3 .3 V-P o w e re d , 1 0 Mb p s a n d S le w -Ra t e -Lim it e d
Tru e RS -4 8 5 /RS -4 2 2 Tra n s c e ive rs
B
1V/div
DI
2V/div
A
1V/div
Z
1V/div
RO
Y
2V/div
1V/div
20ns/div
20ns/div
Figure 15. MAX3485/MAX3490/MAX3491 Driver Propagation
Delay
Figure 16. MAX3485/MAX3490/MAX3491 Receiver
Propagation Delay Driven by External RS-485 Device
B
1V/div
DI
2V/div
A
1V/div
Z
1V/div
Y
1V/div
RO
2V/div
1µs/div
1µs/div
Figure 17. MAX3483/MAX3488 Driver Propagation Delay
Figure 18. MAX3483/MAX3488 Receiver Propagation Delay
DI
DI
5V/div
5V/div
V - V
Y
Z
V - V
Y
Z
2V/div
2V/div
RO
RO
5V/div
5V/div
2µs/div
2µs/div
Figure 19. MAX3483/MAX3488 System Differential Voltage at
125kHz Driving 4000 ft of Cable
Figure 20. MAX3485/MAX3490/MAX3491 System Differential
Voltage at 125kHz Driving 4000 ft of Cable
5680/MAX3491
12 ______________________________________________________________________________________
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
