ISL32452EIBZ-T7A Datasheet, PDF (10/21 Pages) Intersil Corporation – ±60V Fault Protected, 3.3V to 5V, ±20V Common Mode Range, RS-485/RS-422 Transceivers with Cable Invert and ±15kV ESD

ISL32450E, ISL32452E, ISL32453E, ISL32455E, ISL32457E
Test Circuits and Waveforms (Continued)
DI
50%
3V
50%
0V
DE
V_CC
DI
Z
D
Y
C_D
R_D
OUT (Z)
OUT (Y)
t_PLH
t_PHL
SIGNAL
GENERATOR
90%
DIFF OUT (Y - Z)
10%
t_R
SKEW = |t_PLH - t_PHL|
90%
10%
t_F
FIGURE 4A. TEST CIRCUIT
FIGURE 4B. MEASUREMENT POINTS
FIGURE 4. DRIVER PROPAGATION DELAY AND DIFFERENTIAL TRANSITION TIMES
V_OH
V_OL
+V_OD
-V_OD
SIGNAL
GENERATOR
DE
Z
DI
D
Y
110Ω
V_CC
SW ^GND
C_L
PARAMETER
t_HZ
t_LZ
t_ZH
t_ZL
t_ZH(SHDN)
t_ZL(SHDN)
OUTPUT
RE
DI SW C_L (pF)
Y/Z
X
1/0 GND 50
Y/Z
X
0/1 V_CC
50
Y/Z
0 (Note 12) 1/0 GND 100
Y/Z
0 (Note 12) 0/1 V_CC 100
Y/Z
1 (Note 15) 1/0 GND 100
Y/Z
1 (Note 15) 0/1 V_CC 100
DE
Note 14
t_ZH, t_ZH(SHDN)
Note 14
OUT (Y, Z)
t_ZL, t_ZL(SHDN)
Note 14
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 6B. MEASUREMENT POINTS
FIGURE 6. DRIVER DATA RATE
10
FN7921.0
February 20, 2012