1

Rev. 6/30/03

SP3238 Intelligent +3.0V to +5.5V RS-232 Transceiver

© Copyright 2003 Sipex Corporation

SP3238

Intelligent +3.0V to +5.5V RS-232 Transceiver

The SP3238 device is an RS-232 transceiver solution intended for portable or hand-held

applications such as notebook and palmtop computers. The SP3238 uses an internal

high-efficiency, charge-pump power supply that requires only 0.1µF capacitors in 3.3V

operation. This charge pump and Sipex's driver architecture allow the SP3238 device to

deliver compliant RS-232 performance from a single power supply ranging from +3.0V to

+5.0V. The SP3238 is a 5-driver/3-receiver device, ideal for laptop/notebook computer and

PDA applications. The SP3238 includes one complementary receiver that remains alert to

monitor an external device's Ring Indicate signal while the device is 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.

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

wakes up from a 1µA shutdown

■ Minimum 250Kbps data rate under load

■ Regulated Charge Pump Yields Stable

RS-232 Outputs Regardless of V

CC

Variations

■ ESD Specifications:

+2kV Human Body Model

DESCRIPTION

SELECTION TABLE

Applicable U.S. Patents - 5,306,954; and other patents pending.

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T4IN

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2

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25

26

27

28

5

6

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24

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SHUTDOWN

C2-

V-

R1IN

R2IN

R3IN

ONLINE

C2+

C1-

GND

V+

T1IN

8

9

10

11

18

19

20

21

12

13

14

17

16

15

T1OUT

T2OUT

T3OUT

T3IN

T2IN

T5IN

R3OUT

R2OUT

R1OUT

R1OUT

SP3238

C1+

T4OUT

T5OUT

STATUS

Now Available in Lead Free Packaging