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Pin Configurations appear at end of data sheet. Functional Diagrams continued at end of data sheet. UCSP is a trademark of Maxim Integrated Products, Inc. For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maximintegrated.com. The MAX3483, MAX3485, MAX3486, MAX3488, MAX3490, and MAX3491 are 3.3V, low-power trans- ceivers for RS-485 and RS-422 communication. Each part contains one driver and one receiver. The MAX3483 and MAX3488 feature slew-rate-limited dri- vers that minimize EMI and reduce reflections caused by improperly terminated cables, allowing error-free data transmission at data rates up to 250kbps. The par- tially slew-rate-limited MAX3486 transmits up to 2.5Mbps. The MAX3485, MAX3490, and MAX3491 transmit at up to 10Mbps. Drivers are short-circuit current limited and are protect- ed against excessive power dissipation by thermal shutdown circuitry that places the driver outputs into a high-impedance state. The receiver input has a fail-safe feature that guarantees a logic-high output if both inputs are open circuit. The MAX3488, MAX3490, and MAX3491 feature full- duplex communication, while the MAX3483, MAX3485, and MAX3486 are designed for half-duplex communi- cation. Low-Power RS-485/RS-422 Transceivers Telecommunications Transceivers for EMI-Sensitive Applications Industrial-Control Local Area Networks ' Operate from a Single 3.3V Supply— No Charge Pump! ' Interoperable with +5V Logic ' 8ns Max Skew (MAX3485/MAX3490/MAX3491) ' Slew-Rate Limited for Errorless Data Transmission (MAX3483/MAX3488) ' 2nA Low-Current Shutdown Mode (MAX3483/MAX3485/MAX3486/MAX3491) ' -7V to +12V Common-Mode Input Voltage Range ' Allows up to 32 Transceivers on the Bus ' Full-Duplex and Half-Duplex Versions Available ' Industry Standard 75176 Pinout (MAX3483/MAX3485/MAX3486) ' Current-Limiting and Thermal Shutdown for Driver Overload Protection Ordering Information continued at end of data sheet. * Contact factory for for dice specifications. 3.3V-Powered, 10Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers 19-0333; Rev 0; 12/94 PART MAX3483CPA MAX3483CSA MAX3483C/D 0°C to +70°C 0°C to +70°C 0°C to +70°C TEMP. RANGE PIN-PACKAGE

8 Plastic DIP

Dice* PART NUMBER GUARANTEED DATA RATE (Mbps) SUPPLY VOLTAGE (V) HALF/FULL DUPLEX SLEW-RATE LIMITED DRIVER/ RECEIVER ENABLE SHUTDOWN CURRENT (nA) PIN COUNT MAX3483 0.25 Half Yes Yes 2 8 MAX3485 10 Half No Yes 2 8 MAX3486 2.5 Half Yes Yes 2 8 MAX3488 0.25 Full Yes No — 8 MAX3490 10 Full No No — 8 MAX3491 10 3.0 to 3.6 Full No Yes 2 14 MAX3483EPA MAX3483ESA -40°C to +85°C -40°C to +85°C 8 Plastic DIP 8 SO MAX3485CPA MAX3485CSA MAX3485C/D 0°C to +70°C 0°C to +70°C 0°C to +70°C 8 Plastic DIP 8 SO Dice* MAX3485EPA MAX3485ESA -40°C to +85°C -40°C to +85°C 8 Plastic DIP 8 SO MAX3483/MAX3485/MAX3486/ MAX3488/MAX3490/MAX3491

