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FEATURES

APPLICATIONS

DESCRIPTION

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ISO7230

DWPACKAGE

9

10

11

12

13

14

15

16

NC

NC

GND1

NC

GND1

GND2

GND2

EN

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2

3

4

5

6

7

8

ISO7231

DWPACKAGE

9

10

11

12

13

14

15

16

NC

GND1

NC

GND1

GND2

GND2

ISO7230A

ISO7231A

One Megabit per Second Triple Digital Isolators

• 1-Mbps Signaling Rate

• High Electromagnetic Immunity

–

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 10)

• Data Acquisition

• 4000-V

–

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

IE 61010-1 and CSA Approved

• 4 kV ESD Protection

• Operate With 3.3-V or 5-V Supplies

The ISO7230A and ISO7231A are triple-channel digital isolators each 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 on a data bus or other circuits from entering the local ground and

interfering with or damaging sensitive circuitry.

The ISO7230 triple-channel device has all three channels in the same direction while the ISO7231 has two

channels in one direction and one channel in opposition. These devices have an active-high output enable that

when driven to a low level, places the output in a high-impedance state and turns off internal bias circuitry to

conserve power.

The ISO7230A and ISO7231A have TTL input thresholds and a noise-filter at the input that prevents transient

pulses of up to 2 ns in duration from being passed to the output of the device.

In each device a periodic update pulse is sent across the isolation 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 require two supply voltages of 3.3-V, 5-V, or any combination. All inputs are 5-V tolerant when

supplied from a 3.3-V supply and all outputs are 4-mA CMOS. 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 © 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.