1

2

3

4

5

6

7

8

ISO7240A

9

10

11

12

13

14

15

16

NC

GND1

GND1

GND2

GND2

EN

1

2

3

4

5

6

7

8

ISO7241A

9

10

11

12

13

14

15

16

GND1

GND1

GND2

GND2

1

2

3

4

5

6

7

8

ISO7242A

9

10

11

12

13

14

15

16

GND1

GND1

GND2

GND2

ISO7240A

ISO7241A

ISO7242A

www.ti.com

SLLS905E – MAY 2008 – REVISED JANUARY 2010

1-Mbps QUAD DIGITAL ISOLATORS

Check for Samples: ISO7240A, ISO7241A, ISO7242A

1

FEATURES

•

APPLICATIONS

•

Industrial Fieldbus

–

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

•

Computer Peripheral Interface

IEC 61010-1, IEC 60950-1 and CSA

Approved

•

Servo Control Interface

•

Data Acquisition

•

4 kV ESD Protection

•

Operate With 3.3-V or 5-V Supplies

•

Typical 25-Year Life at Rated Working Voltage

(See Application Note (SLLA197 ) and

Figure 10)

•

High Electromagnetic Immunity

(See Application Report (SLLA181))

•

–40°C to 125°C Operating Range

DESCRIPTION

See the Product Notification section. The ISO7240A, ISO7241A and ISO7242A are quad-channel digital isolators

with multiple channel configurations and output enable functions. These devices have logic input and output

these devices block high voltage, isolate grounds, and prevent noise currents from entering the local ground and

interfering with or damaging sensitive circuitry.

The ISO7240A has all four channels in the same direction while the ISO7241A has three channels the same

direction and one channel in opposition. The ISO7242A has two channels in each direction.

The devices have TTL input thresholds and a noise-filter at the input that prevents transient pulses from being

passed to the output of the device.

A periodic update pulse is sent across the barrier to ensure the proper dc level of the output. If this dc-refresh

pulse is not received, the input is assumed to be unpowered or not being actively driven, and the failsafe circuit

drives the output to a logic high state. (See ISO7240CF (SLLS869) or contact TI for a logic low failsafe option).

These devices may be powered from either 3.3-V or 5-V supplies on either side in any 3.3-V / 3.3-V, 5-V / 5-V,

5-V / 3.3-V, or 3.3-V / 5-V combination. Note that the signal input pins are 5-V tolerant regardless of the voltage

supply level being used.

These devices are characterized for operation over the ambient temperature range of –40°C to 125°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 © 2008–2010, 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.

Not Recommended for New Designs