SN65HVD1781DR UART Interface IC RS-485 Interface IC 70V Fault-Protected RS-485 Xceivers

1 Features

• Bus-Pin Fault Protection to:

• – > ±70 V (SN65HVD1780, SN65HVD1781)

• – > ±30 V (SN65HVD1782)

• Operation With 3.3-V to 5-V Supply Range

• ±16-kV HBM Protection on Bus Pins

• Reduced Unit Load for Up to 320 Nodes

• Failsafe Receiver for Open-Circuit, Short-Circuit, and Idle-Bus Conditions

• Low Power Consumption

  • – Low Standby Supply Current, 1 μA Maximum

  • – ICC 4-mA Quiescent Current During Operation

• Pin-Compatible With Industry-Standard SN75176

• Signaling Rates of 115 kbps, 1 Mbps, and up to 10 Mbps

• Create a Custom Design using the SN65HVD178x with the WEBENCH® Power Designer

2 Applications

• HVAC Networks

• Security Electronics

• Building Automation

• Telecommunication Equipment

• Motion Control

• Industrial Networks

3 Description

The SN65HVD178x devices are designed to survive overvoltage faults such as direct shorts to power supplies, mis-wiring faults, connector failures, cable crushes, and tool mis-applications. The devices are also robust to ESD events with high levels of protection to the human-body-model specification.

The SN65HVD178x devices combine a differential driver and a differential receiver, which operate from a single power supply. In the SN65HVD1782, the driver differential outputs and the receiver differential inputs are connected internally to form a bus port suitable for half-duplex (two-wire bus) communication. This port features a wide common- mode voltage range, making the devices suitable for multipoint applications over long cable runs. These devices are characterized from –40°C to 125°C. These devices are pin-compatible with the industry- standard SN75176 transceiver, making them drop-in upgrades in most systems.

These devices are fully compliant with ANSI TIA/EIA 485-A with a 5-V supply and can operate with a 3.3-V supply with reduced driver output voltage for low- power applications. For applications where operation is required over an extended common-mode voltage range, see the SN65HVD1785 (SLLS872) data sheet.

Device Information