IN

1 MW

500 W

ISO742xFx Input

VCCI

OUT

8 W

13 W

Output

VCCO

VCCI

IN

1 MW

500 W

ISO742xE Input

VCCI

VCCI

VCCI

ISO7420E, ISO7420FE, ISO7421E, ISO7421FE

SLLSE45F – DECEMBER 2010 – REVISED JULY 2015

www.ti.com

8.4 Device Functional Modes

Table 2. Functional Table(1)

OUTPUT

INPUT

OUTA, OUTB

VCCI

VCCO

INA, INB

ISO7420E / ISO7421E

ISO7420FE / ISO7421FE

H

H

H

PU

PU

L

L

L

Open

H(2)

L(3)

PD

PU

X

H(2)

L(3)

X

PD

X

Undetermined

Undetermined

(1)

VCCI = Input-side VCC; VCCO = Output-side VCC; PU = Powered up (VCC ≥ 3 V); PD = Powered down (VCC ≤ 2.1 V); X = Irrelevant; H =

High level; L = Low level;

(2)

In fail-safe condition, output defaults to high level

(3)

In fail-safe condition, output defaults to low level

8.4.1 Device I/O Schematic

Figure 22. Device I/O Schematics

20

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