +1.5v s1 closed s2 open s3 = ?1.5v s1 open s2 closed s3 = +1.5v re ro re ro re ro re ro 06285-014 figure 14. receiver enable and disable times
adm3070e/adm3071e /adm3072e/adm3073e/ad m3074e/adm3075e /adm3076e/adm3077e/adm3078e rev. a | page 12 of 20 typical performance characteristics 06285-020 1.2 0.5 ?40 temperature (c) supply current (ma) ?10 20 50 80 1.1 1.0 0.9 0.8 0.7 0.6 110 figure 15. supply current vs. temperature 06285-021 03 . 5 output high voltage (v) 0.51.01.52.02.53.0 ? 18 0 output current (ma) ?16 ?14 ?12 ?10 ?8 ?6 ?4 ?2 output low voltage (v) output current (ma) figure 16. output current vs. receiver output high voltage 06285-022 25 0 03 . 5 0.51.01.52.02.53.0 20 15 10 5 figure 17. output current vs. receiver output low voltage 06285-023 3.30 3.00 ?50 125 temperature (c) output high voltage (v) 3.25 3.20 3.15 3.10 3.05 ?25 0 25 50 75 100 i ro = ?1ma figure 18. receiver output high voltage vs. temperature 06285-024 0.7 0 ?50 125 temperature (c) output low voltage (v) 0.6 0.5 0.4 0.3 0.2 0.1 ?25 0 25 50 75 100 i ro = 1ma 06285-025 100 0 03 . 5 differential output voltage (v) output current (ma) figure 19. receiver output low voltage vs. temperature 0.51.01.52.02.53.0 90 80 70 60 50 40 30 20 10 figure 20. driver output current vs. differential output voltage
adm3070e/adm3071e /adm3072e/adm3073e/adm3 074e/adm3075e/adm3076e/adm3077e/adm3078e rev. a | page 13 of 20 06285-026 2.6 1.6 ?50 125 temperature (c) differential output voltage (v) ?25 0 25 50 75 100 2.5 2.4 2.3 2.2 2.1 2.0 1.9 1.8 1.7 r l = 54 ? figure 21. driver differential output voltage vs. temperature 06285-027 output high voltage (v) output current (ma) 0 20 40 60 80 100 120 ?7 ?6 ?5 ?4 ?3 ?2 ?1 0 1 2 3 4 figure 22. output current vs. driver output high voltage 06285-028 output low voltage (v) output current (ma) 0 20 40 60 80 100 120 024681012 figure 23. output current vs . driver output low voltage 06285-029 0.9 0 ?50 125 temperature (c) shutdown current (a) ?25 0 25 50 75 100 0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 figure 24. shutdown current vs. temperature 06285-030 temperature (c) propagation delay (ns) 0 200 400 600 800 1000 1200 ?40 25 125 t dplh t dphl figure 25. adm3070e/adm3071e/adm3072e driver propagation delay vs. temperature (250 kbps) 06285-031 temperature (c) propagation delay (ns) ?40 25 0 100 200 300 400 500 600 700 125 t dplh t dphl figure 26. adm3073e/adm3074e/adm3075e driver propagation delay vs. temperature (500 kbps)
adm3070e/adm3071e /adm3072e/adm3073e/ad m3074e/adm3075e /adm3076e/adm3077e/adm3078e rev. a | page 14 of 20 06285-032 35 0 ?50 125 temperature (c) propagation delay (ns) 30 25 20 15 10 5 ?25 0 25 50 75 100 t dplh t dphl figure 27. adm3076e/adm3077e/adm3078e driver propagation delay vs. temperature (16 mbps) 06285-033 70 0 ?50 125 temperature (c) propagation delay (ns) 60 50 40 30 20 10 ?25 0 25 50 75 100 t dphl t dplh figure 28. receiver propagation delay vs. temperature 06285-034 ch3 2.0v 20ns/pt math1 2.01v 1.0s m1.0s 50ms/s a ch2 1.24v 3 m1 v y ? v z di figure 29. adm3070e/adm3071e/adm3072e driver propagation delay (250 kbps) 06285-036 ch3 2.0v 8ns/pt math1 2.01v 400ns m400s 125ms/s a ch2 1.24v 3 m1 v y ? v z di figure 30. adm3073e/adm3074e/adm3075e driver propagation delay (500 kbps) 06285-037 ch3 2.0v it 400ps/pt math1 1.0v 20ns m20ns 1.25gs/s a ch3 1.64v 3 m1 di v y ? v z ? figure 31. adm3076e/adm3077e/adm3078e driver propagation delay (16 mbps) 06285-035 ch3 2.0v 4ns/pt math1 2.01v 200ns m200ns 250ms/s a ch2 1.24v 3 m1 v a ? v b ro ? figure 32. receiver propagation delay
