ISO6431FDFPR datasheet(28/48 Pages) TI2

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9 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.

9.1 Application Information

The ISO643x devices are high-performance, low power, triple-channel digital isolators. These devices come

with enable pins on each side which can be used to put the respective outputs in high impedance for parallel

(multiple) driver applications. The ISO643x devices use single-ended CMOS-logic switching technology.

The supply voltage range is from 2.25V to 5.5V for both supplies, VCC1 and VCC2. Since an isolation barrier

separates the two sides, each side can be sourced independently with any voltage within the Recommended

Operating Conditions section. As an example, supplying ISO643x VCC1 with 3.3V (which is within 2.25V to 5.5V)

and VCC2 with 5V (which is also within 2.25V to 5.5V) is possible. You can use the digital isolator as a logic-level

translator in addition to providing isolation. 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, MCU or FPGA), and a data converter or a line transceiver, regardless of the interface

type or standard.

9.2 Typical Application

3 Channel Typical Application shows the RS485.

VCC1

VCC2

GND1

GND2

2,8

9,15

UCA0RXD

P3.0

UCA0TXD

XOUT

XIN

MSPM0

C2000

AM2xxx

TM4Cxx

0.1μF

ISO6431

ISO BARRIER

4.7nF/

2kV

SM712

10Ω MELF

0.1μF

DVss

DVcc

10μF 0.1μF

MBR0520L

1:2.2

0.1μF

SN6501

Vcc

4,5

GND

OUT

TPS76350

10μF

10Ω MELF

VIN

3.3V

5VISO

INA

INB

OUTC

EN1

OUTA

OUTB

INC

SN65HVD

3082E

EN2

VCC

GND

0.1μF

Figure 9-1. 3 Channel Typical Application

ISO6431

SLVSJ22 – JUNE 2026

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