RS-485 transceiver with slew-rate control, integrated switchable termination and duplex switching

The THVD1424 is a

flexible RS-485 transceiver for industrial applications. The device has features

such as on-chip 120-Ω termination resistor, slew rate control and interchangeability

between half and full duplex mode. All the features are pin-controlled. This enables

the device to be used at any node location (end nodes or middle nodes) in any

network, two-wire (half duplex) or 4-wire (full duplex), slow or fast. End-equipment

designers can now design a common printed circuit board (PCB) and configure it via

software for various application needs. This can save considerable design and

qualification time for the customers.

The bus pins are immune to high levels

of IEC Contact Discharge ESD events, eliminating the need for additional system

level protection components. The device operates from 3 to 5.5-V bus supply, while

the logic supply voltage range is 1.65 V to 5.5 V. The wide common-mode voltage

range and low input leakage on bus pins makes the devices suitable for multi-point

applications over long cable runs.

The device is available in a space-saving,

thermally efficient 16-pin VQFN package. The device is characterized for ambient

temperatures from –40°C to 125°C.