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LTC2854 Datasheet(PDF) 6 Page - Linear Technology

Part # LTC2854
Description  3.3V 20Mbps RS485/RS422 Transceivers with Integrated Switchable Termination
Download  16 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC2854 Datasheet(HTML) 6 Page - Linear Technology

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LTC2854/LTC2855
6
285455fb
Figure 6. Receiver Propagation Delay Measurements
Figure 7. Receiver Enable and Disable Timing Measurements
A
B
VCM
±VAB/2
±VAB/2
RO
CL
285455 F06a
RECEIVER
tPLHR
tPHLR
90%
0
tSKEWR = tPLHR – tPHLR
90%
1/2 VCC
1/2 VCC
tRR
tFR
tR
tF
10%
90%
10%
90%
10%
285455 F06b
10%
VAB
VCC
VO
0
–VAB
RO
A-B
A
B
0V OR VCC
VCC OR 0V
DI = 0V OR VCC
RO
RE
CL
RL
VCC
OR
GND
285455 F07a
RECEIVER
tZLR,
tZLSR
tZHR,
tZHSR
tHZR
tLZR
1/2 VCC
1/2 VCC
1/2 VCC
RE
RO
RO
VCC
VCC
VOL
VO
VOH
0V
0V
0.5V
0.5V
285455 F07b
tRTEN
tRTZ
VCC
B
A
IA
TE
285455 F08
RECEIVER
90%
10%
0V
TE
+
+
VAB
VB
RTERM =
IA
IA
VAB
1/2 VCC
RO
Figure 8. Termination Resistance and Timing Measurements
TEST CIRCUITS


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