±15kV ESD-Protected, Slew-Rate-Limited,
Low-Power, RS-485/RS-422 Transceivers
MAX481E/MAX483E/MAX485E/MAX487E–MAX491E/MAX1487E
3V
DE
DI
Y
V
ID
Z
C
L2
C
L1
R
DIFF
A
RO
B
RE
500Ω
OUTPUT
UNDER TEST
C
L
S2
S1
V
CC
Figure 10. Driver/Receiver Timing Test Circuit
Figure 11. Driver Timing Test Load
3V
DI
0V
1.5V
t
PLH
t
PHL
1.5V
1/2 V
O
3V
DE
0V
t
ZL(SHDN)
, t
ZL
Y, Z
V
O
V
OL
V
DIFF
= V (Y) - V (Z)
90%
90%
t
F
t
SKEW =
| t
PLH
- t
PHL
|
10%
Y, Z
2.3V
0V
t
ZH(SHDN)
, t
ZH
t
HZ
2.3V OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
V
OH
-0.5V
V
OL
+0.5V
t
LZ
1.5V
1.5V
Z
Y
1/2 V
O
V
O
V
DIFF
0V
-V
O
10%
t
R
Figure 12. Driver Propagation Delays
Figure 13. Driver Enable and Disable Times (except MAX488E
and MAX490E)
3V
RE
0V
RO
V
OH
V
OL
V
ID
-V
ID
0V
1.5V
t
PHL
INPUT
OUTPUT
t
PLH
0V
RO
0V
t
ZH(SHDN)
, t
ZH
t
HZ
1.5V
1.5V
V
CC
RO
t
ZL(SHDN)
, t
ZL
t
LZ
V
OL
+ 0.5V
1.5V
1.5V
1.5V OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
A-B
V
OH
- 0.5V
Figure 14. Receiver Propagation Delays
Figure 15. Receiver Enable and Disable Times (except MAX488E
and MAX490E)
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11
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
