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ISO7420, ISO7420M, ISO7421

SLLS984I – JUNE 2009 – REVISED JULY 2015

ISO742x Low-Power Dual-Channel Digital Isolators

1 Features

3 Description

The ISO7420, ISO7420M and ISO7421 provide

1

•

Highest Signaling Rate: 1 Mbps

•

UL.

These

digital

isolators

have

two

isolated

(3.3-V operation):

channels. Each isolation channel has a logic input

–

ISO7420: 1.1 mA, ISO7421: 1.5 mA

and output buffer separated by a silicon dioxide

•

Low Propagation Delay – 9 ns Typical

isolated power supplies, these devices prevent noise

•

Low Skew – 300 ps Typical

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

•

50-kV/

μs Transient Immunity, Typical

temperature range (–40°C to 125°C).

•

Over 25-Year Isolation Integrity at Rated Voltage

These devices have TTL input thresholds and require

•

Operates From 3.3-V and 5-V Supply and Logic

two supply voltages, 3.3 or 5 V, or any combination.

Levels

All inputs are 5-V tolerant when supplied from a 3.3-V

•

3.3-V and 5-V Level Translation

supply.

•

Narrow Body SOIC-8 Package

Note: The ISO7420 and ISO7421 are specified for

•

Safety and Regulatory Approvals:

signaling rates up to 1 Mbps. Due to their fast

–

response time, under most cases, these devices will

and DIN EN 61010-1

also transmit data with much shorter pulse widths.

Designers should add external filtering to remove

–

spurious signals with input pulse duration <20 ns if

–

CSA Component Acceptance Notice 5A, IEC

desired.

60950-1 and IEC 61010-1 Standards

Device Information(1)

–

CQC Certification per GB4943.1-2011

PART NUMBER

PACKAGE

BODY SIZE (NOM)

2 Applications

ISO7420

ISO7420M

SOIC (8)

4.90 mm × 3.91 mm

•

Optocoupler Replacement in:

ISO7421

–

Industrial Fieldbus

(1) For all available packages, see the orderable addendum at

–

Profibus

the end of the data sheet.

–

Modbus

–

DeviceNet™ Data Buses

–

Servo Control Interface

–

Motor Control

–

Power Supplies

–

Battery Packs

Simplified Schematic

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. UNLESS OTHERWISE NOTED, this document contains PRODUCTION

DATA.