ISO6431FDFPRQ1 datasheet(28/47 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-Q1 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-Q1 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-Q1 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 an ADC application.

VCC1

VCC2

GND1

GND2

2, 8

9, 15

INA

OUTC

ISO6431-Q1

VSS

VDDIO

EN1

EN2

INB

OUTA

OUTB

INC

SPI_SDI

SPI_CLK

SPI_SDO

+VBD

AGND

CH0

SCLK

SDI

SDO

ADS7953-Q1

CH15

BDGND

+VA REFP

MXO

AINP

REFM

VIN

GND

VOUT

REF5025A-Q1

MBR0520L

1:1.33

SN6501-Q1

VCC

GND

3.3V

GND

OUT

TPS76333-Q1

3.3VISO

16 Analog

Inputs

ISO Barrier

0.1µF

4.7kΩ

MSPM0

C2000

AM2xxx

TM4Cxx

Figure 9-1. 3 Channel Typical Application

ISO6431-Q1

SLVSJ21 – JUNE 2026

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