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FEATURES

APPLICATIONS

DESCRIPTION

V

INVInputCanCorrect

forCrossedWires

SN65HVD1794, SN65HVD1795

SN65HVD1796

70-V Fault-Protected RS-485 Transceiver With Cable Invert

• Bus-Pin Fault Protection to > ±70 V

• Failsafe Receiver for Open-Circuit,

Short-Circuit and Idle-Bus Conditions

• Cable Invert Function Allows Correction for

Reversed Bus Pins

• Low Power Consumption

• Common-Mode Voltage Range (–20 V to 25 V)

–

More Than Doubles TIA/EIA 485 Requirement

• Power-Up, Power-Down Glitch-Free Operation

• Bus I/O Protection

–

±16 kV JEDEC HBM Protection

• Designed for RS-485 and RS-422 Networks

• Reduced Unit Load for Up to 256 Nodes

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 wires.

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.

PRODUCT SELECTION GUIDE

PART NUMBER

DUPLEX

SIGNALING RATE

NODES

CABLE LENGTH

SN65HVD1794

Half

115 kbps

Up to 256

1500 m

SN65HVD1795

PREVIEW

Half

1 Mbps

Up to 256

150 m

SN65HVD1796

PREVIEW

Half

10 Mbps

Up to 64

50 m

For similar features with 3.3 V supply operation, see the SN65HVD1781 (SLLS877).

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Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

UNLESS

OTHERWISE

NOTED

this

document

contains

Copyright © 2008, Texas Instruments Incorporated

PRODUCTION DATA information current as of publication date.

Products conform to specifications per the terms of Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.