isl81387 Intersil Corporation, isl81387 Datasheet - Page 11

• 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 DEN L- H SIMULTANEOUSLY
SIGNAL
GENERATOR
PARAMETER OUTPUT
t
t
ZH(SHDN)
ZL(SHDN)
SIGNAL
GENERATOR
t
t
t
t
HZ
ZH
LZ
ZL
V
CC
DEN
D
FIGURE 2A. TEST CIRCUIT
FIGURE 3A. TEST CIRCUIT
DEN
DY
Y
Y/Z
Y/Z
Y/Z
Y/Z
Y/Z
Y/Z
FIGURE 2. RS-485 DRIVER PROPAGATION DELAY AND DIFFERENTIAL TRANSITION TIMES
D
D
Y
RXEN
Z
11
X
X
X
X
0
0
Y
Z
V
CC
C
L
R
FIGURE 3. RS-485 DRIVER ENABLE AND DISABLE TIMES
DY
0/1
1/0
0/1
1/0
0/1
1/0
FIGURE 1. RS-485 DRIVER V
DIFF
DEN
D
Y
500Ω
GND
GND
GND
V
V
V
SW
C
D
C
CC
CC
CC
L
L
= 100pF
= 100pF
SW
ISL81387, ISL41387
Y
Z
C
L
100
100
100
100
GND
V
15
15
(pF)
CC
R
D
OD
V
OD
AND V
SKEW = |t
DIFF OUT (Z - Y)
OUT (Y)
OUT (Z)
OC
D
R
R
DEN
OUT (Y, Z)
OUT (Y, Z)
Y
t
ZL(SHDN)
t
TEST CIRCUIT
ZH(SHDN)
PLH
FIGURE 2B. MEASUREMENT POINTS
FIGURE 3B. MEASUREMENT POINTS
(Y OR Z) - t
t
t
ZH
ZL
V
OC
t
10%
R
90%
t
t
t
DLH
1.5V
PLH
PHL
1.5V
PHL
+
-
V
OUTPUT HIGH
ENABLED
(Z OR Y)|
50%
CM
50%
0V
2.3V
2.3V
OUTPUT LOW
t
t
t
0V
PHL
1.5V
PLH
DHL
t
t
HZ
LZ
1.5V
90%
50%
50%
V
V
10%
OH
OL
November 21, 2007
t
F
+ 0.5V
- 0.5V
3V
0V
3V
0V
+V
-V
V
V
V
V
OH
OL
OH
OL
FN6201.3
V
V
V
OD
OD
0V
OH
CC
OL