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ISL32172E Datasheet, PDF (9/20 Pages) Intersil Corporation – QUAD, ±16.5kV ESD Protected, 3.0V to 5.5V, Low Power, RS-422 Transmitters
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ISL32172E, ISL32272E, ISL32372E, ISL32174E, ISL32274E, ISL32374E, ISL32179E
Test Circuits and Waveforms
VCC OR VL EN
DI
Z
D
Y
VOD
RL/2
RL/2 VOC
FIGURE 1. DC DRIVER TEST CIRCUITS
LOWER OF VCC OR VL
DI
1.5V
1.5V
EN
VCC OR VL
DI
SIGNAL
GENERATOR
Z
D
Y
RDIFF
CD
FIGURE 2A. TEST CIRCUIT
tPLH
OUT (Y)
tPHL
OUT (Z)
tDDLH
50%
tSSK
50%
tSSK
0V
tPHL
50%
tPLH
50%
tDDHL
VOH
VOL
VOH
VOL
DIFF OUT (Y - Z)
90%
0V
10%
tR
90%
0V
10%
tF
+VOD
-VOD
tSSK = |tPLH(Y OR Z) - tPHL(Z OR Y)| tDSK = |tDDLH - tDDHL|
FIGURE 2B. MEASUREMENT POINTS
FIGURE 2. DRIVER PROPAGATION DELAY AND DIFFERENTIAL TRANSITION TIMES
EN
DI
SIGNAL
GENERATOR
Z
D
Y
110Ω
VCC
50pF
SW GND
PARAMETER OUTPUT
DI
SW
tHZ
Y/Z
tLZ
Y/Z
tZH (Note 12)
Y/Z
tZL (Note 12)
Y/Z
tSDH (Note 13)
Y/Z
tSDL (Note 13)
Y/Z
1/0
GND
0/1
VCC
1/0
GND
0/1
VCC
1/0
GND
0/1
VCC
EN
tZH
tSDH
OUT (Y, Z)
tZL
tSDL
OUT (Y, Z)
1.5V
1.5V
3V OR VL
0V
tHZ
OUTPUT HIGH
50%
VOH - 0.5V VOH
0V
tLZ
50%
OUTPUT LOW
VCC
VOL + 0.5V VOL
FIGURE 3A. TEST CIRCUIT
FIGURE 3B. MEASUREMENT POINTS
FIGURE 3. DRIVER ENABLE AND DISABLE TIMES
9
FN6824.0
December 16, 2008
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