16 Mbps, ESD Protected, Full-Duplex RS-485 Transceivers Data Sheet ADM1490E/ADM1491E FEATURES FUNCTIONAL BLOCK DIAGRAMS RS-485/RS-422 full-duplex transceiver for high speed VCC motor control applications ADM1490E 16 Mbps data rate ±8 kV ESD protection on RS-485 input/output pins A Complies with ANSI/TIA/EIA-485-A-1998 RO R B Open circuit fail-safe Suitable for 5 V power supply applications Z 32 nodes on the bus (1 unit load) DI D Y Thermal shutdown protection AODpeMr1a4ti9n0gE t epmacpkeargaetus re range: −40°C to +85°C GND 07430-001 Narrow body, 8-lead SOIC Figure 1. 8-lead MSOP ADM1491E packages VCC Narrow-body, 14-lead SOIC ADM1491E 10-lead MSOP A APPLICATIONS RO R B RS-485/RS-422 interfaces RE Industrial field networks DE High data rate motor control Z Multipoint data transmission systems DI D Single-ended-to-differential signal conversion GND Y07430-002 Figure 2. GENERAL DESCRIPTION The ADM1490E/ADM1491E are RS-485/RS-422 transceivers maximum output current to ±250 mA during fault conditions. with ±8 kV ESD protection and are suitable for high speed, full- A thermal shutdown circuit senses if the die temperature rises duplex communication on multipoint transmission lines. In above 150°C and forces the driver outputs into a high impedance particular, the ADM1490E/ADM1491E are designed for use in state under this condition. motor control applications requiring communications at data The receiver of the ADM1490E/ADM1491E contains a fail-safe rates up to 16 Mbps. feature that results in a logic high output state if the inputs are The ADM1490E/ADM1491E are designed for balanced trans- unconnected (floating). mission lines and comply with TIA/EIA-485-A-98. The devices The ADM1490E/ADM1491E feature extremely fast and closely each have a 12 kΩ receiver input impedance for unit load RS-485 matched switching times. Minimal driver propagation delays operation, allowing up to 32 nodes on the bus. permit transmission at data rates up to 16 Mbps, and low skew The differential transmitter outputs and receiver inputs feature minimizes EMI interference. electrostatic discharge circuitry that provides protection to ±8 kV The ADM1490E/ADM1491E are fully specified over the using the human body model (HBM). commercial and industrial temperature ranges. The ADM1490E The ADM1490E/ADM1491E operate from a single 5 V power is available in two packages: a narrow body, 8-lead SOIC and an supply. Excessive power dissipation caused by bus contention 8-lead MSOP. The ADM1491E is also available in two packages: or output shorting is prevented by short-circuit protection and a narrow body, 14-lead SOIC and a 10-lead MSOP. thermal circuitry. Short-circuit protection circuits limit the Rev. D 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. 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. Tel: 781.329.4700 www.analog.com Trademarks and registered trademarks are the property of their respective owners. Fax: 781.461.3113 ©2008–2012 Analog Devices, Inc. All rights reserved.

ADM1490E/ADM1491E Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Typical Performance Characteristics ..............................................7 Applications ....................................................................................... 1 Test Circuits ........................................................................................9 Functional Block Diagrams ............................................................. 1 Theory of Operation ...................................................................... 10 General Description ......................................................................... 1 Truth Tables................................................................................. 10 Revision History ............................................................................... 2 ESD Transient Protection Scheme ........................................... 10 Specifications ..................................................................................... 3 Applications Information .............................................................. 12 Timing Specifications .................................................................. 4 Differential Data ......................................................................... 12 Absolute Maximum Ratings ............................................................ 5 Cable and Data Rate ................................................................... 12 Thermal Resistance ...................................................................... 5 Typical Applications ................................................................... 12 ESD Caution .................................................................................. 5 Outline Dimensions ....................................................................... 14 Pin Configurations and Function Descriptions ........................... 6 Ordering Guide .......................................................................... 15 REVISION HISTORY 2/12—Rev. C to Rev. D Changes to Figure 8 .......................................................................... 6 Updated Outline Dimensions ....................................................... 14 12/10—Rev. B to Rev. C Changes to Figure 29 ...................................................................... 12 Changes to Figure 30 ...................................................................... 13 7/09—Rev. A to Rev. B Added ADM1490E, 8-Lead SOIC, and 8-Lead MSOP .... Universal Changes to Table 4 ............................................................................ 5 Added Figure 7; Renumbered Figures Sequentially ..................... 6 Changes to Table 5 ............................................................................ 6 Changes to Typical Applications Section .................................... 12 Added Figure 29 .............................................................................. 12 Changes to Figure 30 ...................................................................... 13 Updated Outline Dimensions ....................................................... 14 Changes to Ordering Guide .......................................................... 15 2/09—Rev. 0 to Rev. A Change to Table 9 ........................................................................... 11 12/08—Revision 0: Initial Version Rev. D | Page 2 of 16

