1

2

3

4

5

6

7

8

ISO7240

9

10

11

12

13

14

15

16

NC

GND1

GND1

GND2

GND2

EN

1

2

3

4

5

6

7

8

ISO7241

9

10

11

12

13

14

15

16

GND1

GND1

GND2

GND2

1

2

3

4

5

6

7

8

ISO7242

9

10

11

12

13

14

15

16

GND1

GND1

GND2

GND2

DISABLE

GND1

GND1

GND2

GND2

CTRL

ISO7240CF

1

2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

ISO7240CF, ISO7240C, ISO7240M

ISO7241C, ISO7241M

ISO7242C, ISO7242M

www.ti.com

SLLS868L – SEPTEMBER 2007 – REVISED JANUARY 2010

HIGH SPEED QUAD DIGITAL ISOLATORS

Check for Samples: ISO7240CF, ISO7240C, ISO7240M, ISO7241C, ISO7241M, ISO7242C, ISO7242M

1

FEATURES

•

Selectable Failsafe Output (ISO7240CF)

•

4 kV ESD Protection

•

25 and 150-Mbps Signaling Rate Options

•

Operate With 3.3-V or 5-V Supplies

–

Low Channel-to-Channel Output Skew;

•

High Electromagnetic Immunity

(see application report SLLA181)

1 ns Max

•

–40°C to 125°C Operating Range

–

Low Pulse-Width Distortion (PWD);

2 ns Max

APPLICATIONS

–

Low Jitter Content; 1 ns Typ at 150 Mbps

•

Industrial Fieldbus

•

Typical 25-Year Life at Rated Working Voltage

•

Computer Peripheral Interface

(see application note SLLA197 and Figure 17)

•

Servo Control Interface

•

•

Data Acquisition

–

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

IEC 61010-1, IEC 60950-1 and CSA

Approved

DESCRIPTION

The ISO7240, ISO7241 and ISO7242 are quad-channel digital isolators with multiple channel configurations and

output enable functions. These devices have logic input and output buffers separated by TI’s silicon dioxide

isolate grounds, and prevent noise currents from entering the local ground and interfering with or damaging

sensitive circuitry.

The ISO7240 has all four channels in the same direction while the ISO7241 has three channels the same

direction and one channel in opposition. The ISO7242 has two channels in each direction.

The C option 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. The M option devices have CMOS Vcc/2 input thresholds and do not

have the input noise-filter or the additional propagation delay.

The ISO7240CF has an input disable function on pin 7, and a selectable high or low failsafe-output function with

the CTRL pin (pin 10). The failsafe-output is a logic high when a logic-high is placed on the CTRL pin or it is left

unconnected. If a logic-low signal is applied to the CTRL pin, the failsafe-output becomes a logic-low output

state. The ISO7240CF input disable function prevents data from being passed across the isolation barrier to the

output. When the inputs are disabled, the outputs are set by the CTRL pin.

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.

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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 © 2007–2010, 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.