7.4.1 Device I/O Schematics

Input (Device Without Suffix F)

Output

Enable

OUTx

VCCO

≅20W

INx

1.5MW

985W

Input (Device With Suffix F)

VCCI

VCCI

VCCI

INx

1.5MW

985W

VCCI

VCCI

VCCI VCCI

Enx

2MW

1970W

VCCO

VCCO

VCCO VCCO

Figure 7-3. Device I/O Schematics

8 Application and Implementation

Note

Information in the following applications sections is not part of the TI component specification, and

TI does not warrant its accuracy or completeness. TI’s customers are responsible for determining

suitability of components for their purposes. Customers should validate and test their design

implementation to confirm system functionality.

8.1 Application Information

The ISO7842 device is a high-performance, quad-channel digital isolator with a 5.7kVRMS isolation voltage per

UL 1577. The device comes with enable pins on each side that can be used to put the respective outputs in

high impedance for multi-controller driving applications and reduce power consumption. The ISO7842 device

uses single-ended CMOS-logic switching technology. The supply voltage range is from 2.25V to 5.5V for both

supplies, VCC1 and VCC2. When designing with digital isolators, keep in mind that because of the single-ended

design structure, digital isolators do not conform to any specific interface standard and are only intended for

isolating single-ended CMOS or TTL digital signal lines. The isolator is typically placed between the data

controller (that is, μC or UART), and a data converter or a line transceiver, regardless of the interface type or

standard.

8.2 Typical Application

Figure 8-1 shows the typical isolated RS-232 interface implementation.

ISO7842, ISO7842F

SLLSEJ0I – OCTOBER 2014 – REVISED JULY 2025

www.ti.com

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