ISL4489E_06 Datasheet, PDF (7/12 Pages) Intersil Corporation – ±15kV ESD Protected, 1/8 Unit Load, 5V, Low Power, High Speed and Slew Rate Limited, Full Duplex, RS-485/RS-422 Transceivers

ISL4489E, ISL4491E
Test Circuits and Waveforms (Continued)
DE
DI
SIGNAL
GENERATOR
Z
D
Y
C_L
500Ω
V_CC
SW ^GND
PARAMETER OUTPUT RE
t_HZ
Y/Z
X
t_LZ
Y/Z
X
t_ZH
Y/Z
X
t_ZL
Y/Z
X
DI
SW C_L (pF)
1/0 GND
15
0/1
V_CC
15
1/0 GND 100
0/1
V_CC
100
DE
t_ZH
OUT (Y, Z)
t_ZL
OUT (Y, Z)
1.5V
3V
1.5V
0V
t_HZ
OUTPUT HIGH
2.3V
V_OH - 0.5V ^VOH
0V
t_LZ
2.3V
OUTPUT LOW
V_CC
V_OL + 0.5V _VOL
FIGURE 3A. TEST CIRCUIT
FIGURE 3B. MEASUREMENT POINTS
FIGURE 3. DRIVER ENABLE AND DISABLE TIMES
+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 4A. TEST CIRCUIT
FIGURE 4B. MEASUREMENT POINTS
FIGURE 4. RECEIVER PROPAGATION DELAY
SIGNAL
GENERATOR
RE
B
A
RO
R
1kΩ
V_CC
15pF
SW ^GND
PARAMETER
t_HZ
t_LZ
t_ZH
t_ZL
DE
A
SW
X
+1.5V
GND
X
-1.5V
V_CC
X
+1.5V
GND
X
-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 + 0.5VV_OL
FIGURE 5A. TEST CIRCUIT
FIGURE 5B. MEASUREMENT POINTS
FIGURE 5. RECEIVER ENABLE AND DISABLE TIMES
7
FN6074.3