ISL4485E Datasheet, PDF (6/11 Pages) Intersil Corporation – ±15kV ESD Protected, 20Mbps, 5V, Low Power, RS-485/RS-422 Transceiver

ISL4485E
Test Circuits and Waveforms (Continued)
DE
V_CC
DI
SIGNAL
GENERATOR
Z
D
Y
+
60Ω
C_D = 200pF ^VOD
-
DI
DIFF OUT (Y - Z)
-V_OD
3V
0V
+V_{OD 0V}
FIGURE 4A. TEST CIRCUIT
FIGURE 4B. MEASUREMENT POINTS
FIGURE 4. DRIVER DATA RATE
+1.5V
RE
B
A
RO
R
15pF
SIGNAL
GENERATOR
3V
A
1.5V
1.5V
0V
t_PLH
t_PHL
V_CC
RO
50%
50%
0V
FIGURE 5A. TEST CIRCUIT
FIGURE 5B. MEASUREMENT POINTS
FIGURE 5. RECEIVER PROPAGATION DELAY
SIGNAL
GENERATOR
RE
B
A
RO
R
1kΩ
15pF
V_CC
SW ^GND
PARAMETER
t_HZ
t_LZ
t_ZH
t_ZL
DE
A
SW
0
+1.5V
GND
0
-1.5V
V_CC
0
+1.5V
GND
0
-1.5V
V_CC
RE
t_ZH
RO
t_ZL
RO
1.5V
3V
1.5V
0V
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
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