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LT1785HN8-PBF Datasheet(PDF) 8 Page - Linear Technology

Part # LT1785HN8-PBF
Description  60V Fault Protected RS485/RS422 Transceivers
Download  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT1785HN8-PBF Datasheet(HTML) 8 Page - Linear Technology

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LT1785/LT1785A/
LT1791/LT1791A
8
178591fb
TEST CIRCUITS
Figure 1. Driver DC Test Load
Figure 2. Receiver Timing Test Load
Figure 3. Driver/Receiver Timing Test Circuit
Figure 4. Driver Timing Test Load
VOD
A
B
R
R
VOC
1785/91 F01
RECEIVER
OUTPUT
CRL
1k
S1
S2
TEST POINT
VCC
1k
1785/91 F02
5V
DE
A
B
DI
RDIFF
CL1
CL2
RO
15pF
A
B
RE
1785/91 F03
OUTPUT
UNDER TEST
CL
S1
S2
VCC
500Ω
1785/91 F04
LT1785 Transmitting
INPUTS
OUTPUTS
RE
DE
DI
A
B
RO
01
0
0
1
0
01
1
1
0
1
1
0
X
Hi-Z
Hi-Z
Hi-Z
1
1
0
0
1
Hi-Z
1
1
1
1
0
Hi-Z
LT1785 Receiving
INPUTS
OUTPUT
RE
DE
DI
A-B
RO
0
0
X
≤ –200mV
0
0
0
X
≥ 200mV*
1
0
0
X
Open
1
1
0
X
X
Hi-Z
* ≥ 0mV for LT1785A
LT1791
INPUTS
OUTPUTS
RE
DE
DI
A-B
Y
Z
RO
0
0
X
≤ –200mV
Hi-Z
Hi-Z
0
0
0
X
≥ 200mV*
Hi-Z
Hi-Z
1
0
0
X
Open
Hi-Z
Hi-Z
1
0
1
0
≤ –200mV
0
1
0
0
1
0
≥ 200mV*
0
1
1
0
1
0
Open
0
1
1
0
1
1
≤ –200mV
1
0
0
0
1
1
≥ 200mV*
1
0
1
0
1
1
Open
1
0
1
1
0
X
X
Hi-Z
Hi-Z
Hi-Z
1
1
0
X
0
1
Hi-Z
1
1
1
X
1
0
Hi-Z
* ≥ 0mV for LT1791A
FUNCTION TABLES


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