adm2485 Analog Devices, Inc., adm2485 Datasheet - Page 10

• Manufacturer Part Number: adm2485
• Description: High Speed Isolated Rs-485 Transceiver With Integrated Transformer Driver
• Manufacturer: Analog Devices, Inc.

ADM2485
SWITCHING CHARACTERISTICS
–VO
A – B
VO
RxD
3V
0V
0V
B
A
VO
10% POINT
1/2VO
Figure 12. Driver Propagation Delay, Rise/Fall Timing
90% POINT
t
PLH
0V
t
PLH
Figure 13. Receiver Propagation Delay
1.5V
t
R
1.5V
t
SKEW
t
SKEW
= |t
PLH
= |t
– t
PLH
PHL
– t
|
PHL
1.5V
t
PHL
|
0V
t
PHL
1.5V
90% POINT
t
F
10% POINT
V
V
OL
OH
Rev. 0 | Page 10 of 20
A – B
A – B
RTS
RxD
RxD
RE
0V
Figure 15. Receiver Enable/Disable Timing
t
t
t
0.5V
t
Figure 14. Driver Enable/Disable Timing
0.5V
ZL
ZH
ZH
ZL
DD1
DD1
1.5V
1.5V
2.3V
2.3V
O/P HIGH
O/P LOW
t
t
t
t
LZ
HZ
LZ
HZ
0.5V
0.5V
V
V
DD1
V
DD1
V
OH
OH
OH
OH
– 0.5V
+ 0.5V
– 0.5V
+ 0.5V
0.7V
0.3V
0.7V
0.3V
DD1
DD1
V
DD1
DD1
V
OH
V
OL
V
OH
OL
0V