Data Sheet ADM1490E/ADM1491E SPECIFICATIONS 4.75 V ≤ V ≤ 5.25 V; all minimum/maximum specifications apply over the entire recommended operation range, unless otherwise CC noted. All typical specifications are at T = 25°C, V = 5.0 V, unless otherwise noted. A CC Table 1. Parameter Symbol Min Typ Max Unit Test Conditions/Comments SUPPLY CURRENT Outputs Enabled I 1.2 2.0 mA Outputs unloaded, digital inputs = V or GND CC1 CC Outputs Disabled I 0.8 1.5 mA Outputs unloaded, digital inputs = V or GND CC2 CC DRIVER Differential Outputs Differential Output Voltage, Loaded |V | 2.0 5.0 V R = 100 Ω (RS-422), see Figure 21 OD2 L 1.5 5.0 V R = 54 Ω (RS-485), see Figure 21 L |V | 1.5 5.0 V −7 V ≤ V ≤ +12 V, see Figure 22 OD3 TEST ∆|V | for Complementary Output States ∆|V | 0.2 V R = 54 Ω or 100 Ω, see Figure 21 OD OD2 L Common-Mode Output Voltage V 3.0 V R = 54 Ω or 100 Ω, see Figure 21 OC L ∆|V | for Complementary Output States ∆|V | 0.2 V R = 54 Ω or 100 Ω, see Figure 21 OC OC L Output Leakage Current (Y, Z) I 100 µA DE = 0 V, V = 0 V or 5 V, V = 12 V O DD IN I −100 µA DE = 0 V, V = 0 V or 5 V, V = −7 V O DD IN Output Short-Circuit Current I 250 mA −7 V < V < +12 V OS OUT Logic Inputs DE, RE, DI Input Low Voltage VIL 0.8 V DE, RE, DI Input High Voltage VIH 2.0 V DE, RE, DI Input Current II −1 +1 µA DE, RE, DI RECEIVER Differential Inputs Differential Input Threshold Voltage V −0.2 +0.2 V −7 V < V < +12 V TH CM Input Voltage Hysteresis V 30 mV V = 0 V HYS CM Input Current (A, B) I 1.0 mA V = 12 V I CM −0.8 mA V = −7 V CM Line Input Resistance R 12 30 kΩ −7 V ≤ V ≤ +12 V IN CM Logic Outputs Output Voltage Low V 0.4 V I = +4.0 mA, V − V = −0.2 V OL OUT A B Output Voltage High V 4.0 V I = −4.0 mA, V − V = +0.2 V OH OUT A B Short-Circuit Current 85 mA Three-State Output Leakage Current I ±1 µA V = 5.25 V, 0.4 V < V < 2.4 V OZR CC OUT Rev. D | Page 3 of 16