adm3070e/adm3071e /adm3072e/adm3073e/adm3 074e/adm3075e/adm3076e/adm3077e/adm3078e rev. a | page 15 of 20 circuit description the adm307xe series are high speed transceivers for rs-485 and rs-422 communications. each device contains one driver and one receiver. all devices feature fail-safe circuitry, which 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 (see the receiver fail- safe section). the adm307xe also feature a hot-swap capa- bility, allowing line insertion without erroneous data transfer (see the hot-swap capability section). the adm3070e/ adm3071e/adm3072e feature reduced slew rate drivers that minimize emi and reduce reflections caused by improperly terminated cables, allowing for error-free data transmission at rates up to 250 kbps. the adm3073e/adm3074e/adm3075e also offer slew rate limits, allowing transmit speeds up to 500 kbps. the adm3076e/ adm3077e/adm3078e driver slew rates are not limited, making possible transmit speeds of up to 16 mbps. the adm3072e/adm3075e/adm3078e are half-duplex trans- ceivers; the adm3070e/adm3071e/adm3073e/adm3074e/ adm3076e/adm3077e are each full-duplex transceivers. all devices operate from a single 3.3 v supply. drivers are output short-circuit current limited, and thermal shutdown circuitry protects drivers against excessive power dissipation. when activated, the thermal shutdown circuitry places the driver outputs into a high impedance state. function tables adm3070e/adm3073e/adm3076e table 8. transmitting truth table transmitting inputs transmitting outputs re de di y z x 1 1 1 1 0 x 1 1 0 0 1 0 0 x 1 high-z 2 high-z 2 1 0 x 1 shutdown shutdown 1 x = don't care. 2 high-z = high impedance. table 9. receiving truth table receiving inputs receiving outputs re de a C b ro 0 x 1 ?50 mv 1 0 x 1 ?200 mv 0 0 x 1 open/shorted 1 1 1 x 1 high-z 2 1 0 x 1 shutdown 1 x = don't care. 2 high-z = high impedance. adm3071e/adm3074e/adm3077e table 10. transmitting truth table transmitting input transmitting outputs di y z 1 1 0 0 0 1 table 11. receiving truth table receiving input receiving output a C b ro ?50 mv 1 ?200 mv 0 open/shorted 1 adm3072e/adm3075e/adm3078e table 12. transmitting truth table transmitting inputs transmitting outputs re de di a, y b, z x 1 1 1 1 0 x 1 1 0 0 1 0 0 x 1 high-z 2 high-z 2 1 0 x 1 shutdown shutdown 1 x = don't care. 2 high-z = high impedance. table 13. receiving truth table receiving inputs receiving output re de a C b ro 0 0 ?50 mv 1 0 0 ?200 mv 0 0 0 open/shorted 1 1 1 x 1 high-z 2 1 0 x 1 shutdown 1 x = don't care. 2 high-z = high impedance. receiver fail-safe the adm307xe family guarantees a logic high receiver output when the receiver inputs are shorted, open, or connected to a terminated transmission line with all drivers disabled. this is done by setting the receiver input threshold between ?50 mv and ?200 mv. if the differential receiver input voltage (a ? b) is greater than or equal to ?50 mv, ro is logic high. if a ? b is less than or equal to ?200 mv, ro is logic low. in the case of a terminated bus with all transmitters disabled, the receiver differential input voltage is pulled to 0 v by the termination. with the receiver thresholds of the adm307xe family, this results in a logic high with a 50 mv minimum noise margin.
