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LT1791CS 数据表(PDF) 7 Page - Linear Technology

部件名 LT1791CS
功能描述  60V Fault Protected RS485/RS422 Transceivers
PDF  12 Pages
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制造商  LINER [Linear Technology]
网页  http://www.linear.com
标志 LINER - Linear Technology

LT1791CS 数据表(HTML) 7 Page - Linear Technology

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7
LT1785/LT1785A
LT1791/LT1791A
FU CTIO TABLES
Figure 3. Driver/Receiver Timing Test Circuit
Figure 4. Driver Timing Test Load
5V
DE
A
B
DI
RDIFF
CL1
CL2
RO
15pF
A
B
RE
1785/91 F03
OUTPUT
UNDER TEST
CL
S1
S2
VCC
500
Ω
1785/91 F04
LT1785 Transmitting
INPUTS
OUTPUTS
RE
DE
DI
A
B
RO
0100
1
0
0111
0
1
1
0
X
Hi-Z
Hi-Z
Hi-Z
1100
1
Hi-Z
1111
0
Hi-Z
LT1785 Receiving
INPUTS
OUTPUT
RE
DE
DI
A-B
RO
00
X
≤–200mV
0
00
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
00
X
≤ –200mV
Hi-Z
Hi-Z
0
00
X
≥200mV*
Hi-Z
Hi-Z
1
0
0
X
Open
Hi-Z
Hi-Z
1
01
0
≤ –200mV
0
1
0
01
0
≥200mV*
0
1
1
0
1
0
Open
0
1
1
01
1
≤ –200mV
1
0
0
01
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
TEST CIRCUITS
Figure 5. Driver Propagation Delays
DI
5V
1.5V
tPLH
tr
tSKEW
1/2 VO
VO
f = 125kHz, tr ≤ 10ns, tf ≤ 10ns
90%
10%
0V
B
A
VO
–VO
0V
90%
1.5V
tPHL
tSKEW
1/2 VO
10%
tf
VDIFF = V(A) – V(B)
1785/91 F05
SWITCHI G TI E WAVEFOR S



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