ISO6440FDFPRQ1 datasheet(30/44 Pages) TI2

30 / 44 page

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 ISO644x-Q1 devices are high-performance, low power, quad-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 ISO644x-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 ISO644x-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

Figure 9-1 shows an isolated dual CAN interface implementation.

MBR0520L

1:1.33

SN6505x-Q1

GND

3.3 V

GND

OUT

TPS76350-Q1

ISO 5V

VCC

GND

CANH1

CANL1

RXD1

TXD1

TCAN1046-Q1

ISO Barrier

Vcc

VCC1

VCC2

GND1

GND2

INA

OUTA

INC

OUTC

ISO6442-Q1

INB

OUTD

OUTB

IND

RXD2

TXD2

CANH2

CANL2

System Controller

STBx

VDD

CAN FD

Controller

CAN FD

Controller

EN2

EN1

Figure 9-1. Typical Isolated Dual CAN Application Circuit

ISO6440-Q1, ISO6441-Q1, ISO6442-Q1

SLLSG11 – APRIL 2026

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Product Folder Links: ISO6440-Q1 ISO6441-Q1 ISO6442-Q1

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