19-0122; Rev 8; 10/03

Low-Power, Slew-Rate-LimitedRS-485/RS-422 Transceivers


General Description

__Next Generation Device Features

The MAX481, MAX483, MAX485, MAX487–MAX491, andMAX1487 are low-power transceivers for RS-485 and RS- For Fault-Tolerant Applications

422 communication. Each part contains one driver and oneMAX3430: ±80V Fault-Protected, Fail-Safe, 1/4receiver. The MAX483, MAX487, MAX488, and MAX489Unit Load, +3.3V, RS-485 Transceiver

feature reduced slew-rate drivers that minimize EMI andMAX3440E–MAX3444E: ±15kV ESD-Protected,reduce reflections caused by improperly terminated cables,±60V Fault-Protected, 10Mbps, Fail-Safe, thus allowing error-free data transmission up to 250kbps.The driver slew rates of the MAX481, MAX485, MAX490,RS-485/J1708 Transceivers

MAX491, and MAX1487 are not limited, allowing them to For Space-Constrained Applications

transmit up to 2.5Mbps.

MAX3460–MAX3464: +5V, Fail-Safe, 20Mbps,These transceivers draw between 120µA and 500µA ofProfibus RS-485/RS-422 Transceivers

supply current when unloaded or fully loaded with disabledMAX3362: +3.3V, High-Speed, RS-485/RS-422drivers. Additionally, the MAX481, MAX483, and MAX487Transceiver in a SOT23 Package

have a low-current shutdown mode in which they consumeMAX3280E–MAX3284E: ±15kV ESD-Protected,only 0.1µA. 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 protectedTrue Fail-Safe Receivers

against excessive power dissipation by thermal shutdowncircuitry that places the driver outputs into a high-imped-MAX3293/MAX3294/MAX3295: 20Mbps, +3.3V,ance state. The receiver input has a fail-safe feature thatSOT23, RS-855/RS-422 Transmittersguarantees a logic-high output if the input is open circuit. For Multiple Transceiver Applications

The MAX487 and MAX1487 feature quarter-unit-loadMAX3030E–MAX3033E: ±15kV ESD-Protected,receiver input impedance, allowing up to 128 MAX487/+3.3V, Quad RS-422 TransmittersMAX1487 transceivers on the bus. Full-duplex communi- For Fail-Safe Applications

cations are obtained using the MAX488–MAX491, whilethe MAX481, MAX483, MAX485, MAX487, and MAX1487MAX3080–MAX3089: Fail-Safe, High-Speedare designed for half-duplex applications.

(10Mbps), Slew-Rate-Limited RS-485/RS-422Transceivers


For Low-Voltage Applications

Low-Power RS-485 TransceiversMAX3483E/MAX3485E/MAX3486E/MAX3488E/Low-Power RS-422 TransceiversMAX3490E/MAX3491E: +3.3V Powered, ±15kVLevel Translators

ESD-Protected, 12Mbps, Slew-Rate-Limited,True RS-485/RS-422 Transceivers

Transceivers for EMI-Sensitive ApplicationsIndustrial-Control Local Area Networks

Ordering Information appears at end of data sheet.

______________________________________________________________Selection Table

For pricing, delivery, and ordering information,please contact Maxim/Dallas Direct!at 1-888-629-4642, or visit Maxim’s website at


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