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

V

I

IN

V

O

0 V

or

V

CC1

C

L

(1)

OUT

V

CC1

t

fs

2.7 V

V

CC1

0 V

V

OH

V

OL

50%

Fail-Safe LOW (ISO742xFx)

V

I

V

O

V

OL

V

OH

50%

Fail-Safe HIGH (ISO742xE)

V

O

C = 0.1 F ±1%

m

IN

V

OH

(1)

or V

OL

OUT

V

CC1

+

–

V

CM

V

CC2

C = 0.1 F ±1%

m

GND2

GND1

S1

+

–

Pass-fail criteria –

output must remain

stable.

ISO7420E, ISO7420FE, ISO7420FCC

ISO7421E, ISO7421FE, ISO7421FCC

SLLSE45D

– DECEMBER 2010 – REVISED DECEMBER 2011

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,

needed in an actual application.

(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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© 2010–2011, Texas Instruments Incorporated

Product Folder Link(s): ISO7420E ISO7420FE ISO7420FCC ISO7421E ISO7421FE ISO7421FCC