SP3244E-SP3245E
3.0V to 5.5V RS-232 Transceivers with Auto On-Line® Plus
FEATURES
• Contains 3-Drivers and 5-Receivers;
Single-chip DTE (PC or terminal) serial port transceiver
• Auto On-line® Plus
• SP3244E slew-controlled to 250Kbps under load
C2+
C2-
V-
C1+
V+
28
27
26
1
2
3
• SP3245E 1Mbps data rate for high-speed RS-232
• Meets true EIA/TIA-232-F and ITU V.28 standards
from a +3.0V to +5.5V power supply
• Adheres to EIA/TIA-562 for interoperability
with EIA/TIA-232 down to a +2.7V supply voltage
• Regulated charge pump yields stable RS-232
outputs regardless of VCC variations
• ESD Specifications:
VCC
GND
R1IN
25
24
23
4
5
6
R2IN
R3IN
C1-
SP3244E
SP3245E
ONLINE
SHUTDOWN
±15KV Human Body Model
±15KV IEC1000-4-2 Air Discharge
± 8KV IEC1000-4-2 Contact Discharge
22
R4IN 7
STATUS
R2OUT
R1OUT
R2OUT
R3OUT
R4OUT
21
20
19
18
R5IN
8
9
T1OUT
T2OUT 10
T3OUT 11
APPLICATIONS
• Portable RS-232
17
16
15
T3IN
12
T2IN 13
T1IN
• Laptops and handheld PCs and PDA
• Cellular telephones, datacables, chargingcradles
• Diagnostic/uploadportsonembeddedapplications
• Use in conjunction with low-voltage UART or
microcontroller
R5OUT
14
•SP3244Eiscross-compatiblewithMAX3244E,
ICL3244E
•SP3245Eiscross-compatiblewithMAX3245E,
ICL3245E
DESCRIPTION
The SP3244E/3245E is a 3-driver/5-receiver device ideal for mobile phone, consumer and PDA
applications. These devices use an internal high-efficiency, charge-pump power supply that requires
only 0.1µF capacitors for 3.3V single-supply operation. This charge pump and Sipex’s driver archi-
tecture allow the SP3244E/3245E to deliver compliant RS-232 performance from a power supply
ranging from +3.0V to +5.5V. At voltages between +2.7V and +3.0V the driver outputs are compliant
with RS-562 and can interface to RS-232 in portable applications.
The Auto On-line® Plus feature allows the device to automatically enter a low power shutdown
mode if all receiver and driver inputs have been idle for 30 seconds. The device will “wake-up” from
this automatic shutdown state upon detecting activity. This power saving feature functions without
system intervention or modifications to software or drivers.
SP3244E supports serial data rates of 250kbps minimum under full load and while maintaining
slew rates of less than 30V/µs. SP3245E is capable of high speed communication of up to 1Mbps.
Rev M 10/9/06
SP3244E-SP3245E, 3.0V to 5.5V RS-232 Transceivers with Auto On-Line® Plus
© Copyright 2006 Sipex Corporation
1