ISL8485, ISL8490, ISL8491

FN6046 Rev 10.02

Page 7 of 15

Oct 2, 2023

Test Circuits and Waveforms

FIGURE 1. DRIVER VOD AND VOC

FIGURE 2A. TEST CIRCUIT

FIGURE 2B. MEASUREMENT POINTS

FIGURE 2. DRIVER PROPAGATION DELAY AND DIFFERENTIAL TRANSITION TIMES

D

DE

DI

VCC

VOD

VOC

R

R

Z

Y

D

DE

DI

VCC

SIGNAL

GENERATOR

CL = 100pF

RDIFF

Z

Y

CL = 100pF

OUT (Y)

3V

0V

tPLH

1.5V

1.5V

VOH

VOL

50%

50%

tPHL

OUT (Z)

tPHL

VOH

VOL

50%

50%

tPLH

DIFF OUT (Y - Z)

tR

+VOD

-VOD

90%

90%

tF

10%

10%

DI

SKEW = |tPLH (Y or Z) - tPHL (Z or Y)|