SP3244E Datasheet, PDF (1/22 Pages) Sipex Corporation – 3.0V to 5.5V RS-232 Transceivers with Auto On-Line® Plus

SP3244E-SP3245E
3.3V or 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
• 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:
±15KV Human Body Model
C2+ ₁
^{C2- 2}
V- ₃
R1IN ₄
R2IN 5
R3IN 6
R4IN 7
28 C1+
27 V+
26 VCC
25 ^GND
24 C1-
SP3244E 23 ONLINE
SP3245E _{22 SHUTDOWN}
R5IN 8
21 STATUS
APPLICATIONS
• Portable RS-232
• Laptops and handheld PCs and PDA
• Cellular telephones, datacables, charging-
cradles
• Diagnostic/upload ports on embedded applica-
tions
• Use in conjunction with low-voltage UART or
microcontroller
• SP3244 is cross-compatible with MAX3244,
ICL3244
• SP3245 is cross-compatible with MAX3245,
ICL3245
T1OUT 9
T2OUT 10
T3OUT 11
T3IN 12
T2IN 13
T1IN 14
20 R2OUT
19 R1OUT
18 R2OUT
17 R3OUT
16 R4OUT
15 R5OUT
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 Exar’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.
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com

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