GND1

MCU

DGND

Digital

Ground

ISO

Ground

Galvanic

Isolation Barrier

ISO7021

GND2

ADC

Data Rate (Kbps)

1

10

100

1000 2000

4

10

100

200

D001

D001

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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. ADVANCE INFORMATION for pre-production products; subject to

change without notice.

ISO7021

SLLSFA0 – JULY 2019

ISO7021 Ultra-Low Power Two-Channel Digital Isolator

1

1 Features

1

•

Ultra-low power consumption

–

4.8 μA per channel quiescent current (3.3 V)

–

15 μA per channel at 100 kbps (3.3 V)

–

120 μA per channel at 1 Mbps (3.3 V)

•

Robust isolation barrier

–

>100-year projected lifetime

–

–

±100 kV/μs typical CMTI

•

Wide supply range: 1.71 V to 1.89 V and 2.25 V to

5.5 V

•

Wide temperature range: –55°C to +125°C

•

Small 8-SOIC package (8-D)

•

Signaling rate: Up to 4 Mbps

•

Default output High (ISO7021) and Low

(ISO7021F) options

•

Robust electromagnetic compatibility (EMC)

–

System-level ESD, EFT, and surge immunity

–

±8 kV IEC 61000-4-2 contact discharge

protection across isolation barrier

–

Very low emissions

•

Safety-related certifications (planned):

–

UL 1577 Component Recognition Program

–

DIN V VDE V 0884-11

–

CQC, TUV and CSA certifications

2 Applications

•

4-mA to 20-mA loop powered field transmitters

•

Factory automation, process automation

•

Low-power GPIO, UART isolation

3 Description

The

ISO7021

device

is

an

ultra-low

power,

multichannel digital isolator that can be used to

isolate CMOS or LVCMOS digital I/Os. Each isolation

channel has a logic input and output buffer separated

by

a

double

capacitive

silicon

dioxide

insulation barrier. Innovative edge based architecture

combined

with

an

ON-OFF

keying

modulation

scheme allows these isolators to consume very-low

UL1577.

The

per

channel

dynamic

current

consumption of the device is under 120 μA/Mbps and

the per channel static current consumption is 4.8 μA

at 3.3 V, allowing for use of the ISO7021 in both

power and thermal constrained system designs.

The device can operate as low as 1.71 V, as high as

5.5 V, and is fully functional with different supply

voltages on each side of isolation barrier. The two-

channel isolator comes in a narrow body 8-SOIC

package with one forward and one reverse-direction

channel in a 8-SOIC package. The device has default

output high and low options. If the input power or

signal is lost, default output is high for the ISO7021

device without the suffix F and low for the ISO7021F

device with the F suffix. See the Device Functional

Modes section for more information.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

ISO7021

SOIC (8-D)

4.90 mm × 3.91 mm

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

the end of the data sheet.

Simplified Application Schematic

Data Rate vs Power Consumption at 3.3 V