ISO7720DWVR datasheet(25/51 Pages) TI2

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8.4 Device Functional Modes

Table 8-2 lists the functional modes for the ISO772x devices.

Table 8-2. Function Table

VCCI

VCCO

INPUT

(INx)(3)

OUTPUT

(OUTx)

COMMENTS

PU(1)

Normal Operation:

A channel output assumes the logic state of the input.

Open

Default

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

the default logic state. The default is High for ISO772x and Low for ISO772x

with F suffix.

Default

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

state based on the selected default option. The default is High for ISO772x

and Low for ISO772x 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.

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 ≥ 2.25 V); PD = Powered down (VCC ≤ 1.7 V); X = Irrelevant; H

= High level; L = Low level

(2)

The outputs are in undetermined state when 1.7 V < VCCI, VCCO < 2.25 V.

(3)

A strongly driven input signal can weakly power the floating VCC via an internal protection diode and cause undetermined output.

8.4.1 Device I/O Schematics

Output

985

1.5 M

INx

VCCI

Input (Devices without F suffix)

985

1.5 M

INx

VCCI

Input (Devices with F suffix)

VCCO

~20

OUTx

Figure 8-3. Device I/O Schematics

www.ti.com

ISO7720, ISO7721

SLLSEP3G – NOVEMBER 2016 – REVISED MAY 2024

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