MAX481/MAX483/MAX485/ MAX487–MAX491/MAX1487 Low-Power, Slew-Rate-Limited RS-485/RS-422 Transceivers General Description The MAX481, MAX483, MAX485, MAX487–MAX491, and MAX1487 are low-power transceivers for RS-485 and RS422 communication. Each part contains one driver and one receiver. The MAX483, MAX487, MAX488, and MAX489 feature reduced slew-rate drivers that minimize EMI and reduce reflections caused by improperly terminated cables, thus allowing error-free data transmission up to 250kbps. The driver slew rates of the MAX481, MAX485, MAX490, MAX491, and MAX1487 are not limited, allowing them to transmit up to 2.5Mbps. These transceivers draw between 120µA and 500µA of supply current when unloaded or fully loaded with disabled drivers. Additionally, the MAX481, MAX483, and MAX487 have a low-current shutdown mode in which they consume only 0.1µA. All parts operate from a single 5V supply. Drivers are short-circuit current limited and are protected 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 the input is open circuit. The MAX487 and MAX1487 feature quarter-unit-load receiver input impedance, allowing up to 128 MAX487/ MAX1487 transceivers on the bus. Full-duplex communications are obtained using the MAX488–MAX491, while the MAX481, MAX483, MAX485, MAX487, and MAX1487 are designed for half-duplex applications. ________________________Applications Low-Power RS-485 Transceivers Low-Power RS-422 Transceivers Level Translators __Next Generation Device Features o For Fault-Tolerant Applications MAX3430: ±80V Fault-Protected, Fail-Safe, 1/4 Unit Load, +3.3V, RS-485 Transceiver MAX3440E–MAX3444E: ±15kV ESD-Protected, ±60V Fault-Protected, 10Mbps, Fail-Safe, RS-485/J1708 Transceivers o For Space-Constrained Applications MAX3460–MAX3464: +5V, Fail-Safe, 20Mbps, Profibus RS-485/RS-422 Transceivers MAX3362: +3.3V, High-Speed, RS-485/RS-422 Transceiver in a SOT23 Package MAX3280E–MAX3284E: ±15kV ESD-Protected, 52Mbps, +3V to +5.5V, SOT23, RS-485/RS-422, True Fail-Safe Receivers MAX3293/MAX3294/MAX3295: 20Mbps, +3.3V, SOT23, RS-485/RS-422 Transmitters o For Multiple Transceiver Applications MAX3030E–MAX3033E: ±15kV ESD-Protected, +3.3V, Quad RS-422 Transmitters o For Fail-Safe Applications MAX3080–MAX3089: Fail-Safe, High-Speed (10Mbps), Slew-Rate-Limited RS-485/RS-422 Transceivers o For Low-Voltage Applications MAX3483E/MAX3485E/MAX3486E/MAX3488E/ MAX3490E/MAX3491E: +3.3V Powered, ±15kV ESD-Protected, 12Mbps, Slew-Rate-Limited, 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 RATE (Mbps) LOWRECEIVER/ QUIESCENT POWER DRIVER CURRENT SHUTDOWN ENABLE (μA) NUMBER OF RECEIVERS ON BUS PART NUMBER HALF/FULL DUPLEX 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 SLEW-RATE LIMITED For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated’s website at www.maximintegrated.com. PIN COUNT 19-0122; Rev 10; 9/14




Maxim Integrated




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