f = 1MHz; t < 10ns; t < 10ns
R
F
+3V
0V
1.5V
1.5V
DI
t
t
PHHLL
PLLHH
B
A
+
1/2V
1/2V
O
O
DDRIVER
OUTPUT
V
O
t
t
DPPLLHH
DPPHHLL
DDIFFERENTIAL
OUTPUT
V
V
O
0V
–
V
– V
O
A
B
t
t
F
R
t
t
t
SKKEEWW == | DPPLLHH -- DPPHHLL |
Figure 6. Driver Propagation Delays
f = 1MHz; tR < 10ns; tF < 10ns
1.5V
+3V
DE
1.5V
0V
tZL
2.3V
tLZ
5V
A, B
Output normally LOW
Output normally HIGH
0.5V
0.5V
VOL
VOH
A, B
2.3V
tZH
0V
tHZ
Figure 7. Driver Enable and Disable Times SP1491E only
+
–
V
V
0D2
0V
0V
A – B
R
INPUT
0D2
V
OH
1.5V
1.5V
OUTPUT
V
OL
t
t
PLH
PHL
f = 1MHz; t < 10ns; t < 10ns
R
F
t
t t
| PHL - PLH |
SKEW =
Figure 8. Receiver Propagation Delays
Date: 5/18/04
SP1490E/1491E Full Duplex RS-485 Transceivers
© Copyright 2004 Sipex Corporation
4
SIPEX [ SIPEX CORPORATION ]
