1

FEATURES

APPLICATIONS

DESCRIPTION

P0066-08

V

CC1

OUTA

INB

GND1

V

CC2

INA

OUTB

GND2

ISO7421

D Package

(Top View)

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2

3

4

8

7

6

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ISO7421, ISO7421M

Low-Power Dual Digital Isolators

• Optocoupler Replacement in:

2

• Highest Signaling Rate: up to 250 Mbps

–

Industrial Fieldbus

• Low Power Consumption, Typical I

–

Profibus

Channel:

–

Modbus

–

2.2 mA at 25 Mbps, 4.2 mA at 100 Mbps

–

DeviceNet™ Data Buses

• Very Low Propagation Delay – 9 ns Typ. and

–

Servo Control Interface

Very Low Skew – 300 ps Typ.

–

Motor Control

• Widest T

–

Power Supplies

• 4 kVpeak Maximum Isolation, 2.5 kVrms per UL

–

Battery Packs

1577, IEC/VDE and CSA Approved, IEC

60950-1, IEC 61010-1 End Equipment

Standards Approved. All Approvals Pending.

• 50 kV/µs Transient Immunity, Typical

• Over 25-Year Isolation Integrity at Rated

Voltage

• Operates From 3-V to 5.5-V Supply and Logic

Levels

The ISO7421 and ISO7421M provide galvanic isolation up to 2.5 kVrms for 1 minute per UL. These digital

isolators have two isolated channels with bidirectional channel configuration. Each isolation channel has a logic

power supplies, these devices prevent noise currents on a data bus or other circuit from entering the local

ground and interfering with or damaging sensitive circuitry.

The devices have TTL input thresholds and require two supply voltages from 3 V to 5.5 V, or any combination.

All inputs are 5-V tolerant when supplied from a 3-V supply.

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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.

2

DeviceNet is a trademark of Texas Instruments.

PRODUCTION DATA information is current as of publication date.

Copyright © 2009, 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.