C = 0.1 F ±1%

IN

V

OUT

V

CCI

+

–

V

CM

V

CCO

C = 0.1 F ±1%

GNDO

GNDI

S1

+

–

Pass-fail criteria –

output must remain

stable.

C

L

(1)

V

I

IN = 0 V

V

O

C

L

(1)

OUT

V

CCI

t

fs

2.7 V

V

CCI

0 V

V

OL

V

OH

50%

Fail-Safe HIGH

V

I

V

O

V

I

50 W

IN

V

O

Input

Generator

(1)

C

L

(2)

OUT

1.4 V

10%

90%

V

I

V

O

t

PLH

t

PHL

1.4 V

V

CCI

0 V

50%

t

r

t

f

V

OH

50%

V

OL

ISO7420, ISO7420M, ISO7421

www.ti.com

SLLS984I – JUNE 2009 – REVISED JULY 2015

7 Parameter Measurement Information

(1)

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

≤ 50 kHz, 50% duty cycle,

needed in actual application.

(2)

Figure 6. Switching Characteristic Test Circuit and Voltage Waveforms

(1)

Figure 7. Fail-Safe Output Delay-Time Test Circuit and Voltage Waveforms

(1)

Figure 8. Common-Mode Transient Immunity Test Circuit

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Product Folder Links: ISO7420 ISO7420M ISO7421