ISO6720_V02 datasheet(26/49 Pages) TI

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8.4 Device Functional Modes

Table 8-2 lists the functional modes for the ISO672xB devices.

Table 8-2. Function Table

VCCI (1)

VCCO

INPUT

(INx)(2)

OUTPUT

(OUTx)

COMMENTS

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 ISO672xB and Low for

ISO672xB 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 ISO672xB

and Low for ISO672xB 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(3).

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 ≥ 1.71V); PD = Powered down (VCC ≤ 1.05 V); X = Irrelevant;

H = High level; L = Low level

(2)

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

(3)

The outputs are in undetermined state when 1.89 V < VCCI, VCCO < 2.25 V and 1.05 V < VCCI, VCCO < 1.71 V

8.4.1 Device I/O Schematics

Input (Devices without F suffix)

985

INx

VCCI

Input (Devices with F suffix)

985

INx

VCCI

Output

VCCO

~20

OUTx

VCCI

1.5 M

Figure 8-3. Device I/O Schematics

ISO6720, ISO6721, ISO6721R

SLLSFJ0D – JANUARY 2020 – REVISED SEPTEMBER 2021

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