adm3070e/adm3071e /adm3072e/adm3073e/ad m3074e/adm3075e /adm3076e/adm3077e/adm3078e rev. a | page 16 of 20 hot-swap capability (all except adm3071e/adm3074e/adm3077e) hot-swap inputs when a circuit board is inserted into a hot, or powered, backplane, differential disturbances to the data bus can lead to data errors. during this period, processor logic output drivers are high impedance and are unable to drive the de and re inputs of the rs-485 transceivers to a defined logic level. leakage currents up to 10 a from the high impedance state of the processor logic drivers can cause standard cmos enable inputs of a transceiver to drift to an incorrect logic level. additionally, parasitic circuit board capacitance can cause coupling of v cc or gnd to the enable inputs. without the hot- swap capability, these factors can improperly enable the driver or receiver of the transceiver. when v cc rises, an internal pull- down circuit holds de low and re high. after the initial power- up sequence, the pull-down circuit becomes transparent, resetting the hot-swap tolerable input. line length vs. data rate the rs-485/rs-422 standard covers line lengths up to 4000 feet. for line lengths greater than 4000 feet, figure 37 illustrates an example line repeater. 15 kv esd protection two coupling methods are used for esd testing: contact discharge and air-gap discharge. contact discharge calls for a direct connection to the unit being tested. air-gap discharge uses a higher test voltage but does not make direct contact with the test unit. with air-gap discharge, the discharge gun is moved toward the unit under test, developing an arc across the air gap, therefore the term air-gap discharge. this method is influenced by humidity, temperature, barometric pressure, distance, and rate of closure of the discharge gun. the contact discharge method, while less realistic, is more repeatable and is gaining acceptance and preference over the air-gap method. although very little energy is contained within an esd pulse, the extremely fast rise time, coupled with high voltages, can cause failures in unprotected semiconductors. catastrophic destruction can occur immediately as a result of arcing or heating. even if catastrophic failure does not occur immediately, the device can suffer from parametric degradation that can result in degraded performance. the cumulative effects of continuous exposure can eventually lead to complete failure. input/output lines are particularly vulnerable to esd damage. simply touching or connecting an input/output cable can result in a static discharge that damages or completely destroys the interface product connected to the input/output port. it is extremely important, therefore, to have high levels of esd protection on the input/output lines. the esd discharge can induce latch-up in the device under test, so it is important that esd testing on the input/output pins be carried out while device power is applied. this type of testing is more representative of a real-world input/output discharge, which occurs when equipment is operating normally. the transmitter outputs and receiver inputs of the adm307xe family are characterized for protection to a 15 kv limit using the human body model. human body model figure 33 shows the human body model and the current waveform it generates when discharged into a low impedance. this model consists of a 100 pf capacitor charged to the esd voltage of interest, which is then discharged into the test device through a 1.5 k resistor. 100% 90% 36.8% 10% t rl t dl i peak time t r2 c1 r1 high voltage generator device under test esd test method human body model esd assoc. std 55.1 r2 1.5k ? c1 100pf 0 6285-015 figure 33. human body model and current waveform 256 transceivers on the bus the standard rs-485 receiver input impedance is 12 k (1 unit load), and the standard driver can drive up to 32 unit loads. the adm307xe family of transceivers has an ? unit load receiver input impedance (96 k), allowing up to 256 transceivers to be connected in parallel on one communica- tion line. any combination of these devices and other rs-485 transceivers with a total of 32 unit loads or fewer can be connected to the line. reduced emi and reflections the adm3070e/adm3071e/adm3072e feature reduced slew rate drivers that minimize emi and reduce reflections caused by improperly terminated cables, allowing for error-free data transmission at rates up to 250 kbps. the adm3073e/ adm3074e/adm3075e offer higher driver output slew rate limits, allowing for transmit speeds of up to 500 kbps.
