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PDF SP3223EU Data sheet ( Hoja de datos )
| Número de pieza | SP3223EU | |
| Descripción | Intelligent +3.0V to +5.5V RS-232 Transceivers | |
| Fabricantes | Exar | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SP3223EU (archivo pdf) en la parte inferior de esta página. Total 20 Páginas | ||
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SP3223E/EB/EU
Intelligent +3.0V to +5.5V RS-232 Transceivers
FEATURES
• Meets true EIA/TIA-232-F Standards
from a +3.0V to +5.5V power supply
• Interoperable with EIA/TIA-232 and
EN 1
C1+ 2
20 SHUTDOWN
19 Vcc
adheres to EIA/TIA-562 down to a +2.7V
V+ 3
18 GND
power source
• AUTO ON-LINE® circuitry automatically
wakes up from a 1µA shutdown
• Minimum 250Kbps data rate under load
C1- 4
C2+ 5
C2- 6
SP3223E
17 T1OUT
16 R1IN
15 R1OUT
(EB)
• 1 Mbps data rate for high speed RS-232
(EU)
• Regulated Charge Pump Yields Stable
V- 7
T2OUT 8
R2IN 9
14 ONLINE
13 T1IN
12 T2IN
RS-232 Outputs Regardless of VCC
Variations
R2OUT 10
11 STATUS
• ESD Specifications:
+15KV Human Body Model
Now Available in Lead Free Packaging
+15KV IEC61000-4-2 Air Discharge
+8KV IEC61000-4-2 Contact Discharge
DESCRIPTION
The SP3223 products are RS-232 transceiver solutions intended for portable applications
such as notebook and hand held computers. These products use an internal high-efficiency,
charge-pump power supply that requires only 0.1µF capacitors in 3.3V operation. This charge
pump and Exar's driver architecture allow the SP3223 series to deliver compliant RS-232
performance from a single power supply ranging from +3.3V to +5.0V. The SP3223 is a 2-
driver/2-receiver device ideal for laptop/notebook computer and PDA applications.
The AUTO ON-LINE® feature allows the device to automatically "wake-up" during a shut-
down state when an RS-232 cable is connected and a connected peripheral is turned on.
Otherwise, the device automatically shuts itself down drawing less than 1µA.
SELECTION TABLE
Device
Power
Supplies
RS- 232 RS-232 AUTO ON-LINE ® TTL Data Rate
Drivers Receivers
3-state (kbps)
SP3223E +3.0V to +5.5V
2
2
YES
YES
120
SP3223EB +3.0V to +5.5V
2
2
YES
YES
250
SP3223EU +3.0V to +5.5V
2
2
YES
YES
1000
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7017 • www.exar.com
SP3223E/EB/EU_101_062712
1 page  
TYPICAL OPERATING CIRCUIT
Figure 1. SP3223E Typical Operating Circuit
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7017 • www.exar.com
SP3223E/EB/EU_101_062712
5 Page 
The charge pump operates in a discontinu-
ous mode using an internal oscillator. If the
output voltages are less than a magnitude
of 5.5V, the charge pump is enabled. If the
output voltages exceed a magnitude of 5.5V,
the charge pump is disabled. This oscillator
controls the four phases of the voltage shift-
ing. A description of each phase follows.
Phase 1
— VSS charge storage — During this phase
of the clock cycle, the positive side of capaci-
tCincnoaelr+Cpcsitas1eC–ctdiih1stoeattorrnnaCdVsn2wCsCCifis,et2crtnahhroereeewddvittno2ooilttCtGiaiam2gNl–lee.yDsSpcaViohnntCaceCdren.gttCehiade2l+
to VCC.
charge
is con-
across
Phase 2
—conVnSeScttsrathnesfneerg—ativPehtearsmeintwaloofoCf 2tthoethceloVcSkS
storage capacitor and the positive terminal of
Cat2etdovGoNltaDg.eTthoisCt3r.aTnhsisfegrsenaenreagteadtivveolgtaegneeirs-
regulated to a minimum voltage of -5.5V.
Simultaneous with the transfer of the volt-
aisgsewtoitcChe3,dthtoe
positive
VCC and
sthideenoefgcaatipvaecsitiodreCis1
connected to GND.
Phase 3
—theVcDlDocckhaisrgideesnttoicraagl teo
— The third phase of
the first phase — the
charge transferred in C1 produces –VCC in
the negative terminal of C1, which is applied
tCo2+thiseanteVgCaCt,ivtheesvidoeltaogfecappoatecnittoiarlCa2c.roSsisncCe2
is 2 times VCC.
Phase 4
— VDD transfer — The fourth phase of
the clock connects the negative terminal
of C2 to GND, and transfers this positive
gVeDDnesratoteradgevocltaapgaeciatocrr.ossThCis2 tvooltCa4g,ethies
regulated to +5.5V. At this voltage, the in-
ternal oscillator is disabled. Simultaneous
wpoitshititvheesitdraenosffcearpoafcitthoer Cv1oisltaswgeitcthoeCd t4o,
the
VCC
and the negative side is switched to GND, al-
lowing the charge pump cycle to begin again.
The charge pump cycle will continue as long
as the operational conditions for the internal
oscillator are present.
Since both V+ and V– are separately gener-
ated
and
from
V– will
VCC, in a no–load
be symmetrical.
condition V+
Older charge
pump approaches that generate V– from
V+ will show a decrease in the magnitude
of V– compared to V+ due to the inherent
inefficiencies in the design.
The Exar charge pump is designed to
operate reliably with a range of low cost
capacitors. Either polarized or non polar-
ized capacitors may be used. If polarized
capacitors are used they should be oriented
as shown in the Typical Operating Circuit.
The V+ capacitor may be connected to either
ground or Vcc (polarity reversed.)
The charge pump operates with 0.1µF
capacitors for 3.3V operation. For other
supply voltages, see table 4 for required
capacitor values. Do not use values smaller
than those listed. Increasing the capacitor
values (e.g., by doubling in value) reduces
ripple on the transmitter outputs and may
slightly reduce power consumption. C2, C3,
and C4 can be increased without changing
C1’s value.
For best charge pump efficiency locate the
charge pump and bypass capacitors as
close as possible to the IC. Surface mount
capacitors are best for this purpose. Using
capacitors with lower equivalent series re-
sistance (ESR) and self-inductance, along
with minimizing parasitic PCB trace induc-
tance will optimize charge pump operation.
Designers are also advised to consider that
capacitor values may shift over time and
operating temperature.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • (510)668-7017 • www.exar.com
11
SP3223E/EB/EU_101_062712
11 Page | ||
| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet SP3223EU.PDF ] | |
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