ADM1490E/ADM1491E Data Sheet TIMING SPECIFICATIONS T = −40°C to +85°C. A Table 2. Parameter Symbol Min Typ Max Unit Test Conditions/Comments DRIVER Maximum Data Rate 16 Mbps Propagation Delay t , t 11 17 ns R = 54 Ω, C = 100 pF, see Figure 23 and Figure 3 DPLH DPHL L L Driver Output Skew t 0.5 2 ns R = 54 Ω, C = 100 pF, see Figure 23 and Figure 3, SKEW L L t = |t − t | SKEW DPLH DPHL Rise Time/Fall Time t , t 8 15 ns R = 54 Ω, C = 100 pF, see Figure 23 and Figure 3 DR DF L L Enable Time t , t 20 ns R = 110 Ω, C = 50 pF, see Figure 24 and Figure 5 ZH ZL L L Disable Time t , t 20 ns R = 110 Ω, C = 50 pF, see Figure 24 and Figure 5 HZ LZ L L RECEIVER Propagation Delay t , t 12 20 ns C = 15 pF, see Figure 25 and Figure 4 PLH PHL L Skew |t − t | t 0.4 2 ns C = 15 pF, see Figure 25 and Figure 4 PLH PHL SKEW L Enable Time t , t 13 ns R = 1 kΩ, C = 15 pF, see Figure 26 and Figure 6 ZH ZL L L Disable Time t , t 13 ns R = 1 kΩ, C = 15 pF, see Figure 26 and Figure 6 HZ LZ L L Timing Diagrams Switching Characteristics VCC VCC VCC/2 VCC/2 DE 0.5VCC 0.5VCC 0V 0V tDPLH tDPHL tZL 2.3V tLZ Z VO 1/2VO Y, Z VOL + 0.5V VOL Y tZH 2.3V tHZ VOH Y, Z VOH – 0.5V V+DVIFOF 90% POINT VDIFF = V(Y) – V(Z) 90% POINT 0V 07430-011 –VO 10% POINT tDR tDF 10% POINT 07430-009 Figure 3. Driver Propagation Delay Rise/Fall Timing Figure 5. Driver Enable/Disable Timing 0.7VCC A – B 0V 0V RE 0.5VCC 0.5VCC 0.3VCC tZL tLZ tPLH tPHL VOH 1.5V RO OUTPUT LOW VOL+ 0.5V RO 1.5V tSKEW=|tPLH –tPHL| 1.5V VOL 07430-010 R0OV tZH 1.5V OUTPUT HIGH tHZ VOH–0.5V VVOOHL07430-012 Figure 4. Receiver Propagation Delay Timing Figure 6. Receiver Enable/Disable Timing Rev. D | Page 4 of 16

Data Sheet ADM1490E/ADM1491E ABSOLUTE MAXIMUM RATINGS T = 25°C, unless otherwise noted. THERMAL RESISTANCE A θ is specified for the worst-case conditions, that is, a device Table 3. JA soldered in a circuit board for surface-mount packages. Parameter Rating V to GND −0.3 V to +7 V CC Table 4. Thermal Resistance Digital I/O Voltage (DE, RE) −0.3 V to VCC + 0.3 V Package Type θ Unit JA Driver Input Voltage (DI) −0.3 V to V + 0.3 V CC 8-Lead SOIC 121 °C/W Receiver Output Voltage (RO) −0.3 V to V + 0.3 V CC 14-Lead SOIC 86 °C/W Driver Output/Receiver Input Voltage −9 V to +14 V 8-Lead MSOP 133 °C/W (A, B, Y, Z) 10-Lead MSOP 133 °C/W Operating Temperature Range −40°C to +85°C Storage Temperature Range −55°C to +150°C ESD (HBM) on A, B, Y, and Z ±8 kV ESD CAUTION 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. Rev. D | Page 5 of 16

ADM1490E/ADM1491E Data Sheet PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS NC 1 14 VCC RO 2 13 VCC RE 3 ADM1491E 12 A DE 4 TOP VIEW 11 B (Not to Scale) DI 5 10 Z GND 6 9 Y GND 7 8 NC NOTES 1.NC = NO CONNECT. DO NOT CONNECT TO THIS PIN. RO 1 10 VCC VCC 1 8 A 2.PIN 7 IS NOT CONNECTED INTERNALLY. RE 2 ADM1491E 9 A RO 2 ADM1490E 7 B SINHDOUWSTNR AYS S GTNADN DTAOR CDO PMINPOLYU TW.ITH DE 3 TOP VIEW 8 B GNDDI 34 (NToOt Pto V SIEcaWle) 65 ZY 07430-034 3.PSINIHNDO U1WS4 TNISR A YNS OS VTTCA CCN OTDNOAN RCEDOC MPTIEPNDLOY IUN WTT.IETRHNALLY. 07430-013 GNDDI 45 (Not to Scale) 76 ZY 07430-015 Figure 7. 8-Lead MSOP and 8-Lead SOIC Figure 8. 14-Lead, Narrow Body SOIC Figure 9. 10-Lead MSOP Pin Configuration Pin Configuration Pin Configuration Table 5. Pin Function Descriptions Pin No. 8-Lead SOIC, 8-Lead MSOP 14-Lead SOIC 10-Lead MSOP Mnemonic Description N/A1 1 N/A1 NC No Connect. This pin is available on the 14-lead SOIC only. 2 2 1 RO Receiver Output. N/A1 3 2 RE Receiver Output Enable. A low level enables the receiver output, whereas a high level places the receiver output in a high impedance state. N/A1 4 3 DE Driver Output Enable. A logic high enables the differential driver outputs, A and B, whereas a logic low places the differential driver outputs in a high impedance state. 3 5 4 DI Driver Input. When the driver is enabled, a logic low on DI forces Pin A low and Pin B high, whereas a logic high on DI forces Pin A high and Pin B low. 4 6 5 GND Ground. N/A1 7 N/A1 GND Ground. This pin is available on the 14-lead SOIC only. N/A1 8 N/A1 NC No Connect. This pin is available on the 14-lead SOIC only. 5 9 6 Y Noninverting Driver Output Y. 6 10 7 Z Inverting Driver Output Z. 7 11 8 B Inverting Receiver Input B. 8 12 9 A Noninverting Receiver Input A. 1 13 10 V Power Supply (5 V ± 5%). CC N/A1 14 N/A1 V Power Supply (5 V ± 5%). This pin is available on the 14-lead SOIC only. CC 1 N/A indicates not applicable. Rev. D | Page 6 of 16

