ISL31480E_10 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
50%
LOWER OF
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
V_OH
V_OL
90%
10%
t_F
+V_OD
-V_OD
SKEW = |t_PLH - t_PHL|
FIGURE 2A. TEST CIRCUIT
FIGURE 2B. MEASUREMENT POINTS
FIGURE 2. DRIVER PROPAGATION DELAY AND DIFFERENTIAL TRANSITION TIMES
DE
DI
Z
D
SIGNAL
Y
GENERATOR
110Ω
V_CC
SW ^GND
C_L
PARAMETER OUTPUT
RE
C_L
DI SW (pF)
t_HZ
t_LZ
t_ZH
t_ZL
t_ZH(SHDN)
t_ZL(SHDN)
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 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 ^VOH
0V
t_LZ
2.3V
OUTPUT LOW
V_CC
V_OL + 0.5V _VOL
FIGURE 3A. TEST CIRCUIT
FIGURE 3B. MEASUREMENT POINTS
FIGURE 3. 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 4A. TEST CIRCUIT
FIGURE 4B. MEASUREMENT POINTS
FIGURE 4. DRIVER DATA RATE
12
FN7638.0
June 25, 2010