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SP230A Datasheet(PDF) 8 Page - Sipex Corporation

Part No. SP230A
Description  5V Powered Multi-Channel RS-232 Drivers/Receivers
Download  17 Pages
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Maker  SIPEX [Sipex Corporation]
Homepage  http://www.sipex.com
Logo SIPEX - Sipex Corporation

SP230A Datasheet(HTML) 8 Page - Sipex Corporation

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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
Ω 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
≥1kΩ (refer to Figure 4). For applications which
even exceed this requirement, drivers can be
connected in parallel, increasing the drive capa-
bility to 750
Ω, while maintaining the ±5V V
OH
and V
OL levels (refer to Figure 5).
SD
EN
Power
Up/Down
Receiver
Outputs
0
0
1
1
0
1
0
1
Up
Up
Down
Down
Enable
Tri–state
Enable
Tri–state
Figure 3. High Voltage Short Circuit Protection
Figure 2. Charge Pump Voltage Inverter
T IN
1
T IN
T OUT
T OUT
2
1
2
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
OH and VOL. Capacitor values can be
as low as 1.0
µF.
Shutdown (SD)
TheSP230A, SP235A/B, SP236A/B, SP240A/
B and SP241A/B all feature a control input
which will disable the part and reduce V
CC
current typically to less than 5
µA, 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
µA
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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