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參數(shù)資料
| 型號： | SP3282EBCA |
| 元件分類： | RS-232 |
| 英文描述： | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| 中文描述： | 5V的高速RS - 232收發(fā)器與0.1uF電容 |
| 文件頁數(shù)： | 10/15頁 |
| 文件大?。?/td> | 307K |
| 代理商： | SP3282EBCA |
Date: 02/24/05
SP3282EB Intelligent +2.35V to +5.5V RS-232 Transceivers
Copyright 2005 Sipex Corporation
10
AUTO ON-LINE
Circuitry
The SP3282EB
device has a patent pending
AUTO ON-LINE
circuitry on board that saves
power in applications such as laptop computers,
palmtop (PDA) computers, and other portable
systems.
The SP3282EB device incorporates an
AUTO ON-LINE
circuit that automatically
enables itself when the external transmitters are
enabled and the cable is connected. Conversely,
the AUTO ON-LINE
circuit also disables most
of the internal circuitry when the device is not
being used and goes into a standby mode where the
device typically draws 1
μ
A. This function is
controlled by the ONLINE pin. When this pin is
tied to a logic LOW, the AUTO ON-LINE
func-
tion is active. Once active, the device is enabled
until there is no activity on the receiver inputs. The
Table 3. AUTO ON-LINE
Logic
N
W
T
O
U
D
P
T
U
N
I
H
S
E
N
U
I
N
P
N
O
I
T
T
A
U
L
P
A
N
N
I
G
R
I
S
V
2
3
E
2
S
E
R
R
T
E
I
C
S
T
U
U
T
P
A
T
T
U
S
O
T
X
T
U
O
R
X
T
U
O
R
E
V
S
I
E
U
C
T
S
A
N
T
A
S
R
T
H
G
I
H
-
S
E
Y
H
G
I
H
e
v
A
e
v
A
l
m
r
N
o
p
O
n
H
G
I
H
H
G
I
H
O
N
W
O
L
e
v
A
e
v
A
l
m
r
N
o
p
O
n
H
G
I
H
W
O
L
O
N
W
O
L
Z
-
g
H
e
v
A
E
N
I
-
e
d
N
O
o
O
M
T
U
A
W
O
L
-
S
E
Y
H
G
I
H
Z
-
g
H
Z
-
g
H
n
w
o
d
h
S
W
O
L
-
O
N
W
O
L
Z
-
g
H
Z
-
g
H
n
w
o
d
h
S
Figure 16. Stage II of AUTO ON-LINE
Circuitry
STATUS
Delay
Delay
Delay
R
1
INACT
R
2
INACT
R
3
INACT
receiver input typically sees at least +3V, which
are generated from the transmitters at the other end
of the cable with a +5V minimum. When the
external transmitters are disabled or the cable is
disconnected, the receiver inputs will be pulled
down by their internal 5k
resistors to ground.
When this occurs over a period of time, the internal
transmitters will be disabled and the device goes
into a shutdown or standby mode. When ONLINE
is HIGH, the AUTO ON-LINE
mode is disabled.
The AUTO ON-LINE
circuit has two stages:
1) Inactive Detection
2) Accumulated Delay
The first stage, shown in Figure 15, detects an
inactive input. A logic HIGH is asserted on
R
X
INACT if the cable is disconnected or the
相關PDF資料 |
PDF描述 |
|---|---|
| SP3282 | Replaced by ADS7842 : |
| SP3282EB | Replaced by ADS7842 : |
| SP3282EBCY | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| SP3282EBEA | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| SP3282EBEY | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| SP3282EBCA/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Intelligent +2.35V to +5.5V RS-232 Transceivers |
| SP3282EBCY | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Intelligent +2.35V to +5.5V RS-232 Transceivers |
| SP3282EBCY/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Intelligent +2.35V to +5.5V RS-232 Transceivers |
| SP3282EBEA | 制造商:Exar Corporation 功能描述:Line Transceiver, 5-Driver, 3-Receiver, 28 Pin, Plastic, SSOP |
| SP3282EBEA/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Intelligent +2.35V to +5.5V RS-232 Transceivers |
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