adm3070e/adm3071e /adm3072e/adm3073e/adm3 074e/adm3075e/adm3076e/adm3077e/adm3078e rev. a | page 17 of 20 low power shutdown mode (all except adm3071e/adm3074e/adm3077e) low power shutdown mode is initiated by bringing both re high and de low. in shutdown mode, the device draws less than 1 a of supply current. re and de can be driven simulta- neously, but the parts are guaranteed not to enter shutdown if re is high and de is low for fewer than 50 ns. if the inputs are in this state for 600 ns or more, the parts are guaranteed to enter shutdown. enable times t zh and t zl assume the part was not originally in a low power shutdown state (see the te st c irc uits and switching characteristics section). enable times t zh(shdn) and t zl(shdn) assume the part was originally shut down. it takes drivers and receivers longer to become enabled from low power shutdown mode (t zh(shdn) , t zl(shdn) ) than from driver/receiver disable mode (t zh , t zl ). driver output protection the adm307xe family features two methods to prevent excessive output current and power dissipation caused by faults or by bus contention. current limit protection on the output stage provides immediate protection against short circuits over the whole common-mode voltage range (see figure 12 and figure 13 ). in addition, a thermal shutdown circuit forces the driver outputs into a high impedance state if the die temper- ature rises excessively. typical applications the adm3072e/adm3075e/adm3078e transceivers are designed for bidirectional data communications on multipoint bus transmission lines. figure 34 shows a typical network applications circuit. the adm3071e/adm3074e/adm3077e transceivers are designed for po int-to-point transmission lines (see figure 35 ). the adm3070e/adm3073e/adm3076e transceivers are designed for full-duplex rs-485 networks (see figure 36 ). to minimize reflections, terminate the line at both ends with a termination resistor (the value of the termination resistor should be equal to the characteristic impedance of the cable used) and keep stub lengths off the main line as short as possible. b a r d ro di de adm3072e/ adm3075e/ adm3078e adm3072e/ adm3075e/ adm3078e adm3072e/ adm3075e/ adm3078e adm3072e/ adm3075e/ adm3078e b a r d ro di de b a r d ro re di de b a r d ro re di de r t r t 06285-016 notes 1. maximum number of nodes: 256. 2. r t is equal to the characteristic impedance of the cable used. re re figure 34. adm3072e/adm3075e/adm3078e typical half-duplex rs-485 network b a r d ro di ro di y z b a y z master r d slave adm3071e/ adm3074e/ adm3077e adm3071e/ adm3074e/ adm3077e 06285-017 figure 35. adm3071e/adm3074e/adm3077e full-duplex point-to-point applications
adm3070e/adm3071e /adm3072e/adm3073e/ad m3074e/adm3075e /adm3076e/adm3077e/adm3078e rev. a | page 18 of 20 r d ro di de adm3070e/ adm3073e/ adm3076e adm3070e/ adm3073e/ adm3076e adm3070e/ adm3073e/ adm3076e adm3070e/ adm3073e/ adm3076e notes 1. maximum number of nodes: 32. 2 . r t is equal to the characteristic impedance of the cable used. a b y z ro r t r t r d ro di de slave ab y z r di de b a z y d r d ro di de slave sl a v e master ab y z 06285-019 re re re re figure 36. adm3070e/adm3073e/adm3076e full-duplex rs-485 network r d ro di data in data out de adm3070e/ adm3073e/ adm3076e notes 1. r t is equal to the characteristic impedance of the cable used. a b y z r t r t 06285-018 re figure 37. line repeater for adm3070e/adm3073e/adm3076e
adm3070e/adm3071e /adm3072e/adm3073e/adm3 074e/adm3075e/adm3076e/adm3077e/adm3078e rev. a | page 19 of 20 outline dimensions controlling dimensions are in millimeters; inch dimensions (in parentheses) are rounded-off millimeter equivalents for reference only and are not appropriate for use in design. compliant to jedec standards ms-012-a a 060506-a 0.25 (0.0098) 0.17 (0.0067) 1.27 (0.0500) 0.40 (0.0157) 0.50 (0.0196) 0.25 (0.0099) 45 8 0 1.75 (0.0688) 1.35 (0.0532) seating plane 0.25 (0.0098) 0.10 (0.0040) 4 1 85 5.00 (0.1968) 4.80 (0.1890) 4.00 (0.1574) 3.80 (0.1497) 1.27 (0.0500) bsc 6.20 (0.2440) 5.80 (0.2284) 0.51 (0.0201) 0.31 (0.0122) coplanarity 0.10 figure 38. 