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FEATURES

APPLICATIONS

DESCRIPTION

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2

3

4

5

6

7

8

ISO7240CF

9

10

11

12

13

14

15

16

DISABLE

GND1

GND1

GND2

GND2

CTRL

ISO7240CF

QUAD DIGITAL ISOLATOR WITH SELECTABLE FAILSAFE OUTPUT

• 0-Mbps (DC) to 25 Mbps Signaling Rate

• Operates with 3.3-V or 5-V Supplies

–

Low Channel-to-Channel Output Skew;

• High Electromagnetic Immunity

2 ns Max

(see application note SLLA181)

–

Low Pulse-Width Distortion (PWD);

• –40°C to 125°C Operating Range

2.5 ns Max

• Typical 25-Year Life at Rated Working Voltage

• Flat Plasma Display Panels

(see application note SLLA197 and Figure 11)

• Industrial Fieldbus

• 4000-V

• Computer Peripheral Interface

–

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

• Servo Control Interface

IEC 61010-1 and CSA Approved

• Data Acquisition

• 4 kV ESD Protection

The ISO7240CF is a quad-channel digital isolator with an input disable function and a selectable high or low

failsafe-output function with the CTRL pin (pin 10). The device has logic input and output buffers separated by

blocks high voltage, isolates grounds, and prevents noise currents from entering the local ground and interfering

with or damaging sensitive circuitry.

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 for more than 4

µs, the input is assumed to be unpowered or not being actively driven, and

the failsafe circuit drives the output to the logic state selected by the user.

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 also includes an input disable function that 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.

This device may be powered from either 3.3-V or 5-V supplies on either side in any combination. Note that the

signal input pins are 5-V tolerant regardless of the voltage supply level being used.

The device is 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 © 2007–2008, 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.