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

SLLS984D – JUNE 2009 – REVISED JULY 2010

Low-Power Dual Digital Isolators

Check for Samples: ISO7420, ISO7420M, ISO7421, ISO7421M

1

FEATURES

APPLICATIONS

•

Optocoupler Replacement in:

2

•

Highest Signaling Rate: 1 Mbps

–

Industrial Fieldbus

•

–

Profibus

Channel (3.3V operation):

–

Modbus

–

ISO7420: 1.1 mA, ISO7421: 1.5 mA

–

DeviceNet™ Data Buses

•

Low Propagation Delay – 9 ns Typ. and Low

–

Servo Control Interface

Skew – 300 ps Typ.

–

Motor Control

•

–

Power Supplies

•

4-kVpeak Maximum Isolation, 2.5 kVrms per

–

Battery Packs

UL 1577, IEC/VDE and CSA Approvals, IEC

60950-1, IEC 61010-1 End Equipment

Standards Approvals. All Approvals Pending.

•

50 kV/ms Transient Immunity, Typical

•

Over 25-Year Isolation Integrity at Rated

Voltage

•

Operates From 3.3V and 5V Supply and Logic

Levels

DESCRIPTION

The ISO7420, ISO7420M, 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

devices prevent noise currents on a data bus or other circuit from entering the local ground and interfering with or

damaging sensitive circuitry. The suffix M indicates wide temperature range (–40°C to 125°C).

The devices have TTL input thresholds and require two supply voltages, 3.3V or 5V, or any combination. All

inputs are 5-V tolerant when supplied from a 3.3V supply.

Note: The ISO7420 and ISO7421 are specified for signaling rates up to 1 Mbps. Due to their fast response time,

under most cases, these devices will also transmit data with much shorter pulse widths. Designers should add

external filtering to remove spurious signals with input pulse duration < 20ns if desired.

SPACER

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.

UNLESS

OTHERWISE

NOTED

this

document

contains

Copyright © 2009–2010, Texas Instruments Incorporated

PRODUCTION DATA information current as of publication date.

Products conform to specifications per the terms of Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.