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PDF SP3243EH Data sheet ( Hoja de datos )
| Número de pieza | SP3243EH | |
| Descripción | High Speed 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 SP3243EH (archivo pdf) en la parte inferior de esta página. Total 24 Páginas | ||
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® SP3223EH/3243EH
High Speed Intelligent +3.0V to +5.5V
RS-232 Transceivers
s Meets true EIA/TIA-232-F Standards
from a +3.0V to +5.5V power supply
s Interoperable with EIA/TIA-232 and
adheres to EIA/TIA-562 down to a +2.7V
power source
s Auto-Online™ circuitry automatically
wakes up from a 1µA shutdown
s Regulated Charge Pump Yields Stable
RS-232 Outputs Regardless of VCC
Variations
s Enhanced ESD Specifications:
+15KV Human Body Model
+15KV IEC1000-4-2 Air Discharge
+8KV IEC1000-4-2 Contact Discharge
s 460 Kbps minimum transmission rate
s Ideal for High Speed RS-232 Applications
DESCRIPTION
The SP3223EH and 3243EH products are RS-232 transceiver solutions intended for portable
or hand-held applications such as notebook and palmtop computers. The "H" series is based
on Sipex's SP3223E/3243E series and has been enhanced for high speed. The data rate is
improved to 460Kbps, easily meeting the demands of high speed RS-232 applications. The
SP3223EH and 3243EH 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 SP3223EH/3243EH series to deliver compliant RS-232 performance from
a single power supply ranging from +3.3V to +5.0V. The SP3223EH is a 2-driver/2-receiver
device, and the SP3243EH is a 3-driver/5-receiver device, ideal for laptop/notebook computer
and PDA applications. The SP3243EH includes one complementary receiver that remains
alert to monitor an external device's Ring Indicate signal while the device is shutdown.
The Auto-Online 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
External
Components
Auto-Online TTL 3-State No. of
Circuitry
Pins
SP3223EH +3.0V to +5.5V
2
2 4 capacitors YES
YES
20
SP3243EH +3.0V to +5.5V
3
5 4 capacitors YES
YES
28
Applicable U.S. Patents - 5,306,954; and other patents pending.
SP3223EHDS/11
SP3223EH +3.0V to +5.5V RS-232 Transceivers
1
© Copyright 2000 Sipex Corporation
1 page  
TYPICAL PERFORMANCE CHARACTERISTICS (continued)
Unless otherwise noted, the following performance characteristics apply for VCC = +3.3V, 235Kbps data rate, all drivers
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 SP3223EH
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 SP3243EH
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
SP3243EH
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 SP3243EH
SP3223EHDS/11
SP3223EH +3.0V to +5.5V RS-232 Transceivers
5
© Copyright 2000 Sipex Corporation
5 Page 
DEVICE: SP3223EH
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: SP3243EH
SHUTDOWN
0
T OUT
X
High Z
R OUT
X
High Z
R OUT
2
Active
1
Active
Active
Active
Table 2. SHUTDOWN and EN Truth Tables
Note: In Auto-Online Mode where ONLINE = GND and
SHUTDOWN = VCC, the device will shut down if there is
no activity present at the Receiver inputs.
The SP3223EH and SP3243EH drivers can
maintain high data rates over 460Kbps fully
loaded. 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 at 120Kbps with typical
RS-232 loads in parallel with 1000pF capacitors.
Figure 14 shows the test results where one driver
was active at 1Mbps and all three drivers loaded
+3V to +5V
+
C5 0.1µF
+
C1 0.1µF
+
C2 0.1µF
2 C1+
4 C1-
5 C2+
6 C2-
19
VCC
SP3223EH
SP3243EH
V+ 3
V- 7
TTL/CMOS
INPUTS
T1IN
TXIN
T1OUT
TXOUT
+
C3 0.1µF
C4 0.1µF
+
TTL/CMOS
OUTPUTS
VCC
To µP Supervisor
Circuit
R1OUT
R1IN
5KΩ
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
with an RS-232 receiver in parallel with a 1000pF
capacitor. A superior RS-232 data transmission
rate of 1Mbps makes the SP3223EH/3243EH
series an ideal match for high speed LAN and
personal computer peripheral 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 13. Loopback Test Circuit 1 Driver Fully Loaded
Figure 14. Loopback Test Circuit
(All Drivers Fully Loaded)
SP3223EHDS/11
SP3223EH +3.0V to +5.5V RS-232 Transceivers
© Copyright 2000 Sipex Corporation
11
11 Page | ||
| Páginas | Total 24 Páginas | |
| PDF Descargar | [ Datasheet SP3243EH.PDF ] | |
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