ISL31480E_11 Datasheet, PDF (12/24 Pages) Intersil Corporation – Fault Protected, Extended CMR, RS-485/RS-422 Transceivers with Cable Invert

ISL31480E, ISL31483E, ISL31485E, ISL31486E
Test Circuits and Waveforms (Continued)
DI
LOWER OF
50%
50% ^{3V OR VL}
0V
DE
V_L OR V_CC
DI
SIGNAL
GENERATOR
Z
D
Y
375Ω*
C_D
R_D
375Ω*
V_CM
*ONLY USED FOR COMMON
MODE LOAD TESTS
OUT (Z)
OUT (Y)
t_PLH
90%
DIFF OUT (Y - Z)
10%
t_R
t_PHL
90%
10%
t_F
SKEW = |t_PLH - t_PHL|
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
DI
Z
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
X
X
0 (Note 11)
0 (Note 11)
1 (Note 14)
1 (Note 14)
DI
SW C_L (pF)
1/0 GND 50
0/1 V_CC
50
1/0 GND 100
0/1 V_CC 100
1/0 GND 100
0/1 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%
LOWER OF
3V OR V_L
50%
0V
t_HZ
OUTPUT HIGH
2.3V
V_OH - 0.5V
V_OH
0V
t_LZ
V_CC
2.3V
OUTPUT LOW
V_OL + 0.5V _VOL
FIGURE 5A. TEST CIRCUIT
FIGURE 5B. MEASUREMENT POINTS
FIGURE 5. DRIVER ENABLE AND DISABLE TIMES
DE
V_L OR V_CC
DI
SIGNAL
GENERATOR
Z
D
Y
54Ω
C_D
+
V_OD
-
DI
DIFF OUT (Y - Z)
-V_OD
LOWER OF
3V OR V_L
0V
+V_{OD 0V}
FIGURE 6A. TEST CIRCUIT
FIGURE 6. DRIVER DATA RATE
FIGURE 6B. MEASUREMENT POINTS
12
FN7638.2