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LTC488 Datasheet(PDF) 6 Page - Linear Technology

Part # LTC488
Description  Quad RS485 Line Receiver
Download  12 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC488 Datasheet(HTML) 6 Page - Linear Technology

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LTC488/LTC489
6
4889fb
TEST CIRCUITS
SWITCHING TIME WAVEFORMS
Figure 1. Receiver Timing Test Circuit
Note: The input pulse is supplied by a generator having the following characteristics:
f = 1MHz, Duty Cycle = 50%, tr < 10ns, tf ≤ 10ns, ZOUT = 50Ω
Figure 2. Receiver Enable and Disable Timing Test Circuit
D
4889 F01
DRIVER
RECEIVER
CL
RO
A
B
54Ω
100pF
100pF
1k
4889 F02
CL
S1
S2
1k
VCC
RECEIVER
OUTPUT
0V
–VOD2
tPHL
f = 1MHz; tr ≤ 10ns; tf ≤ 10ns
0V
tPLH
VOD2
INPUT
A, B
VOH
1.5V
1.5V
VOL
RO
INPUT
4889 F03
f = 1MHz; tr ≤ 10ns; tf ≤ 10ns
1.5V
RO
4889 F04
0V
3V
1.5V
tZL
VOL
VOH
1.5V
tLZ
0.5V
0.5V
tHZ
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
0V
5V
1.5V
tZH
RO
EN OR
EN12
Figure 3. Receiver Propagation Delays
Figure 4. Receiver Enable and Disable Times


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