ISL32483E Datasheet, PDF (9/17 Pages) Intersil Corporation – Fault Protected, Extended CMR, RS-485/RS-422 Transceivers

ISL32483E, ISL32485E
Test Circuits and Waveforms (Continued)
DE
V_CC
DI
SIGNAL
GENERATOR
Z
D
Y
54Ω
C_D
+
V_OD
-
DI
DIFF OUT (Y - Z)
-V_OD
3V
0V
+V_OD
0V
FIGURE 6A. TEST CIRCUIT
FIGURE 6. DRIVER DATA RATE
FIGURE 6B. MEASUREMENT POINTS
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
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
15pF
V_CC
SW ^GND
PARAMETER
DE
A
t_HZ
0
+1.5V
t_LZ
0
-1.5V
t_ZH (Note 10)
0
+1.5V
t_ZL (Note 10)
0
-1.5V
t_ZH(SHDN) (Note 13)
0
+1.5V
t_ZL(SHDN) (Note 13)
0
-1.5V
SW
GND
V_CC
GND
V_CC
GND
V_CC
RE
(Note 11)
t_ZH, t_ZH(SHDN)
(Note 11)
RO
t_ZL, t_ZL(SHDN)
(Note 11)
RO
3V
50%
50%
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_CC
V_OL
FIGURE 8A. TEST CIRCUIT
FIGURE 8B. MEASUREMENT POINTS
FIGURE 8. RECEIVER ENABLE AND DISABLE TIMES
9
FN7785.0
January 18, 2011