The MAX481, MAX483, MAX485, MAX487–MAX491, andMAX1487 are low-power transceivers for RS-485 and RS-422 communication. Each part containsMAX485ESAone driver and onereceiver. The MAX483, MAX487, MAX488, and MAX489feature reduced slew-rate drivers that minimize EMI andreduce 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 MAX485ESAare not limited, allowing them totransmit up to 2.5Mbps.
These transceivers draw between 120μA and 500μA ofsupply current when unloaded or fully loaded with disableddrivers. Additionally, the MAX481, MAX483, and MAX487have a low-current shutdown mode inwhichtheyconsumeonly0.1μA. All parts operate from a single 5V supply.Drivers are short-circuit current limited and are protectedagainst excessivepowerMAX485ESAdissipation by thermal shutdowncircuitry that places the driver outputs into a high-impedancestate. The receiver input has a fail-safe feature thatguarantees a logic-high output if the input is open circuit.
The MAX487 and MAX1487 feature quarter-unit-loadreceiver input impedance, allowing up to 128 MAX487/MAX1487 transceivers on the bus. Full-duplex communicationsare obtainedMAX485ESAusing the MAX488–MAX491, whilethe MAX481, MAX483, MAX485, MAX487, and MAX1487are designed for half-duplex applications.
Next Generation Device Features
For Fault-Tolerant ApplicationsMAX3430: ±80V Fault-Protected, Fail-Safe, 1/4Unit Load, +3.3V, RS-485 Transceiver
MAX3440E–MAX3444E: ±15kV ESD-Protected,±60V Fault-Protected, 10Mbps, Fail-Safe,RS485/J1708TransceiversFor Space-Constrained ApplicationsMAX3460–MAX3464: +5V, Fail-Safe, 20Mbps,Profibus RS485/RS422TranscMAX485ESAeiversMAX3362: +3.3V, High-Speed, RS-485/RS-422Transceiver in a SOT23 PackageMAX3280E–MAX3284E: ±15kV ESD-Protected,52Mbps, +3V to +5.5V, SOT23, RS-485/RS-422,True Fail-SafeReceiversMAX3293/MAX3294/MAX3295: 20Mbps, +3.3V,SOT23, RS-855/RS-422 Transmitters
For Multiple Transceiver ApplicationsMAX3030E–MAX3033E: ±15kV ESD-Protected,+3.3V, Quad RS-422 Transmitters
For Fail-Safe ApplicationsMAX3080–MAX3089: Fail-Safe, High-Speed(10Mbps), Slew-Rate-Limited RS-485/RS-422Transceivers
版权所有