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LTC1685
52Mbps, Precision Delay, RS485 Fail-Safe Transceiver
Linear Technology
LTC1685 Datasheet PDF : 12 Pages
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LTC1685
FU CTIO
Transmitting
INPUTS
RE
DE
X
1
X
1
X
0
X
1
TABLES
LINE
DI
CONDITION
1
No Fault
0
No Fault
X
X
X
Fault
OUTPUTS
B
A
0
1
1
0
Hi-Z
Hi-Z
±
10mA Current Source
Receiving
INPUTS
RE
DE
0
0
0
0
0
0
0
0
1
X
A–B
≥
300mV
≤
– 300mV
Inputs Open
Inputs Shorted Together
A = B = – 7V to 12V
X
OUTPUT
RO
1
0
1
1
Hi-Z
TEST CIRCUITS
A
R
V
OD
R
V
OC
B
1685 F01
Figure 1. Driver DC Test Load
3V
DE
A
DI
B
R
DIFF
A
C
L1
B
C
L2
RO
RE
15pF
1685 F03
Figure 3. Driver/Receiver Timing Test Circuit
TEST POINT
S1
RECEIVER
OUTPUT
C
L
15pF
1k
S2
1k
V
DD
1685 F02
Figure 2. Driver DC Test Load
OUTPUT
UNDER TEST
500
Ω
C
L
S1
V
DD
S2
1685 F04
Figure 4. Driver Timing Test Load #2
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