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5 v, 15 kv esd protected half-duplex, rs-485/rs-422 transceivers adm485e/adm487e/adm1487e rev. 0 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 ?2007 analog devices, inc. all rights reserved. features tia/eia rs-485-/rs-422-compliant esd protection on rs-485 i/o pins 15 kv human body model data rates adm487e: 250 kbps adm485e/adm1487e: 2.5 mbps half-duplex options reduced slew rates for low emi ?7 v to +12 v common-mode input range thermal shutdown and short-circuit protection 8-lead soic packages applications energy/power metering lighting systems industrial control telecommunications security systems instrumentation functional block diagram b a r d ro re de di gnd v cc adm485e/ adm487e/ adm1487e 06356-001 figure 1. general description the adm485e/adm487e/adm1487e are 5 v, low power data transceivers with 15 kv esd protection suitable for half- duplex communication on multipoint bus transmission lines. they are designed for balanced data transmission and comply with telecommunication industry association/electronics indus- tries association (tia/eia) standards rs-485 and rs-422. the adm487e and adm1487e have a 1/4 unit load receiver input impedance that allows up to 128 transceivers on a bus, whereas the adm485e allows up to 32 transceivers on a bus. because only one driver is enabled at any time, the output of a disabled or power-down driver is three-stated to avoid overloading the bus. the driver outputs are slew rate-limited to reduce emi and data errors caused by reflections from improperly terminated buses. excessive power dissipation caused by bus contention or output shorting is prevented with a thermal shutdown circuit. the parts are fully specified over the industrial temperature ranges and are available in 8-lead soic packages. table 1. selection table part number half-/full- duplex guaranteed data rate (mbps) slew rate limited low power shutdown driver/receiver enable quiescent current (a) number of nodes on bus pin count adm485e half 2.5 no no yes 300 32 8 adm487e half 0.25 yes yes yes 120 128 8 adm1487e half 2.5 no no yes 230 128 8
adm485e/adm487e/adm1487e rev. 0 | page 2 of 16 table of contents features .............................................................................................. 1 applications....................................................................................... 1 functional block diagram .............................................................. 1 general description ......................................................................... 1 revision history ............................................................................... 2 specifications..................................................................................... 3 timing specifications .................................................................. 4 absolute maximum ratings............................................................ 6 esd caution.................................................................................. 6 pin configuration and function descriptions............................. 7 typical performance characteristics ..............................................8 test circuits and switching characteristics................................ 11 theory of operation ...................................................................... 13 circuit description .................................................................... 13 applications information .............................................................. 15 differential data transmission ................................................ 15 cable and data rate................................................................... 15 outline dimensions ....................................................................... 16 ordering guide .......................................................................... 16 revision history 1/07revision 0: initial version
