MAX1480 Maxim, MAX1480 Datasheet - Page 14

• Manufacturer Part Number: MAX1480
• Description: Complete / Isolated RS-485/RS-422 Data Interface
• Manufacturer: Maxim

Complete, Isolated RS-485/RS-422
Data Interface
Figure 7. Driver Propagation Delays and Transition Times
Figure 9. Times to/from Shutdown
14
____________________________________________________Test Circuits (continued)
_______________________________________________________Switching Waveforms
SD
V
DI
V
CC_
0.8V
2.4V
A, B
A, B
V
´
DIFF
0V
OL
- 0.4V
______________________________________________________________________________________
-V
V
0V
0V
B
A
O
O
V
1.6V
V
1/2 V
O
CC_
t
R
10%
2
- 0.4V
O
2.3V
2.3V
t
t
ZL(SHDN)
ZH(SHDN)
90%
t
OUTPUT NORMALLY HIGH
OUTPUT NORMALLY LOW
PLH
V
t
SKEW =
DIFF
= V (A) - V (B)
t
PLH
- t
t
t
Figure 6. Driver Timing Test Load
SHDN
PHL
SHDN
t
PHL
t
F
90%
UNDER TEST
OUTPUT
V
1.6V
CC_
V
V
OL
OH
2
- 0.4V
10%
+ 0.5V
- 0.5V
1/2 V
O
C
L
500
Figure 8. Driver Enable and Disable Times
Figure 10. Receiver Propagation Delays
V
DE
V
CC_
A
´
RO
- V
RO V
A, B
A, B
V
-0.4V
0V
0V
B
OL
V
V
V
-V
V
OH
OH
OL
OL
ID
ID
V
CC_
S1
S2
2
- 0.4V
0V
ISO V
2.3V
2.3V
CC
t
1.5V
1.5V
t
ZH
_
ZL
OUTPUT NORMALLY HIGH
OUTPUT NORMALLY LOW
t
t
PHL
PLH
INPUT
MAX1480A/B/C
MAX1490A/B
OUTPUT
OUTPUT
t
SKEW
t
= t
t
HZ
LZ
PLH -
t
1.5V
1.5V
V
PHL
CC_
0V
V
V
2
- 0.4V
OL
OH
+ 0.5V
- 0.5V
t
t
PHL
PLH