3.3V-Powered, 10Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers ABSOLUTE MAXIMUM RATINGS DC ELECTRICAL CHARACTERISTICS (VCC = 3.3V ±0.3V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C) Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. CC + 0.3V) Continuous Power Dissipation (TA = +70°C) Operating Temperature Ranges DE = 0V, V CC = 0V or 3.6V DE = 0V, RE= VCC, VCC = 0V or 3.6V, MAX3491 DE = 0V, RE= 0V, VCC = 0V or 3.6V, MAX3491 kΩ12RINReceiver Input Resistance µA±1IOZR Three-State (High Impedance) Output Current at Receiver V0.4VOLReceiver Output Low Voltage VVCC - 0.4VOHReceiver Output High Voltage mV50∆VTHReceiver Input Hysteresis V-0.2 0.2VTH Receiver Differential Threshold Voltage µA-1IO Output Leakage (Y, Z) in Shutdown Mode µA-20IOOutput Leakage (Y, Z) V0.2∆VOD Change in Magnitude of Driver Differential Output Voltage for Complementary Output States (Note 1) V 1.5 VOD 2.0 Differential Driver Output mA-0.8IIN2Input Current (A, B) 1.0 µA±2IIN1Logic Input Current V3VOC Driver Common-Mode Output Voltage V0.2∆VOC Change in Magnitude of Common-Mode Output Voltage (Note 1) V2.0VIHInput High Voltage V0.8VILInput Low Voltage UNITSMIN TYP MAXSYMBOLPARAMETER RL = 54Ω or 100Ω , Figure 4 -7V ≤ VCM ≤ 12V RL = 54Ω (RS-485), Figure 4 VCC = 3.6V, 0V ≤ VOUT ≤ VCC RL = 100Ω (RS-422), Figure 4 IOUT = 2.5mA, VID = 200mV, Figure 6 IOUT = -1.5mA, VID = 200mV, Figure 6 VCM = 0V VOUT = 12V VIN = -7V -7V ≤ VCM ≤ 12V VOUT = -7V VIN = 12V DE, DI, RE RL = 54Ω or 100Ω , Figure 4 RL = 54Ω or 100Ω , Figure 4 DE, DI, RE VOUT = 12V DE, DI, RE VOUT = -7V CONDITIONS RL = 60Ω (RS-485), VCC = 3.3V, Figure 5 1.5 MAX3483/MAX3485/MAX3486/ MAX3488/MAX3490/MAX3491 Maxim Integrated

3.3V-Powered, 10Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers No load, DI = 0V or VCC µA0.002 1ISHDNSupply Current in Shutdown Mode 0.95 1.9 mA 1.1 2.2 ICCSupply Current mA-250IOSD 250 Driver Short-Circuit Output Current mA±8 ±60IOSR Receiver Short-Circuit Output Current UNITSMIN TYP MAXSYMBOLPARAMETER DE = 0V, RE= VCC, DI = VCC or 0V DE = 0V, RE = 0V DE = VCC, RE = 0V or VCC VOUT = -7V VOUT = 12V 0V ≤ VRO ≤ VCC CONDITIONS DC ELECTRICAL CHARACTERISTICS (continued) (VCC = 3.3V ±0.3V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C) ns72 23 5tPLHDriver Propagation Delay, Low-to-High Level ns382 5tTD ns12 23 5tDDDriver Differential Output Delay Driver Differential Output Transition Time ns650 900tPSHDriver Output Enable Time from Shutdown to High Level ns650 900tPSLDriver Output Enable Time from Shutdown to Low Level ns40 80tPHZDriver Output Disable Time from High Level ns72 23 5tPHLDriver Propagation Delay, High-to-Low Level ns8tPDS|tPLH - tPHL| Driver Propagation Delay Skew (Note 2) ns45 90tPZLDriver Output Enable Time to Low Level ns45 90tPZHDriver Output Enable Time to High Level UNITSMIN TYP MAXSYMBOLPARAMETER RL = 27Ω , Figure 8 RL = 60Ω , Figure 7 RL = 60Ω , Figure 7 RL = 110Ω , Figure 9 RL = 110Ω , Figure 10 RL = 110Ω , Figure 9 RL = 27Ω , Figure 8 RL = 27Ω , Figure 8 RL = 110Ω , Figure 10 RL = 110Ω , Figure 9 CONDITIONS DRIVER SWITCHING CHARACTERISTICS—MAX3485, MAX3490, and MAX3491 (VCC = 3.3V, TA = +25°C) ns40 80tPLZDriver Output Disable Time from Low Level RL = 110Ω , Figure 10 DRIVER SWITCHING CHARACTERISTICS—MAX3486 (VCC = 3.3V, TA = +25°C) ns45 80tPLZDriver Output Disable Time from Low Level RL = 110Ω , Figure 10 ns20 48 70tPLHDriver Propagation Delay, Low-to-High Level ns15 35 60tTD ns24 48 70tDDDriver Differential Output Delay Driver Differential Output Transition Time ns700 1000tPSHDriver Output Enable Time from Shutdown to High Level ns700 1000tPSLDriver Output Enable Time from Shutdown to Low Level ns45 80tPHZDriver Output Disable Time from High Level ns20 48 70tPHLDriver Propagation Delay, High-to-Low Level ns11tPDS|tPLH - tPHL| Driver Propagation Delay Skew (Note 2) ns55 100tPZLDriver Output Enable Time to Low Level ns55 100tPZHDriver Output Enable Time to High Level UNITSMIN TYP MAXSYMBOLPARAMETER RL = 27Ω , Figure 8 RL = 60Ω , Figure 7 RL = 60Ω , Figure 7 RL = 110Ω , Figure 9 RL = 110Ω , Figure 10 RL = 110Ω , Figure 9 RL = 27Ω , Figure 8 RL = 27Ω , Figure 8 RL = 110Ω , Figure 10 RL = 110Ω , Figure 9 CONDITIONS DRIVER OUTPUT ENABLE/DISABLE TIMES (MAX3485/MAX3491 only) Maxim Integrated MAX3483/MAX3485/MAX3486/ MAX3488/MAX3490/MAX3491

