ISL31490E_10 Datasheet, PDF (13/27 Pages) Intersil Corporation – ±60V Fault Protected, 5V, RS-485/RS-422 Transceivers with ±25V Common Mode Range

ISL31490E, ISL31491E, ISL31492E, ISL31493E, ISL31495E, ISL31496E,
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
V_CM
SIGNAL
GENERATOR
t_PLH
t_PHL
V_CC
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_CC
SW ^GND
15pF
(Note 15)
RE
1.5V
3V
1.5V
0V
PARAMETER
DE
t_HZ
0
t_LZ
0
t_ZH (Note 14)
0
t_ZL (Note 14)
0
t_ZH(SHDN) (Note 17)
0
t_ZL(SHDN) (Note 17)
0
A
+1.5V
-1.5V
+1.5V
-1.5V
+1.5V
-1.5V
SW
GND
V_CC
GND
V_CC
GND
V_CC
t_ZH, t_ZH(SHDN)
(Note 15)
RO
t_ZL, t_ZL(SHDN)
(Note 15)
RO
t_HZ
OUTPUT HIGH
1.5V
V_OH - 0.5V ^VOH
0V
t_LZ
1.5V
OUTPUT LOW
V_CC
V_OL + 0.5V _VOL
FIGURE 6A. TEST CIRCUIT
FIGURE 6B. MEASUREMENT POINTS
FIGURE 6. RECEIVER ENABLE AND DISABLE TIMES
13
FN7637.0
June 17, 2010