±80V Fault-Protected, Full-Duplex RS-485 Transceiver

The MAX13448E full-duplex RS-485 transceiver features inputs and outputs fault protected up to ±80V (with respect to ground). The device operates from a +3.0V to +5.5V supply and features true fail-safe circuitry, guaranteeing a logic-high receiver output when the receiver inputs are open or shorted. This enables all receiver outputs on a terminated bus to output logic-high when all transmitters are disabled.

The MAX13448E features a slew-rate limited driver that minimizes EMI and reduces reflections caused by improperly terminated cables, allowing error-free data transmission at data rates up to 500kbps with a +5V supply, and 250kbps with a +3.3V supply.

The MAX13448E includes a hot-swap capability to eliminate false transitions on the bus during power-up or hot insertion. The driver and receiver feature active-high and active-low enables, respectively, that can be connected together externally to serve as a direction control.

The MAX13448E features an 1/8-unit load receiver input impedance, allowing up to 256 transceivers on the bus. All driver outputs are protected to ±8kV ESD using the Human Body Model. The MAX13448E is available in a 14-pin SO package and operates over the extended -40°C to +85°C temperature range.

Applications

* HVAC Control Systems * Industrial Control Systems * Motor Driver Control Systems * Utility Meters

* ±80V Fault Protection on the RS-485 I/O Ports

* True Fail-Safe Receiver

* Hot-Swap Input Structure on DE

* ESD Protection on the RS-485 I/O Ports ±8kV Human Body Model

* Slew-Rate Limiting Facilitates Error-Free Data Transmission

* 1/8-Unit Load Allows Up to 256 Transceivers on the Bus

* -7V to +12V Common-Mode Input Voltage Range

* +3.0V to +5.5V Operating Supply Voltage

* Available in 14-Pin SO Package