SP1485E Datasheet, PDF (5/11 Pages) Sipex Corporation – Enhanced Low Power Half-Duplex RS-485 Transceivers

INPUTS
OUTPUTS
LINE
RE DE DI CONDITION B A
X 1 1 No Fault
01
X 1 0 No Fault
10
X0X
X
ZZ
X 1 X Fault
ZZ
Table 1. Transmit Function Truth Table
INPUTS
RE DE
0
0
0
0
0
0
1
0
OUTPUTS
A-B
R
+0.2V
1
-0.2V
0
Inputs Open
1
X
Z
Table 2. Receive Function Truth Table
+3V
DE
0V
5V
A, B
V_OL
V_OH
A, B
0V
f = 1MHz; t_R < 1.0ns; t_F < 1.0ns
1.5V
t_ZL
2.3V _{Output normally LOW}
1.5V
t_LZ
0.5V
2.3V ^{Output normally HIGH}
t_ZH
0.5V
t_HZ
Figure 6. Driver Enable and Disable Times
V_0D2⁺
A–B
V_0D2^–
0V
INPUT
0V
V_OH
R
V_OL
t_PHL
t_{SKEW = |} t_{PHL -} t_{PLH |}
Figure 7. Receiver Propagation Delays
1.5V
OUTPUT
t_PLH
f = 1MHz; t_R < 1.0ns; t_F < 1.0ns
1.5V
+3V
RE
0V
5V
R
V_IL
V_IH
R
0V
1.5V _{f = 1MHz; tR < 1.0ns; tF < 1.0ns}
t_ZL
1.5V _{Output normally LOW}
1.5V ^{Output normally HIGH}
t_ZH
Figure 8. Receiver Enable and Disable Times
1.5V
t_LZ
0.5V
0.5V
t_HZ
Rev:C Date: 02/26/04
SP1485E Low Power Half-Duplex RS485 Transceivers
5
© Copyright 2004 Sipex Corporation