HGX3491AEIM/TR

HGX3491A is a +3.3V powered RS-485/RS-422 transceiver with ±16kV ESD protection. It features a failsafe circuit that drives the receiver output to a logic high when the receiver inputs are open or shorted, or when all transmitters connected to a terminated bus are disabled. The entire product family supports hot-swap capability, eliminating bus fault transients during power-up or hot insertion. The HGX3491A driver features an unlimited slew rate, enabling data rates up to 16Mbps. The HGX3491A is designed for full-duplex communication. All devices feature 1/8 unit load receiver input impedance, allowing up to 256 transceivers to be connected on the bus. The HGX3491A high-speed RS-485/RS-422 transceiver integrates one driver and one receiver. These devices incorporate a failsafe circuit (refer to the Failsafe section). The HGX3491A supports hot-swap functionality, enabling hot insertion without data transmission errors (refer to the Hot-Swap section). The HGX3491A driver features an unlimited slew rate, supporting a maximum data rate of 16Mbps; all devices operate from a single +3.3V supply. The driver incorporates output short-circuit current limiting. A thermal shutdown circuit protects the driver against excessive power dissipation. Upon entering thermal shutdown, the driver outputs are placed in a high-impedance state.

Applications

• RS-422/RS-485 communication
• Digital electric/water meters
• Industrial control
• Industrial embedded computers and peripherals
• Security surveillance systems
• Routers and switches
• Instrumentation
• Level shifting
• EMI-sensitive transceiver applications

Key features

• True fail-safe receiver
• Low-power shutdown mode
• DE and RE with hot-swap input structure
• +3.3V supply voltage
• Up to 256 transceivers on the bus
• Data rate up to 16Mbps
• Enhanced ESD protection on I/O pins (±16kV IEC 61000-4-2 model)