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參數(shù)資料
| 型號(hào)： | SP385AET |
| 元件分類： | 外設(shè)及接口 |
| 英文描述： | Low Power 5V RS232 Dual Driver/Receiver with 0.1?μF Capacitors; Package: SO; No of Pins: 16; Temperature Range: -40?°C to 85?°C |
| 中文描述： | 電可擦除可編程邏輯器件 |
| 文件頁(yè)數(shù)： | 6/9頁(yè) |
| 文件大?。?/td> | 65K |
| 代理商： | SP385AET |
SP385ADS/05
SP385A Line Driver/Receiver
6
Copyright 2000 Sipex Corporation
Charge Pump
The charge pump section of the these devices
allows the circuit to operate from a single +5V
±
10% power supply by generating the required
operating voltages internal to the devices. The
charge pump consists of two sections — 1) a
voltage doubler and 2) a voltage inverter.
As shown in
Figure 1
, an internal oscillator trig-
gers the charge accumulation and voltage inver-
sion. The voltage doubler momentarily stores a
charge on capacitor C
equal to V
, referenced to
ground. During the next transition of the oscillator
this charge is boot-strapped to transfer charge to
capacitor C
3
. The voltage across C
3
is now from
V
cc
to V
+
.
In the inverter section
(Figure 2)
, the voltage
across C
is transferred to C
forcing a range of 0V
to V
+
across C
. Boot-strapping of C
2
will then
transfer charge to C
4
to genrate V
-
.
One of the significant enhancements over previ-
ous products of this type is that the values of the
capacitors are no longer critical and have been
decreased in size considerably to 0.1
μ
F. Because
the charge pump runs at a higher frequency, the
0.1
μ
F capacitors are sufficient to transfer and
sustain charges to the two transmitters.
APPLICATION HINTS
Protection From Shorts to
±
15V
The driver outputs are protected against shorts
to ground, other driver outputs, and V
+
or V
-
. If
the possibility exists that the outputs could be
inadvertently connected to voltages higher than
±
15V, then it is recommended that external
protection be provided. For protection against
voltages exceeding
±
15V, two back-to-back zener
diodes connected from each output to ground will
clamp the outputs to an acceptable voltage level.
Shutdown (ON/OFF)
The
SP385A
has a shut-down/standby mode to
conserve power in battery-powered systems. To
activate the shutdown mode, which stops the op-
eration of the charge pump, a logic “0” is applied
to the appropriate control line. The shutdown
mode is controlled on the
SP385A
by a logic “0”
on the ON/OFF control line (pin 18 for the SOIC
and pin 20 for the SSOP packages); this puts the
transmitter outputs in a tri–state mode.
Figure 1. Charge Pump Voltage Doubler
Figure 2. Charge Pump Voltage Inverter
S1
GND
V
CC
+
V+ = 2V
CC
+
V
CC
S2
S3
S4
C1
C3
INTERNAL
OSCILLATOR
S1
FROM
VOLTAGE DOUBLER
V+
+
V- = -(V+)
+
S2
S3
S4
C2
C4
INTERNAL
GND
GND
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SP385E-1 | Low Power 5V RS232 Dual Driver/Receiver with 0.1?μF Capacitors; Package: SO; No of Pins: 16; Temperature Range: -40?°C to 85?°C |
| SP385E-1CA | Low Power 5V RS232 Dual Driver/Receiver with 0.1?μF Capacitors; Package: SO; No of Pins: 16; Temperature Range: -40?°C to 85?°C |
| SP385E-1CT | Low Power 5V RS232 Dual Driver/Receiver with 0.1?μF Capacitors; Package: SO; No of Pins: 16; Temperature Range: -40?°C to 85?°C |
| SP385E-1EA | Low Power 5V RS232 Dual Driver/Receiver with 0.1?μF Capacitors; Package: SO; No of Pins: 16; Temperature Range: -40?°C to 85?°C |
| SP385E-1ET | Low Power 5V RS232 Dual Driver/Receiver with 0.1?μF Capacitors; Package: SO; No of Pins: 16; Temperature Range: -40?°C to 85?°C |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| SP385A-W1 | 制造商:Black Box Corporation 功能描述:1 YEAR WARRANTY FOR SP385A |
| SP385A-W3 | 制造商:Black Box Corporation 功能描述:3 YEAR WARRANTY FOR SP385A |
| SP385E | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Enhanced +3V or +5V RS-232 Line Driver/Receiver |
| SP385E_05 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:Enhanced +3V or +5V RS-232 Line Driver/Receiver |
| SP385E-1 | 制造商:SIPEX 制造商全稱:Sipex Corporation 功能描述:True +3V or +5V RS-232 Line Driver/Receiver |
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