SP3249EEY-L Datasheet, PDF (1/16 Pages) Exar Corporation – Intelligent 3.0V to 5.5V RS-232 Transceiver

SP3249E
Intelligent +3.0V to +5.5V RS-232 Transceiver
FEATURES
■ 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
■ Minimum 250Kbps data rate under load
■ Regulated Charge Pump Yields Stable
RS-232 Outputs Regardless of V_CC
Variations
■ Enhanced ESD Specifications:
+15kV Human Body Model
+15kV IEC61000-4-2 Air Discharge
+8kV IEC61000-4-2 Contact Discharge
C2+ 1
GND 2
C2- 3
V- 4
T1OUT 5
T2OUT 6
T3OUT 7
R1IN 8
R2IN 9
T4OUT 10
R3IN 11
T5OUT 12
SP3249E
24 C1+
23 V+
22 VCC
21 C1-
20 T1IN
19 T2IN
18 T3 IN
17 R1OUT
16 R2OUT
15 T4IN
14 R3OUT
13 T5IN
Now Available in Lead Free Packaging
DESCRIPTION
The SP3249E device is an RS-232 transceiver solution intended for portable or hand-held applications
such as notebook and palmtop computers. The SP3249E 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 SP3249E device to deliver compliant RS-232 performance from a single
power supply ranging from +3.0V to +5.5V. The SP3249E is a 5-driver / 3-receiver device that is ideal
for laptop / notebook computer and PDA applications.
Device
SP3223E
SP3243E
SP3238E
SP3239E
SP3249E
Power
Supplies
+3.0V to +5.5V
+3.0V to +5.5V
+3.0V to +5.5V
+3.0V to +5.5V
+3.0V to +5.5V
RS-232
Drivers
2
3
5
5
5
RS-232
Receivers
2
5
3
3
3
External
Components
4 Capacitors
4 Capacitors
4 Capacitors
4 Capacitors
4 Capacitors
Auto
On-Line
Circuitry
YES
YES
YES
NO
NO
SELECTION TABLE
TTL 3-State
# of
Pins
YES
20
YES
28
YES
28
YES
28
NO
24
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com

SP3249E_100_013111