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ISL3332_14 Datasheet, PDF (11/26 Pages) Intersil Corporation – 3.3V, ±15kV ESD Protected, Two Port, Dual Protocol (RS-232/RS-485) Transceivers
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Test Circuits and Waveforms
ISL3332, ISL3333
VCC DE
DY
Y
D
Z
R
RD VOD
R
VOC
FIGURE 1. RS-485 DRIVER VOD AND VOC TEST CIRCUIT
DE
VCC
DY
SIGNAL
GENERATOR
Y
D
Z
CL = 100pF
RDIFF
CL = 100pF
DY
1.5V
OUT (Z)
tPLH
50%
tPHL
OUT (Y)
50%
tDLH
DIFF OUT (Z - Y)
90%
0V
10%
tR
3V
1.5V
0V
tPHL
50%
VOH
VOL
tPLH
50%
tDHL
90%
0V
10%
tF
VOH
VOL
+VOD
-VOD
FIGURE 2A. TEST CIRCUIT
SKEW = |tPLH (Y or Z) - tPHL (Z or Y)|
FIGURE 2B. MEASUREMENT POINTS
FIGURE 2. RS-485 DRIVER PROPAGATION DELAY AND DIFFERENTIAL TRANSITION TIMES
11
FN6362.0
May 27, 2008
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