1

FEATURES

APPLICATIONS

DESCRIPTION

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

R

RE

D

GND1

NC

V

CC2

B

A

NC

GND2

DE

DW PACKAGE

(TOP VIEW)

V

CC1

GND1

GND2

ISODE

PV

ISO1176

functiondiagram

DE

6

D

5

R

3

4

RE

ISODE

10

B

A

13

12

PV

7

ISO1176

ISOLATED RS-485 PROFIBUS TRANSCEIVER

• 50 kV/µs Typical Transient Immunity

• 4000-V

• Failsafe Receiver for Bus Open, Short, Idle

• Bus-Pin ESD Protection

• 3.3-V Inputs are 5-V Tolerant

–

16 kV HBM Between Bus Pins and GND2

–

6 kV HBM Between Bus Pins and GND1

• Profibus

• Meets or Exceeds the Requirements of

• Factory Automation

EN 50170 and TIA/EIA-485

• Networked Sensors

• Signaling Rates up to 40 Mbps

• Motor/Motion Control

• Differential Output Exceeds 2.1 V (54 Ω Load)

• HVA and Building Automation Networks

• Low Bus Capacitance – 10 pF (MAX)

• Networked Security Stations

The ISO1176 is an isolated differential line transceiver designed for use in PROFIBUS applications. The device

is ideal for long transmission lines since the ground loop is broken to provide for operation with a much larger

common mode voltage range. The symmetrical isolation barrier of each device is tested to provide 2500 Vrms of

isolation between the line transceiver and the logic level interface.

The galvanically isolated differential bus transceiver is an integrated circuit designed for bi-directional data

communication on multipoint bus-transmission lines. The transceiver combines a galvanically isolated differential

line driver and differential input line receiver. The driver has an active-high enable with isolated enable-state

output on the ISODE pin (pin 10) to facilitate direction control. The driver differential outputs and the receiver

differential inputs connect internally to form a differential input/output (I/O) bus port that is designed to offer

minimum loading to the bus allowing up to 160 nodes.

The PV pin (pin 7) is provided as a full-chip enable option. All device outputs become high impedance when a

logic low is applied to the PV pin. For more information, see the function tables in the device information section.

Any cabled I/O can be subjected to electrical noise transients from various sources. These noise transients can

cause damage to the transceiver and/or near-by sensitive circuitry if they are of sufficient magnitude and

duration. The ISO1176 can significantly reduce the risk of data corruption and damage to expensive control

circuits.

The device is characterized for operation over the ambient temperature range of –40°C to 85°C.

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, 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.