Datasheet

6
LTC485
sn485 LTC485ffs
1.5V
t
PHL
f = 1MHz, t
r
≤ 10ns, t
f
≤ 10ns
R
–V
OD2
A, B
0V
1.5V
t
PLH
OUTPUT
INPUT
V
OD2
V
OL
V
OH
LTC485 • F07
Figure 7. Receiver Propagation Delays
Figure 8. Receiver Enable and Disable Times
1.5V
t
ZL
1.5V
1.5V
t
ZH
1.5V
t
LZ
0.5V
0.5V
t
HZ
f = 1MHz, t
r
≤ 10ns, t
f
≤ 10ns
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
3V
0V
RE
5V
0V
R
R
LTC485 • F08
LTC485 Transmitting
INPUTS OUTPUTS
RE DE DI B A
X 1 1 No Fault 0 1
X 1 0 No Fault 1 0
X0X X ZZ
X 1 X Fault Z Z
LINE
CONDITION
LTC485 Receiving
INPUTS OUTPUTS
RE DE A – B R
00≥0.2V 1
00≤– 0.2V 0
0 0 Inputs Open 1
10 X Z
FU CTIO TABLES
UU
SWITCHI G TI E WAVEFOR S
UW W
1.5V
t
ZL
2.3V
2.3V
t
ZH
1.5V
t
LZ
0.5V
0.5V
t
HZ
f = 1MHz, t
r
≤ 10ns, t
f
≤ 10ns
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
3V
0V
DI
5V
V
OL
V
OH
0V
A, B
A, B
LTC485 • F06
Figure 6. Driver Enable and Disable Times