Data Sheet ADM1490E/ADM1491E TYPICAL PERFORMANCE CHARACTERISTICS 35 0.50 30 0.45 RRENT (mA) 2250 OLTAGE (V) 00..4305 OUTPUT CU 1105 OUTPUT V 00..2350 5 0.20 00 0.25 0.50 O0U.7T5PUT V1.O00LTAG1E.2 5(V) 1.50 1.75 2.00 07430-016 0.15–50 –25 TE0MPERATU2R5E (°C) 50 75 85 07430-019 Figure 10. Output Current vs. Receiver Output Low Voltage Figure 13. Receiver Output Low Voltage vs. Temperature (IOUT = 8 mA) 0 80 70 –5 60 A) A) m m T ( –10 T ( 50 N N E E R R 40 UR –15 UR T C T C 30 U U P P T –20 T 20 U U O O 10 –25 0 –303.50 3.75 4.O00UTPUT V4.O25LTAGE 4(.V5)0 4.75 5.00 07430-017 –100 0.5 1.0 1O.5UTPU2T.0 VOL2T.A5GE (3V.0) 3.5 4.0 4.5 07430-020 Figure 11. Output Current vs. Receiver Output High Voltage Figure 14. Output Current vs. Driver Differential Output Voltage 4.75 3.00 2.95 4.70 2.90 V) V) E ( E ( AG 4.65 AG 2.85 T T L L O O 2.80 V V T T U 4.60 U P P 2.75 T T U U O O 2.70 4.55 2.65 4.50–50 –25 TE0MPERATU2R5E (°C) 50 75 85 07430-018 2.60–50 –25 TE0MPERATU2R5E (°C) 50 75 85 07430-021 Figure 12. Receiver Output High Voltage vs. Temperature (IOUT = 8 mA) Figure 15. Driver Differential Output Voltage vs. Temperature (RL = 56.3 Ω) Rev. D | Page 7 of 16

ADM1490E/ADM1491E Data Sheet 80 70 1 A) 60 m T ( 50 N E R UR 40 C T U 30 P T U O 20 3 1000 0.5 1.0 OU1.T5PUT V2O.0LTAG2E.5 (V) 3.0 3.5 4.0 07430-022 CCHH31 25VV CH2 2V M200ns A CH1 1.6V 07430-032 Figure 16. Output Current vs. Driver Output Low Voltage Figure 19. Unloaded Driver Differential Outputs 0 –10 1 A) –20 m T ( –30 N E R UR –40 C T U –50 P T U O –60 3 ––87000 0.5 1.0 1.5OUT2P.0UT V2O.5LTA3G.0E (V)3.5 4.0 4.5 5.0 07430-023 CCHH31 25VV CH2 2V M200ns A CH1 1.6V 07430-033 Figure 17. Output Current vs. Driver Output High Voltage Figure 20. Loaded Driver Differential Outputs (RL Differential = 54 Ω, CL = 100 pF) 1.30 1.25 1.20 DRIVER ENABLED mA) 1.15 T ( N 1.10 E R UR 1.05 C UT 1.00 P T U 0.95 O 0.90 DRIVER DISABLED 0.85 0.80–50 –25 TE0MPERATU2R5E (°C) 50 75 85 07430-024 Figure 18. Output Current vs. Temperature Rev. D | Page 8 of 16

