isl81387 Intersil Corporation, isl81387 Datasheet - Page 12

• Manufacturer Part Number: isl81387
• Description: ?15kv Esd Protected, 5v, Dual Protocol Rs-232/rs-485 Transceivers
• Manufacturer: Intersil Corporation

Test Circuits and Waveforms
FOR SHDN TESTS, SWITCH ON AND RXEN L- H SIMULTANEOUSLY
SIGNAL
GENERATOR
PARAMETER
t
t
ZH(SHDN)
ZL(SHDN)
SIGNAL
GENERATOR
SIGNAL
GENERATOR
SIGNAL
GENERATOR
t
t
t
t
HZ
ZH
LZ
ZL
V
V
CC
CC
V
FIGURE 4A. TEST CIRCUIT
FIGURE 5A. TEST CIRCUIT
FIGURE 6A. TEST CIRCUIT
FIGURE 7A. TEST CIRCUIT
CC
0V
RXEN
B
DEN
D
RXEN
A, B
Y, Z
A
RXEN
A
B
DEN
D
R
X
X
X
X
R
0
0
12
R
R
R
Y, Z
A,
A
R
R
A
B
FIGURE 5. RS-485 RECEIVER ENABLE AND DISABLE TIMES
+1.5V
+1.5V
+1.5V
-1.5V
-1.5V
-1.5V
R
FIGURE 4. RS-485 RECEIVER PROPAGATION DELAY
FIGURE 7. RS-232 RECEIVER PROPAGATION DELAY
L
B
FIGURE 6. RS-232 DRIVER PROPAGATION DELAY
15pF
(Continued)
1kΩ
15pF
C
C
L
L
= 15pF
SW
ISL81387, ISL41387
GND
GND
GND
V
V
V
SW
CC
CC
CC
GND
V
CC
SKEW = |t
SKEW = |t
OUT (Y, Z)
R
D
A, B
R
RXEN
A,
B
Y,Z
A
t
R
t
ZL(SHDN)
ZH(SHDN)
B
DPHL
RPHL
t
DPHL
FIGURE 4B. MEASUREMENT POINTS
FIGURE 5B. MEASUREMENT POINTS
FIGURE 6B. MEASUREMENT POINTS
FIGURE 7B. MEASUREMENT POINTS
t
R
t
R
ZH
ZL
A
A
- t
- t
DPLH
RPLH
t
t
PLH
|
RPHL
1.5V
1.3V
|
1.5V
0V
ENABLED
OUTPUT HIGH
1.5V
1.5V
0V
1.5V
OUTPUT LOW
0.8V
t
t
t
t
HZ
LZ
PHL
1.5V
1.5V
1.7V
RPLH
0V
V
V
OH
OL
0V
1.5V
2.4V
+ 0.5V
- 0.5V
t
November 21, 2007
+1.5V
-1.5V
3V
0V
DPLH
3V
0V
3V
0V
V
V
V
0V
V
OH
CC
OL
V
V
V
V
0V
CC
O+
OH
OL
FN6201.3
O-