- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄372172 > SP230ACT 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors PDF資料下載
參數(shù)資料
| 型號(hào)： | SP230ACT |
| 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)： | 8/17頁 |
| 文件大小： | 399K |
| 代理商： | SP230ACT |
Date: 8/3/04 + 5V Powered Multi-Channel RS-232 Drivers/Receivers Copyright 2004 Sipex Corporation
8
ENABLE Input (EN)
The
SP235A/B
,
SP236A/B
,
SP240A/B,
and
SP241A/B
all feature an enable input (EN),
which allows the receiver outputs to be either
tri–stated or enabled. The enable input is active
low; 0V applied to EN will enable the receiver
outputs. This can be especially useful when the
receiver is tied directly to a microprocessor data
bus.
Protection From Shorts to >
±
15V
The driver outputs are protected against shorts
to ground, other driver outputs, and V
+
or V
-
.
For protection against voltages exceeding
±
15V,
two back–to–back zener diodes connected to
clamp the outputs to an acceptable voltage level
are recommended. (Refer to
Figure 3.
)
Improved Drive Capability for Mouse
Applications
Each of the devices in this data sheet have
improved drive capability for non-standard ap-
plications. Although the EIA RS-232D stan-
dards specify the maximum loading to be 3k
and 2500pF, the
SP230A
,
SP234A
,
SP235A/B
,
SP236A/B
,
SP237A
,
SP238A
,
SP240A/B,
and
SP241A/B
can typically drive loads as low as
1k
and still maintain
±
5V outputs. This feature
is especially useful when the serial port is in-
tended to be used for a “self-powered” mouse.
In this case the voltage necessary to operate the
circuits in the mouse can be derived from the
RS-232 driver output as long as the loading is
≥
1k
(refer to
Figure 4
). For applications which
even exceed this requirement, drivers can be
connected in parallel, increasing the drive capa-
bility to 750
, while maintaining the
±
5V V
OH
and V
OL
levels (refer to
Figure 5
).
SD
0
0
1
1
EN
0
1
0
1
Power
Up/Down
Up
Up
Down
Down
Receiver
Outputs
Enable
Tri–state
Enable
Tri–state
Figure 3. High Voltage Short Circuit Protection
Figure 2. Charge Pump Voltage Inverter
T IN
T IN
T OUT
T OUT
15V ZENER
15V ZENER
S1
FROM
VOLTAGE DOUBLER
V+
+
V- = -(V+)
+
S2
S3
S4
C2
C4
INTERNAL
OSCILLATOR
GND
GND
output impedance of V
+
and V
-
, which will
degrade V
and V
OL
. Capacitor values can be
as low as 1.0
μ
F.
Shutdown (SD)
The
SP230A
,
SP235A/B
,
SP236A/B
,
SP240A/
B
and
SP241A/B
all feature a control input
which will disable the part and reduce V
current typically to less than 5
μ
A, which is
especially useful to designers of battery–pow-
ered systems. In the “power–off” mode the
receiver and transmitter will both be tri-stated.
V
+
will discharge to V
CC
, and V
-
will discharge
to ground.
For complete shutdown to occur and the 10
μ
A
current drain to be realized, the following con-
ditions must be met:
+5.00V must be applied to the SD pin;
ENABLE must either 0V, +5.0V or not connected;
the transmitter inputs must be either +5.0V or not
connected;
V
CC
must be +5V;
Receiver inputs must be >0V and <+5V
Please note that for proper operation, the SD
input pin must never be left floating.
Table 2. Wake–Up Truth Table
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SP230ACX | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| SP230AEP | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| SP230AET | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| SP2524 | Low ESR Cap. & Low Power High-speed CMOS LDO With CE Pin |
| SP2524XS25RG | Low ESR Cap. & Low Power High-speed CMOS LDO With CE Pin |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP230ACT/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:+5V Powered Multi-Channel RS-232 Drivers/Receivers |
| SP230ACX | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:+5V Powered Multi-Channel RS-232 Drivers/Receivers |
| SP230AEP | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:+5V Powered Multi-Channel RS-232 Drivers/Receivers |
| SP230AET | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:+5V Powered Multi-Channel RS-232 Drivers/Receivers |
| SP230AET/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:+5V Powered Multi-Channel RS-232 Drivers/Receivers |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。