P0066-08

V

CC1

OUTA

INB

GND1

V

CC2

INA

OUTB

GND2

ISO7421

D Package

(Top View)

1

2

3

4

8

7

6

5

V

CC1

INA

INB

GND1

V

CC2

OUTA

OUTB

GND2

ISO7420

D Package

(Top View)

1

2

3

4

8

7

6

5

ISO7420, ISO7420M

ISO7421, ISO7421M

www.ti.com

SLLS984A – JUNE 2009 – REVISED DECEMBER 2009

Low-Power Dual Digital Isolators

Check for Samples: ISO7420, ISO7420M, ISO7421, ISO7421M

1

FEATURES

APPLICATIONS

•

Optocoupler Replacement in:

2

•

Highest Signaling Rate: up to 250 Mbps

–

Industrial Fieldbus

•

–

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

•

–

Power Supplies

•

4-kVpeak Maximum Isolation, 2.5 kVrms per

–

Battery Packs

UL 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

DESCRIPTION

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

isolators have two isolated channels. Each isolation channel has a logic input and output buffer separated by a

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.

1

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.