SP3238E
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
VCC
C1-
T IN
1
T OUT
1
■ 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
SP3238E
T
IN
T OUT
2
2
22
T
OUT
T
IN
3
3
R IN
8
9
21 R OUT
1
1
R
IN
20
19
18
17
R
OUT
2
2
10
T OUT
T IN
4
4
R
IN 11
R
T
OUT
IN
3
3
■ Enhanced ESD Specifications:
+15kV Human Body Model
T
OUT
12
5
5
ONLINE 13
16 R OUT
1
+15kV IEC61000-4-2 Air Discharge
+8kV IEC61000-4-2 Contact Discharge
SHUTDOWN 14
15
STATUS
Now Available in Lead Free Packaging
DESCRIPTION
The SP3238E device is an RS-232 transceiver solution intended for portable or hand-held applications
such as notebook and palmtop computers.The SP3238E uses an internal high-efficiency, charge-pump
power supply that requires only 0.1µF capacitors in 3.3V operation. This charge pump and Exar's driver
architecture allow the SP3238E device to deliver compliant RS-232 performance from a single power
supply ranging from +3.0V to +5.5V. The SP3238E is a 5-driver / 3-receiver device that is ideal for laptop
/ notebook computer and PDA applications. The SP3238E 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
RS-232
RS-232
External
Auto
TTL 3-State
# of
Supplies
Drivers Receivers Components On-Line
Pins
Circuitry
SP3220E
SP3223E
SP3243E
SP3238E
+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
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
SP3238E_100_020111
1