ISO7741FDW datasheet(27/52 Pages) TI

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ISO7740, ISO7741, ISO7742

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SLLSEP4G – MARCH 2016 – REVISED FEBRUARY 2020

Product Folder Links: ISO7740 ISO7741 ISO7742

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(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)

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

(3)

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

9.4 Device Functional Modes

Table 2 lists the functional modes for the ISO774x devices.

Table 2. Function Table(1)

VCCI

VCCO

INPUT

(INx)(2)

OUTPUT

ENABLE

(ENx)

OUTPUT

(OUTx)

COMMENTS

H or open

Normal Operation:

A channel output assumes the logic state of its input.

H or open

Open

H or open

Default

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

goes to its default logic state. Default is High for ISO774x and Low for

ISO774x 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 and Low for ISO774x 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.

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