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FEATURES

APPLICATIONS

DESCRIPTION

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

ISO7240

ISO7241

ISO7242

SLLS868A – SEPTEMBER 2007 – REVISED DECEMBER 2007

www.ti.com

QUAD DIGITAL ISOLATORS

• 1, 25, and 150-Mbps Signaling Rate Options

• High Electromagnetic Immunity

(see application report SLLA181)

–

Low Channel-to-Channel Output Skew;

• –40°C to 125°C Operating Range

1 ns Max

–

Low Pulse-Width Distortion (PWD);

2 ns Max

• Industrial Fieldbus

–

Low Jitter Content; 1 ns Typ at 150 Mbps

• Computer Peripheral Interface

• Typical 25-Year Life at Rated Working Voltage

• Servo Control Interface

(see application note SLLA197 and Figure 15)

• Data Acquisition

• 4000-V

• UL 1577 Certified

• 4 kV ESD Protection

• Operate With 3.3-V or 5-V Supplies

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 A and 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.

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. (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.

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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, 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.