Texas Instruments ISO7221M Bedienungsanleitung

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ISO722x Dual-Channel Digital Isolators

1 Features

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

–Low Channel-to-Channel Output Skew;

1ns Max

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

–Low Jitter Content; 1ns Typ at 150Mbps

•50kV/μs Typical Transient Immunity

•Operates with 2.8V (C-Grade),

3.3V, or 5V Supplies

•4kV ESD Protection

•High Electromagnetic Immunity

•–40°C to +125°C Operating Range

•Typical 28-Year Life at Rated Voltage

(see Isolation Lifetime Projection)

•Safety Related Certifications

–DIN EN IEC 60747-17 (VDE 0884-17)

conformity per VDE

–UL 1577 component recognition program

–IEC 61010-1, IEC 62368-1 certifications

2 Applications

•Factory Automation

–Modbus

–Profibus

™

–DeviceNet

™

Data Buses

•Computer Peripheral Interface

•Servo Control Interface

•Data Acquisition

3 Description

The ISO7220x and ISO7221x family 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 separated by TI’s silicon-dioxide (SiO

2

)

isolation barrier, providing galvanic isolation of up to

4000V

PK

per VDE. Used in conjunction with isolated

power supplies, these devices block high voltage and

isolate grounds, as well as prevent noise currents on

a data bus or other circuits from entering the local

ground and interfering with or damaging sensitive

circuitry.

A binary input signal is conditioned, translated to a

balanced signal, then differentiated by the isolation

barrier. Across the isolation barrier, a differential

comparator receives the logic transition information,

then sets or resets a flip-flop and the output circuit

accordingly. A periodic update pulse is sent across

the barrier to verify that the proper dc level of the

output. If this dc-refresh pulse is not received every

4μs, the input is assumed to be unpowered or not

being actively driven, and the failsafe circuit drives the

output to a logic high state.

The resulting time constant provide fast operation

with signaling rates available from 0Mbps (DC) to

150Mbps (The signaling rate of a line is the number

of voltage transitions that are made per second

expressed in the units bps). The A-option, B-option,

and C-option devices have TTL input thresholds and a

noise filter at the input that prevents transient pulses

from being passed to the output of the device. The

M-option devices have CMOS V

CC

/2 input thresholds

and do not have the input noise filter and the

additional propagation delay.

The ISO7220x and ISO7221x family of devices

require two supply voltages of 2.8V (C-Grade), 3.3V,

5V, or any combination. All inputs are 5V tolerant

when supplied from a 2.8V or 3.3V supply and all

outputs are 4mA CMOS.

The ISO7220x and ISO7221x family of devices

are characterized for operation over the ambient

temperature range of –40°C to +125°C.

Package Information

PART

NUMBER

PACKAGE

(1)

BODY SIZE

(NOM)

PACKAGE

SIZE

(2)

ISO7220x

D (SOIC, 8)

4.90mm ×

3.91mm

4.9mm × 6mm

ISO7221x

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

the end of the data sheet.

(2)The package size (length × width) is a nominal value and

includes pins, where applicable.

V

CCI

and GNDI are supply and ground connections

respectively for the input channels.

V

CCO

and GNDO are supply and ground connections

respectively for the output channels.

Simplified Schematic

ISO7220A, ISO7220B, ISO7220C, ISO7220M, ISO7221A, ISO7221B, ISO7221C, ISO7221M

SLLS755U – JULY 2006 – REVISED OCTOBER 2025

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.

Produktspezifikationen