ISL31480E_10 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)
SIGNAL
GENERATOR
V_CM
RE
B
A
RO
R
SIGNAL
GENERATOR
15pF
B
V_CM + 750mV
V_CM
V_CM
A
V_CM - 750mV
t_PLH
t_PHL
V_CC OR V_L
RO
50%
50%
0V
FIGURE 5A. TEST CIRCUIT
FIGURE 5B. MEASUREMENT POINTS
FIGURE 5. RECEIVER PROPAGATION DELAY AND DATA RATE
SIGNAL
GENERATOR
RE
B
A
RO
R
1kΩ
V_L
OR
V_CC
SW ^GND
15pF
PARAMETER
DE
t_HZ
0
t_LZ
0
t_ZH (Note 12)
0
t_ZL (Note 12)
0
t_ZH(SHDN) (Note 16)
0
t_ZL(SHDN) (Note 16)
0
A
+1.5V
-1.5V
+1.5V
-1.5V
+1.5V
-1.5V
SW
GND
V_{L /} V_CC
GND
V_L / V_CC
GND
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 ^VOH
0V
t_LZ
1.5V
OUTPUT LOW
V_L
OR
V_CC
V_OL + 0.5V ^VOL
FIGURE 6A. TEST CIRCUIT
FIGURE 6B. MEASUREMENT POINTS
FIGURE 6. RECEIVER ENABLE AND DISABLE TIMES
13
FN7638.0
June 25, 2010