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PDF SP232A Data sheet ( Hoja de datos )
| Número de pieza | SP232A | |
| Descripción | Enhanced RS-232 Line Drivers/Receivers | |
| Fabricantes | Exar | |
| Logotipo |  |
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SP232A
Enhanced RS-232 Line Drivers/Receivers
FEATURES
• Operates from a Single +5V Power Supply
• Meets all RS-232F and ITU V.28 Specifications
• Operates with 0.1μF Ceramic Capacitors
• High Data rate - 120kbps under load
• Low power CMOS Operation
• +/-2kV Human Body Model ESD Protection
• Lead Free packaging available
DESCRIPTION
The SP232A is a line driver and receiver pair that meets the specifications of RS-232 and V.28 serial
protocols. This device is pin-to-pin compatible with popular industry standard pinouts. The SP232A
offers 120kbps data rate under load, small ceramic type 0.1μF charge pump capacitors and overall
ruggedness for comercial applications. The SP232A features Exar's BiCMOS design allowing for low
power operation without sacrificing performance. This device is avaialble in plastic DIP, SOICW and
nSOIC packages operating over the commercial and industrial temperature ranges.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7000 • Fax (510)668-7017 • www.exar.com
SP232A_100_051308
Free Datasheet http://www.datasheet4u.com/
1 page  
Phase 4
Vdd transfer. The fourth phase connects the
negative terminal of C2 to ground and the posi-
tive terminal of C2 to the Vdd storage capacitor .
This transfers the doubled (V+) voltage onto C3.
Meanwhile, capacitor C1 is charged from Vcc to
prepare it for its next phase.
Under lightly loaded conditions, the intelligent
pump oscillator maximizes efficiency by running
only as needed to maintain V+ and V- voltage
levels. Since interface transceivers spend most
of their time at idle, this power-efficient innova-
tion can greatly reduce total power consump-
tion. This improvement is made possible by
the independent phase sequences of the Exar
charge pump design.
DESCRIPTION
The clock rate of the charge pump typically op-
erates greater than 70kHz allowing the pump to
operate efficiently with small 0.1uF capacitors.
Efficient operation depends on rapid charging
and discharging of C1 and C2. Therefore, the
capacitors should be mounted as close as pos-
sible to the IC and have a low ESR (equivalent
series resistance). Inexpensive, surface mount
ceramic capacitors are ideal for use on charge
pump. If polarized capacitors are used the posi-
tive and negative terminals should be connect-
ed as shown on the typical operating circuit. A
diagram of the 4 individual phases is shown in
Figure 1.
+
V
CC
- Phase 2 – Vss transfer from C2 to C4.
Meanwhile C1 is charged to Vcc
+
V
CC
Phases 1 and 3: Store/Double.
- Double charge from C1 onto C2.
C2 is now charged to -2xVcc
C+
1
+
C
2
e-
e-
+
V+
C
3
V- +
C
4
C+
1
e-
+
C+
2
V+
C
3
e-
e-
+
C
4
Vss
Patented 5,306,954
C+
1
e-
+
V
CC
-
Phase 4 VDD transfer from C2 to C3.
Meanwhile C1 is charged to Vcc
V
DD
e+
e+
+
C+
2
V+
C
3
V- +
C
4
Figure 1. Charge pump phases
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7000 • Fax (510)668-7017 • www.exar.com
SP232A_100_051308
Free Datasheet http://www.datasheet4u.com/
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet SP232A.PDF ] | |
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