ISO7841F datasheet(21/37 Pages) TI1

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Input (Device Without Suffix F)

Output

Enable

OUTx

VCCO

~20 W

INx

1.5 MW

985 W

Input (Device With Suffix F)

VCCI

INx

1.5 MW

985 W

VCCI

VCCI VCCI

Enx

2 MW

1970 W

VCCO

VCCO VCCO

ISO7841, ISO7841F

www.ti.com

SLLSEM3F – NOVEMBER 2014 – REVISED APRIL 2016

Product Folder Links: ISO7841 ISO7841F

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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.

8.4 Device Functional Modes

Table 7 lists the ISO7841 functional modes.

Table 7. 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= High for ISO7841 and Low for ISO7841F.

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= High for ISO7841 and

Low for ISO7841F.

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 17. Device I/O Schematics

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