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| 型號(hào)： | SP237A |
| 英文描述： | 5V Multi-Channel RS-232 Drivers/Receivers(5V,多通道RS-232線驅(qū)動(dòng)器/接收器(5發(fā)3收）) |
| 中文描述： | 5V的多通道RS - 232驅(qū)動(dòng)器/接收器（5V的，多通道的RS - 232線驅(qū)動(dòng)器/接收器（5發(fā)3收）） |
| 文件頁(yè)數(shù)： | 8/17頁(yè) |
| 文件大?。?/td> | 661K |
| 代理商： | SP237A |
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SP30A/234A/235A/236A/237A/238A/239A/
SP241A/235B/236B/240A/240B/241A/241B
+5V Powered Multi-Channel RS-232 Drivers/Receivers
8
Copyright 2000 Sipex Corporation
ENABLE Input (EN)
The
SP235A/B
,
SP236A/B
,
SP239A, 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 micropro-
cessor 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
,
SP239, 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 intended 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 applica-
tions which even exceed this requirement, driv-
ers can be connected in parallel, increasing the
drive capability 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
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP237ACS | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:+5V Powered Multi-Channel RS-232 Drivers/Receivers |
| SP237ACT | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:+5V Powered Multi-Channel RS-232 Drivers/Receivers |
| SP237ACT/TR | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:+5V Powered Multi-Channel RS-232 Drivers/Receivers |
| SP237ACT-L | 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述: |
| SP237ACX | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:+5V Powered Multi-Channel RS-232 Drivers/Receivers |
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