®
SP3238
Intelligent +3.0V to +5.5V RS-232 Transceiver
FEATURES
1
2
3
4
5
6
7
28
27
26
25
24
23
C2+
GND
C2-
V-
C1+
V+
■ 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
V
CC
C1-
IN
T
T
T
OUT
1
1
SP3238
T
IN
OUT
OUT
2
3
2
22
T
T
IN
®
3
■ AUTO ON-LINE circuitry automatically
R
IN
IN
8
9
21
20
19
18
17
16
R
R
OUT
1
1
wakes up from a 1µA shutdown
■ Minimum 250Kbps data rate under load
■ Regulated Charge Pump Yields Stable
RS-232 Outputs Regardless of VCC
Variations
R
OUT
2
2
10
T
T
OUT
T
IN
4
4
R3IN 11
OUT
R
T
OUT
3
IN
12
5
5
ONLINE 13
R
OUT
1
SHUTDOWN 14
15
STATUS
■ ESD Specifications:
+2kV Human Body Model
Now Available in Lead Free Packaging
DESCRIPTION
The SP3238 device is an RS-232 transceiver solution intended for portable or hand-held
applications such as notebook and palmtop computers. The SP3238 uses 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 SP3238 device to
deliver compliant RS-232 performance from a single power supply ranging from +3.0V to
+5.0V. The SP3238 is a 5-driver/3-receiver device, ideal for laptop/notebook computer and
PDA applications. The SP3238 includes one complementary receiver that remains alert to
monitor an external device's Ring Indicate signal while the device is shutdown.
®
TheAUTOON-LINE featureallowsthedevicetoautomatically"wake-up"duringashutdown
statewhenanRS-232cableisconnectedandaconnectedperipheralisturnedon. Otherwise,
the device automatically shuts itself down drawing less than 1µA.
SELECTION TABLE
AUTO ON-LINE®
Device
Power Supplies RS-232
RS-232
External
TTL 3-State
No. of
Pins
Drivers Receivers Components
Circuitry
SP3220
SP3223
SP3243
SP3238
+3.0V to +5.5V
+3.0V to +5.5V
+3.0V to +5.5V
+3.0V to +5.5V
1
2
3
5
1
2
5
3
4 capacitors
4 capacitors
4 capacitors
4 capacitors
NO
YES
YES
YES
YES
YES
YES
YES
16
20
28
28
Applicable U.S. Patents - 5,306,954; and other patents pending.
Rev. 6/30/03
SP3238 Intelligent +3.0V to +5.5V RS-232 Transceiver
© Copyright 2003 Sipex Corporation
1