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 

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 () data sheet.

Device Information

1. For all available packages, see the orderable addendum at the end of the data sheet.

Protection Against Bus Shorts