V

upto70V

FAULT

M0092-01

SN65HVD1785, SN65HVD1786

SN65HVD1787, SN65HVD1791

SN65HVD1792, SN65HVD1793

www.ti.com

SLLS872H – JANUARY 2008 – REVISED FEBRUARY 2010

Fault-Protected RS-485 Transceivers With Extended Common-Mode Range

Check for Samples: SN65HVD1785, SN65HVD1786, SN65HVD1787, SN65HVD1791, SN65HVD1792, SN65HVD1793

1

FEATURES

•

Bus-Pin Fault Protection to:

•

Failsafe Receiver for Open-Circuit,

Short-Circuit and Idle-Bus Conditions

–

> ±70 V ('HVD1785, 86,91,92)

•

Low Power Consumption

–

> ±30 V ('HVD1787, 93)

–

Low Standby Supply Current, 1 mA Typ

•

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

More Than Doubles TIA/EIA 485 Requirement

–

•

Bus I/O Protection

•

Power-Up, Power-Down Glitch-Free Operation

–

±16 kV JEDEC HBM Protection

APPLICATIONS

•

Reduced Unit Load for Up to 256 Nodes

•

Designed for RS-485 and RS-422 Networks

DESCRIPTION

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.

In the 'HVD1785, 'HVD1786, and 'HVD1787, 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. In the 'HVD1793,

the driver differential outputs and the receiver differential inputs are separate pins, to form a bus port suitable for

full-duplex (four-wire bus) communication. These ports feature 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

105°C.

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

PRODUCT SELECTION GUIDE

PART NUMBER

DUPLEX

SIGNALING RATE

NODES

CABLE LENGTH

SN65HVD1785

Half

115 kbps

Up to 256

1500 m

SN65HVD1786

Half

1 Mbps

Up to 256

150 m

SN65HVD1787

Half

10 Mbps

Up to 64

50 m

SN65HVD1791

Full

115 kbps

Up to 256

1500 m

SN65HVD1792

Full

1 Mbps

Up to 256

150 m

SN65HVD1793

Full

10 Mbps

Up to 64

50 m

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas

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

PRODUCTION DATA information is current as of publication date.

Copyright © 2008–2010, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.