MAX481/MAX483/MAX485/ MAX487MAX491/MAX1487 Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers General Description Next Generation Device Features The MAX481, MAX483, MAX485, MAX487MAX491, and For Fault-Tolerant Applications MAX1487 are low-power transceivers for RS-485 and RS- MAX3430: 80V Fault-Protected, Fail-Safe, 1/4 422 communication. Each part contains one driver and one Unit Load, +3.3V, RS-485 Transceiver receiver. The MAX483, MAX487, MAX488, and MAX489 MAX3440EMAX3444E: 15kV ESD-Protected, feature reduced slew-rate drivers that minimize EMI and 60V Fault-Protected, 10Mbps, Fail-Safe, reduce reflections caused by improperly terminated cables, thus allowing error-free data transmission up to 250kbps. RS-485/J1708 Transceivers The driver slew rates of the MAX481, MAX485, MAX490, For Space-Constrained Applications MAX491, and MAX1487 are not limited, allowing them to MAX3460MAX3464: +5V, Fail-Safe, 20Mbps, transmit up to 2.5Mbps. Profibus RS-485/RS-422 Transceivers These transceivers draw between 120A and 500A of MAX3362: +3.3V, High-Speed, RS-485/RS-422 supply current when unloaded or fully loaded with disabled Transceiver in a SOT23 Package drivers. Additionally, the MAX481, MAX483, and MAX487 have a low-current shutdown mode in which they consume MAX3280EMAX3284E: 15kV ESD-Protected, only 0.1A. All parts operate from a single 5V supply. 52Mbps, +3V to +5.5V, SOT23, RS-485/RS-422, Drivers are short-circuit current limited and are protected True Fail-Safe Receivers against excessive power dissipation by thermal shutdown MAX3293/MAX3294/MAX3295: 20Mbps, +3.3V, circuitry that places the driver outputs into a high-imped- SOT23, RS-485/RS-422 Transmitters ance state. The receiver input has a fail-safe feature that For Multiple Transceiver Applications guarantees a logic-high output if the input is open circuit. MAX3030EMAX3033E: 15kV ESD-Protected, The MAX487 and MAX1487 feature quarter-unit-load +3.3V, Quad RS-422 Transmitters receiver input impedance, allowing up to 128 MAX487/ MAX1487 transceivers on the bus. Full-duplex communi- For Fail-Safe Applications cations are obtained using the MAX488MAX491, while MAX3080MAX3089: Fail-Safe, High-Speed the MAX481, MAX483, MAX485, MAX487, and MAX1487 (10Mbps), Slew-Rate-Limited RS-485/RS-422 are designed for half-duplex applications. Transceivers Applications For Low-Voltage Applications MAX3483E/MAX3485E/MAX3486E/MAX3488E/ Low-Power RS-485 Transceivers MAX3490E/MAX3491E: +3.3V Powered, 15kV Low-Power RS-422 Transceivers ESD-Protected, 12Mbps, Slew-Rate-Limited, Level Translators True RS-485/RS-422 Transceivers Transceivers for EMI-Sensitive Applications Industrial-Control Local Area Networks Ordering Information appears at end of data sheet. Selection Table DATA LOW- RECEIVER/ QUIESCENT NUMBER OF PART HALF/FULL SLEW-RATE PIN RATE POWER DRIVER CURRENT RECEIVERS ON NUMBER DUPLEX LIMITED COUNT (Mbps) SHUTDOWN ENABLE (A) BUS MAX481 Half 2.5 No Yes Yes 300 32 8 MAX483 Half 0.25 Yes Yes Yes 120 32 8 MAX485 Half 2.5 No No Yes 300 32 8 MAX487 Half 0.25 Yes Yes Yes 120 128 8 MAX488 Full 0.25 Yes No No 120 32 8 MAX489 Full 0.25 Yes No Yes 120 32 14 MAX490 Full 2.5 No No No 300 32 8 MAX491 Full 2.5 No No Yes 300 32 14 MAX1487 Half 2.5 No No Yes 230 128 8 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrateds website at www.maximintegrated.com. 19-0122 Rev 10 9/14MAX481/MAX483/MAX485/ MAX487MAX491/MAX1487 Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers ABSOLUTE MAXIMUM RATINGS Supply Voltage (V ).............................................................12V 14-Pin SO (derate 8.33mW/C above +70C)...............667mW CC Control Input Voltage (RE, DE)...................-0.5V to (V + 0.5V) 8-Pin MAX (derate 4.1mW/C above +70C) ..............830mW CC Driver Input Voltage (DI).............................-0.5V to (V + 0.5V) 8-Pin CERDIP (derate 8.00mW/C above +70C).........640mW CC Driver Output Voltage (A, B)...................................-8V to +12.5V 14-Pin CERDIP (derate 9.09mW/C above +70C).......727mW Receiver Input Voltage (A, B).................................-8V to +12.5V Operating Temperature Ranges Receiver Output Voltage (RO)....................-0.5V to (V + 0.5V) MAX4 C /MAX1487C A ...............................0C to +70C CC Continuous Power Dissipation (T = +70C) MAX4 E /MAX1487E A.............................-40C to +85C A 8-Pin Plastic DIP (derate 9.09mW/C above +70C) ....727mW MAX4 M /MAX1487MJA .............................-55C to +125C 14-Pin Plastic DIP (derate 10.00mW/C above +70C) ..800mW Storage Temperature Range .............................-65C to +160C 8-Pin SO (derate 5.88mW/C above +70C).................471mW Lead Temperature (soldering, 10sec) .............................+300C 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. DC ELECTRICAL CHARACTERISTICS (V = 5V 5%, T = T to T , unless otherwise noted.) (Notes 1, 2) CC A MIN MAX PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Differential Driver Output (no load) V 5 V OD1 R = 50 (RS-422) 2 Differential Driver Output V V OD2 (with load) R = 27 (RS-485), Figure 4 1.5 5 Change in Magnitude of Driver Differential Output Voltage for V R = 27 or 50 , Figure 4 0.2 V OD Complementary Output States Driver Common-Mode Output V R = 27 or 50 , Figure 4 3 V OC Voltage Change in Magnitude of Driver Common-Mode Output Voltage V R = 27 or 50 , Figure 4 0.2 V OD for Complementary Output States Input High Voltage V DE, DI, RE 2.0 V IH Input Low Voltage V DE, DI, RE 0.8 V IL Input Current I 2 A IN1 DE, DI, RE DE = 0V V = 12V 1.0 IN V = 0V or 5.25V, CC mA all devices except Input Current V = -7V -0.8 IN I IN2 MAX487/MAX1487 (A, B) V = 12V 0.25 MAX487/MAX1487, IN mA DE = 0V, V = 0V or 5.25V CC V = -7V -0.2 IN Receiver Differential Threshold V -7V V 12V -0.2 0.2 V TH CM Voltage Receiver Input Hysteresis V V = 0V 70 mV TH CM Receiver Output High Voltage V I = -4mA, V = 200mV 3.5 V OH O ID Receiver Output Low Voltage V I = 4mA, V = -200mV 0.4 V OL O ID Three-State (high impedance) I 0.4V V 2.4V 1 A OZR O Output Current at Receiver -7V V 12V, all devices except CM 12 k MAX487/MAX1487 Receiver Input Resistance R IN -7V V 12V, MAX487/MAX1487 48 k CM 2 Maxim Integrated