S0412-01

V

I

50 W

IN

V

O

Input

Generator

(1)

C

L

(2)

OUT

1.4V

10%

90%

V

I

V

O

t

PLH

t

PHL

1.4V

V

CC1

0V

V

/2

CC

t

r

t

f

V

OH

V

/2

CC

V

OL

S0413-01

V

I

IN

V

O

0V

or

V

CC1

C

L

(1)

OUT

V

CC1

t

fs

2.7V

V

CC1

0V

V

OL

V

OH

50%

Fail-SafeHIGH

V

I

V

O

S0414-01

C=0.1 F±1%

m

IN

V

(1)

OUT

V

CC1

+

–

V

CM

V

CC2

C=0.1 F±1%

m

GND2

GND1

S1

+

–

Pass-failcriteria –

outputmustremain

stable.

ISO7420, ISO7420M

ISO7421, ISO7421M

SLLS984A – JUNE 2009 – REVISED DECEMBER 2009

www.ti.com

PARAMETER MEASUREMENT INFORMATION

(1)

The input pulse is supplied by a generator having the following characteristics: PRR

≤ 50 kHz, 50% duty cycle,

(2)

Figure 1. Switching Characteristic Test Circuit and Voltage Waveforms

(1)

Figure 2. Fail-Safe Output Delay-Time Test Circuit and Voltage Waveforms

(1)

Figure 3. Common-Mode Transient Immunity Test Circuit

8

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Copyright © 2009, Texas Instruments Incorporated

Product Folder Link(s): ISO7420, ISO7420M ISO7421, ISO7421M