SLLS935A – AUGUST 2008 – REVISED AUGUST 2012
70-V Fault-Protected RS-485 Transceiver With Cable Invert
Check for Samples: SN65HVD1794, SN65HVD1795, SN65HVD1796
• Bus-Pin Fault Protection to > ±70 V
• Cable Invert Function Allows Correction for
Reversed Bus Pins
• Common-Mode Voltage Range (–20 V to 25 V)
More Than Doubles TIA/EIA 485 Requirement
• Bus I/O Protection
– ±16 kV JEDEC HBM Protection
• Reduced Unit Load for Up to 256 Nodes
• Failsafe Receiver for Open-Circuit, Short-
Circuit and Idle-Bus Conditions
• Low Power Consumption
– ICC 5 mA Quiescent During Operation
• Power-Up, Power-Down Glitch-Free Operation
• Designed for RS-485 and RS-422 Networks
These 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. They are also robust to ESD events, with high
levels of protection to human-body model specifications.
These devices combine a differential driver and a differential receiver, which operate from a single power supply.
The driver differential outputs and the receiver differential inputs are connected internally to for a bus port
suitable for half-duplex (two-wire bus) communication. A cable invert pin (INV) allows active correction of mis-
wires that may occur during installation. Upon detecting communication errors, the user can apply a logic HIGH
to the INV pin, effectively inverting the polarity of the differential bus port, thereby correcting for the reversed bus
These devices feature a wide common-mode voltage range, making them suitable for multi-point applications
over long cable runs. These devices are characterized from –40°C to 105°C.
INV Input Can Correct
for Crossed Wires
VFAULT up to 70 V
Table 1. PRODUCT SELECTION GUIDE
Up to 256
Up to 256
Up to 64
For similar features with 3.3 V supply operation, see the SN65HVD1781 (SLLS877).
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