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LTC1685 Datasheet, PDF (7/12 Pages) Linear Technology – 52Mbps, Precision Delay, RS485 Fail-Safe Transceiver
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UW
W
SWITCHI G TI E WAVEFOR S
3V
DI
0V
B
A
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(A) – V(B)
1.5V
t PHL
1/2 VO
t SKEW
90%
10%
tf
Figure 5. Driver Propagation Delays
LTC1685
1586 F05
3V
DE
0V
5V
A, B
VOL
VOH
A, B
0V
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
1686 F06
Figure 6. Driver Enable and Disable Times
VOH
RO
VOL
VOD2
A–B
– VOD2
2.5V
OUTPUT
2.5V
t PHL
f = 1MHz, tr ≤ 3ns, tf ≤ 3ns t PLH
0V
INPUT
1686 F07
Figure 7. Receiver Propagation Delays
3V
RE
0V
5V
RO
RO
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
1685 F08
7
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