LTC1321 LINER [Linear Technology], LTC1321 Datasheet - Page 12

• Manufacturer Part Number: LTC1321
• Description: RS232/EIA562/RS485 Transceivers
• Manufacturer: LINER [Linear Technology]

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