1

FEATURES

APPLICATIONS

DESCRIPTION

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

R

RE

D

GND1

Y

Vcc2

B

Z

A

GND2

DE

DWPACKAGE

Vcc1

GND1

GND2

GND2

GND1

DE

5

D

6

R

3

4

RE

Y

Z

B

A

14

11

12

13

functiondiagram

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

R

RE

D

GND1

nc

Vcc2

B

A

nc

GND2

DE

DWPACKAGE

Vcc1

GND1

GND2

GND2

GND1

functiondiagram

D

R

B

A

13

12

DE

6

5

3

4

RE

ISO15

ISO35

ISOLATED 3.3-V FULL AND HALF-DUPLEX RS-485 TRANSCEIVERS

• Security Systems

• 4000-V

UL 1577, IEC 60747-5-2 (VDE 0884, Rev 2)

• Chemical Production

• Factory Automation

• 1/8 Unit Load – Up to 256 Nodes on a Bus

• Motor/motion Control

• Meets or Exceeds TIA/EIA RS-485

• HVAC and Building Automation Networks

Requirements

• Networked Security Stations

• Signaling Rates up to 1 Mbps

• Thermal Shutdown Protection

• Low Bus Capacitance – 16 pF (Typ)

• 50 kV/µs Typical Transient Immunity

• Fail-safe Receiver for Bus Open, Short, Idle

• 3.3-V Inputs are 5-V Tolerant

The ISO15 is an isolated half-duplex differential line transceiver while the ISO35 is an isolated full-duplex

differential line driver and receiver for TIA/EIA 485/422 applications.

These devices are ideal for long transmission lines since the ground loop is broken to allow for a much larger

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

isolation for 60s between the bus-line transceiver and the logic-level interface.

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. These isolated devices can significantly increase protection and reduce the risk of damage to

expensive control circuits.

The ISO15 and ISO35 are qualified for use from –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.