Multiprotocol transceiver simplifies industrial designs
The XR3450 is the latest addition to Exar’s family of single-chip RS-232/RS-485/RS-422 serial transceivers. It features a ±10V RS-232 driver output that supports a wider range of RS-232 peripherals and includes integrated cable termination and four configuration modes that allow all three protocols to be used interchangeably over a single cable or connector with no additional switching components. The RS-232 mode provides three drivers and five receivers to support all eight signals required for the DB9 serial port (3TX/5RX), while RS-485/422 modes include both half and full duplex (1TX/1RX).
The XR34350 operates from either a 3.3V or 5V supply, consumes 2mA typical supply current, and offers a shutdown mode for low power (10µA) standby operation. The high speed drivers operate up to 20Mbps in RS-485/422 modes, and up to 1Mbps in RS-232 mode. All drivers can be slew limited to 250kbps in any mode to minimize electromagnetic interference (EMI).
All bus pins are protected against severe ESD events up to ±15kV HBM (Human Body Model), ±15kV IEC-61000-4-2 Air Gap, and ±8kV IEC 61000-4-2 Contact Discharge.