ISO7421 datasheet(6/20 Pages) TI

6 / 20 page

ISO7420, ISO7420M

ISO7421, ISO7421M

SLLS984D – JUNE 2009 – REVISED JULY 2010

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ELECTRICAL CHARACTERISTICS

VCC1 at 3.3V ± 5%, VCC2 at 5V ± 5%; TA = –40°C to 125°C for ISO742xM, TA = –40°C to 105°C for ISO742X

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

IOH = –4 mA;

ISO7420 / 7421 (5-V side).

VCC – 0.8

4.6

see Figure 1.

VOH

High-level output voltage

ISO7421 (3.3-V side)

VCC – 0.4

IOH = –20 mA; see Figure 1

VCC – 0.1

VCC

IOL = 4 mA; see Figure 1.

0.2

0.4

VOL

Low-level output voltage

IOL = 20 mA; see Figure 1.

0.1

VI(HYS)

Input threshold voltage hysteresis

400

IIH

High-level input current

INx at 0 V or VCC

IIL

Low-level input current

–10

CMTI

Common-mode transient immunity

VI = VCC or 0 V; see Figure 3.

kV/ms

SUPPLY CURRENT (All inputs switching with square wave clock signal for dynamic ICC measurement)

ISO7420

ICC1

Supply current for VCC1

0.2

0.7

DC to 1 Mbps

VI = VCC or 0 V, 15 pF load

ICC2

Supply current for VCC2

ISO7421

ICC1

Supply current for VCC1

1.5

3.5

DC to 1 Mbps

VI = VCC or 0 V, 15 pF load

ICC2

Supply current for VCC2

SWITCHING CHARACTERISTICS

VCC1 at 3.3V ± 5%, VCC2 at 5V ± 5%, TA = –40°C to 125°C for ISO742xM, TA = –40°C to 105°C for ISO742x

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

tPLH, tPHL

Propagation delay time

See Figure 1.

PWD(1)

Pulse width distortion |tPHL – tPLH|

0.5

tsk(pp)

Part-to-part skew time

tsk(o)

Channel-to-channel output skew time

Output signal rise time

See Figure 1.

Output signal fall time

tfs

Fail-safe output delay time from input power loss

See Figure 2.

(1)

Also known as pulse skew.

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