ISL8490E Intersil Corporation, ISL8490E Datasheet - Page 7

• Manufacturer Part Number: ISL8490E
• Description: RS-485/RS-422 Transceivers
• Manufacturer: Intersil Corporation

Test Circuits and Waveforms
PARAMETER OUTPUT
SIGNAL
GENERATOR
SIGNAL
GENERATOR
PARAMETER
t
t
t
t
HZ
ZH
LZ
ZL
SIGNAL
GENERATOR
t
t
t
t
HZ
ZH
LZ
ZL
+1.5V
FIGURE 3A. TEST CIRCUIT
FIGURE 4A. TEST CIRCUIT
FIGURE 5A. TEST CIRCUIT
DE
DI
Y/Z
Y/Z
Y/Z
Y/Z
RE
A
B
B
A
FIGURE 5. RECEIVER ENABLE AND DISABLE TIMES (EXCLUDING ISL8488E, ISL8490E)
RE
FIGURE 3. DRIVER ENABLE AND DISABLE TIMES (EXCLUDING ISL8488E, ISL8490E)
D
DE
X
X
X
X
R
RE
X
X
X
X
R
7
Z
Y
RO
RO
C
ISL8488E, ISL8489E, ISL8490E, ISL8491E
L
1/0
0/1
1/0
0/1
DI
+1.5V
+1.5V
-1.5V
-1.5V
A
15pF
(Continued)
1kΩ
500Ω
15pF
FIGURE 4. RECEIVER PROPAGATION DELAY
GND
GND
V
V
SW
CC
CC
SW
SW
GND
GND
V
V
SW
C
CC
CC
L
GND
100
100
V
15
15
GND
V
CC
(pF)
CC
OUT (Y, Z)
OUT (Y, Z)
RO
A
RE
RO
RO
DE
t
t
FIGURE 3B. MEASUREMENT POINTS
FIGURE 4B. MEASUREMENT POINTS
FIGURE 5B. MEASUREMENT POINTS
ZH
t
ZL
t
ZH
ZL
t
1.5V
1.5V
PLH
1.5V
OUTPUT HIGH
OUTPUT HIGH
1.5V
50%
1.5V
OUTPUT LOW
2.3V
2.3V
OUTPUT LOW
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t
t
HZ
t
LZ
1.5V
PHL
1.5V
t
t
HZ
LZ
1.5V
V
V
OH
OL
50%
V
V
OH
OL
- 0.5V
+ 0.5V
3V
0V
+ 0.5V
- 0.5V
3V
0V
3V
0V
V
V
V
July 26, 2007
0V
OH
CC
OL
V
0V
V
V
V
CC
FN6073.4
0V
OH
CC
OL