MAX481E/MAX483E/MAX485E/ MAX487EMAX491E/MAX1487E 15kV ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 Transceivers General Description Next-Generation Device Features The MAX481E, MAX483E, MAX485E, MAX487E For Fault-Tolerant Applications: MAX491E, and MAX1487E are low-power transceivers for MAX3430: 80V Fault-Protected, Fail-Safe, 1/4- RS-485 and RS-422 communications in harsh environ- Unit Load, +3.3V, RS-485 Transceiver ments. Each driver output and receiver input is protected MAX3080MAX3089: Fail-Safe, High-Speed against 15kV electro-static discharge (ESD) shocks, (10Mbps), Slew-Rate-Limited, RS-485/RS-422 without latchup. These parts contain one driver and one Transceivers receiver. The MAX483E, MAX487E, MAX488E, and MAX489E feature reduced slew-rate drivers that minimize For Space-Constrained Applications: EMI and reduce reflections caused by improperly termi- MAX3460MAX3464: +5V, Fail-Safe, 20Mbps, nated cables, thus allowing error-free data transmission Profibus, RS-485/RS-422 Transceivers up to 250kbps. The driver slew rates of the MAX481E, MAX3362: +3.3V, High-Speed, RS-485/RS-422 MAX485E, MAX490E, MAX491E, and MAX1487E are not Transceiver in a SOT23 Package limited, allowing them to transmit up to 2.5Mbps. MAX3280EMAX3284E: 15kV ESD-Protected, These transceivers draw as little as 120A supply cur- 52Mbps, +3V to +5.5V, SOT23, RS-485/RS-422 rent when unloaded or when fully loaded with disabled True Fail-Safe Receivers drivers (see Selector Guide). Additionally, the MAX481E, MAX3030EMAX3033E: 15kV ESD-Protected, MAX483E, and MAX487E have a low-current shutdown +3.3V, Quad RS-422 Transmitters mode in which they consume only 0.5A. All parts oper- For Multiple Transceiver Applications: ate from a single +5V supply. MAX3293/MAX3294/MAX3295: 20Mbps, +3.3V, Drivers are short-circuit current limited, and are protected SOT23, RS-485/RS-422 Transmitters against excessive power dissipation by thermal shutdown circuitry that places their outputs into a high-impedance For Fail-Safe Applications: state. The receiver input has a fail-safe feature that guar- MAX3440EMAX3444E: 15kV ESD-Protected, antees a logic-high output if the input is open circuit. 60V Fault-Protected, 10Mbps, Fail-Safe The MAX487E and MAX1487E feature quarter-unit-load RS-485/J1708 Transceivers receiver input impedance, allowing up to 128 trans- For Low-Voltage Applications: ceivers on the bus. The MAX488EMAX491E are MAX3483E/MAX3485E/MAX3486E/MAX3488E/ designed for full-duplex communications, while the Functional Diagrams MAX3490E/MAX3491E: +3.3V Powered, 15kV MAX481E, MAX483E, MAX485E, MAX487E, and ESD-Protected, 12Mbps, Slew-Rate-Limited, MAX1487E are designed for half-duplex applications. True RS-485/RS-422 Transceivers For applications that are not ESD sensitive see the pin- and function-compatible MAX481, MAX483, MAX485, MAX487MAX491, and MAX1487. Ordering Information Applications PART TEMP RANGE PIN-PACKAGE Low-Power RS-485 Transceivers MAX481ECPA 0C to +70C 8 Plastic DIP Low-Power RS-422 Transceivers MAX481ECSA 0C to +70C 8 SO Level Translators MAX481EEPA -40C to +85C 8 Plastic DIP Transceivers for EMI-Sensitive Applications MAX481EESA -40C to +85C 8 SO Industrial-Control Local Area Networks MAX483ECPA 0C to +70C 8 Plastic DIP MAX483ECSA 0C to +70C 8 SO MAX483EEPA -40C to +85C 8 Plastic DIP MAX483EESA -40C to +85C 8 SO Pin Configurations appear at end of data sheet. Ordering Information continued at end of data sheet. Functional Diagrams continued at end of data sheet. Selector Guide appears 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 Maxims website at www.maxim integrated.com. 19-0410 Rev 4 10/03 Ordering Information AVAILABLEMAX481E/MAX483E/MAX485E/ MAX487EMAX491E/MAX1487E 15kV ESD-Protected, Slew-Rate-Limited, Low-Power, RS-485/RS-422 Transceivers ABSOLUTE MAXIMUM RATINGS Supply Voltage (V ).............................................................12V 14-Pin Plastic DIP (derate 10.00mW/C above +70C) ..800mW CC Control Input Voltage (RE, DE)...................-0.5V to (V + 0.5V) 8-Pin SO (derate 5.88mW/C above +70C).................471mW CC Driver Input Voltage (DI).............................-0.5V to (V + 0.5V) 14-Pin SO (derate 8.33mW/C above +70C)...............667mW CC Driver Output Voltage (Y, Z A, B) ..........................-8V to +12.5V Operating Temperature Ranges Receiver Input Voltage (A, B).................................-8V to +12.5V MAX4 C /MAX1487EC A .............................0C to +70C Receiver Output Voltage (RO)....................-0.5V to (V + 0.5V) MAX4 E /MAX1487EE A...........................-40C to +85C CC Continuous Power Dissipation (T = +70C) Storage Temperature Range .............................-65C to +160C A 8-Pin Plastic DIP (derate 9.09mW/C above +70C) ....727mW 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 8 1.5 5 Change in Magnitude of Driver Differential Output Voltage for V R = 27 or 50, Figure 8 0.2 V OD Complementary Output States Driver Common-Mode Output V R = 27 or 50, Figure 8 3 V OC Voltage Change in Magnitude of Driver Common-Mode Output Voltage V R = 27 or 50, Figure 8 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 DE, DI, RE 2 A IN1 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 MAX487E/MAX1487E (A, B) V = 12V 0.25 IN MAX487E/MAX1487E, 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 MAX487E/MAX1487E Receiver Input Resistance R IN -7V V 12V, MAX487E/MAX1487E 48 k CM 2 Maxim Integrated