3.3V-Powered, 10Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers DRIVER SWITCHING CHARACTERISTICS—MAX3483 and MAX3488 (VCC = 3.3V, TA = +25°C) ns50 80tPLZDriver Output Disable Time from Low Level RL = 110Ω , Figure 10 ns700 1000 1500tPLHDriver Propagation Delay, Low-to-High Level ns400 700 1200tTD ns600 900 1400tDDDriver Differential Output Delay Driver Differential Output Transition Time µs2.2 3.0tPSHDriver Output Enable Time from Shutdown to High Level µs1.9 2.7tPSLDriver Output Enable Time from Shutdown to Low Level ns50 80tPHZDriver Output Disable Time from High Level ns700 1000 1500tPHLDriver Propagation Delay, High-to-Low Level ns100tPDS|tPLH - tPHL| Driver Propagation Delay Skew (Note 2) ns900 1300tPZLDriver Output Enable Time to Low Level ns600 800tPZHDriver Output Enable Time to High Level UNITSMIN TYP MAXSYMBOLPARAMETER RL = 27Ω , Figure 8 RL = 60Ω , Figure 7 RL = 60Ω , Figure 7 RL = 110Ω , Figure 9 RL = 110Ω , Figure 10 RL = 110Ω , Figure 9 RL = 27Ω , Figure 8 RL = 27Ω , Figure 8 RL = 110Ω , Figure 10 RL = 110Ω , Figure 9 CONDITIONS RECEIVER SWITCHING CHARACTERISTICS (VCC = 3.3V, TA = +25°C) ns25 45tPRLZ Receiver Output Disable Time from Low Level CL = 15pF, Figure 12, MAX3483/MAX3485/MAX3486/MAX3491 only ns25 65 90 ns80 190 300tSHDNTime to Shutdown ns720 1400tPRSH Receiver Output Enable Time from Shutdown to High Level ns720 1400tPRSL Receiver Output Enable Time from Shutdown to Low Level ns25 45tPRHZ Receiver Output Disable Time from High Level ns25 65 90 ns10 ns25 50tPRZL Receiver Output Enable Time to Low Level ns25 50tPRZH Receiver Output Enable Time to High Level UNITSMIN TYP MAXSYMBOLPARAMETER VID = 0V to 3.0V, CL = 15pF, Figure 11 MAX3483/MAX3485/MAX3486/MAX3491 only (Note 3) CL = 15pF, Figure 12, MAX3483/MAX3485/MAX3486/MAX3491 only CL = 15pF, Figure 12, MAX3483/MAX3485/MAX3486/MAX3491 only CL = 15pF, Figure 12, MAX3483/MAX3485/MAX3486/MAX3491 only VID = 0V to 3.0V, CL = 15pF, Figure 11 VID = 0V to 3.0V, CL = 15pF, Figure 11 CL = 15pF, Figure 12, MAX3483/MAX3485/MAX3486/MAX3491 only CL = 15pF, Figure 12, MAX3483/MAX3485/MAX3486/MAX3491 only CONDITIONS 25 75 120tRPLH Receiver Propagation Delay, Low-to-High Level MAX3483/MAX3488 25 75 120tRPHL Receiver Propagation Delay, High-to-Low Level MAX3483/MAX3488 20tRPDS|tPLH - tPHL| Receiver Propagation Delay Skew MAX3483/MAX3488 Note 1: ∆VOD and ∆VOC are the changes in VOD and VOC, respectively, when the DI input changes state. Note 2: Measured on |tPLH (Y) - tPHL (Y)| and |tPLH (Z) - tPHL (Z)|. Note 3: The transceivers are put into shutdown by bringing RE high and DE low. If the inputs are in this state for less than 80ns, the parts are guaranteed not to enter shutdown. If the inputs are in this state for at least 300ns, the parts are guaranteed to have entered shutdown. See Low-Power Shutdown Mode section. DRIVER OUTPUT ENABLE/DISABLE TIMES (MAX3483 only) MAX3483/MAX3485/MAX3486/ MAX3488/MAX3490/MAX3491 Maxim Integrated

