1

FEATURES

APPLICATIONS

DESCRIPTION

V

upto70V

FAULT

M0092-02

SN65HVD1780

SN65HVD1781

SN65HVD1782

70-V Fault-Protected RS-485 Transceivers with 3.3-V to 5-V Operation

These devices combine a differential driver and a

• Bus-Pin Fault Protection to > ±70 V

differential receiver, which operate from a single

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

power supply. The driver differential outputs and the

• ±16 kV HBM Protection on Bus Pins

receiver differential inputs are connected internally to

form a bus port suitable for half-duplex (two-wire bus)

• Reduced Unit Load for up to 320 Nodes

communication.

This

port

features

a

wide

• Failsafe Receiver for Open-Circuit,

common-mode voltage range, making the devices

Short-Circuit and Idle-Bus Conditions

suitable for multipoint applications over long cable

• Low Power Consumption

runs. These devices are characterized from –40°C to

125°C. These devices are pin-compatible with the

–

Low Standby Supply Current, 1

µA Max

industry-standard SN75176 transceiver, making them

–

drop-in upgrades in most systems.

• Pin-Compatible With Industry-Standard

These devices are fully compliant with ANSI TIA/EIA

SN75176

485-A with a 5-V supply and can operate with a 3.3-V

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

supply

with

reduced

driver

output

voltage

for

to 10 Mbps

low-power

applications.

For

applications

where

operation

is

required

over

an

extended

common-mode

voltage

range,

see

the

• HVAC Networks

SN65HVD1785 (SLLS872) data sheet.

• Security Electronics

• Building Automation

• Telecomm Equipment

• Motion Control

• Industrial 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. The internal current-limit

circuits allow fault survivability without causing the

high bus currents that otherwise might damage

external components or power supplies. They are

also robust to ESD events, with high levels of

protection to the JEDEC or IEC human-body-model

Transceiver

Signaling Rate

Number of Nodes

specification.

HVD1780

Up to 115 kbps

Up to 320

HVD1781

Up to 1 Mbps

Up to 320

HVD1782

Up to 10 Mbps

Up to 64

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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 © 2007–2008, 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.