LTC1387 View Datasheet(PDF) - Linear Technology
Part Name
Description
Manufacturer
LTC1387 Datasheet PDF : 12 Pages
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LTC1387
U
W
SWITCHI G WAVEFOR S
3V
D
0V
VO
Z–Y
–VO
Y
Z
f = 1MHz: t r ≤ 10ns: tf ≤ 10ns (FAST SLEW RATE MODE)
f = 100kHz: t r ≤ 10ns: tf ≤ 10ns (SLOW SLEW RATE MODE)
1.5V
1.5V
tPLH
90%
50%
10%
tr
VDIFF = V(A) – V(B)
1/2 VO
tPHL
90%
50%
10%
tf
VO
tSKEW
Figure 7. RS485 Driver Propagation Delays
tSKEW LTC1387 • F07
3V
DXEN
0V
5V
Y, Z
VOL
VOH
Z, Y
0V
VOD2
B–A
–VOD2
VOH
R
VOL
f = 1MHz: t r ≤ 10ns: tf ≤ 10ns (FAST SLEW RATE MODE)
f = 100kHz: t r ≤ 10ns: tf ≤ 10ns (SLOW SLEW RATE MODE)
1.5V
1.5V
tZL
tLZ
2.3V
OUTPUT NORMALLY LOW
0.5V
tZH
tHZ
OUTPUT NORMALLY HIGH
0.5V
2.3V
Figure 8. RS485 Driver Enable and Disable Times
LTC1387 • F08
0V f = 1MHz: tr ≤ 10ns: t f ≤ 10ns INPUT
0V
tPLH
1.5V
OUTPUT
tPHL
1.5V
Figure 9. RS485 Receiver Propagation Delays
LTC1387 • F09
8
3V
D
0V
VO
Y, Z
–VO
1.5V
1.5V
tPHL
tPLH
0V
0V
Figure 10. RS232 Driver Propagation Delays
LTC1387 • F10
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