Low-Power, Slew-Rate-Limited
RS-485/RS-422 Transceivers
MAX481/MAX483/MAX485/MAX487–MAX491/MAX1487
100pF
Z
TTL IN
t
R
, t
F
< 6ns
D
Y
R = 54Ω
A
B
R
RECEIVER
OUT
100pF
Figure 14. Receiver Propagation Delay Test Circuit
A
500mV/div
V
CC
= 5V
T
A
= +25°C
B
500mV/div
V
CC
= 5V
T
A
= +25°C
B
RO
A
2V/div
2V/div
RO
20ns/div
20ns/div
Figure 15. MAX481/MAX485/MAX490/MAX491/MAX1487
Receiver t
PHL
Figure 16. MAX481/MAX485/MAX490/MAX491/MAX1487
Receiver t
PLH
A
500mV/div
V
CC
= 5V
T
A
= +25°C
B
500mV/div
V
CC
= 5V
T
A
= +25°C
B
RO
2V/div
A
2V/div
RO
400ns/div
400ns/div
Figure 17. MAX483, MAX487–MAX489 Receiver t
PHL
Figure 18. MAX483, MAX487–MAX489 Receiver t
PLH
12
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
