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PDF SP3243B Data sheet ( Hoja de datos )
| Número de pieza | SP3243B | |
| 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 SP3243B (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
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®
SP3223B/3243B
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 250kbps data rate under load
■ Regulated Charge Pump Yields Stable
RS-232 Outputs Regardless of VCC
Variations
■ ESD Specifications:
+2kV Human Body Model
DESCRIPTION
The SP3223B and SP3243B products are RS-232 transceiver solutions intended for portable
or hand-held applications such as notebook and palmtop computers. The SP3223B and
SP3243B 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
SP3223B/3243B series to deliver compliant RS-232 performance from a single power supply
ranging from +3.0V to +5.5V. The SP3223B is a 2-driver/2-receiver device, and the SP3243B
is a 3-driver/5-receiver device ideal for laptop/notebook computer and PDA applications. The
SP3243B 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 RS-232
External AUTO ON-LINE®
Drivers Receivers Components
Circuitry
TTL 3-State
No. of
Pins
SP3223B +3.0V to +5.5V
2
2 4 capacitors
YES
YES 20
SP3243B +3.0V to +5.5V
3
5 4 capacitors
YES
YES 28
Applicable U.S. Patents - 5,306,954; and other patents pending.
Rev. 6/30/03
SP3223B/3243B +3.0V to +5.5V RS-232 Transceivers
1
© Copyright 2003 Sipex Corporation
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS
Unless otherwise noted, the following performance characteristics apply for V = +3.3V, 250kbps data rate, all drivers
CC
loaded with 3KΩ, 0.1µF charge pump capacitors, and TAMB = +25°C.
25
20
15
10
5
0
0
- Slew
+ Slew
1 Transmitter at 250Kbps
2 Transmitter at 15.6Kbps
All drivers loaded 3K + Load Cap
500 1000 2000 3000 4000 5000
Load Capacitance (pF)
40
35
30
250Kbps
120Kbps
25
20Kbps
20
15
10
5
0
0
1 Transmitter at full Data Rate
2 Transmitters at 15.5 Kbps
All Transmitters loades 3K + Load Cap
1000 2000 3000
4000
Load Capacitance (pF)
5000
Figure 7. Slew Rate VS. Load Capacitance for the
SP3243B
Figure 8. Supply Current VS. Load Capacitance when
Transmitting Data for the SP3243B
25
20
15
10
1 Transmitter at 250Kbps
2 Transmitters at 15.6Kbps
5 All drivers loaded with 3K // 1000pF
0
2.7
3 3.5 4 4.5
Supply Voltage (VDC)
5
Figure 9. Supply Current VS. Supply Voltage for the
SP3243B
6
4
2
0
-2
-4
-6
2.7
TxOUT +
TxOUT -
3 3.5 4 4.5
Supply Voltage (VDC)
5
Figure 10. Transmitter Output Voltage VS. Supply
Voltage for the SP3243B
Rev. 6/30/03
SP3223B/3243B +3.0V to +5.5V RS-232 Transceivers
5
© Copyright 2003 Sipex Corporation
5 Page 
DEVICE: SP3223B
SHUTDOWN
EN
00
01
10
11
TXOUT RXOUT
High Z Active
High Z High Z
Active Active
Active High Z
DEVICE: SP3243B
SHUTDOWN TXOUT RXOUT R2OUT
0 High Z High Z 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.
+3V to +5V
+
C5 0.1µF
+
C1 0.1µF
+
C2 0.1µF
TTL/CMOS
INPUTS
VCC
C1+
V+
C1-
C2+ SP3223B
SP3243B
C2-
V-
T1IN T1OUT
TXIN TXOUT
+
C3 0.1µF
C4 0.1µF
+
TTL/CMOS
OUTPUTS
VCC
To µP Supervisor
Circuit
R1OUT
R1IN
5kΩ
RXOUT
EN
RXIN
5kΩ
1000pF
SHUTDOWN
ONLINE
STATUS
GND
18
1000pF
Figure 17. Loopback Test Circuit for RS-232 Driver
Data Transmission Rates
The SP3223B and SP3243B drivers can main-
tain high data rates up to 250kbps fully loaded.
Figure 17. shows a loopback test circuit used to
test the SP3243B RS-232 Drivers. Figure 18
shows the test results of the loopback circuit with
all three drivers active at 120kbps with typical
RS-232 loads in parallel with 1000pF capacitors.
Figure 19 shows the test results where one driver
was active at 250kbps and all three drivers loaded
with an RS-232 receiver in parallel with a 1000pF
capacitor. A solid RS-232 data transmission
rate of 250kbps provides compatibility with many
designs in personal computer peripherals and
LAN applications.
Receivers
The receivers convert ±5.0V EIA/TIA-232
levels to TTL or CMOS logic output levels. All
receivers have an inverting output that can be
disabled by using the EN pin.
Figure 18. Loopback Test Circuit All Drivers at 120kbps
Figure 19. Loopback Test Circuit One Driver at 250kbps
Rev. 6/30/03
SP3223B/3243B +3.0V to +5.5V RS-232 Transceivers
11
© Copyright 2003 Sipex Corporation
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet SP3243B.PDF ] | |
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