RS485 Просмотр технического описания (PDF) - Linear Technology
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RS485 Datasheet PDF : 20 Pages
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LTC1321/LTC1322/LTC1335
U
W
SWITCHI G WAVEFOR S
3V
D
0V
VO
Y–Z
–VO
Z
Y
1.5V
f = 1MHz: tr ≤ 10ns: tf ≤ 10ns
1.5V
tPLH
90%
50%
10%
tr
VDIFF = V(Y) – V(Z)
1/2 VO
tPHL
90%
50%
10%
tf
VO
tSKEW
Figure 7. RS485 Driver Propagation Delays
tSKEW 1321/22/35 F07
3V
DE
0V
5V
Y OR Z
VOL
VOH
Y OR Z
0V
1.5V
f = 1MHz: tr ≤ 10ns: tf ≤ 10ns
1.5V
tZL
tLZ
2.3V
OUTPUT NORMALLY LOW
0.5V
tZH
tHZ
OUTPUT NORMALLY HIGH
0.5V
2.3V
Figure 8. RS485 Driver Enable and Disable Times
1321/22/35 F08
V OD2
A–B
–V OD2
VOH
R
VOL
3V
D
0V
VO
Y OR Z
–VO
0V f = 1MHz: tr ≤ 10ns: tf ≤ 10ns INPUT
0V
tPLH
1.5V
OUTPUT
tPHL
1.5V
Figure 9. RS485 Receiver Propagation Delays
1321/22/35 F09
1.5V
tPHL
0V
1.5V
tPLH
0V
1321/22/35 F10
Figure 10. EIA/TIA-562 Driver Propagation Delays
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