sp485een-tr Exar Corporation, sp485een-tr Datasheet - Page 5

• Manufacturer Part Number: sp485een-tr
• Description: Sp485e -enhanced Low Emi Half-duplex Rs-485 Transceiver
• Manufacturer: Exar Corporation

Table 1. Transmit Function Truth Table
Figure 8. Receiver Enable and Disable Times
May11-2007
Figure 6. Driver Enable and Disable Times
Figure 7. Receiver Propagation Delays
RE
X
X
X
X
RE
INPUTS
R
R
DE
+3V
A, B
A, B
1
1
0
1
V
V
DE
0V
5V
0V
IH
IL
A – B
t
SKEW =
DI CONDITION
V
+3V
V
X
X
1
0
R
0V
5V
0V
OH
OL
V
V
0D2
0D2
V
V
| t
OH
OL
PHL -
No Fault
No Fault
+
–
LINE
Fault
X
t
PLH
t
PHL
|
1.5V
1.5V
1.5V
SP481E Low Power Half-Duplex RS485 Transceivers
OUTPUTS
1.5V
t
2.3V
2.3V
t
ZH
B
Z
Z
f = 1MHz; t
0
1
ZL
0V
f = 1MHz; t
t
1.5V
t
ZH
ZL
f = 1MHz; t
Output normally HIGH
Output normally LOW
A
Z
Z
1
0
Output normally HIGH
Output normally LOW
5
R
R
R
OUTPUT
< 10ns; t
< 10ns; t
INPUT
Table 2. Receive Function Truth Table
< 10ns; t
RE
0
0
0
1
INPUTS
F
F
F
< 10ns
< 10ns
< 10ns
t
PLH
DE
0
0
0
0
Inputs Open
0V
© 2007 Sipex Corporation
A - B
+0.2V
1.5V
-0.2V
1.5V
1.5V
0.5V
0.5V
0.5V
0.5V
X
t
t
t
t
HZ
HZ
LZ
LZ
OUTPUTS
R
Z
1
0
1