ISL32430E Datasheet, PDF (10/21 Pages) Intersil Corporation – ±40V Fault Protected, 3.3V to 5V, ±15V Common Mode Range, RS-485/RS-422 Transceivers With Cable Invert and ±15kV ESD

ISL32430E, ISL32432E, ISL32433E, ISL32435E, ISL32437E
Test Circuits and Waveforms (Continued)
3V
DI
50%
50%
0V
DE
V_CC
DI
SIGNAL
GENERATOR
Z
D
Y
C_D
R_D
OUT (Z)
OUT (Y)
t_PLH
90%
DIFF OUT (Y - Z)
10%
t_R
t_PHL
V_OH
V_OL
90%
10%
t_F
+V_OD
-V_OD
FIGURE 4A. TEST CIRCUIT
SKEW = |t_PLH - t_PHL|
FIGURE 4B. MEASUREMENT POINTS
FIGURE 4. DRIVER PROPAGATION DELAY AND DIFFERENTIAL TRANSITION TIMES
SIGNAL
GENERATOR
DE
Z
DI
D
Y
110Ω
C_L
V_CC
SW ^GND
PARAMETER
t_HZ
t_LZ
t_ZH
t_ZL
t_ZH(SHDN)
t_ZL(SHDN)
OUTPUT
Y/Z
Y/Z
Y/Z
Y/Z
Y/Z
Y/Z
RE
DI
X
1/0
X
0/1
0 (Note 11) 1/0
0 (Note 11) 0/1
1 (Note 14) 1/0
1 (Note 14) 0/1
SW C_L (pF)
GND 50
V_CC 50
GND 100
V_CC 100
GND 100
V_CC 100
DE
Note 13
t_ZH, t_ZH(SHDN)
Note 13
OUT (Y, Z)
t_ZL, t_ZL(SHDN)
Note 13
OUT (Y, Z)
50%
3V
50%
0V
t_HZ
OUTPUT HIGH
50%
V_OH - 0.5V
V_OH
0V
t_LZ
50%
OUTPUT LOW
V_CC
V_OL + 0.5V _VOL
FIGURE 5A. TEST CIRCUIT
FIGURE 5B. MEASUREMENT POINTS
FIGURE 5. DRIVER ENABLE AND DISABLE TIMES
DE
V_CC
DI
SIGNAL
GENERATOR
Z
D
Y
54Ω
C_D
+
V_OD
-
DI
DIFF OUT (Y - Z)
3V
0V
+V_OD
-V_OD ^0V
FIGURE 6A. TEST CIRCUIT
FIGURE 6. DRIVER DATA RATE
FIGURE 6B. MEASUREMENT POINTS
10
FN7920.0
March 1, 2012