1

Rev. 7/8/03

SP3220B/U +3.0 to +5.0V RS-232 Transceivers

© Copyright 2003 Sipex Corporation

High Speed +3.0V to +5.5V RS-232 Driver/Receiver Pair

SP3220B/U

DESCRIPTION

■ Meets True RS-232 Protocol Operation

From A +3.0V to +5.5V Power Supply

■ Minimum 250 Kbps Data Rate

(SP3220B) or 1Mbps Data Rate

(SP3220U) under Fully Load

■ 1µA Low-Power Shutdown With

Receivers Active

■ Interoperable With EIA/TIA - 232 and

adheres to EIA/TIA - 562 Down to

+2.7V Power Source

■ Pin-Compatible With The

MAX3221E Device Without

The

■ ESD Specifications:

+2kV Human Body Model

The SP3220B/U device is an RS-232 driver/receiver solution intended for portable or hand-held

applications such as notebook or palmtop computers. The SP3220B/U device has a high-

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

charge pump allows the SP3220B/U device to deliver true RS-232 performance from a single

power supply ranging from +3.3V to +5.0V.

The SP3220B/U device has a low-power shutdown mode where the driver outputs and charge

pumps are disabled. During shutdown, the supply current falls to less than 1µA.

SP3220B/U

2

4

6

5

3

7

15

GND

T1IN

T1OUT

C1+

C1-

C2+

C2-

V+

V-

11

0.1µF

0.1µF

0.1µF

+

C2

C5

C1

+

+

*C3

C4

+

+

0.1µF

0.1µF

13

RS-232

OUTPUTS

RS-232

INPUTS

LOGIC

INPUTS

14

5kΩ

R1IN

R1OUT

9

8

LOGIC

OUTPUTS

*can be returned to

EN

1

SHDN

16

®