ISO7740 datasheet(28/55 Pages) TI2

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7.4 Device Functional Modes

Table 7-2 lists the functional modes for the ISO774x-Q1 devices.

Table 7-2. Function Table

VCCI (1)

VCCO

INPUT

(INx)(3)

OUTPUT

ENABLE

(ENx)

OUTPUT

(OUTx)

COMMENTS

H or open

Normal Operation:

A channel output assumes the logic state of the input.

H or open

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 ISO774x-Q1 and

Low for ISO774x-Q1 with F suffix.

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

impedance.

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 ISO774x-Q1 and Low for ISO774x-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.

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 ; Z = High Impedance

(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 through an internal protection diode and cause undetermined output.

ISO7740-Q1, ISO7741-Q1, ISO7742-Q1

SLLSEU0G – NOVEMBER 2016 – REVISED OCTOBER 2024

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