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LTC1685 Datasheet(PDF) 6 Page - Linear Technology

Part # LTC1685
Description  52Mbps, Precision Delay, RS485 Fail-Safe Transceiver
PDF  12 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC1685 Datasheet(HTML) 6 Page - Linear Technology

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LTC1685
FU CTIO TABLES
Transmitting
INPUTS
LINE
OUTPUTS
RE
DE
DI
CONDITION
B
A
X
1
1
No Fault
0
1
X
1
0
No Fault
1
0
X
0
X
X
Hi-Z
Hi-Z
X
1
X
Fault
Receiving
INPUTS
OUTPUT
RE
DE
A – B
RO
00
≥ 300mV
1
00
≤ – 300mV
0
0
0
Inputs Open
1
0
0
Inputs Shorted Together
1
A = B = – 7V to 12V
1
X
X
Hi-Z
±10mA Current Source
TEST CIRCUITS
VOD
A
B
R
R
VOC
1685 F01
Figure 1. Driver DC Test Load
RECEIVER
OUTPUT
CL
15pF
1k
S1
S2
TEST POINT
VDD
1k
1685 F02
Figure 2. Driver DC Test Load
OUTPUT
UNDER TEST
CL
S1
S2
VDD
500
Ω
1685 F04
Figure 3. Driver/Receiver Timing Test Circuit
Figure 4. Driver Timing Test Load #2
3V
DE
A
B
DI
RDIFF
CL1
CL2
RO
15pF
A
B
RE
1685 F03



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