LT1785A データシートの表示（PDF） - Linear Technology
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LT1785A Datasheet PDF : 16 Pages
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LT1785/LT1785A/
LT1791/LT1791A
TEST CIRCUITS
A
VOD
B
R
R
VOC
1785/91 F01
Figure 1. Driver DC Test Load
RECEIVER
OUTPUT
TEST POINT
S1
CRL
1k
S2
1k
VCC
1785/91 F02
Figure 2. Receiver Timing Test Load
5V
DE
A
DI
B
RDIFF
A
CL1
RO
B
CL2
RE
15pF
Figure 3. Driver/Receiver Timing Test Circuit
1785/91 F03
OUTPUT
UNDER TEST
500Ω
CL
S1
VCC
S2
1785/91 F04
Figure 4. Driver Timing Test Load
FUNCTION TABLES
LT1785 Transmitting
INPUTS
RE
DE
DI
0
1
0
0
1
1
1
0
X
1
1
0
1
1
1
OUTPUTS
A
B
RO
0
1
0
1
0
1
Hi-Z
Hi-Z
Hi-Z
0
1
Hi-Z
1
0
Hi-Z
LT1785 Receiving
INPUTS
RE
DE
DI
0
0
X
0
0
X
0
0
X
1
0
X
* ≥ 0mV for LT1785A
A-B
≤ –200mV
≥ 200mV*
Open
X
OUTPUT
RO
0
1
1
Hi-Z
LT1791
INPUTS
RE
DE
DI
0
0
X
0
0
X
0
0
X
0
1
0
0
1
0
0
1
0
0
1
1
0
1
1
0
1
1
1
0
X
1
1
0
1
1
1
* ≥ 0mV for LT1791A
A-B
≤ –200mV
≥ 200mV*
Open
≤ –200mV
≥ 200mV*
Open
≤ –200mV
≥ 200mV*
Open
X
X
X
OUTPUTS
Y
Z
RO
Hi-Z Hi-Z
0
Hi-Z Hi-Z
1
Hi-Z Hi-Z
1
0
1
0
0
1
1
0
1
1
1
0
0
1
0
1
1
0
1
Hi-Z Hi-Z Hi-Z
0
1
Hi-Z
1
0
Hi-Z
178591fb
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