adm2491e Analog Devices, Inc., adm2491e Datasheet - Page 9

• Manufacturer Part Number: adm2491e
• Description: High Speed, Esd-protected, Half-/full-duplex, Icoupler Isolated Rs-485 Transceiver
• Manufacturer: Analog Devices, Inc.

V
SWITCHING CHARACTERISTICS
V
TxD
Y, Z
V
DD1
0V
OH
OL
Z
Y
V
Y, Z
Y, Z
OUT
DE
10% POINT
1/2V
90% POINT
Figure 10. Driver Propagation Delay, Rise/Fall Timing
OUT
0.5V
t
t
ZL
ZH
t
PLH
DD1
Figure 11. Driver Enable/Disable Delay
1.5V
t
R
2.3V
2.3V
t
PWD
= |
t
PLH
–
t
t
t
LZ
HZ
PHL
0.5V
1.5V
|
DD1
V
V
OH
OL
– 0.5V
+ 0.5V
t
PHL
t
90% POINT
F
10% POINT
V
0V
V
V
0V
DD1
OL
OH
Rev. 0 | Page 9 of 16
A, B
RxD
RxD
RxD
RE
0V
0.5V
t
t
t
ZL
ZH
PLH
0V
Figure 13. Receiver Enable/Disable Delay
Figure 12. Receiver Propagation Delay
DD1
1.5V
1.5V
1.5V
OUTPUT HIGH
OUTPUT LOW
t
t
LZ
HZ
0.5V
DD1
V
V
t
OH
OL
PHL
0V
– 0.5V
+ 0.5V
ADM2491E
1.5V
V
0V
V
V
0V
DD1
OL
OH
V
V
OL
OH