3.3 V, ±15 kV ESD-Protected, Half- and Full-Duplex, RS-485/RS-422 Transceivers ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E FEATURES FUNCTIONAL BLOCK DIAGRAMS TIA/EIA RS-485/RS-422 compliant VCC ±15 kV ESD protection on RS-485 input/output pins ADM3483E/ Data rates ADM3486E ADM3483E/ADM3488E: 250 kbps RO R ADM3486E: 2.5 Mbps ADM3490E/ADM3491E: 12 Mbps RE A Half- and full-duplex options DE B Up to 32 nodes on the bus DI D RLoewce pivoewr eorp sehnu-ctdirocuwint, cfauirlr-esanfte design GND 06284-001 (ADM3483E/ADM3486E/ADM3491E only) Figure 1. Outputs high-Z when disabled or powered off Common-mode input range: −7 V to +12 V VCC Thermal shutdown and short-circuit protection ADM3488E/ ADM3490E Industry-standard 75176 pinout A 8-lead and 14-lead narrow SOIC packages RO R B APPLICATIONS Power/energy metering Z DI D Telecommunications Y EInMdIu-ssetrniasilt civoen tsryoslt ems GND 06284-002 Local area networks Figure 2. GENERAL DESCRIPTION VCC The ADM3483E/ADM3486E/ADM3488E/ADM3490E/ ADM3491E ADM3491E are 3.3 V, low power data transceivers with A ±15 kV ESD protection suitable for full- and half-duplex RO R B communication on multipoint bus transmission lines. They RE are designed for balanced data transmission, and they DE comply with TIA/EIA standards RS­485 and RS-422. The Z DI D Y ADM3483E/ADM3486E are half-duplex transceivers that sthhea rder divieffre arenndt iraelc leiinveesr .a Tnhde h fauvlel- sdeuppalreaxt eA eDnMab3le4 8in8Epu/ ts for GND 06284-003 Figure 3. ADM3490E/ADM3491E transceivers have dedicated differential line driver outputs and receiver inputs. The ADM3491E also features separate enable inputs for the driver and receiver. The devices have a 12 kΩ receiver input impedance, which allows up to 32 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. (continued on Page 3) 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 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 ©2006 Analog Devices, Inc. All rights reserved.

ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E TABLE OF CONTENTS Features..............................................................................................1 Devices Without Receiver/Driver Enable― ADM3488E/ Applications.......................................................................................1 ADM3490E.................................................................................14 General Description.........................................................................1 Low Power Shutdown Mode—ADM3483E/ ADM3486E/ ADM3491E.................................................................................14 Functional Block Diagrams.............................................................1 Driver Output Protection..........................................................14 Revision History...............................................................................2 Propagation Delay......................................................................14 Specifications.....................................................................................4 Line Length vs. Data Rate.........................................................14 Driver Timing Specifications......................................................5 ±15 kV ESD Protection.............................................................15 Receiver Timing Specifications..................................................6 Human Body Model..................................................................15 Absolute Maximum Ratings............................................................7 Typical Applications...................................................................15 ESD Caution..................................................................................7 Outline Dimensions.......................................................................18 Pin Configurations and Function Descriptions...........................8 Ordering Guide..........................................................................18 Test Circuits and Switching Characteristics..................................9 Typical Performance Characteristics...........................................11 Circuit Description.........................................................................14 Devices with Receiver/Driver Enable—ADM3483E/ ADM3486E/ ADM3491E...........................................................14 REVISION HISTORY 10/06—Rev. 0 to Rev. A Added ADM3483E and ADM3488E...............................Universal Changes to Figure 1 and Figure 2...................................................1 Inserted Table 3.................................................................................5 Changes to Figure 4 and Figure 5...................................................8 Inserted Figure 28 and Figure 29..................................................13 Changes to Figure 31 and Figure 32.............................................16 Changes to Figure 34......................................................................17 Updated Outline Dimensions.......................................................18 Changes to Ordering Guide..........................................................18 8/06—Revision 0: Initial Version Rev. A | Page 2 of 20

ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E GENERAL DESCRIPTION (continued from Page 1) Excessive power dissipation caused by bus contention or by output shorting is prevented with a thermal shut- The driver outputs of the ADM3483E/ADM3486E/ down circuit. ADM3488E are slew rate limited, in order to reduce EMI and data errors caused by reflections from improperly The parts are fully specified over the industrial temperature range terminated buses. The receiver has a fail-safe feature that and are available in 8-lead and 14-lead narrow SOIC packages. ensures a logic high output when the inputs are floating. Table 1. Selection Table Guaranteed Data Supply Half/Full Slew Rate Driver/Receiver ±15 kV ESD Protection Part No. Rate (Mbps) Voltage (V) Duplex Limited Enable on Bus Pins Pin Count ADM3483E 0.25 3.0 to 3.6 Half Yes Yes Yes 8 ADM3486E 2.5 3.0 to 3.6 Half Yes Yes Yes 8 ADM3488E 0.25 3.0 to 3.6 Full Yes No Yes 8 ADM3490E 12 3.0 to 3.6 Full No No Yes 8 ADM3491E 12 3.0 to 3.6 Full No Yes Yes 14 Rev. A | Page 3 of 20

ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E SPECIFICATIONS V = 3.3 V ± 0.3 V, T = T to T , unless otherwise noted. CC A MIN MAX Table 2. ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E Parameter Symbol Min Typ Max Unit Test Conditions/Comments DRIVER Differential Outputs Differential Output Voltage V 2.0 V R = 100 Ω (RS-422) (see Figure 7) OD L 1.5 V R = 54 Ω (RS-485) (see Figure 7) L 1.5 V R = 60 Ω (RS-485) (see Figure 8) L Δ|V | for Complementary Output States1 ∆V 0.2 V R = 54 Ω or 100 Ω (see Figure 7) OD OD L Common-Mode Output Voltage V 3 V R = 54 Ω or 100 Ω (see Figure 7) OC L Δ|V | for Complementary Output States1 ∆V 0.2 V R = 54 Ω or 100 Ω (see Figure 7) OC OC L Short-Circuit Output Current I −250 mA V = −7 V OSD OUT 250 mA V = 12 V OUT Output Leakage (Y, Z) (ADM3491E Only) I O Normal Mode 20 μA DE = 0 V, RE = 0 V, V = 0 V or 3.6 V, CC V = 12 V OUT −20 μA DE = 0 V, RE = 0 V, V = 0 V or 3.6 V, CC V = −7 V OUT Shutdown Mode 1 μA DE = 0 V, RE = V , V = 0 V or 3.6 V, CC CC V = 12 V OUT −1 μA DE = 0 V, RE = V , V = 0 V or 3.6 V, CC CC V = −7 V OUT Logic Inputs Input High Voltage V 2.0 V DE, DI, RE IH Input Low Voltage V 0.8 V DE, DI, RE IL Logic Input Current I ±2 μA DE, DI, RE IN1 RECEIVER Differential Inputs Differential Input Threshold Voltage V −0.2 0.2 V −7 V < V < +12 V TH CM Input Hysteresis ∆V 50 mV V = 0 V TH CM Input Resistance (A, B) RIN 12 kΩ −7 V < VCM < +12 V Input Current (A, B) I 1.0 mA DE = 0 V, V = 0 V or 3.6 V, V = 12 V IN2 CC IN −0.8 mA DE = 0 V, V = 0 V or 3.6 V, V = −7 V CC IN RO Logic Output Output High Voltage V V − 0.4 V I = −1.5 mA, V = 200 mV (see Figure 9) OH CC OUT ID Output Low Voltage V 0.4 V I = 2.5 mA, V = 200 mV (see Figure 9) OL OUT ID Short-Circuit Output Current I ±8 ±60 mA 0 V < V < V OSR RO CC Tristate Output Leakage Current I ±1 μA V = 3.6 V, 0 V < V < V OZR CC OUT CC POWER SUPPLY Voltage Range V 3.0 3.6 V CC Supply Current I 1.1 2.2 mA No load, DI = 0 V or V , DE = V , CC CC CC RE = 0 V or V CC 0.95 1.9 mA No load, DI = 0 V or V , DE = 0 V, CC RE = 0 V Shutdown Current I 0.002 1 μA DE = 0 V, RE = V , DI = 0 V or V SHDN CC 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 Δ|VOD| and Δ|VOC| are the changes in VOD and VOC, respectively, when DI input changes state. Rev. A | Page 4 of 20

ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E DRIVER TIMING SPECIFICATIONS V = 3.3 V, T = 25°C. CC A Table 3. ADM3483E/ADM3488E Parameter Symbol Min Typ Max Unit Test Conditions/Comments MAXIMUM DATA RATE 250 kbps DIFFERENTIAL OUTPUT DELAY t 600 900 1400 ns R = 60 Ω (see Figure 10) DD L DIFFERENTIAL OUTPUT TRANSITION TIME t 400 740 1200 ns R = 60 Ω (see Figure 10) TD L PROPAGATION DELAY From Low to High Level t 700 930 1500 ns R = 27 Ω (see Figure 11) PLH L From High to Low Level t 700 930 1500 ns R = 27 Ω (see Figure 11) PHL L |t − t | PROPAGATION DELAY SKEW1 t ±50 ns R = 27 Ω (see Figure 11) PLH PHL PDS L ENABLE/DISABLE TIMING (ADM3483E ONLY) Enable Time to Low Level t 900 1300 ns R = 110 Ω (see Figure 13) PZL L Enable Time to High Level t 600 800 ns R = 110 Ω (see Figure 12) PZH L Disable Time from Low Level t 50 80 ns R = 110 Ω (see Figure 13) PLZ L Disable Time from High Level t 50 80 ns R = 110 Ω (see Figure 12) PHZ L Enable Time from Shutdown to Low Level t 1.9 2.7 μs R = 110 Ω (see Figure 13) PSL L Enable Time from Shutdown to High Level t 2.2 3.0 μs R = 110 Ω (see Figure 12) PSH L 1 Measured on |tPLH (Y) − tPHL (Y)| and |tPLH (Z) − tPHL (Z)|. V = 3.3 V, T = 25°C. CC A Table 4. ADM3486E Parameter Symbol Min Typ Max Unit Test Conditions/Comments MAXIMUM DATA RATE 2.5 Mbps DIFFERENTIAL OUTPUT DELAY t 20 42 70 ns R = 60 Ω (see Figure 10) DD L DIFFERENTIAL OUTPUT TRANSITION TIME t 15 28 60 ns R = 60 Ω (see Figure 10) TD L PROPAGATION DELAY From Low to High Level t 20 42 75 ns R = 27 Ω (see Figure 11) PLH L From High to Low Level t 20 42 75 ns R = 27 Ω (see Figure 11) PHL L |t − t | PROPAGATION DELAY SKEW1 t −6 ±12 ns R = 27 Ω (see Figure 11) PLH PHL PDS L ENABLE/DISABLE TIMING Enable Time to Low Level t 52 100 ns R = 110 Ω (see Figure 13) PZL L Enable Time to High Level t 52 100 ns R = 110 Ω (see Figure 12) PZH L Disable Time from Low Level t 40 80 ns R = 110 Ω (see Figure 13) PLZ L Disable Time from High Level t 40 80 ns R = 110 Ω (see Figure 12) PHZ L Enable Time from Shutdown to Low Level t 700 1000 ns R = 110 Ω (see Figure 13) PSL L Enable Time from Shutdown to High Level t 700 1000 ns R = 110 Ω (see Figure 12) PSH L 1 Measured on |tPLH (Y) − tPHL (Y)| and |tPLH (Z) − tPHL (Z)|. Rev. A | Page 5 of 20

ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E V = 3.3 V, T = 25°C. CC A Table 5. ADM3490E/ADM3491E Parameter Symbol Min Typ Max Unit Test Conditions/Comments MAXIMUM DATA RATE 12 15 Mbps DIFFERENTIAL OUTPUT DELAY t 1 22 35 ns R = 60 Ω (see Figure 10) DD L DIFFERENTIAL OUTPUT TRANSITION TIME t 3 11 25 ns R = 60 Ω (see Figure 10) TD L PROPAGATION DELAY From Low to High Level t 7 23 35 ns R = 27 Ω (see Figure 11) PLH L From High to Low Level t 7 23 35 ns R = 27 Ω (see Figure 11) PHL L |t − t | PROPAGATION DELAY SKEW1 t −1.4 ±8 ns R = 27 Ω (see Figure 11) PLH PHL PDS L ENABLE/DISABLE TIMING (ADM3491E ONLY) Enable Time to Low Level t 42 90 ns R = 110 Ω (see Figure 13) PZL L Enable Time to High Level t 42 90 ns R = 110 Ω (see Figure 12) PZH L Disable Time from Low Level t 35 80 ns R = 110 Ω (see Figure 13) PLZ L Disable Time from High Level t 35 80 ns R = 110 Ω (see Figure 12) PHZ L Enable Time from Shutdown to Low Level t 650 900 ns R = 110 Ω (see Figure 13) PSL L Enable Time from Shutdown to High Level t 650 900 ns R = 110 Ω (see Figure 12) PSH L 1 Measured on |tPLH (Y) − tPHL (Y)| and |tPLH (Z) − tPHL (Z)|. RECEIVER TIMING SPECIFICATIONS V = 3.3 V, T = 25°C. CC A Table 6. ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E Parameter Symbol Min Typ Max Unit Test Conditions/Comments PROPAGATION DELAY From Low to High Level t RPLH ADM3486E/ADM3490E/ADM3491E 25 62 90 ns V = 0 V to 3.0 V, C = 15 pF (see Figure 14) ID L ADM3483E/ADM3488E 25 75 120 ns V = 0 V to 3.0 V, C = 15 pF (see Figure 14) ID L From High to Low Level t RPHL ADM3486E/ADM3490E/ADM3491E 25 62 90 ns V = 0 V to 3.0 V, C = 15 pF (see Figure 14) ID L ADM3483E/ADM3488E 25 75 120 ns V = 0 V to 3.0 V, C = 15 pF (see Figure 14) ID L |t − t | PROPAGATION DELAY SKEW t RPLH RPHL RPDS ADM3486E/ADM3490E/ADM3491E +6 ±10 ns V = 0 V to 3.0 V, C = 15 pF (see Figure 14) ID L ADM3483E/ADM3488E +12 ±20 ns V = 0 V to 3.0 V, C = 15 pF (see Figure 14) ID L ENABLE/DISABLE TIMING (ADM3483E/ADM3486E/ ADM3491E ONLY) Enable Time to Low Level t 25 50 ns C = 15 pF (see Figure 15) RPZL L Enable Time to High Level t 25 50 ns C = 15 pF (see Figure 15) RPZH L Disable Time from Low Level t 25 45 ns C = 15 pF (see Figure 15) RPLZ L Disable Time from High Level t 25 45 ns C = 15 pF (see Figure 15) RPHZ L Enable Time from Shutdown to Low Level t 720 1400 ns C = 15 pF (see Figure 15) RPSL L Enable Time from Shutdown to High Level t 720 1400 ns C = 15 pF (see Figure 15) RPSH L Time to Shutdown1 t 80 190 300 ns SHDN 1 The transceivers are put into shutdown mode by bringing the RE high and the DE low. If the inputs are in this state for less than 80 ns, the parts are guaranteed not to enter shutdown. If the parts are in this state for 300 ns or more, the parts are guaranteed to enter shutdown. Rev. A | Page 6 of 20

ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E ABSOLUTE MAXIMUM RATINGS T = 25°C, unless otherwise noted. Stresses above those listed under Absolute Maximum Ratings A may cause permanent damage to the device. This is a stress Table 7. rating only; functional operation of the device at these or any Parameter Rating other conditions above those indicated in the operational VCC to GND −0.3 V to +6 V section of this specification is not implied. Exposure to absolute Digital Input/Output Voltage (DE, RE, DI) −0.3 V to +6 V maximum rating conditions for extended periods may affect Receiver Output Voltage (RO) −0.3 V to (VCC + 0.3 V) device reliability. Driver Output (A, B, Y, Z)/Receiver Input (A, B) Voltage −8 V to +13 V Driver Output Current ±250 mA ESD CAUTION Operating Temperature Range −40°C to +85°C Storage Temperature Range −65°C to +150°C θJA Thermal Impedance 8-Lead SOIC_N 158°C/W 14-Lead SOIC_N 120°C/W Lead Temperature, Soldering (20 sec) 260°C Rev. A | Page 7 of 20

ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS NC 1 14 VCC RO 2 13 VCC RE 3 ADM3491E 12 A DE 4 TOP VIEW 11 B RO 1 ADM3483E/ 8 VCC VCC 1 ADM3488E/ 8 A DI 5 (Not to Scale) 10 Z RE 2 ADM3486E 7 B RO 2 ADM3490E 7 B GND 6 9 Y DDEI 34 (NToOtPtoVSIEcaWle) 65 AGND 06284-004 GNDDI 34 (NToOtPtoVSIEcaWle) 65 ZY 06284-005 GND 7NC = NO CONNECT8 NC 06284-006 Figure 4. ADM3483E/ADM3486E Figure 5. ADM3488E/ADM3490E Figure 6. ADM3491E Pin Configuration Pin Configuration Pin Configuration Table 8. Pin Function Descriptions ADM3483E/ ADM3488E/ ADM3486E ADM3490E ADM3491E Pin No. Pin No. Pin No. Mnemonic Description 1 2 2 RO Receiver Output. If A > B by 200 mV, RO is high; if A < B by 200 mV, RO is low. 2 N/A 3 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. 3 N/A 4 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. 4 3 5 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. 5 4 6, 7 GND Ground. N/A 5 9 Y Noninverting Driver Output. 6 N/A N/A A Noninverting Receiver Input A and Noninverting Driver Output A. N/A 8 12 A Noninverting Receiver Input A. N/A 6 10 Z Inverting Driver Output. 7 N/A N/A B Inverting Receiver Input B and Inverting Driver Output B. N/A 7 11 B Inverting Receiver Input B. 8 1 13, 14 VCC Power Supply, 3.3 V ± 0.3 V. Bypass VCC to GND with a 0.1 μF capacitor. N/A N/A 1, 8 NC No Connect. Not internally connected. Can be connected to GND. Rev. A | Page 8 of 20

ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E TEST CIRCUITS AND SWITCHING CHARACTERISTICS VOM Y RL/2 RL = 27Ω S1 VOD D OUT Figure 7. DrZiver DiffereRnLt/2ial OuVtOpCut 06284-007Vo ltage and GENERATOR1 50ΩVCC CL = 15pF2 Common-Mode Output Voltage VOH + VOL VOM = 2 ≈ 1.5V 375Ω 1PPR = 250kHz, 50% DUTY CYCLE,tR ≤ 6.0ns, ZO = 50Ω. VCM = 2CL INCLUDES PROBE AND STRAY CAPACITANCE. –7V TO +12V D VOD RL 3V VCC 375Ω 06284-008 IN 1.5V 1.5V 0V Figure 8. Driver Differential Output Voltage with t t Varying Common-Mode Voltage PLH PHL VOH OYUT VOM VOM VOL VID R tPHL tPLH VOH 0 Z VOL I(O+L) VOH I(O–H) 06284-009 OUT VOM VOM VOL 06284-011 Figure 9. Receiver Output Voltage High and Output Voltage Low Figure 11. Driver Propagation Delays CL S1 0V OR 3V D OUT D R60LΩ = OUT CL = 50pF2 RL = 110Ω GENERATOR1 50Ω VCC GENERATOR1 50Ω CL = 15pF2 VOH + VOL VOM = 2 ≈ 1.5V 1PPR = 250kHz, 50% DUTY CYCLE,tR ≤ 6.0ns, ZO = 50Ω. 2CL INCLUDES PROBE AND STRAY CAPACITANCE. 1PPR = 250kHz, 50% DUTY CYCLE,tR ≤ 6.0ns, ZO = 50Ω. 2CL INCLUDES PROBE AND STRAY CAPACITANCE. +3V IN +1.5V +1.5V 3V 0V IN 1.5V 1.5V tDD tDD 0V 90% 90% ≈ +2V tPZH tPHZ OUT 1500%% tTD 5100%%tTD ≈ –2V 06284-010 OUT VOM 0.25V 0VVOH 06284-012 Figure 10. Driver Differential Output Delay and Transition Times Figure 12. Driver Enable and Disable Times (tPZH, tPSH, tPHZ) Rev. A | Page 9 of 20

ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E VCC RL = 110Ω S1 0V OR 3V D OUT VID R OUT CL = 50pF2 GENERATOR1 50Ω CL = 15pF2 GENERATOR1 50Ω 1.5V VCC 0V VOM = 2 12PCPL RIN =C 2L5U0DkEHSz, P5R0%OB DEU ATNY DC YSCTRLEA,Yt RC A≤P 6A.0CnIsT,A ZNOC =E .50Ω. 12PCPL RIN =C 2L5U0DkEHSz, P5R0%OB DEU ATNY DC YSCTRLEA,Yt CR A≤P 6A.0CnIsT,A ZNOC =E .50Ω. 3V 3V IN 1.5V 1.5V IN 1.5V 1.5V 0V 0V t t PSL PLZ t t VCC RPLH RPHL OUT VOM VCC 0.25V VOL 06284-013 OUT VOM VOM 0V 06284-014 Figure 13. Driver Enable and Disable Times (tPZL, tPSL, tPLZ) Figure 14. Receiver Propagation Delays S1 +1.5V S3 1kΩ VCC –1.5V VID R S2 CL2 GENERATOR1 50Ω 1PPR = 250kHz, 50% DUTY CYCLE,tR ≤ 6.0ns, ZO = 50Ω. 2CL INCLUDES PROBE AND STRAY CAPACITANCE. +3V +3V S1 OPEN S1 CLOSED IN +1.5V S2 CLOSED IN +1.5V S2 OPEN S3 = +1.5V S3 = –1.5V 0V 0V tRPZH tRPZL tRPSH tRPSL VOH VCC OUT +1.5V OUT +1.5V 0V VOL +3V +3V S1 OPEN S1 CLOSED IN +1.5V S2 CLOSED IN +1.5V S2 OPEN S3 = +1.5V S3 = –1.5V 0V 0V tRPHZ tRPLZ OUT VOH VCC OUT +0.25V 0V VOL +0.25V 06284-015 Figure 15. Receiver Enable and Disable Times Rev. A | Page 10 of 20

ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E TYPICAL PERFORMANCE CHARACTERISTICS 25 0.8 IRO = 2.5mA 0.7 20 V) 0.6 URRENT (mA) 15 W VOLTAGE ( 00..45 OUTPUT C 10 UTPUT LO 00..23 O 5 0.1 0 0 0 0.5 1O.0UTPUT1 .L5OW VO2L.0TAGE (V2.)5 3.0 3.5 06284-021 –40 TE1M0PERATURE (°C) 60 85 06284-024 Figure 16. Output Current vs. Receiver Output Low Voltage Figure 19. Receiver Output Low Voltage vs. Temperature –18 100 –16 90 80 –14 NT (mA) –12 NT (mA) 7600 RE –10 RE R R 50 U U C –8 C UT UT 40 TP –6 TP U U 30 O O –4 20 –2 10 0 0 0 0.5 1O.0UTPUT1 H.5IGH VO2L.0TAGE (2V.)5 3.0 3.5 06284-022 0 0.5 DIFF1E.0RENTIA1L.5 OUTPU2T.0 VOLTA2G.5E (V) 3.0 3.5 06284-025 Figure 17. Output Current vs. Receiver Output High Voltage Figure 20. Driver Output Current vs. Differential Output Voltage 3.30 2.6 IRO = –1.5mA RL = 54Ω 2.5 V) 3.25 E ( 2.4 V) AG E ( LT 2.3 G 3.20 O A V H VOLT 3.15 UTPUT 22..21 G O HI L 2.0 PUT 3.10 NTIA 1.9 T E U R O FE 1.8 3.05 F DI 1.7 3.00 1.6 –50 –25 TE0MPERATU2R5E (°C) 50 75 06284-023 –50 –25 TE0MPERATU2R5E (°C) 50 75 06284-026 Figure 18. Receiver Output High Voltage vs. Temperature Figure 21. Driver Differential Output Voltage vs. Temperature Rev. A | Page 11 of 20

ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E 120 0.9 0.8 100 A) 0.7 CURRENT (mA) 6800 N CURRENT (µ 000...654 T W U O TP 40 TD 0.3 U U O H S 0.2 20 0.1 0 0 0 2 OU4TPUT LOW6 VOLTAGE8 (V) 10 12 06284-027 –50 –25 TE0MPERATU2R5E (°C) 50 75 06284-030 Figure 22. Output Current vs. Driver Output Low Voltage Figure 25. Shutdown Current vs. Temperature 120 100 A) DI m 80 T ( 3 N E R R 60 U C Y T U TP 40 U O 20 CH1 Z CH2 0–7 –6 –5 –O4UTP–3UT H–IG2H V–O1LTAG0E (V)1 2 3 4 06284-028 CCHH31 21..00VV ΩΩ CH2 1.0V Ω IMT 2400n0sp s1/.p2t5GAS / sCH3 1.44V 06284-031 Figure 23. Output Current vs. Driver Output High Voltage Figure 26. ADM3490E/ADM3491E Driver Propagation Delay 1.2 1.1 A) 1.0 VA– VB m T ( M1 N E 0.9 R R U Y C 0.8 L P P SU 0.7 RO 0.6 3 0.5–40 –10 TEMPER2A0TURE (°C) 50 80 06284-029 CMHA3T H 21. 0 2V.0Ω1V M 220000nnss 250MS/s 4ns/pt A CH2 1.24V 06284-032 Figure 24. Supply Current vs. Temperature Figure 27. ADM3490E/ADM3491E Receiver Propagation Delay, Driven by External RS-485 Device Rev. A | Page 12 of 20

ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E DI 3 VA – VB Y 1 RO Z M 06284-033 06284-034 CH1 500mV Ω CH2 500mV Ω M2.0µs 25.0MS/s 40.0ns/pt CH1 2.00V M20.0ms A CH1 40.0mV CH3 5.0V Ω A CH3 2.4V MATH 2.00V 20.0ms Figure 28. ADM3483E/ADM3488E Driver Propagation Delay Figure 29. ADM3483E/ADM3488E Receiver Propagation Delay Rev. A | Page 13 of 20

ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E CIRCUIT DESCRIPTION The ADM34xxE are low power transceivers for RS-485 and RS­422 Table 12. Receiving Truth Table communications. The ADM3483E/ADM3488E operate at data Receiving Input Receiving Output rates up to 250 kbps. The ADM3486E operates at data rates up A – B RO to 2.5 Mbps, and the ADM3490E/ADM3491E transmit at up to ≥ +0.2 V 1 12 Mbps. The ADM3488E/ADM3490E/ADM3491E are full- ≤ −0.2 V 0 duplex transceivers, and the ADM3483E/ADM3486E are half Inputs open 1 duplex. Driver enable (DE) and receiver enable (RE) pins are included on the ADM3483E/ADM3486E/ADM3491E. When LOW POWER SHUTDOWN MODE—ADM3483E/ disabled, the driver and receiver outputs are high impedance. ADM3486E/ ADM3491E DEVICES WITH RECEIVER/DRIVER ENABLE— The ADM3483E/ADM3486E/ADM3491E are put into a low ADM3483E/ ADM3486E/ ADM3491E power shutdown mode by bringing both RE high and DE low. The devices do not shut down unless both the driver and the Table 9. Transmitting Truth Table receiver are disabled (high impedance). In shutdown mode, the Transmitting Inputs Transmitting Outputs devices typically draw less than 1 μA of supply current. For RE DE DI A1, Y2 B1, Z2 Mode these devices, the t and the t enable times assume the part PSH PSL X3 1 1 1 0 Normal was in the low power shutdown mode; the t and the t PZH PZL X3 1 0 0 1 Normal enable times assume the receiver or the driver was disabled, but 0 0 X3 High-Z4 High-Z4 Normal the part was not shut down. 1 0 X3 High-Z4 High-Z4 Shutdown DRIVER OUTPUT PROTECTION 1 ADM3483E and ADM3486E only. 2 ADM3491E only. The ADM34xxE family implements two ways to prevent 3 X = don’t care. 4 High-Z = high impedance. excessive output current and power dissipation caused by faults or by bus contention. A current limit on the output stage Table 10. Receiving Truth Table provides immediate protection against short circuits over the Receiving Inputs Receiving Output whole common-mode voltage range (see the Typical RE DE1 DE2 A – B RO Mode Performance Characteristics section). In addition, a thermal 0 0 X3 ≥ +0.2 V 1 Normal shutdown circuit forces the driver outputs into a high 0 0 X3 ≤ −0.2 V 0 Normal impedance state if the die temperature rises excessively. 0 0 X3 Inputs open 1 Normal PROPAGATION DELAY 1 0 X3 X3 High-Z4 Shutdown Figure 11, Figure 14, Figure 26, and Figure 27 show the typical 1 ADM3483E and ADM3486E only. 2 ADM3491E only. propagation delays. Skew time is simply the difference between 3 X = don’t care. the low-to-high and the high-to-low propagation delays. Small 4 High-Z = high impedance. driver/receiver skew times help maintain a symmetrical mark- DEVICES WITHOUT RECEIVER/DRIVER ENABLE― space ratio (50% duty cycle). ADM3488E/ ADM3490E The receiver skew time, |t – t |, is under 10 ns (20 ns for PRHL PRHL the ADM3483E/ADM3488E). The driver skew time is 8 ns for Table 11. Transmitting Truth Table the ADM3490E/ADM3491E, 12 ns for the ADM3486E, and Transmitting Input Transmitting Outputs typically under 50 ns for the ADM3483E/ADM3488E. DI Z Y LINE LENGTH VS. DATA RATE 1 0 1 0 1 0 The RS-485/RS-422 standard covers line lengths up to 4000 feet. For line lengths greater than 4000 feet, Figure 34 illustrates an example of a line repeater. Rev. A | Page 14 of 20

ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E ±15 kV ESD PROTECTION HIGH R1 R2 VOLTAGE Two coupling methods are used for ESD testing: con- GENERATOR DEVICE UNDER tact discharge and air-gap discharge. Contact discharge C1 TEST calls for a direct connection to the unit being tested. Air- gap discharge uses a higher test voltage but does not make ESD TEST METHOD R2 C1 direct contact with the test unit. With air-gap discharge, HUMAN BODY MODEL 1.5kΩ 100pF ESD ASSOC. STD 55.1 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, 100% temperature, barometric pressure, distance, and rate of 90% closure of the discharge gun. The contact discharge method, while less realistic, is more repeatable and is K gaining acceptance and preference over the air- EA P I gap method. Although very little energy is contained within an ESD pulse, 36.8% 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 10% heating. Even if catastrophic failure does not occur immediately, trheseu dlte ivnic dee cgarna dsuedff epre rfrfoormm paanrcaem. Tethreic c duemguraladtaivtieo nef ftehcatts coafn tRL tDL TIMEt 06284-016 Figure 30. Human Body Model and Current Waveform continuous exposure can eventually lead to complete failure. TYPICAL APPLICATIONS Input/output lines are particularly vulnerable to ESD damage. The ADM3483E/ADM3486E/ADM3491E transceivers are Simply touching or connecting an input/output cable can result designed for bidirectional data communications on multipoint in a static discharge that can damage or completely destroy the bus transmission lines. The ADM3488E/ADM3490E full-duplex interface product connected to the input/output port. It is transceiver is designed to be used in a daisy-chain network extremely important, therefore, to have high levels of ESD topology or in a point-to-point application (see Figure 32). The protection on the input/output lines. ADM3483E/ADM3486E are half-duplex RS-485 transceivers The ESD discharge can induce latch-up in the device under test, that can be used in a multidrop bus configuration, as shown in so it is important that ESD testing on the input/output pins be Figure 31. The ADM3488E/ADM3490E/ADM3491E can also carried out while device power is applied. This type of testing is be used as a line repeater, for use with cable lengths longer than more representative of a real-world input/output discharge, 4000 feet, as shown in Figure 34. To minimize reflections, the which occurs when the equipment is operating normally. line must be terminated at both ends in its characteristic The transmitter outputs and receiver inputs of the ADM34xxE impedance, and stub lengths off the main line should be kept as family are characterized for protection to a ±15 kV limit using short as possible. the human body model. HUMAN BODY MODEL Figure 30 shows the human body model and the current wave- form 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 kΩ resistor. Rev. A | Page 15 of 20

ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E ADM3483E/ ADM3483E/ ADM3486E ADM3486E RO R R RO A A RE RE RT RT DE DE B B DI D D DI A B A B ADM3483E/ ADM3483E/ ADM3486E ADM3486E R R D D RO RE DE DI RO RE DE DI NOTES 12..RMTA IXSIMEUQMUANLUTMOBETHRE OCFHTARRAANCSTCEERIVISETRICS IOMNPEBDUASN:3C2E. OFTHECABLEUSED. 06284-017 Figure 31. ADM3483E/ADM3486E Typical Half-Duplex RS-485 Network MASTER SLAVE ADM3488E/ ADM3488E/ ADM3490E ADM3490E A Y RO R D DI B Z Z B DI D R RO Y A 06284-018 Figure 32. ADM3488E/ADM3490E Full-Duplex Point-to-Point Applications Rev. A | Page 16 of 20

ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E MASTER SLAVE ADM3491E ADM3491E A Y DE RO R B RT Z D DI RE DE Z B DI D Y RT A R RO RE SLAVE A B Z Y A B Z Y SLAVE R R D D ADM3491E ADM3491E RO RE DE DI RO RE DE DI NOTES 12.. MRTA IXSI MEUQMU ANLUTMOB ETHRE O CFH NAORDAECST:E 3R2I.STIC IMPEDANCE OF THE CABLE USED. 06284-019 Figure 33. ADM3491E Full-Duplex RS-485 Network ADM3488E/ ADM3490E/ ADM3491E A RO R B RT DATA IN RE DE Z DI D Y RT DATA OUT NOTES 21 .. RRIMTEP IASENDEDAQNDUCEAELP OITNOFST TOHHNEEACCDAHMBA3LR4EA9CU1ETS EEORDNI.SLTYI.C 06284-020 Figure 34. Line Repeater for ADM3488E/ADM3490E/ADM3491E Rev. A | Page 17 of 20

ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E OUTLINE DIMENSIONS 5.00(0.1968) 4.80(0.1890) 8 5 4.00 (0.1574) 6.20 (0.2440) 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) COMPLIANTTO JEDEC STANDARDS MS-012-AA C(RINOEFNPEATRRREOENNLCLTEIHN EOGSN EDLSIYM)AEANNRDSEI AORRNOESU NANORDEET DAIN-PO MPFRIFLO LMPIIMRLELIATIMTEEER TFSEO; RIRN ECUQHSU EDI VIINMA LEDENENSSTIIOGSN NFS.OR 060506-A Figure 35. 8-Lead Standard Small Outline Package [SOIC_N] Narrow Body (R-8) Dimensions shown in millimeters and (inches) 8.75 (0.3445) 8.55 (0.3366) 4.00 (0.1575) 14 8 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 C(RINOEFNPEATRRREOENNLCLTEIHN EOGSN EDLSIYM)AEANNRDSEI AORRNOESU NANORDEET DAIN-PO MPFRIFLO LMPIIMRLELIATIMTEEER TFSEO; RIRN ECUQHSU EDI VIINMA LEDENENSSTIIOGSN NFS.OR 060606-A Figure 36. 14-Lead Standard Small Outline Package [SOIC_N] Narrow Body (R-14) Dimensions shown in millimeters and (inches) ORDERING GUIDE Temperature Model Range Package Description Package Option Ordering Quantity ADM3483EARZ1 –40°C to +85°C 8-Lead Standard Small Outline Package (SOIC_N) R-8 ADM3483EARZ-REEL71 –40°C to +85°C 8-Lead Standard Small Outline Package (SOIC_N) R-8 1,000 ADM3486EARZ1 –40°C to +85°C 8-Lead Standard Small Outline Package (SOIC_N) R-8 ADM3486EARZ-REEL71 –40°C to +85°C 8-Lead Standard Small Outline Package (SOIC_N) R-8 1,000 ADM3488EARZ1 –40°C to +85°C 8-Lead Standard Small Outline Package (SOIC_N) R-8 ADM3488EARZ-REEL71 –40°C to +85°C 8-Lead Standard Small Outline Package (SOIC_N) R-8 1,000 ADM3490EARZ1 –40°C to +85°C 8-Lead Standard Small Outline Package (SOIC_N) R-8 ADM3490EARZ-REEL71 –40°C to +85°C 8-Lead Standard Small Outline Package (SOIC_N) R-8 1,000 ADM3491EARZ1 –40°C to +85°C 14-Lead Standard Small Outline Package (SOIC_N) R-14 ADM3491EARZ-REEL71 –40°C to +85°C 14-Lead Standard Small Outline Package (SOIC_N) R-14 1,000 1 Z = Pb-free part. Rev. A | Page 18 of 20

ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E NOTES Rev. A | Page 19 of 20

ADM3483E/ADM3486E/ADM3488E/ADM3490E/ADM3491E NOTES ©2006 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D06284-0-10/06(A) Rev. A | Page 20 of 20

Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: A nalog Devices Inc.: ADM3483EARZ ADM3483EARZ-REEL7 ADM3486EARZ ADM3486EARZ-REEL7 ADM3488EARZ ADM3488EARZ-REEL7 ADM3490EARZ ADM3490EARZ-REEL7 ADM3491EARZ ADM3491EARZ-REEL7