adm485e/adm487e/adm1487e rev. 0 | page 3 of 16 specifications v cc = 5 v 5%, t a = t min to t max , unless otherwise noted. table 2. adm485e/adm487e/adm1487e parameter symbol min typ max unit test conditions/comments driver differential outputs differential output voltage (no load) v od1 5 v v od2 2 v r l = 50 (rs-422) differential output voltage (with load) 1.5 5 v r l = 27 (rs-485) (see figure 18) |v od | for complementary output states 0.2 v r l = 27 or 50 (see figure 18) common-mode output voltage v oc 3 v r l = 27 or 50 (see figure 18) |v oc | for complementary output states 0.2 v r l = 27 or 50 (see figure 18) logic inputs input high voltage v ih 2.0 v de, di, re input low voltage v il 0.8 v de, di, re logic input current i in1 2 a de, di, re receiver i in2 1.0 ma de = 0 v, v in = 12 v ?0.8 ma v cc = 0 v or +5.25 v, v in = ?7 v (adm485e) 0.25 ma de = 0 v, v in = 12 v input current (a, b) ?0.2 ma v cc = 0 v or +5.25 v, v in = ?7 v (adm487e/adm1487e) differential inputs differential input threshold voltage v th ?0.2 +0.2 v ?7 v < v cm < +12 v input hysteresis v th 70 mv v cm = 0 v receiver output logic output voltage high v oh 3.5 v i out = ?4 ma, v id = +200 mv output voltage low v ol 0.4 v i out = +4 ma, v id = ?200 mv three-state output leakage current i ozr 1 a 0.4 v < v o < 2.4 v r in 12 k ?7 v < v cm < +12 v (adm485e) receiver input resistance 48 k ?7 v< v cm < +12 v (adm487e/adm1487e) power supply i cc 500 900 a re = 0 v or v cc , de = v cc (adm485e) 300 500 a re = 0 v or v cc , de = 0 v (adm485e) 300 500 a re = 0 v or v cc , de = v cc (adm1487e) 230 400 a re = 0 v or v cc , de = 0 v (adm1487e) 250 400 a re = 0 v or v cc , de = v cc (adm487e) no load supply current 120 250 a re = 0 v, de = 0 v (adm487e) supply current in shutdown i shdn 0.5 10 a de = 0 v, re = v cc (adm487e) driver short-circuit current, v o high i osd1 35 250 ma ?7 v v o +12 v, applies to peak current driver short-circuit current, v o low i osd2 35 250 ?7 v v o +12 v, applies to peak current receiver short-circuit current i osr 7 95 ma 0 v v o v cc esd protection a, b pins 15 kv human body model
adm485e/adm487e/adm1487e rev. 0 | page 4 of 16 timing specifications v cc = 5 v 5%, t a = t min to t max , unless otherwise noted. table 3. adm485e/adm1487e parameter symbol min typ max unit test conditions/comments driver input to output t dplh 10 40 60 ns r diff = 54 , cl1 = cl2 = 100 pf (see figure 19 and figure 20) t dphl 10 40 60 ns r diff = 54 , cl1 = cl2 = 100 pf (see figure 19 and figure 20) output skew to output t skew 5 10 ns r diff = 54 , cl1 = cl2 = 100 pf (see figure 19 and figure 20) rise/fall time t dr , t df 3 20 40 ns r diff = 54 , cl1 = cl2 = 100 pf (see figure 19 and figure 20) enable time to high level t dzh 45 70 ns c rl = 100 pf, s2 closed (see figure 21) enable time to low level t dzl 45 70 ns c rl = 100 pf, s1 closed (see figure 22) disable time from low level t dlz 45 70 ns c rl = 15 pf, s1 closed (see figure 22) disable time from high level t dhz 45 70 ns c rl = 15 pf, s2 closed (see figure 21) receiver input to output t rplh 20 60 200 ns r diff = 54 , cl1 = cl2 = 100 pf (see figure 23 and figure 24) |t plh ? t phl | differential receiver skew t skew 5 ns r diff = 54 , cl1 = cl2 = 100 pf (see figure 4 and figure 5) enable time to low level t rzl 25 50 ns c rl = 15 pf, s2 closed (see figure 25) enable time to high level t rzl 20 50 ns c rl = 15 pf, s1 closed (see figure 25) disable time from low level t rlz 20 50 ns c rl = 15 pf, s2 closed (see figure 25) disable time from high level t rhz 20 50 ns t plh , t phl < 50% of data period maximum data rate f max 2.5 mbps
