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ISO7220A, ISO7220B, ISO7220C, ISO7220M

ISO7221A, ISO7221B, ISO7221C, ISO7221M

SLLS755N – JULY 2006 – REVISED SEPTEMBER 2015

ISO722x Dual Channel Digital Isolators

A binary input signal is conditioned, translated to a

1 Features

balanced signal, then differentiated by the capacitive

1

•

1, 5, 25, and 150-Mbps Signaling Rate Options

isolation barrier. Across the isolation barrier, a

–

Low Channel-to-Channel Output Skew;

differential comparator receives the logic transition

1-ns Max

information, then sets or resets a flip-flop and the

output circuit accordingly. A periodic update pulse is

–

Low Pulse-Width Distortion (PWD); 1-ns Max

sent across the barrier to ensure the proper dc level

–

Low Jitter Content; 1 ns Typ at 150 Mbps

of the output. If this dc-refresh pulse is not received

•

50 kV/

μs Typical Transient Immunity

every 4

μs, the input is assumed to be unpowered or

not being actively driven, and the failsafe circuit

•

Operates with 2.8-V (C-Grade),

drives the output to a logic high state.

3.3-V, or 5-V Supplies

The small capacitance and resulting time constant

•

4-kV ESD Protection

provide fast operation with signaling rates available

•

High Electromagnetic Immunity

from 0 Mbps (DC) to 150 Mbps (The signaling rate of

•

–40°C to 125°C Operating Range

a line is the number of voltage transitions that are

•

Typical 28-Year Life at Rated Voltage

made per second expressed in the units bps). The A-

(see application report High-Voltage Lifetime of

option, B-option, and C-option devices have TTL

input thresholds and a noise filter at the input that

the ISO72x Family of Digital Isolators (SLLA197)

prevents transient pulses from being passed to the

and Figure 22)

output of the device. The M-option devices have

•

input noise filter and the additional propagation delay.

0884-10):2006-12 and DIN EN 61010-1 (VDE

The ISO7220x and ISO7221x devices require two

0411-1)

supply voltages of 2.8 V (C-Grade), 3.3 V, 5 V, or any

•

combination. All inputs are 5-V tolerant when supplied

•

CSA Approved for Component Acceptance Notice

from a 2.8-V or 3.3-V supply and all outputs are 4-mA

5A and IEC 60950-1

CMOS.

The

ISO7220x

and

ISO7221x

devices

are

2 Applications

characterized

for

operation

over

the

ambient

•

Industrial Fieldbus

temperature range of –40°C to 125°C.

–

Modbus

Device Information(1)

–

Profibus™

PART NUMBER

PACKAGE

BODY SIZE (NOM)

–

DeviceNet™ Data Buses

ISO7220x

SOIC (8)

4.90 mm × 3.91 mm

•

Computer Peripheral Interface

ISO7221x

•

Servo Control Interface

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

•

Data Acquisition

the end of the data sheet.

Simplified Schematic

3 Description

The ISO7220x and ISO7221x devices are dual-

channel digital isolators. To facilitate PCB layout, the

channels are oriented in the same direction in the

ISO7220x and in opposite directions in the ISO7221x.

These devices have a logic input and output buffer

per VDE. Used in conjunction with isolated power

supplies, these devices block high voltage and isolate

connections respectively for the input

grounds, as well as prevent noise currents on a data

channels.

bus or other circuits from entering the local ground

and interfering with or damaging sensitive circuitry.

connections respectively for the output

channels.

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. PRODUCTION DATA.