3.3V-Powered, 10Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers (VCC = 3.3V, TA = +25°C, unless otherwise noted.) OUTPUT CURRENT vs. RECEIVER OUTPUT LOW VOLTAGE MAX3483-01 OUTPUT LOW VOLTAGE (V) OUTPUT CURRENT (mA) -20 -18 -16 -14 -12 -10 OUTPUT CURRENT vs. RECEIVER OUTPUT HIGH VOLTAGE MAX3483-02 OUTPUT HIGH VOLTAGE (V) OUTPUT CURRENT (mA) 3.00 3.05 3.10 3.15 3.20 3.25 3.30 -40 -20 0 20 40 60 100 80 RECEIVER OUTPUT HIGH VOLTAGE vs. TEMPERATURE MAX3483-03 TEMPERATURE (°C) OUTPUT HIGH VOLTAGE (V) IRO = 1.5mA 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 -40 -20 0 20 40 60 100 80 RECEIVER OUTPUT LOW VOLTAGE vs. TEMPERATURE MAX3483-04 TEMPERATURE (°C) OUTPUT LOW VOLTAGE (V) IRO = 2.5mA 100 125 150 175 0246 8 1 0 1 2 OUTPUT CURRENT vs. DRIVER OUTPUT LOW VOLTAGE MAX3483-07 OUTPUT LOW VOLTAGE (V) OUTPUT CURRENT (mA) 100 DRIVER OUTPUT CURRENT vs. DIFFERENTIAL OUTPUT VOLTAGE MAX3483-05 DIFFERENTIAL OUTPUT VOLTAGE (V) OUTPUT CURRENT (mA) 1.6 1.7 1.8 1.9 2.0 2.1 2.2 2.3 2.4 2.6 2.5 -40 -20 0 20 40 60 100 80 DRIVER DIFFERENTIAL OUTPUT VOLTAGE vs.TEMPERATURE MAX3483-06 TEMPERATURE (°C) DIFFERENTIAL OUTPUT VOLTAGE (V) R = 54Ω -100 -80 -60 -40 -20 5 4 3 2 1 0-7 -6 -3 -4 -5 -2 -1 OUTPUT CURRENT vs. DRIVER OUTPUT HIGH VOLTAGE MAX3483-08 OUTPUT HIGH VOLTAGE (V) OUTPUT CURRENT (mA) Maxim Integrated MAX3483/MAX3485/MAX3486/ MAX3488/MAX3490/MAX3491

3.3V-Powered, 10Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers 0.8 0.7 0.9 1.0 1.1 1.2 -40 -20 0 20 40 60 100 80 SUPPLY CURRENT vs. TEMPERATURE MAX3483-09 TEMPERATURE (°C) SUPPLY CURRENT (mA) X = DON’T CARE DE = VCC, RE = X DE = 0, RE = 0 100 -40 -20 0 20 40 60 100 80 SHUTDOWN CURRENT vs. TEMPERATURE MAX3483-10 TEMPERATURE (°C) SHUTDOWN CURRENT (nA) MAX3483/ MAX3485/ MAX3486 2 Receiver Output. If A > B by 200mV, RO will be high; if A < B by 200mV, RO will be low. Receiver Output Enable. RO is enabled when REis low; RO is high imped- ance when REis high. If RE is high and DE is low, the device will enter a low-power shutdown mode. Driver Output Enable. The driver outputs are enabled by bringing DE high. They are high impedance when DE is low. If RE is high and DE is low, the device will enter a low-power shutdown mode. If the driver outputs are enabled, the parts function as line drivers. While they are high impedance, they function as line receivers if RE is low. 5 Driver Input. A low on DI forces output Y low and output Z high. Similarly, a high on DI forces output Y high and output Z low. 6, 7 Ground