adm485e/adm487e/adm1487e rev. 0 | page 5 of 16 v cc = 5 v 5%, t a = t min to t max , unless otherwise noted. table 4. adm487e parameter symbol min typ max unit test conditions/comments driver input to output t dplh 250 800 2000 ns r diff = 54 , cl1 = cl2 = 100 pf (see figure 19 and figure 20 ) t dphl 250 800 2000 ns r diff = 54 , cl1 = cl2 = 100 pf (see figure 19 and figure 20 ) output skew to output t skew 250 20 800 ns r diff = 54 , cl1 = cl2 = 100 pf (see figure 19 and figure 20 ) rise/fall time t dr , t df 250 2000 ns r diff = 54 , cl1 = cl2 = 100 pf (see figure 19 and figure 20 ) enable time to high level t dzh 250 2000 ns c rl = 100 pf, s2 closed (see figure 21 ) enable time to low level t dzl 2000 ns c rl = 100 pf, s1 closed (see figure 22 ) disable time from low level t dlz 300 3000 ns c rl = 15 pf, s1 closed (see figure 22 ) disable time from high level t dhz 300 3000 ns c rl = 15 pf, s2 closed (see figure 21 ) receiver input to output t rplh 250 2000 ns r diff = 54 , cl1 = cl2 = 100 pf t rphl 250 2000 ns r diff = 54 , cl1 = cl2 = 100 pf (see figure 19 and figure 20 ) |t plh ? t phl | differential receiver skew t skew 100 ns c rl = 15 pf, s1 closed (see figure 23 and figure 24 ) enable time to low level t rzl 25 50 ns c rl = 15 pf, s2 closed (see figure 25 ) enable time to high level t rzl 25 50 ns c rl = 15 pf, s1 closed (see figure 25 ) disable time from low level t rlz 25 50 ns c rl = 15 pf, s2 closed (see figure 25 ) disable time from high level t rhz 25 50 ns t plh , t phl < 50% of data period maximum data rate f max 250 kbps time to shutdown 1 t dzh(shdn) 50 200 600 ns c l = 100 pf, s2 closed (see figure 21 ) driver enable from shutdown to output high t dzl(shdn) 5000 ns c l = 100 pf, s1 closed (see figure 22 ) driver enable from shutdown to output low t rzl(shdn) 5000 ns c l = 15 pf, s2 closed (see figure 25 ) receiver enable from shutdown to output high t rzh(shdn) 5000 ns c l = 15 pf, s1 closed (see figure 25 ) 1 the adm487e is put into shut down mode by bringing the re high and the de low. if the inputs are in this stat e for less than 50 ns, the parts are guaranteed not to enter shutdown. if the inputs are in this state for at least 600 ns, the adm487e is guaranteed to enter shutdown.
adm485e/adm487e/adm1487e rev. 0 | page 6 of 16 absolute maximum ratings t a = 25c, unless otherwise noted. table 5. parameter rating v cc to gnd ?0.5 v to +6 v digital i/o voltage (de, re ) ?0.5 v to (v cc + 0.5 v) driver input voltage (di) ?0.5 v to (v cc + 0.5 v) receiver output voltage (ro) ?0.5 v to (v cc + 0.5 v) driver output/receiver input voltage (a, b) ?9 v to +14 v operating temperature range ?40 to +85c storage temperature range ?65 to +150c ja thermal impedance 158c/w soic-8 lead temperature soldering (10 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
adm485e/adm487e/adm1487e rev. 0 | page 7 of 16 pin configuration and fu nction descriptions adm485e/ adm487e/ adm1487e top view (not to scale) ro 1 re 2 de 3 di 4 v cc 8 b 7 a 6 gnd 5 06356-002 figure 2. pin configuration table 6. pin function descriptions pin no. mnemonic description 1 ro receiver output. when enabled, if a > b by 200 mv, then ro = high. if a < b by 200 mv, then ro = low. 2 re receiver output enable. a low level enables the ro; a high level places it in a high impedance state. 3 de driver output enable. a high level enab les the driver differential outputs, pi n a and pin b; a low level places it in a high impedance state. 4 di driver input. when the driver is enabled, a logic l = lo w on di forces a low and b high; a logic h = high on di forces pin a high and pin b low. 5 gnd ground connection (0 v). 6 a noninverting receiver input a/driver output a. 7 b inverting receiver input b/driver output b. 8 v cc power supply (5 v 5%).
