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LTC2870 Datasheet(PDF) 14 Page - Linear Technology

Part # LTC2870
Description  RS232/RS485 Multiprotocol Transceivers with Integrated Termination
PDF  36 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC2870 Datasheet(HTML) 14 Page - Linear Technology

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LTC2870/LTC2871
14
28701f
TEST CIRCUITS
Figure 5. RS485 Driver Enable and Disable Timing Measurements
Figure 6. RS485 Receiver Propagation Delay Measurements (Note 5)
Figure 7. RS485 Receiver Enable and Disable Timing Measurements (Note 5)
28701 F05
tZLD485,
tZLSD485
tLZD485
tHZD485
tZHD485,
tZHSD485
½VCC
½VCC
VL
VOL
VCC
VOH
0V
0V
0.5V
DXEN/
DX485
Y OR Z
Z OR Y
DRIVER
DY/DI
DXEN/DX485
VL
OR
GND
Y
RL
Z
GND
OR
VCC
VCC
OR
GND
RL
CL
CL
½VL
0.5V
½VL
28701 F06
RECEIVER
VCM
±VAB/2
A
B
RA/RO
±VAB/2
CL
tPLHR485
tSKEWR485 = tPLHR485 – tPHLR485
tRR485
90%
0V
½VL
A-B
RA/RO
10%
tPHLR485
tFR485
90%
0V
–VAB
VAB
½VL
10%
VL
28701 F07
tZLR485
tLZR485
tHZR485
tZHR485
½VL
½VL
VL
VOL
VL
VOH
0V
0V
0.5V
RXEN/
RX485
RA/RO
RA/RO
RECEIVER
RA/RO
RXEN/RX485
0V TO 3V
3V TO 0V
A
RL
B
VL
OR
GND
CL
½VL
0.5V
½VL



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