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LTC1687_15 Datasheet, PDF (7/12 Pages) Linear Technology – 52Mbps Precision Delay RS485 Fail-Safe Transceivers
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UW
W
SWITCHI G TI E WAVEFOR S
LTC1686/LTC1687
3V
D
0V
Z
Y
VO
0V
– VO
1.5V
f = 1MHz, t r ≤ 3ns, t f ≤ 3ns
t PLH
VO
1/2 VO
10%
tr
tSKEW
90%
VDIFF = V(Y) – V(Z)
1.5V
tPHL
1/2 VO
t SKEW
90%
10%
tf
1686/87 F05
Figure 5. Driver Propagation Delays
3V
DE
0V
5V
Y, Z
VOL
VOH
Y, Z
0V
VOH
R
VOL
VOD2
A–B
– VOD2
1.5V
f = 1MHz, tr ≤ 3ns, tf ≤ 3ns
t ZL
t LZ
2.5V
OUTPUT NORMALLY LOW
1.5V
0.5V
2.5V
OUTPUT NORMALLY HIGH
0.5V
t ZH
t HZ
Figure 6. Driver Enable and Disable Times
2.5V
OUTPUT
2.5V
t PHL
f = 1MHz, tr ≤ 3ns, tf ≤ 3ns t PLH
0V
INPUT
Figure 7. Receiver Propagation Delays
1686/87 F06
1686/87 F07
3V
RE
0V
5V
R
R
0V
1.5V
f = 1MHz, t r ≤ 3ns, t f ≤ 3ns
t ZL
t LZ
2.5V
OUTPUT NORMALLY LOW
1.5V
0.5V
2.5V
OUTPUT NORMALLY HIGH
0.5V
t ZH
t HZ
Figure 8. Receiver Enable and Disable Times
1686/87 F08
7
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