Data Sheet ADM1490E/ADM1491E TEST CIRCUITS Y RL 2 DI VOD2 VOUT VCC Z R2L Y RL VOC 110Ω DI S1 S2 07430-003 DE Z 5C0LpF 07430-006 Figure 21. Driver Voltage Measurements Figure 24. Driver Enable/Disable Timing Y 375Ω A DI VOD3 60Ω Z 375Ω VTEST 07430-004 B RE CL VOUT07430-007 Figure 22. Driver Voltage Measurements Figure 25. Receiver Propagation Delay +1.5V VCC S1 Y CL –1.5V RL S2 DI Z RL CL 07430-005 RE RE CL VOUT 07430-008 Figure 23. Driver Propagation Delay Figure 26. Receiver Enable/Disable Timing Rev. D | Page 9 of 16

ADM1490E/ADM1491E Data Sheet THEORY OF OPERATION The ADM1490E/ADM1491E are RS-422/RS-485 transceivers that ESD TRANSIENT PROTECTION SCHEME operate from a single 5 V ± 5% power supply. The ADM1490E/ The ADM1490E/ADM1491E use protective clamping ADM1491E are intended for balanced data transmission and structures on their inputs and outputs to clamp the voltage to a comply with both TIA/EIA-485-A and TIA/EIA-422-B. Each safe level and dissipate the energy present in ESD (electrostatic). device contains a differential line driver and a differential line The protection structure achieves ESD protection up to ±8 kV receiver and is suitable for full-duplex data transmission. human body model (HBM). The input impedance of the ADM1490E/ADM1491E is 12 kΩ, ESD Testing allowing up to 32 transceivers on the differential bus. A thermal Two coupling methods are used for ESD testing: contact dis- shutdown circuit prevents excessive power dissipation caused by charge and air gap discharge. Contact discharge calls for a direct bus contention or by output shorting. This feature forces the driver connection to the unit being tested; air gap discharge uses a higher output into a high impedance state if, during fault conditions, test voltage but does not make direct contact with the unit under a significant temperature increase is detected in the internal test. With air discharge, the discharge gun is moved toward the driver circuitry. unit under test, developing an arc across the air gap; therefore, The receiver contains a fail-safe feature that results in a logic the term air discharge. This method is influenced by humidity, high output state if the inputs are unconnected (floating). temperature, barometric pressure, distance, and rate of closure The ADM1490E/ADM1491E feature very low propagation delay, of the discharge gun. The contact discharge method, though ensuring maximum baud rate operation. The balanced driver less realistic, is more repeatable and is gaining acceptance and ensures distortion-free transmission. preference over the air gap method. Another important specification is a measure of the skew between Although very little energy is contained within an ESD pulse, the complementary outputs. Excessive skew impairs the noise the extremely fast rise time, coupled with high voltages, can cause immunity of the system and increases the amount of electro- failures in unprotected semiconductors. Catastrophic destruction magnetic interference (EMI). can occur immediately because of arcing or heating. Even if cata- strophic failure does not occur immediately, the device can suffer TRUTH TABLES from parametric degradation, resulting in degraded performance. Table 6. Abbreviations in Truth Tables The cumulative effects of continuous exposure can eventually Letter Description lead to complete failure. H High level HIGH I Indeterminate VOLTAGE R2 GENERATOR L Low level C1 DEVICE UNDER TEST X Irrelevant Z High impedance (off) NOTES Table 7. Transmitting 1 . THRHU2 EM= AE1SN50D B0 TΩOEDASYNT DM M OCE1DT E=HL O1 0(D±0 8pUkFSV.E) DW IIST HTHE 07430-025 Inputs Outputs Figure 27. ESD Generator DE DI Z Y I/O lines are particularly vulnerable to ESD damage. Simply H H L H touching or plugging in an I/O cable may result in a static dis- H L H L charge that can damage or destroy the interface product connected L X Z Z to the I/O port. It is, therefore, extremely important to have high levels of ESD protection on the I/O lines. Table 8. Receiving The ESD discharge can induce latch-up in the device under test. Inputs Output Therefore, it is important to conduct ESD testing on the I/O pins RE A − B RO while power is applied to the device. This type of testing is more L ≥ +0.2 V H representative of a real-world I/O discharge in which the equip- L ≤ −0.2 V L ment is operating normally when the discharge occurs. L −0.2 V ≤ A − B ≤ +0.2 V I L Inputs open H H X Z Rev. D | Page 10 of 16

