Features: For Fault-Tolerant Applications
MAX3430: ±80V Fault-Protected, Fail-Safe, 1/4 Unit Load, +3.3V, RS-485 Transceiver
MAX3440EMAX3444E: ±15kV ESD-Protected,±60V Fault-Protected, 10Mbps, Fail-Safe,RS-485/J1708 Transceivers
For Space-Constrained Applications
MAX3460MAX3464: +5V, Fail-Safe, 20Mbps, Profibus RS-485/RS-422 Transceivers
MAX3362: +3.3V, High-Speed, RS-485/RS-422 Transceiver in a SOT23 Package
MAX3280EMAX3284E: ±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-855/RS-422 Transmitters
For Multiple Transceiver Applications
MAX3030EMAX3033E: ±15kV ESD-Protected, +3.3V, Quad RS-422 Transmitters
For Fail-Safe Applications
MAX3080MAX3089: Fail-Safe, High-Speed (10Mbps), Slew-Rate-Limited RS-485/RS-422 Transceivers
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
ApplicationLow-Power RS-485 Transceivers
Low-Power RS-422 Transceivers
Level Translators
Transceivers for EMI-Sensitive Applications
Industrial-Control Local Area NetworksPinout
SpecificationsSupply Voltage (VCC) ...........................................................12V
Control Input Voltage (RE, DE)...................-0.5V to (VCC + 0.5V)
Driver Input Voltage (DI)............................-0.5V to (VCC + 0.5V)
Driver Output Voltage (A, B)..................................-8V to +12.5V
Receiver Input Voltage (A, B).................................-8V to +12.5V
Receiver Output Voltage (RO)......................-0.5V to (VCC +0.5V)
Continuous Power Dissipation (TA = +70°C)
8-Pin Plastic DIP (derate 9.09mW/°C above +70°C) ....727mW
14-Pin Plastic DIP (derate 10.00mW/°C above +70°C) 800mW
14-Pin SO (derate 8.33mW/°C above +70°C)...............667mW
8-Pin µMAX (derate 4.1mW/°C above +70°C) ..............830mW
8-Pin CERDIP (derate 8.00mW/°C above +70°C)..........640mW
14-Pin CERDIP (derate 9.09mW/°C above +70°C)........727mW
Operating Temperature Ranges
MAX4_ _C_ _/MAX1487C_ A ................................0°C to +70°C
MAX4_ _E_ _/MAX1487E_ A..............................-40°C to +85°C
MAX4_ _MJ_/MAX1487MJA ..............................-55°C to +125°C
Storage Temperature Range ..........................-65°C to +160°C
Lead Temperature (soldering, 10sec) ............................+300°C
8-Pin SO (derate 5.88mW/°C above +70°C)..................471mWDescriptionThe MAX481, MAX483, MAX485, MAX487MAX491, and MAX1487 are low-power transceivers for RS-485 and RS- 422 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 of MAX491 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 of MAX491 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 MAX488MAX491, while the MAX481, MAX483, MAX485, MAX487, and MAX1487 are designed for half-duplex applications.
MAX491 Data Sheet
