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PDF SP3243E Data sheet ( Hoja de datos )
| Número de pieza | SP3243E | |
| Descripción | Intelligent +3.0V to +5.5V RS-232 Transceivers | |
| Fabricantes | Sipex | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SP3243E (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
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® SP3223E/3243E
Intelligent +3.0V to +5.5V RS-232 Transceivers
■ Meets true EIA/TIA-232-F Standards
from a +3.0V to +5.5V power supply
■ Interoperable with EIA/TIA-232 and
adheres to EIA/TIA-562 down to a +2.7V
power source
■ AUTO ON-LINE® circuitry automatically
wakes up from a 1µA shutdown
■ Minimum 120Kbps data rate under load
■ Regulated Charge Pump Yields Stable
RS-232 Outputs Regardless of VCC
Variations
■ Enhanced ESD Specifications:
+15KV Human Body Model
+15KV IEC1000-4-2 Air Discharge
+8KV IEC1000-4-2 Contact Discharge
DESCRIPTION
The SP3223E and 3243E products are RS-232 transceiver solutions intended for portable or
hand-held applications such as notebook and palmtop computers. The SP3223E and 3243E
use an internal high-efficiency, charge-pump power supply that requires only 0.1µF capacitors
in 3.3V operation. This charge pump and Sipex's driver architecture allow the SP3223E/
3243E series to deliver compliant RS-232 performance from a single power supply ranging
from +3.3V to +5.0V. The SP3223E is a 2-driver/2-receiver device, and the SP3243E is a
3-driver/5-receiver device ideal for laptop/notebook computer and PDA applications.
The SP3243E includes one complementary receiver that remains alert to monitor an external
device's Ring Indicate signal while the device is shutdown.
The AUTO ON-LINE® feature allows the device to automatically "wake-up" during a shutdown
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
Drivers
RS-232
Receivers
SP3223E +3.0V to +5.5V
2
2
SP3243E +3.0V to +5.5V
3
5
External
Components
4 capacitors
4 capacitors
AUTO ON-LINE®
Circuitry
TTL 3-State
No. of
Pins
YES
YES
20
YES
YES
28
Applicable U.S. Patents - 5,306,954; and other patents pending.
Rev. 11/14/02
SP3223E +3.0V to +5.5V RS-232 Transceivers
1
© Copyright 2002 Sipex Corporation
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Unless otherwise noted, the following performance characteristics apply for V = +3.3V, 120Kbps data rate, all drivers
CC
loaded with 3KΩ, 0.1µF charge pump capacitors, and TAMB = +25°C.
40
35
118KHz
60KHz
10KHz
30
25
20
15
10
5
0
0
500
1000
1500
2000
Load Capacitance [pF]
Figure 3. Supply Current VS. Load Capacitance when
Transmitting Data for the SP3223E
6
4
2
0
0
-2
-4
-6
Vout+
Vout-
500 1000 1500 2000 2500
Load Capacitance [pF]
Figure 4. Transmitter Output Voltage VS. Load
Capacitance for the SP3243E
16
14
12
10
8
6
4
2
0
0
+ Slew
- Slew
500
1000
1500
2000
2500
Load Capacitance [pF]
3000
Figure 5. Slew Rate VS. Load Capacitance for the
SP3243E
80
70
60
50
40
30
20
10
0
0
118KHz
60KHz
10KHz
500
1000
1500
2000
2500
Load Capacitance [pF]
3000
Figure 6. Supply Current VS. Load Capacitance when
Transmitting Data for the SP3243E
Rev. 11/14/02
SP3223E +3.0V to +5.5V RS-232 Transceivers
5
© Copyright 2002 Sipex Corporation
5 Page 
DEVICE: SP3223E
SHUTDOWN
0
EN
0
TXOUT
High Z
RXOUT
Active
0 1 High Z High Z
1
0
Active
Active
1
1
Active
High Z
DEVICE: SP3243E
SHUTDOWN
0
TXOUT
High Z
RXOUT
High Z
R2OUT
Active
1
Active
Active
Active
Table 2. SHUTDOWN and EN Truth Tables
Note: In AUTO ON-LINE® Mode where ONLINE =
GND and SHUTDOWN = VCC, the device will shut down
if there is no activity present at the Receiver inputs.
Figure 12 shows a loopback test circuit used to
test the RS-232 Drivers. Figure 13 shows the test
results of the loopback circuit with all three
drivers active (SP3243E) at 120Kbps with typi-
cal RS-232 loadsinparallelwith1000pFcapacitors.
Figure 14 shows the test results where one driver
was active at 235Kbps and all three drivers
loaded with an RS-232 receiver in parallel with
a 1000pF capacitor. A solid RS-232 data trans-
+3V to +5V
+
C5 0.1µF
+
C1 0.1µF
+
C2 0.1µF
2 C1+
4 C1-
5 C2+
6 C2-
19
VCC
SP3223E
SP3243E
V+ 3
V- 7
TTL/CMOS
INPUTS
T1IN
TXIN
T1OUT
TXOUT
+
C3 0.1µF
C4 0.1µF
+
TTL/CMOS
OUTPUTS
R1OUT
R1IN
5KΩ
VCC
To µP Supervisor
Circuit
RXOUT
1 EN
RXIN
5KΩ
20 SHUTDOWN
14 ONLINE
11 STATUS
GND
18
1000pF
1000pF
Figure 12. Loopback Test Circuit for RS-232 Driver
Data Transmission Rates
mission rate of 120Kbps provides compatibility
with many designs in personal computer periph-
erals and LAN applications.
Receivers
The receivers convert ±5.0V EIA/TIA-232
levels to TTL or CMOS logic output levels.
Receivers have an inverting output that can be
disabled by using the EN pin.
T1 IN
T1 OUT
R1 OUT
T1 IN
T1 OUT
R1 OUT
Figure 13. Loopback Test Circuit Result at 120Kbps
(All Drivers Fully Loaded)
Figure 14. Loopback Test Circuit result at 235Kbps
(All Drivers Fully Loaded)
Rev. 11/14/02
SP3223E +3.0V to +5.5V RS-232 Transceivers
© Copyright 2002 Sipex Corporation
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet SP3243E.PDF ] | |
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