adm485e/adm487e/adm1487e rev. 0 | page 8 of 16 typical performance characteristics 0 0.5 1.0 1.5 2.0 2.5 06356-016 output current (ma) output low voltage (v) 0 5 10 15 20 25 30 35 40 45 50 figure 3. output current vs. receiver output low voltage 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 06356-017 output current (ma) output high voltage (v) 0 ?5 ?10 ?15 ?20 ?25 ? 30 figure 4. output current vs. receiver output high voltage ?40 ?20 0 20 40 60 80 06356-018 output high voltage (v) temperature (c) 3.9 4.0 4.1 4.2 4.3 4.4 4.5 i ro = ?8ma figure 5. receiver output high voltage vs. temperature ?40 ?20 0 20 40 60 80 06356-019 output low voltage (v) temperature (c) 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 i ro = 8ma figure 6. receiver output low voltage vs. temperature 06356-020 output current (ma) differential output voltage (v) 0 5 10 15 20 25 30 35 40 45 0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 figure 7. driver output current vs. differential output voltage 06356-021 differential output voltage (v) temperature (c) 1.5 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 ?40 ?20 0 20 40 60 80 figure 8. driver differential output voltage vs. temperature
adm485e/adm487e/adm1487e rev. 0 | page 9 of 16 06356-022 output current (ma) output low voltage (v) 0 20 40 60 80 100 120 140 0246810 12 figure 9. output current vs. driver output low voltage 06356-023 output current (ma) output high voltage (v) 0 ?20 ?40 ?60 ?80 ?100 ?120 ? 140 ?8?6?4?20246 figure 10. output current vs. driver output high voltage 06356-024 supply current (a) temperature (c) 0 100 200 300 400 500 600 ?40 ?20 0 20 40 60 80 de = v cc and re = x de = 0 and re = x figure 11. adm485e/adm1487e supply current vs. temperature 06356-025 supply current (a) temperature (c) 0 100 200 300 400 500 600 ?40 ?20 0 20 40 60 80 de = v cc and re = x de = 0 and re = ? figure 12. adm487e supply current vs. temperature 06356-026 shutdown current (a) temperature (c) 0 1 2 3 4 5 7 8 9 10 6 ?60 ?20 ?40 0 204060 10 80 0 figure 13. shutdown current vs. temperature 06356-027 ch1 5.00v ch3 500mv ch2 500mv m200ns a ch1 2.80v 1 2 3 t 57.60% t a b r o figure 14. adm487e receiver t phl
adm485e/adm487e/adm1487e rev. 0 | page 10 of 16 06356-028 ch1 5.00v ch3 500mv ch2 500mv m200ns a ch1 2.80v 1 2 3 t 60.80% t a b r o figure 15. adm487e receiver t plh driven by external rs-485 device 06356-029 ch1 5.00v ch3 500mv ch2 500mv m20ns a ch1 2.70v 1 2 3 t 60.80% a b r o t figure 16. adm485e/adm1487e receiver t phl 06356-030 ch1 5.00v ch3 500mv ch2 500mv m20ns a ch1 2.70v 1 2 3 t 60.80% b a r o t figure 17. adm485e/adm1487e receiver t plh
adm485e/adm487e/adm1487e rev. 0 | page 11 of 16 test circuits and switching characteristics 0 6356-003 z y v od v oc r l r l figure 18. driver dc test load 06356-004 di de v dd a b r l c l c l v od figure 19. driver timing test circuit 5 v 1.5v 1/2v o 20% 80% 80% 20% di a b 0v 0v v o v o ?v o v diff t skew = t dplh ? t dphl v diff = v (a) ? v (b) t dr t dplh t dphl t df 1/2 v o 06356-005 figure 20. driver propagation delays generator 0 or 5v 50 ? r l = 500 ? out c l s1 1.5v 5v 0v v oh 0v 0.5v 2.3v out de t dhz t dzh, t dzh(shdn) 06356-006 d figure 21. driver enable and disable times (t dhz , t dzh , t dzh(shdn) ) generator 0v or 5v 50? d r l = 500 ? v cc out c l s1 v cc /2 5v 0v 0.5v 2.3v v ol out v cc de t dlz t dzl, t dzl(shdn) 06356-007 figure 22. driver enable and disable times (t dzl , t dlz , t dzl(shdn) ) ate b receiver output a r v id 0 6356-008 figure 23. receiver propagation delay test circuit the rise time and fall time of input a and input b < 4ns +1 v ?1v t rphl t rplh 1.5v b ro v oh v ol a 06356-009 figure 24. receiver propagation delays
