®
SP3223U/3243U
High Speed 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
EN
20
1
2
3
4
5
6
7
SHUTDOWN
VCC
19
C1+
V+
GND
18
C1-
T1OUT
R1IN
17
SP3223U 16
15
®
■ AUTO ON-LINE circuitry automatically
C2+
C2-
V-
wakes up from a 1µA shutdown
■ Regulated Charge Pump Yields Stable
RS-232 Outputs Regardless of VCC
Variations
R1OUT
14
13
ONLINE
T1IN
T2OUT
R2IN
8
9
■ ESD Specifications:
12 T2IN
11 STATUS
+2kV Human Body Model
10
R2OUT
■ 1000 Kbps minimum transmission rate
■ Ideal for High Speed RS-232 Applications
Now Available in Lead Free Packaging
DESCRIPTION
The SP3223U and SP3243U products are RS-232 transceiver solutions intended for portable or hand-
held applications such as notebook and palmtop computers. The "U" series is based on Sipex's SP3223/
SP3243 series and has been enhanced for high speed. The data rate is improved to 1000kbps, easily
meeting the demands of high speed RS-232 applications. The SP3223U and SP3243U use an internal
high-efficiency, charge-pumppowersupplythatrequiresonly0.1µFcapacitorsin3.3Voperation. This
chargepumpandSipex'sdriverarchitectureallowtheSP3223U/SP3243UseriestodelivercompliantRS-
232 performance from a single power supply ranging from +3.0V to +5.5V. The SP3223U is a 2-driver/
2-receiverdevice,andtheSP3243Uisa3-driver/5-receiverdevice,idealforlaptop/notebookcomputer
and PDA applications. The SP3243U 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
Components
TTL 3-State
No. of
Pins
Auto-Online
Circuitry
Drivers Receivers
SP3223U
SP3243U
+3.0V to +5.5V
+3.0V to +5.5V
2
3
2
5
4 capacitors
4 capacitors
YES
YES
YES
YES
20
28
Applicable U.S. Patents - 5,306,954; and other patents pending.
Date: 5/25/04
SP3223U/3243U +3.0V to +5.5V RS-232 Transceivers
© Copyright 2004 Sipex Corporation
1