ISO7821 datasheet(22/39 Pages) TI1

22 / 39 page

ISO7821, ISO7821F

SLLSEM2F – NOVEMBER 2014 – REVISED MARCH 2016

www.ti.com

Product Folder Links: ISO7821 ISO7821F

Submit Documentation Feedback

(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

ISO7821 functional modes are shown in Table 6.

Table 6. ISO7821 Function Table(1)

VCCI

VCCO

INPUT

(INx)(2)

OUTPUT ENABLE

(ENx)

(DWW Package Only)

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 high logic state. Default= High for ISO7821 and Low

for ISO7821F.

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

ISO7821 and Low for ISO7821F.

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

ISO7821 Datasheet(PDF) 22 Page - Texas Instruments

ISO7821 Datasheet(HTML) 22 Page - Texas Instruments

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39

Datasheet Download

Link URL