Description

The MAX14945 isolated RS-485/RS-422 transceiver provides2750VRMS (60s) of galvanic isolation between the cableside (RS-485/RS-422 driver/receiver side) and the UARTside of the device. Isolation improves communication bybreaking ground loops and reduces noise when thereare large differences in ground potential between ports.Signals are passed across the isolation barrier throughintegrated high-voltage capacitors. This device allows forrobust communication at any speed up to 500kbps.The device includes one half-duplex drive/receive channel.The receiver is 1/8-unit load, allowing up to 256 transceiverson a common bus.Integrated true fail-safe circuitry ensures a logic-high on thereceiver output when inputs are shorted or open. Undervoltagelockout disables the driver when the cable side or UART sidepower supplies are below functional levels.The driver outputs/receiver inputs are protected from±30kV electrostatic discharge (ESD) to GNDB on thecable side, as specified by the Human Body Model (HBM).The MAX14945 is available in a wide body 16-pinSO package and operates over the -40°C to +85°Ctemperature range.ApplicationsHVACIndustrial Automation EquipmentPower MetersProgrammable Logic Controllers