8-lead standard small outline package [soic_n] narrow body (r-8) dimensions shown in millimeters and (inches) controlling dimensions are in millimeters; inch dimensions (in parentheses) are rounded-off millimeter equivalents for reference only and are not appropriate for use in design. compliant to jedec standards ms-012-ab 060606-a 14 8 7 1 6.20 (0.2441) 5.80 (0.2283) 4.00 (0.1575) 3.80 (0.1496) 8.75 (0.3445) 8.55 (0.3366) 1.27 (0.0500) bsc seating plane 0.25 (0.0098) 0.10 (0.0039) 0.51 (0.0201) 0.31 (0.0122) 1.75 (0.0689) 1.35 (0.0531) 0.50 (0.0197) 0.25 (0.0098) 1.27 (0.0500) 0.40 (0.0157) 0.25 (0.0098) 0.17 (0.0067) coplanarity 0.10 8 0 45 figure 39. 14-lead standard small outline package [soic_n] narrow body (r-14) dimensions shown in millimeters and (inches)
adm3070e/adm3071e /adm3072e/adm3073e/ad m3074e/adm3075e /adm3076e/adm3077e/adm3078e rev. a | page 20 of 20 ?2006 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owners. d06285-0-10/06(a) ordering guide model temperature range package description package option ordering quantity adm3070earz 1 C40c to +85c 14-lead standard small outline package (soic_n) r-14 adm3070earz-reel7 1 C40c to +85c 14-lead standard small outline package (soic_n) r-14 1,000 adm3070eyrz 1 C40c to +125c 14-lead standard small outline package (soic_n) r-14 adm3070eyrz-reel7 1 C40c to +125c 14-lead standard small outline package (soic_n) r-14 1,000 adm3071earz 1 C40c to +85c 8-lead standard small outline package (soic_n) r-8 adm3071earz-reel7 1 C40c to +85c 8-lead standard small outline package (soic_n) r-8 1,000 adm3071eyrz 1 C40c to +125c 8-lead standard small outline package (soic_n) r-8 adm3071eyrz-reel7 1 C40c to +125c 8-lead standard small outline package (soic_n) r-8 1,000 adm3072earz 1 C40c to +85c 8-lead standard small outline package (soic_n) r-8 adm3072earz-reel7 1 C40c to +85c 8-lead standard small outline package (soic_n) r-8 1,000 adm3072eyrz 1 C40c to +125c 8-lead standard small outline package (soic_n) r-8 adm3072eyrz-reel7 1 C40c to +125c 8-lead standard small outline package (soic_n) r-8 1,000 adm3073earz 1 C40c to +85c 14-lead standard small outline package (soic_n) r-14 adm3073earz-reel7 1 C40c to +85c 14-lead standard small outline package (soic_n) r-14 1,000 adm3073eyrz 1 C40c to +125c 14-lead standard small outline package (soic_n) r-14 adm3073eyrz-reel7 1 C40c to +125c 14-lead standard small outline package (soic_n) r-14 1,000 adm3074earz 1 C40c to +85c 8-lead standard small outline package (soic_n) r-8 adm3074earz-reel7 1 C40c to +85c 8-lead standard small outline package (soic_n) r-8 1,000 adm3074eyrz 1 C40c to +125c 8-lead standard small outline package (soic_n) r-8 adm3074eyrz-reel7 1 C40c to +125c 8-lead standard small outline package (soic_n) r-8 1,000 adm3075earz 1 C40c to +85c 8-lead standard small outline package (soic_n) r-8 adm3075earz-reel7 1 C40c to +85c 8-lead standard small outline package (soic_n) r-8 1,000 adm3075eyrz 1 C40c to +125c 8-lead standard small outline package (soic_n) r-8 ADM3075EYRZ-REEL7 1 C40c to +125c 8-lead standard small outline package (soic_n) r-8 1,000 adm3076earz 1 C40c to +85c 14-lead standard small outline package (soic_n) r-14 adm3076earz-reel7 1 C40c to +85c 14-lead standard small outline package (soic_n) r-14 1,000 adm3076eyrz 1 C40c to +125c 14-lead standard small outline package (soic_n) r-14 adm3076eyrz-reel7 1 C40c to +125c 14-lead standard small outline package (soic_n) r-14 1,000 adm3077earz 1 C40c to +85c 8-lead standard small outline package (soic_n) r-8 adm3077earz-reel7 1 C40c to +85c 8-lead standard small outline package (soic_n) r-8 1,000 adm3077eyrz 1 C40c to +125c 8-lead standard small outline package (soic_n) r-8 adm3077eyrz-reel7 1 C40c to +125c 8-lead standard small outline package (soic_n) r-8 1,000 adm3078earz 1 C40c to +85c 8-lead standard small outline package (soic_n) r-8 adm3078earz-reel7 1 C40c to +85c 8-lead standard small outline package (soic_n) r-8 1,000 adm3078eyrz 1 C40c to +125c 8-lead standard small outline package (soic_n) r-8 adm3078eyrz-reel7 1 C40c to +125c 8-lead standard small outline package (soic_n) r-8 1,000 1 z = pb-free part.

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