SP3243E
3 Driver/5 Receiver Intelligent +3.0V to +5.5V
RS-232 Transceivers
FEATURES
1
2
3
4
5
6
7
28
27
26
C2+
C2-
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
V-
25 GND
R1IN
R2IN
R3IN
24
C1-
■ AUTO ON-LINE® circuitry automatically
wakes up from a 1µA shutdown
■ Regulated Charge Pump Yields Stable
RS-232 Outputs Regardless of VCC
Variations
SP3243E
23
ONLINE
22
21
20
19
R4IN
SHUTDOWN
STATUS
R2OUT
8
9
R5IN
T1OUT
T2OUT
T3OUT
10
11
R1OUT
■ Enhanced ESD Specifications:
+15kV Human Body Model
18 R2OUT
T3IN 12
17
16
15
R3OUT
R4OUT
R5OUT
+15kV IEC1000-4-2 Air Discharge
+8kV IEC1000-4-2 Contact Discharge
■ 250 Kbps min. transmission rate (EB)
■ 1000 Kbps min. transmission rate (EU)
■ Ideal for High Speed RS-232 Applications
13
14
T2IN
T1IN
Now Available in Lead Free Packaging
DESCRIPTION
The SP3243E products are 3 driver/5 receiver RS-232 transceiver solutions intended for portable
or hand-held applications such as notebook and palmtop computers. The SP3243E includes one
complementary receiver that remains alert to monitor an external device's Ring Indicate signal while
the device is shutdown. The SP3243E and EB devices feature slew-rate limited outputs for reduced
crosstalk and EMI. The "U" and "H" series are optimized for high speed with data rates up to 1Mbps,
easily meeting the demands of high speed RS-232 applications. The SP3243E series 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 SP3243E series to deliver compliant RS-232
performance from a single power supply ranging from +3.0V to +5.5V. The AUTO ON-LINE® feature
allows the device to automatically "wake-up" during a shutdown state when an RS-232 cable is con-
nected 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
Drivers Receivers Components On-Line
Circuitry State
External
Auto
TTL # of Data ESD
3-
Pins Rate Rating
SP3243E +3.0V to +5.5V
SP3243EB +3.0V to +5.5V
SP3243EH +3.0V to +5.5V
SP3243EU +3.0V to +5.5V
3
3
3
3
5
5
5
5
4 Capacitors
4 Capacitors
4 Capacitors
4 Capacitors
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
28
28
28
120
250
460
15kV
15kV
15kV
28 1000 15kV
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
SP3243E_100_072309
1