參數(shù)資料
型號: LTC1484
廠商: Linear Technology Corporation
英文描述: Low Power RS485 Transceiver with Receiver Fail-Safe(低功耗RS485收發(fā)器(帶失效保險))
中文描述: 485低功耗收發(fā)器與接收器故障保險(低功耗485收發(fā)器(帶失效保險))
文件頁數(shù): 9/16頁
文件大?。?/td> 224K
代理商: LTC1484
9
LTC1484
PI
FU
CTIO
N
S
U
U
A (Pin 6):
Driver Output/Receiver Input. The input resis-
tance is typically 22k when the driver is disabled (DE = 0).
When the driver is enabled, the A output follows the logic
level at the DI pin.
B (Pin 7):
Driver Output/Receiver Input. The input resis-
tance is typically 22k when the driver is disabled (DE = 0).
When the driver is enabled, the B output is inverted from
the logic level at the DI pin.
V
CC
(Pin 8):
Positive Supply. 4.75V
V
CC
5.25V. A 0.1
μ
F
bypass capacitor is recommended.
Driver
INPUTS
DE
1
1
0
0
OUTPUTS
RE
X
X
O
1
DI
1
0
X
X
B
0
1
Z
Z*
A
1
0
Z
Z*
FUU
Receiver
INPUTS
OUTPUTS
RO
1
0
1
1
Z
RE
0
0
0
0
1
DE
0
0
0
0
X
A – B
V
TH(MAX)
V
TH(MIN)
Inputs Open
Inputs Shorted
X
TEST CIRCUITS
OUTPUT
UNDER
TEST
C
L
S1
S2
V
CC
500
1484 F05
OUTPUT
UNDER
TEST
C
RL
1k
S1
S2
V
CC
1k
1484 F03
Figure 3
Figure 5
DE
RE
A
B
DI
C
L1
R
DIFF
C
L2
RO
15pF
A
B
1484 F04
Figure 4
Note: Z = high impedance, X = don’t care
*Shutdown mode for LTC1484
Shutdown mode for LTC1484 if DE = 0. Table valid with or without
termination resistors.
V
OD1
V
OD2
A
B
R
R
V
OC
1484 F01
Figure 1
V
OD3
A
B
375
375
60
–7V TO 12V
1484 F02
Figure 2
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