20µA,
1
⁄
8
-Unit-Load, Slew-Rate-Limited
RS-485 Transceivers
_______________________________________________________Switching Waveforms
MAX1482/MAX1483
3V
DI
0V
1.5V
t
PLH
t
PHL
1.5V
1/2 V
O
3V
DE
0V
t
ZL(SHDN)
, t
ZL
t
LZ
V
OL
+ 0.5V
1.5V
1.5V
Z
V
O
Y
1/2 V
O
V
O
V
DIFF
0V
-V
O
10%
t
R
t
SKEW =
| t
PLH
- t
PHL
|
V
DIFF
= V (Y) - V (Z)
90%
90%
t
F
10%
Y, Z
V
OL
Y, Z
2.3V
0V
t
ZH(SHDN)
, t
ZH
t
HZ
2.3V OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
V
OH
- 0.5V
Figure 5. Driver Propagation Delays
Figure 6. Driver Enable and Disable Times
3V
RE
0V
RO
V
OH
V
OL
V
ID
-V
ID
0V
1.5V
t
PHL
INPUT
OUTPUT
t
PLH
0V
OUTPUT NORMALLY HIGH
RO
0V
t
ZH(SHDN)
, t
ZH
t
HZ
1.5V
V
OH
- 0.5V
1.5V
t
ZL(SHDN)
, t
ZL
V
CC
RO
t
LZ
V
OL
+ 0.5V
1.5V
1.5V
1.5V OUTPUT NORMALLY LOW
A-B
Figure 7. Receiver Propagation Delays
Figure 8. Receiver Enable and Disable Times
_______________________________________________________________________________________
7
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
