Datasheet

MAX1480E/MAX1490E
±15kV ESD-Protected, Isolated RS-485/RS-422
Data Interfaces
______________________________________________________________________________________ 13
Figure 6. Driver Timing Test Load
OUTPUT
UNDER TEST
500Ω
S1
S2
ISO V
CC
_
C
L
Figure 7. Driver Propagation Delays and Transition Times
DI´ 0
B
A
V
O
0
-V
O
V
O
t
PLH
1/2 V
O
10%
t
R
90%
90%
t
PHL
1/2 V
O
10%
t
F
V
DIFF
= V (A) - V (B)
V
DIFF
V
CC_
- 0.4V
V
CC_
- 0.4V
2
t
SKEW =
t
PLH
- t
PHL

V
CC_
- 0.4V
2
Figure 8. Driver Enable and Disable Times
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
0
A, B
V
OL
A, B
0
V
OL
+ 0.5V
V
CC_
- 0.4V
2
V
CC_
- 0.4V
2
V
CC_
-0.4V
V
OH
- 0.5V
2.3V
2.3V
t
ZL
t
LZ
t
ZH
t
HZ
DE´
Figure 9. Times to/from Shutdown
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
2.4V
0.8V
A, B
V
OL
A, B
0
1.6V 1.6V
V
OL
+ 0.5V
V
OH
- 0.5V
2.3V
2.3V
t
ZL(SHDN)
t
SHDN
t
ZH(SHDN)
t
SHDN
SD
Figure 10. Receiver Propagation Delays
V
OH
V
OL
-V
ID
V
ID
1.5V
0
1.5V
1.5V 1.5V
MAX1480EA/MAX1480EC
OUTPUT
MAX1490EA/MAX1490EB
OUTPUT
INPUT
0
RO
RO V
OH
V
OL
V
A
- V
B
t
PHL
t
PLH
t
PLH
t
PHL
t
SKEW
= t
PLH -
t
PHL

Switching Waveforms
____________________________________________________Test Circuits (continued)