C = 0.1 F ±1%

IN

V

OH or VOL

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

ISO7421-EP

www.ti.com

SLLSEN3 – DECEMBER 2015

7 Parameter Measurement Information

(1)

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

≤ 50 kHz, 50% duty cycle,

tr ≤ 3 ns, tf ≤ 3 ns, ZO = 50 Ω. At the input, a 50-Ω resistor is required to terminate the Input Generator signal. It is not

needed in actual application.

(2)

CL = 15 pF and includes instrumentation and fixture capacitance within ±20%.

Figure 6. Switching Characteristic Test Circuit and Voltage Waveforms

(1)

CL = 15 pF ± 20% includes instrumentation and fixture capacitance.

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

(1)

CL = 15 pF and includes instrumentation and fixture capacitance within ±20%.

Figure 8. Common-Mode Transient Immunity Test Circuit

Copyright © 2015, Texas Instruments Incorporated

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