9 Noninverting Driver Output

10 Inverting Driver Output

— Noninverting Receiver Input and Noninverting Driver Output

12 Noninverting Receiver Input

–RE DE DI GND Y Z A A — B Inverting Receiver Input and Inverting Driver Output

11 B Inverting Receiver Input

13, 14 VCC Positive Supply: 3.0V ≤ VCC ≤ 3.6V 1, 8 N.C. No Connect—not internally connected MAX3488/ MAX3490 PIN FUNCTION MAX3491 FUNCTIONNAMENAME MAX3483/MAX3485/MAX3486/ MAX3488/MAX3490/MAX3491 Maxim Integrated

TRANSISTOR COUNT: 810 SUBSTRATE CONNECTED TO GROUND PART MAX3486CPA MAX3486CSA MAX3486C/D 0°C to +70°C 0°C to +70°C 0°C to +70°C TEMP. RANGE PIN-PACKAGE Dice* MAX3486EPA MAX3486ESA -40°C to +85°C -40°C to +85°C 8 Plastic DIP 8 SO MAX3488CPA MAX3488CSA MAX3488C/D 0°C to +70°C 0°C to +70°C 0°C to +70°C 8 Plastic DIP 8 SO Dice* MAX3488EPA MAX3488ESA -40°C to +85°C -40°C to +85°C 8 Plastic DIP 8 SO MAX3490CPA MAX3490CSA MAX3490C/D 0°C to +70°C 0°C to +70°C 0°C to +70°C 8 Plastic DIP 8 SO Dice* MAX3490EPA MAX3490ESA -40°C to +85°C -40°C to +85°C 8 Plastic DIP 8 SO MAX3491CPD MAX3491CSD MAX3491C/D 0°C to +70°C 0°C to +70°C 0°C to +70°C 14 Plastic DIP 14 SO Dice* MAX3491EPD MAX3491ESD -40°C to +85°C -40°C to +85°C 14 Plastic DIP 14 SO * Contact factory for for dice specifications. 0.146" (3.71mm) 0.086" (2.18mm) Z/B B A Y/A GND DI DE RE RO VCC GND Maxim Integrated MAX3483/MAX3485/MAX3486/ MAX3488/MAX3490/MAX3491 3.3V-Powered, 10Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers

3.3V-Powered, 10Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers DIM A B C E e H L MIN 0.053 0.004 0.014 0.007 0.150 0.228 0.016 MAX 0.069 0.010 0.019 0.010 0.157 0.244 0.050 MIN 1.35 0.10 0.35 0.19 3.80 5.80 0.40 MAX 1.75 0.25 0.49 0.25 4.00 6.20 1.27 INCHES MILLIMETERS 21-0041A SO SMALL OUTLINE PACKAGE (0.150 in.) DIM D D D MIN 0.189 0.337 0.386 MAX 0.197 0.344 0.394 MIN 4.80 8.55 9.80 MAX 5.00 8.75 10.00 INCHES MILLIMETERSPINS 1.270.050 L 0°-8° HE D e A A1 C 0.101mm 0.004in. B DIM A B C E e eA eB L MIN 0.015 0.125 0.055 0.016 0.045 0.008 0.005 0.300 0.240 0.100 0.300 0.115 MAX 0.200 0.175 0.080 0.022 0.065 0.012 0.080 0.325 0.310 0.400 0.150 MIN 0.38 3.18 1.40 0.41 1.14 0.20 0.13 7.62 6.10 2.54 7.62 2.92 MAX 5.08 4.45 2.03 0.56 1.65 0.30 2.03 8.26 7.87 10.16 3.81 INCHES MILLIMETERS Plastic DIP PLASTIC DUAL-IN-LINE PACKAGE (0.300 in.) DIM D D D D D D MIN 0.348 0.735 0.745 0.885 1.015 1.14 MAX 0.390 0.765 0.765 0.915 1.045 1.265 MIN 8.84 18.67 18.92 22.48 25.78 28.96 MAX 9.91 19.43 19.43 23.24 26.54 32.13 INCHES MILLIMETERSPINS C A A2 E1D E eA eB B 0° - 15°A1L e MAX3483/MAX3485/MAX3486/ MAX3488/MAX3490/MAX3491 Maxim Integrated

3.3V-Powered, 10Mbps and Slew-Rate-Limited True RS-485/RS-422 Transceivers Maxim Integrated 160 Rio Robles, San Jose, CA 95134 USA 1-408-601-1000 Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. © 1994 Maxim Integrated The Maxim logo and Maxim Integrated are trademarks of Maxim Integrated Products, Inc.