參數(shù)資料
型號(hào): LTC489I
廠商: Linear Technology Corporation
英文描述: Quad RS485 Line Receiver
中文描述: 485四線接收器
文件頁(yè)數(shù): 5/12頁(yè)
文件大小: 228K
代理商: LTC489I
5
LTC488/LTC489
LTC488
LTC489
DIFFERENTIAL
A – B
V
ID
0.2V
–0.2V < V
ID
< 0.2V
V
ID
0.2V
X
H: High Level
L: Low Level
X: Irrelevant
ENABLES
EN12 or EN34
H
H
H
L
: Indeterminate
Z: High Impedance (Off)
OUTPUT
RO
H
L
Z
FU
DIFFERENTIAL
A – B
V
ID
0.2V
ENABLES
OUTPUT
RO
H
H
L
L
Z
EN
H
X
H
X
H
X
L
EN
X
L
X
L
X
L
H
–0.2V < V
ID
< 0.2V
V
ID
0.2V
X
TEST CIRCUITS
Figure 1. Receiver Timing Test Circuit
Note:
The input pulse is supplied by a generator having the following characteristics:
f = 1MHz, Duty Cycle = 50%, t
r
< 10ns, t
f
10ns, Z
OUT
= 50
D
488/9 F01
DRIVER
RECEIVER
C
L
RO
A
B
54
100pF
100pF
Figure 2. Receiver Enable and Disable Timing Test Circuit
1k
488/9 F02
C
L
S1
S2
1k
V
CC
RECEIVER
OUTPUT
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