Data Sheet ADM1490E/ADM1491E 100% 90% K A E P I 36.8% 10% tRL tDL TIME (t) 07430-026 Figure 28. Human Body Model ESD Current Waveform Table 9. ADM1490E/ADM1491E ESD Test Results ESD Test Method Input/Output Pins Other Pins Human Body Model ±8 kV ±4 kV Rev. D | Page 11 of 16

ADM1490E/ADM1491E Data Sheet APPLICATIONS INFORMATION DIFFERENTIAL DATA CABLE AND DATA RATE Differential data transmission reliably transmits data at high Twisted pair is the transmission line of choice for RS-485 rates over long distances and through noisy environments. communications. Twisted pair cable tends to cancel common- Differential transmission nullifies the effects of ground shifts mode noise and causes cancellation of the magnetic fields and noise signals that appear as common-mode voltages on the generated by the current flowing through each wire, thereby line. There are two main standards approved by the Electronics reducing the effective inductance of the pair. Industries Association (EIA) that specify the electrical char- An RS-485 transmission line can have as many as 32 trans- acteristics of transceivers used in differential data transmission. ceivers on the bus. Only one driver can transmit at a time, but The RS-422 standard specifies data rates of up to 10 MBaud and multiple receivers may be enabled simultaneously. line lengths of up to 4000 feet. A single driver can drive a trans- As with any transmission line, it is important to minimize mission line with as many as 10 receivers. reflections. This can be achieved by terminating the extreme The RS-485 standard addresses true multipoint communications. ends of the line using resistors equal to the characteristic This standard meets or exceeds all of the requirements of RS-422, impedance of the line. Keep stub lengths of the main line as and it allows as many as 32 drivers and 32 receivers to connect short as possible. A properly terminated transmission line to a single bus. An extended common-mode range of −7 V to appears purely resistive to the driver. +12 V is defined. The most significant difference between the TYPICAL APPLICATIONS RS-422 and the RS-485 is that the drivers with RS-485 can be Figure 29 shows a typical configuration for a full-duplex point- disabled, allowing more than one driver to be connected to a to-point application using the ADM1490E. Figure 30 shows a single line, with as many as 32 drivers connected to a single line. typical configuration for a full-duplex multipoint application Only one driver should be enabled at a time, but the RS-485 using the ADM1491E. To minimize reflections, the lines must standard contains additional specifications to guarantee device be terminated at the receiving end in its characteristic impedance, safety in the event of line contention. and stub lengths off the main line must be kept as short as possible. VCC VCC VCC ADM1490E ADM1490E A Y RO R RT D DI B Z Z B DI D Y RT A R RO VCC N1.O MTAEXSIMUM NGUNMDBER OF NODES = 32. GND 07430-027 Figure 29. Typical Point-to-Point Full-Duplex Application Rev. D | Page 12 of 16

Data Sheet ADM1490E/ADM1491E MAXIMUM NUMBER OF NODES = 32 MASTER VCC SLAVE A Y RO R RT D DI B Z RE DE DE Z B RE DI D Y RT A R RO VCC ADM1491E ADM1491E A B Z Y A B Z Y SLAVE SLAVE ADM1491E R R ADM1491E D D RO RE DE DI RO RE DE DI N1.O RTTE ISS EQUAL TO THE CHARACTERISTIC IMPEDANCE OF THE CABLE. 07430-028 Figure 30. Typical RS-485 Full-Duplex Application Rev. D | Page 13 of 16

