2.75kV Isolated 500kbps/25Mbps Full-Duplex RS-485/RS-422 Transceivers with ±35kV ESD Protection

The MAX14852/MAX14854 isolated RS-485/RS-422 transceivers provide 2750VRMS (60s) of galvanic isolation between the cable side (RS-485/RS-422 driver/receiver side) and the UART side of the device. Isolation improves communication by breaking ground loops and reduces noise when there are large differences in ground potential between ports. These devices allow for robust communication up to 500kbps (MAX14852) or 25Mbps (MAX14854).

The devices include one drive channel and one receive channel. The receiver is 1/4-unit load, allowing up to 128 transceivers on a common bus.

Integrated true fail-safe circuitry ensures a logic-high on the receiver output when inputs are shorted or open. Undervoltage lockout disables the driver when cable side or UART side power supplies are below functional levels.

The driver outputs and receiver inputs are protected from ±35kV electrostatic discharge (ESD) to GNDB on the cable side, as specified by the Human Body Model (HBM).

The MAX14852/MAX14854 are available in a wide-body 16-pin SOIC package and operate over the -40°C to +105°C temperature range.

Applications

* HVAC * Industrial Automation Equipment * Power Meters * Programmable Logic Controllers

* High-Performance Transceiver Enables Flexible Designs

* Integrated LDO for Cable Side Power

* Compliant with RS-485 EIA/TIA-485 Standard

* 500kbps (MAX14852)/25Mbps (MAX14854) Maximum Data Rate

* Allows Up to 128 Devices on the Bus

* Integrated Protection Ensures for Robust Communication

* ±35kV ESD (HBM) on Driver Outputs/Receiver Inputs

* 2.75kVRMS Withstand Isolation Voltage for 60 Seconds (VISO)

* 630VPEAK Maximum Repetitive Peak-Isolation Voltage (VIORM)

* 445VRMS Maximum Working-Isolation Voltage (VIOWM)

* > 30 Years Lifetime at Rated Working Voltage

* Withstands ±10kV Surge per IEC 61000-4-5

* Thermal Shutdown