adm485e/adm487e/adm1487e rev. 0 | page 12 of 16 06356-010 generator +1.5v ?1.5v 0v or 5v re ro 50 ? s1 s2 t rzh, t rzh(shdn) t rhz +5v 0v 0v v oh +1.5v +1.5v +0.5v s1 open s2 closed s3 = +1.5v re ro t rzl, t rzl(shdn) +5v 0v v cc v ol +1.5v +1.5v re ro +5v 0v 0v v oh s1 open s2 closed s3 = +1.5v s1 closed s2 open s3 = ?1.5v t rlz +1.5v +0.5v re ro +5v 0v v cc v ol s1 closed s2 open s3 = +1.5v s3 v id 1k ? c l 15pf v cc figure 25. receiver enable and disable times
adm485e/adm487e/adm1487e rev. 0 | page 13 of 16 theory of operation the adm485e/adm487e/adm1487e are ruggedized rs-485 transceivers that operate from a single 5 v supply. they contain protection against high levels of electrostatic discharge and are ideally suited for operation in electrically harsh environments or where cables can be plugged or unplugged. these devices are intended for balanced data transmission and comply with tia/ eia standards rs-485 and rs-422. they contain a differential line driver and a differential line receiver and are suitable for half-duplex data transmission, as the driver and receiver share the same differential pins. the input impedance on the adm485e is 12 k, allowing up to 32 transceivers on the differential bus. the adm487e/ adm1487e are 48 k, allowing up to 128 transceivers on the differential bus. circuit description the adm485e/adm487e/adm1487e are operated from a single 5 v 10% power supply. excessive power dissipation caused by bus contention or output shorting is prevented by a thermal shutdown circuit. if, during fault conditions, a sig- nificant temperature increase is detected in the internal driver circuitry, this feature forces the driver output into a high impedance state. the receiver contains a fail-safe feature that results in a logic high output state if the inputs are unconnected (floating). a high level of robustness is achieved using internal protection circuitry, eliminating the need for external protection compo- nents such as tranzorbs or surge suppressors. low electromagnetic emissions are achieved using slew-rate- limited drivers, minimizing both conducted and radiated interference. the adm485e/adm487e/adm1487e can transmit at data rates up to 250 kbps. a typical application for the adm485e/adm487e/adm1487e is illustrated in figure 26 , which shows a half-duplex link where data can be transferred at rates up to 250 kbps. a terminating resistor is shown at both ends of the link. this termination is not critical, because the slew rate is controlled by the adm485e/ adm487e/adm1487e and reflections are minimized. the communications network can be extended to include multipoint connections, as shown in figure 29 . as many as 32 adm485e transceivers or 128 adm487e/adm1487e transceivers can be connected to the bus. adm485e/ adm487e/ adm1487e adm485e/ adm487e/ adm1487e rs485/rs-422 link ro di de di de b a gnd b a gnd ro 0.1f 0.1f 5 v 5 v v cc v cc re re 06356-012 figure 26. typical half-duplex link application table 7 and table 8 show the truth tables for transmitting and receiving. table 7. transmitting truth table transmitting inputs transmitting outputs re de di b a x 1 1 1 0 1 x 1 1 0 1 0 0 0 x 1 high-z high-z 1 0 x 1 high-z high-z 1 x = dont care. table 8. receiving truth table receiving inputs receiving outputs re de a to b ro 0 0 +0.2 v 1 0 0 ?0.2 v 0 0 0 inputs open circuit 1 1 0 x 1 high-z 1 x = dont care. esd transient protection scheme the adm485e/adm487e/adm1487e use protective clamping structures on their inputs and outputs that clamp the voltage to a safe level and dissipate the energy present in esd (electrostatic). the protection structure achieves esd protection up to 15 kv human body model (hbm).