ADM1490E/ADM1491E Data Sheet OUTLINE DIMENSIONS 8.75 (0.3445) 8.55 (0.3366) 14 8 4.00 (0.1575) 6.20 (0.2441) 3.80 (0.1496) 1 7 5.80 (0.2283) 1.27 (0.0500) 0.50 (0.0197) BSC 45° 1.75 (0.0689) 0.25 (0.0098) 0.25 (0.0098) 1.35 (0.0531) 8° 0.10 (0.0039) 0° COPLANARITY SEATING 0.10 0.51 (0.0201) PLANE 0.25 (0.0098) 1.27 (0.0500) 0.31 (0.0122) 0.17 (0.0067) 0.40 (0.0157) COMPLIANTTO JEDEC STANDARDS MS-012-AB CONTROLLING DIMENSIONSARE IN MILLIMETERS; INCH DIMENSIONS A (RINEFPEARREENNCTEH EOSNELSY)AANRDE ARROEU NNODETDA-POPFRFO MPIRLLIAIMTEE TFEORR EUQSUEI VINA LDEENSTIGS NF.OR 060606- Figure 31. 14-Lead Standard Small Outline Package [SOIC_N] Narrow Body (R-14) Dimensions shown in millimeters and (inches) 3.10 3.00 2.90 10 6 5.15 3.10 4.90 3.00 4.65 2.90 1 5 PIN1 IDENTIFIER 0.50BSC 0.95 15°MAX 0.85 1.10MAX 0.75 0.70 0.15 0.30 6° 0.23 0.55 CO0P.0L5ANARITY 0.15 0° 0.13 0.40 0.10 COMPLIANTTOJEDECSTANDARDSMO-187-BA 091709-A Figure 32. 10-Lead Mini Small Outline Package [MSOP] (RM-10) Dimensions shown in millimeters Rev. D | Page 14 of 16

Data Sheet ADM1490E/ADM1491E 5.00(0.1968) 4.80(0.1890) 8 5 4.00(0.1574) 6.20(0.2441) 3.80(0.1497) 1 4 5.80(0.2284) 1.27(0.0500) 0.50(0.0196) BSC 1.75(0.0688) 0.25(0.0099) 45° 0.25(0.0098) 1.35(0.0532) 8° 0.10(0.0040) 0° COPLANARITY 0.51(0.0201) 0.10 SEATING 0.31(0.0122) 0.25(0.0098) 10..2470((00..00510507)) PLANE 0.17(0.0067) COMPLIANTTOJEDECSTANDARDSMS-012-AA C(RINOEFNPEATRRREOENNLCLTEIHNEOGSNDELISYM)AEANNRDSEIOARRNOESUNANORDETEDAIN-POMPFRIFLOLMPIMIRLELIATIMTEEERTFSEO;RIRNECUQHSUEDIVIINMAELDENENSSTIIOGSNNFS.OR 012407-A Figure 33. 8-Lead Standard Small Outline Package [SOIC_N] Narrow Body (R-8) Dimensions shown in millimeters and (inches) 3.20 3.00 2.80 8 5 5.15 3.20 4.90 3.00 4.65 2.80 1 4 PIN1 IDENTIFIER 0.65BSC 0.95 15°MAX 0.85 1.10MAX 0.75 0.80 0.15 0.40 6° 0.23 0.55 CO0P.0L50A.1N0ARICTOYMPLIANT0.T25OJEDECSTA0°NDARDS0M.0O9-187-AA 0.40 10-07-2009-B Figure 34. 8-Lead Mini Small Outline Package [MSOP] (RM-8) Dimensions shown in millimeters ORDERING GUIDE Temperature Package Model1 Range Package Description Option Branding ADM1490EBRZ −40°C to +85°C 8-Lead Standard Small Outline Package, Narrow Body [SOIC_N] R-8 ADM1490EBRZ-REEL7 −40°C to +85°C 8-Lead Standard Small Outline Package, Narrow Body [SOIC_N] R-8 ADM1490EBRMZ −40°C to +85°C 8-Lead Mini Small Outline Package [MSOP] RM-8 F0E ADM1490EBRMZ-REEL7 −40°C to +85°C 8-Lead Mini Small Outline Package [MSOP] RM-8 F0E ADM1491EBRZ −40°C to +85°C 14-Lead Standard Small Outline Package, Narrow Body [SOIC_N] R-14 ADM1491EBRZ-REEL7 −40°C to +85°C 14-Lead Standard Small Outline Package, Narrow Body [SOIC_N] R-14 ADM1491EBRMZ −40°C to +85°C 10-Lead Mini Small Outline Package [MSOP] RM-10 F0D ADM1491EBRMZ-REEL7 −40°C to +85°C 10-Lead Mini Small Outline Package [MSOP] RM-10 F0D 1 Z = RoHS Compliant Part. Rev. D | Page 15 of 16

ADM1490E/ADM1491E Data Sheet NOTES ©2008–2012 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D07430-0-2/12(D) Rev. D | Page 16 of 16

Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: A nalog Devices Inc.: ADM1490EBRMZ ADM1490EBRMZ-REEL7 ADM1490EBRZ ADM1490EBRZ-REEL7 ADM1491EBRMZ ADM1491EBRMZ-REEL7 ADM1491EBRZ ADM1491EBRZ-REEL7