|
|
PDF SP312A Data sheet ( Hoja de datos )
| Número de pieza | SP312A | |
| Descripción | Enhanced RS-232 Line Drivers/Receivers | |
| Fabricantes | Sipex | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de SP312A (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
|
No Preview Available !
®
SP231A/232A/233A/310A/312A
Enhanced RS-232 Line Drivers/Receivers
s Operates from Single 5V Power Supply
s Meets All RS-232D and V.28
Specifications
s Multiple Drivers and Receivers
s Small Charge Pump Capacitors –
0.1µF
s Operates with 0.1µF and 100µF
Capacitors
s High Data Rate – 120kbps Under Load
s High Output Slew Rate –
10V/µs Under Load
s Low Power Shutdown ≤1µA
s 3-State TTL/CMOS Receiver Outputs
s ±30V Receiver Input Levels
s Low Power CMOS – 15mA Operation
DESCRIPTION…
The Sipex SP231A, SP232A and SP233A are enhanced versions of the Sipex SP231, SP232
and SP233 RS-232 line drivers/receivers. They are pin-for-pin replacements for these earlier
versions and will operate in their sockets. Performance enhancements include 10V/µs slew rate,
120k bits per second guaranteed transmission rate, and increased drive current for longer and
more flexible cable configurations. Ease of use enhancements include smaller, 0.1µF charge
pump capacitors, enhanced ESD protection, low power dissipation and overall ruggedized
construction for commercial environments. The series is available in plastic and ceramic DIP and
SOIC packages operating over the commercial, industrial and military temperature ranges.
RS-232 OUTPUTS RS-232 INPUTS
CHARGE
PUMP
T1 T2
R1 R2
SP231ADS/01
TTL/CMOS INPUTS TTL/CMOS OUTPUTS
SP231A Enhanced RS-232 Line Drivers/Receivers
1
© Copyright 2000 Sipex Corporation
1 page  
Receivers
The receivers convert RS-232 input signals to
inverted TTL signals. Since the input is usually
from a transmission line, where long cable lengths
and system interference can degrade the signal, the
inputs have a typical hysteresis margin of 500mV.
This ensures that the receiver is virtually immune
to noisy transmission lines.
The input thresholds are 0.8V minimum and
2.4V maximum, again well within the ±3V
RS-232 requirements. The receiver inputs are also
protected against voltages up to ±30V. Should an
input be left unconnected, a 5kOhm pulldown
resistor to ground will commit the output of the
receiver to a high state.
In actual system applications, it is quite possible
for signals to be applied to the receiver inputs
before power is applied to the receiver circuitry.
This occurs, for example, when a PC user attempts
toprint,onlytorealizetheprinterwasn’tturnedon.
In this case an RS-232 signal from the PC will
appear on the receiver input at the printer. When
the printer power is turned on, the receiver will
operate normally. All of these enhanced devices
are fully protected.
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 C1 equal to Vcc, referenced to
ground. During the next transition of the oscillator
this charge is boot-strapped to transfer charge to
cVacpcatcoitVor+.C3. The voltage across C3 is now from
In the inverter section (Figure 2), the voltage
attorcarnVoss+fseaCrcc3rhoisastrsrgaCen2ts.ofeBCror4eodtto-tsogtreCanp2rpfaotienrcgVino-g.f
a range of 0V
C2 will then
One of the significant enhancements over
previous products of this type is that the values of
the capacitors are no longer critical and have been
decreased in size considerably to 0.1µF. Because
the charge pump runs at a much higher frequency,
the 0.1µF 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.
+5V INPUT
V+ (+8.5V to +13.2V)
1
0.1µ F +
6.3V
2
C 1+
C 1-
13
V CC
+12V to -12V
Voltage Inverter
14
V+
0.1µ F
16V
V- 3 +
T1 IN
T2 IN
8
7
400k Ω
400k Ω
T1
T2
11 T1OUT
4 T2OUT
R1OUT
9
R1 10 R1IN
5k Ω
R2OUT
6
R2
5 R2IN
SP231A
5k Ω
GND 12
Figure 3. Typical Circuits using the SP231A and 232A.
+5V INPUT
10 µF 6.3V
+
1
0.1µ F +
6.3V
3
4
0.1µ F +
16V 5
C 1+
C 1-
C 2+
C 2-
16
V CC
+5V to +10V
Voltage Doubler
+10V to -10V
Voltage Inverter
T1 IN
11
T2 IN
10
400k Ω
400k Ω
T1
T2
0.1µ F 6.3V
V+ 2 +
*
V- 6 + 0.1µ F
16V
14 T1OUT
7 T2OUT
R1OUT
12
R1 13 R1IN
5k Ω
R2OUT
9
R2
8 R2IN
SP232A
5k Ω
GND 15
*The negative terminal of the V+ storage capacitor can be tied
to either VCC or GND. Connecting the capacitor to VCC (+5V)
is recommended.
SP231ADS/01
SP231A Enhanced RS-232 Line Drivers/Receivers
5
© Copyright 2000 Sipex Corporation
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet SP312A.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| SP312A | Enhanced RS-232 Line Drivers/Receivers | Sipex |
| SP312A | Enhanced RS-232 Line Drivers/Receivers |  Exar |
| SP312E | High Performance RS-232 Line Drivers/Receivers | Exar |
| SP312E | High-Performance RS-232 Line Drivers/Receivers | Sipex |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |