Datasheet

MAX3157
High CMRR RS-485 Transceiver
with ±50V Isolation
8 _______________________________________________________________________________________
DI
3V
0
Z
Y
V
O
0
-V
O
V
O
1.5V
t
DPLH
1/2 V
O
10%
t
DR
90%
90%
t
DPHL
1.5V
1/2 V
O
10%
t
DF
V
DIFF
= V (Y) - V (Z)
V
DIFF
t
DSKEW = |
t
DPLH
- t
DPHL |
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
3V
0
Y, Z
V
OL
Y, Z
0
1.5V 1.5V
V
OL
+ 0.5V
V
OH
- 0.5V
2.3V
2.3V
t
DZL(SHDN)
, t
DZL
t
DLZ
t
DZH(SHDN)
, t
DZH
t
DHZ
DE
Figure 5. Driver Propagation Delays
Figure 6. Driver Enable and Disable Times
V
OH
V
OL
A
B
1V
-1V
1.5V 1.5V
OUTPUT
INPUT
RO
t
RPLH
t
RPHL
t
RSKEW = |
t
RPLH
- t
RPHL |
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
3V
0
V
CC
RO
RO
0
1.5V 1.5V
V
OL
+ 0.5V
V
OH
- 0.5V
1.5V
1.5V
t
RZL(SHDN)
, t
RZL
t
RLZ
t
RZH(SHDN)
, t
RZH
t
RHZ
RE
Figure 7. Receiver Propagation Delays
Figure 8. Receiver Enable and Disable Times
R
B
RECEIVER
OUTPUT
ATE
A
V
ID
R
Figure 9. Receiver Propagation Delay Test Circuit
Test Circuits and Timing Diagrams (continued)