ISO7730FDWR datasheet(21/39 Pages) TI1

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985

1.5 M

INx

VCCI

Input (Devices without F suffix)

985

1.5 M

INx

VCCI

Input (Devices with F suffix)

Enable

1970

2 M

ENx

VCCO

Output

VCCO

~20

OUTx

ISO7730, ISO7731

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SLLSES0D – SEPTEMBER 2016 – REVISED MAY 2017

Product Folder Links: ISO7730 ISO7731

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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 via an internal protection diode and cause undetermined output.

(3)

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

8.4 Device Functional Modes

Table 2 lists the functional modes for the ISO773x 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 ISO773x and Low for ISO773x

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

IISO773x and Low for ISO773x with F suffix.

When VCCI transitions from unpowered to powered-up, a channel output

assumes the logic state of its 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 its input

8.4.1 Device I/O Schematics

Figure 19. Device I/O Schematics

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