8.3 Feature Description

Table 8-1 provides an overview of the device features.

Table 8-1. Device Features

PART NUMBER

CHANNEL DIRECTION

MAXIMUM DATA

RATE

DEFAULT OUTPUT

PACKAGE

ISO6440-Q1

4 Forward

0 Reverse

150Mbps

High

DW-16 , DFP-16 ,

DBQ-16

ISO6440F-Q1

4 Forward

0 Reverse

150Mbps

Low

DW-16 , DFP-16 ,

DBQ-16

ISO6441-Q1

3 Forward

1 Reverse

150Mbps

High

DW-16 , DFP-16 ,

DBQ-16

ISO6441F-Q1

3 Forward

1 Reverse

150Mbps

Low

DW-16 , DFP-16 ,

DBQ-16

ISO6442-Q1

2 Forward

2 Reverse

150Mbps

High

DW-16 , DFP-16 ,

DBQ-16

ISO6442F-Q1

2 Forward

2 Reverse

150Mbps

Low

DW-16 , DFP-16 ,

DBQ-16

8.3.1 Electromagnetic Compatibility (EMC) Considerations

Many applications in harsh industrial environment are sensitive to disturbances such as electrostatic discharge

(ESD), electrical fast transient (EFT), surge and electromagnetic emissions. These electromagnetic disturbances

are defined and tested by international standards such as IEC 61000-4-x and CISPR 25. Although system-level

performance and reliability depends, to a large extent, on the application board design and layout, the ISO644x-

Q1 family of devices incorporates many chip-level design techniques to help overall system robustness.

8.4 Device Functional Modes

The following table lists the functional modes for the ISO644x-Q1 devices.

Table 8-2. Function Table

VCCI(1)

VCCO

INPUT

(INx)

OUTPUT

ENABLE

(ENx)

OUTPUT

(OUTx)

COMMENTS

PU

PU

H

H or open

H

Normal Operation: A channel output assumes the logic state of the

input.

L

H or open

L

Open

H or open

Default

Default mode: When INx is open, the corresponding channel output

goes to the default logic state. Default is High for ISO644x-Q1 and

Low for ISO644xF-Q1 (with F suffix).

X

PU

X

L

Z

A low value of output enable causes the outputs to be high-

impedance.

PD

PU

X

H or open

Default

Default mode: When VCCI is unpowered, a channel output assumes

the logic state based on the selected default option. Default is High

for ISO644x-Q1 and Low for ISO644xF-Q1 (with F suffix).

When VCCI transitions from unpowered to powered-up, a channel

output assumes the logic state of the input.

When VCCI transitions from powered-up to unpowered, channel

output assumes the selected default state.

X

PD

X

X

Undetermined

When VCCO is unpowered, a channel output is undetermined(2). When

VCCO transitions from unpowered to powered-up, a channel output

assumes the logic state of the input.

(1)

VCCI = Input-side VCC; VCCO = Output-side VCC; PU = Powered up (VCC ≥ VCC_RO(MIN)); PD = Powered down (VCC ≤ VCC_UVLO–); X =

Irrelevant; H = High level; L = Low level; Z = High Impedance

(2)

The outputs are in undetermined state when VCC_UVLO– ≤ VCCI or VCCO < VCC ≥ VCC_RO(MIN).

ISO6440-Q1, ISO6441-Q1, ISO6442-Q1

SLLSG11 – APRIL 2026

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