ISL31470E_10 Datasheet, PDF (11/21 Pages) Intersil Corporation – Fault Protected, Extended Common Mode Range, RS-485/RS-422 Transceivers

ISL31470E, ISL31472E, ISL31475E, ISL31478E
Test Circuits and Waveforms (Continued)
RE
B
A
RO
R
15pF
B
0V
A
750mV
0V
-750mV
SIGNAL
GENERATOR
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 13
RE
1.5V
3V
1.5V
0V
PARAMETER
DE
t_HZ
0
t_LZ
0
t_ZH (Note 12)
0
t_ZL (Note 12)
0
t_ZH(SHDN) (Note 15)
0
t_ZL(SHDN) (Note 15)
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 13
RO
t_ZL, t_ZL(SHDN)
Note 13
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
11
FN7639.0
June 17, 2010