ISL81487 Intersil Corporation, ISL81487 Datasheet - Page 7

• Manufacturer Part Number: ISL81487
• Description: 1/8 Unit Load, 5v, Low Power, High Speed or Slew Rate Limited, Rs-485/rs-422 Transceivers
• Manufacturer: Intersil Corporation

Test Circuits and Waveforms
(SHDN) for ISL8487 and ISL81483 only.
SIGNAL
GENERATOR
PARAMETER OUTPUT
t
t
ZH(SHDN)
ZL(SHDN)
SIGNAL
GENERATOR
t
t
t
t
HZ
ZH
LZ
ZL
V
SIGNAL
GENERATOR
CC
DE
DI
+1.5V
FIGURE 2A. TEST CIRCUIT
FIGURE 3A. TEST CIRCUIT
FIGURE 4A. TEST CIRCUIT
DE
DI
Y/Z
Y/Z
Y/Z
Y/Z
Y/Z
Y/Z
D
B
A
FIGURE 2. DRIVER PROPAGATION DELAY AND DIFFERENTIAL TRANSITION TIMES
0 (Note 5)
0 (Note 5)
1 (Note 7)
1 (Note 7)
RE
D
Y
Z
RE
X
X
7
Y
Z
R
C
RO
L
R
1/0
0/1
1/0
0/1
1/0
0/1
DI
DIFF
FIGURE 3. DRIVER ENABLE AND DISABLE TIMES
(Continued)
500Ω
FIGURE 4. RECEIVER PROPAGATION DELAY
15pF
ISL8487, ISL81483, ISL81487
GND
GND
GND
V
V
V
SW
C
C
CC
CC
CC
L
L
= 100pF
= 100pF
SW
C
L
100
100
100
100
GND
15
15
V
(pF)
CC
DIFF OUT (Y - Z)
SKEW = |t
OUT (Y, Z)
OUT (Y, Z)
OUT (Y)
OUT (Z)
t
t
ZH
ZL
RO
A
DI
NOTE 7
DE
, t
, t
NOTE 7
ZH(SHDN)
ZL(SHDN)
PLH
NOTE 7
FIGURE 2B. MEASUREMENT POINTS
FIGURE 3B. MEASUREMENT POINTS
FIGURE 4B. MEASUREMENT POINTS
(Y or Z) - t
t
10%
R
t
90%
1.5V
PLH
t
t
1.5V
PLH
PHL
1.5V
PHL
OUTPUT HIGH
50%
(Z or Y)|
50%
50%
2.3V
2.3V
OUTPUT LOW
t
PHL
t
t
1.5V
PHL
PLH
t
1.5V
t
HZ
1.5V
LZ
50%
90%
V
50%
V
50%
OH
10%
OL
t
- 0.5V
+ 0.5V
F
3V
0V
3V
0V
3V
0V
V
+V
-V
0V
V
V
V
V
CC
V
V
V
OH
OL
OH
OL
0V
OD
OD
OH
CC
OL