ISL32450E Datasheet, PDF (11/21 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)
RE
B
A
RO
R
15pF
B
1.5V
A
1.5V
+2.25V
+750mV
SIGNAL
GENERATOR
+1.5V
SIGNAL
GENERATOR
t_PLH
t_PHL
V_CC
RO
50%
50%
0V
FIGURE 7A. TEST CIRCUIT
FIGURE 7B. MEASUREMENT POINTS
FIGURE 7. RECEIVER PROPAGATION DELAY AND DATA RATE
SIGNAL
GENERATOR
RE
B
A
RO
R
1kΩ
V_CC
15pF
SW ^GND
NOTE 14
RE
50%
3V
50%
0V
PARAMETER
DE
A
t_HZ
0
+1.5V
t_LZ
0
-1.5V
t_ZH (Note 13)
0
+1.5V
t_ZL (Note 13)
0
-1.5V
t_ZH(SHDN) (Note 16)
0
+1.5V
t_ZL(SHDN) (Note 16)
0
-1.5V
SW
GND
V_CC
GND
V_CC
GND
V_CC
t_ZH, t_ZH(SHDN)
NOTE 14
RO
t_ZL, t_ZL(SHDN)
NOTE 14
RO
t_HZ
OUTPUT HIGH
1.5V
V_OH - 0.5V
V_OH
0V
t_LZ
1.5V
OUTPUT LOW
V_CC
V_OL + 0.5V _VOL
FIGURE 8A. TEST CIRCUIT
FIGURE 8B. MEASUREMENT POINTS
FIGURE 8. RECEIVER ENABLE AND DISABLE TIMES
11
FN7921.0
February 20, 2012