ISL31480E_11 Datasheet, PDF (13/24 Pages) Intersil Corporation – Fault Protected, Extended CMR, RS-485/RS-422 Transceivers with Cable Invert

ISL31480E, ISL31483E, ISL31485E, ISL31486E
Test Circuits and Waveforms (Continued)
RE
B
A
RO
R
15pF
B
V_CM + 750mV
V_CM
V_CM
A
V_CM - 750mV
SIGNAL
GENERATOR
SIGNAL
GENERATOR
V_CM
FIGURE 7A. TEST CIRCUIT
t_PLH
t_PHL
V_CC OR V_L
RO
50%
50%
0V
FIGURE 7B. MEASUREMENT POINTS
FIGURE 7. RECEIVER PROPAGATION DELAY AND DATA RATE
SIGNAL
GENERATOR
RE
B
RO
AR
1kΩ
15pF
V_L
OR
V_CC
SW ^GND
PARAMETER
DE
A
SW
t_HZ
0
+1.5V
GND
t_LZ
0
-1.5V
V_{L /} V_CC
t_ZH (Note 12)
0
+1.5V
GND
t_ZL (Note 12)
0
-1.5V
V_L / V_CC
t_ZH(SHDN) (Note 15)
0
+1.5V
GND
t_ZL(SHDN) (Note 15)
0
-1.5V
V_L / V_CC
(Note 13)
RE
t_ZH, t_ZH(SHDN)
(Note 13)
RO
t_ZL, t_ZL(SHDN)
(Note 13)
RO
50%
50%
LOWER OF
3V OR V_L
0V
t_HZ
OUTPUT HIGH
1.5V
V_OH - 0.5V
V_OH
0V
t_LZ
1.5V
OUTPUT LOW
V_OL + 0.5V
V_L
OR
V_CC
V_OL
FIGURE 8A. TEST CIRCUIT
FIGURE 8B. MEASUREMENT POINTS
FIGURE 8. RECEIVER ENABLE AND DISABLE TIMES
13
FN7638.2