adm485e/adm487e/adm1487e rev. 0 | page 14 of 16 esd testing 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 unit under test. with air discharge, the discharge gun is moved toward the unit under test, developing an arc across the air gap; hence the term air discharge. this method is influenced by humidity, temperature, barometric pressure, distance, and rate of closure of the discharge gun. the contact-discharge method, though less realistic, is more repeatable and is gaining accep- tance 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, which can result in degraded performance. the cumulative effects of continuous exposure can eventually lead to complete failure. c1 r2 high voltage generator device under test 06356-013 esd test method human body model r2 15kv c1 100pf figure 27. esd generator i/o lines are particularly vulnerable to esd damage. simply touching or plugging in an i/o cable can result in a static discharge that can damage or completely destroy the inter face product connected to the i/o port. it is, therefore, extremely important to have high levels of esd protection on the i/o lines. the esd discharge can induce latch-up in the device under test. therefore, it is important that esd testing on the i/o pins be carried out while device power is applied. this type of testing is more representative of a real-world i/o discharge where the equipment is operating normally when the discharge occurs. 100% 90% 36.8% 10% time ( t ) i peak t rl t dl 06356-014 figure 28. human body model esd current waveform table 9. adm483e esd test results esd test metho i/ pins ther pins human body model (hbm) 15 kv 3.5 v
adm485e/adm487e/adm1487e rev. 0 | page 15 of 16 applications information differential data transmission differential data transmission is used to reliably transmit data at high rates over long distances and through noisy environ- ments. differential transmission nullifies the effects of ground shifts and noise signals that appear as common-mode voltages on the line. there are two main standards approved by tia/eia that specify the electrical characteristics of transceivers used in differential data transmission. the rs-422 standard specifies data rates up to 10 mb and line lengths up to 4000 feet. a single driver can drive a transmission line with up to 10 receivers. to cater to true multipoint communications, the rs-485 standard is defined. this standard meets or exceeds all the requirements of rs-422, but also allows for up to 32 drivers and 32 receivers to be connected to a single bus. an extended common-mode range of ?7 v to +12 v is defined. the most significant differ- ence between rs-422 and rs-485 is that the drivers can be disabled, thereby allowing as many as 32 drivers to be connected to a single line. only one driver is enabled at a time, but the rs-485 standard contains additional specifications to guarantee device safety in the event of line contention. cable and data rate the transmission line of choice for rs-485 communications is a twisted pair. a twisted pair cable can cancel common-mode noise and can also cause cancellation of the magnetic fields generated by the current flowing through each wire, thereby reducing the effective inductance of the pair. a typical application showing a multipoint transmission net- work is illustrated in figure 29 . an rs-485 transmission line can have as many as 32 transceivers on the bus. only one driver can transmit at a particular time, but multiple receivers can be enabled simultaneously. d r d rr r d d 06356-015 rt rt figure 29. typical rs-485 network
adm485e/adm487e/adm1487e rev. 0 | page 16 of 16 ?2007 analog devices, inc. all rights reserved. trademarks and registered trademarks are the property of their respective owners. d06356-0-1/07(0) 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 30. 8-lead standard small outline package [soic_n] narrow body (r-8) dimensions shown in millimeters and (inches) ordering guide model temperature range package description package option adm485earz 1 C40c to +85c 8-lead standard small outline package (soic_n) r-8 ADM485EARZ-REEL7 1 C40c to +85c 8-lead standard small outline package (soic_n) r-8 adm487earz 1 C40c to +85c 8-lead standard small outline package (soic_n) r-8 adm487earz-reel7 1 C40c to +85c 8-lead standard small outline package (soic_n) r-8 adm1487earz 1 C40c to +85c 8-lead standard small outline package (soic_n) r-8 adm1487earz-reel7 1 C40c to +85c 8-lead standard small outline package (soic_n) r-8 1 z = pb-free part.

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