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