Datasheet

12
LTC1321/LTC1322/LTC1335
Figure 7. RS485 Driver Propagation Delays
Figure 9. RS485 Receiver Propagation Delays
0V
V
OD2
A – B
f = 1MHz: t
r
≤ 10ns: t
f
≤ 10ns
1.5V
R
V
OL
V
OH
1321/22/35 F09
t
PLH
t
PHL
INPUT
–V
OD2
OUTPUT
0V
1.5V
3V
D
Y OR Z
–V
O
V
O
1321/22/35 F10
t
PHL
t
PLH
0V
0V
0V
1.5V
1.5V
1.5V
3V
0V
D
f = 1MHz: t
r
≤ 10ns: t
f
≤ 10ns
1.5V
Y – Z
–V
O
V
O
t
SKEW
1/2 V
O
1321/22/35 F07
t
PLH
t
r
90%
50%
10%
t
PHL
t
f
90%
50%
10%
V
O
t
SKEW
V
DIFF
= V(Y) – V(Z)
Z
Y
SWITCHI G WAVEFOR S
U
W
Figure 10. EIA/TIA-562 Driver Propagation Delays
1.5V
3V
0V
DE
f = 1MHz: t
r
≤ 10ns: t
f
≤ 10ns
1.5V
Y OR Z
V
OL
5V
t
ZL
t
LZ
0.5V
OUTPUT NORMALLY LOW
0V
1321/22/35 F08
2.3V
2.3V
t
ZH
V
OH
OUTPUT NORMALLY HIGH
t
HZ
0.5V
Y OR Z
Figure 8. RS485 Driver Enable and Disable Times