SGS Thomson Microelectronics ST3222CTR, ST3222CDR, ST3222CD, ST3222BDR, ST3222BD Datasheet

3 TO 3.6V, LOW PO WER, UP TO 400KBPS,

RS-232 DRIVERS AND RECEIVERS

■ 300µA SUPPLY CURRENT

■ 250Kbps MINIMUM GUARENTEED DATA

RATE

■ 6V/µs MINIMUM GUARANTEED SLEW RATE

■ MEET EIA/TIA-232SPECIFICATIONSDOWN

TO 3V

■ AVAILABLEINSO-18ANDTSSOP20

ST3222

DESCRIPTION

SOP TSSOP

The ST3222 is a 3V powered EIA/TIA-232 and
V.28/V.24 communications interface with low
power requirements and high data-rate
capabilities. ST3222 has a proprietary low dropout
transmitter output stage providing true RS-232
performance from 3 to 3.6V power supplies. The
device requires only four small 0.1µF standard
external capacitors for operating from 3V s upply.

The ST3222 has t w o r ec eivers and two drivers.
TheST3222featuresa1µA shutdown mode that
reduces power consumption and extends battery
life in portable systems. Its receivers can remain
active in shutdown mode, allowing external
devices s uc h as modems to be moni tored using
only1µAsupply current.

The device is guaranteed to run at da ta rates of
250Kbps while maintaining RS-232 output levels.

Typical applications are Notebook, Subnotebook
and Palmtop Computers, Battery Powered
Equipment, Hand-Held Equipment, Peripherals
and Printers.

ORDERING CODES

Type

ST3222CD 0 to 70 °C SO-18 (Tube) 50parts per tube / 20tube per box

ST3222BD -40 to 85 °C SO-18 (Tube) 50parts per tube / 20tube per box
ST3222CDR 0 to 70 °C SO-18 (Tape & Reel) 1000 parts per reel
ST3222BDR -40 to 85 °C SO-18 (Tape & Reel) 1000 parts per reel
ST3222CTR 0 to 70 °C TSSOP20 (Tape & Reel) 2500 parts per reel

ST3222BTR -40 to 85 °C TSSOP20 (Tape & Reel) 2500 parts per reel

Temperature

Range

Package Comments

1/9October 2002

ST3222

PIN CONFIGURATION

PIN DESCRIPTION

SO-18 TSSOP20

PlN N° (SO-18) PlN N° (TSSP20) SYMBOL NAME AND FUNCTION

1 1 EN Receiver Enable Control. Drive low for normal

operation. Drive high to force the receivers outputs
(R_OUT) into a high-impedance state.

22

+

C

1

Positive Terminal for the first Charge Pump
Capacitor

3 3 V+ 5.5V Generated By The Charge Pump.
44

55

66

-

C

1

+

C

2

-

C

2

Negative Terminal for the first Charge Pump
Capacitor

Positive Terminal for the second Charge Pump
Capacitor

Negative Terminal for the second Charge Pump

Capacitor
7 7 V- -5.5V Generated By The Charge Pump.
88

99

10 10

T2

R2

R2

OUT

IN

OUT

Second Transmitter Output Voltage

Second Receiver Input Voltage

Second Receiver Output Voltage

11 NC Not Connected
11 12
12 13

T2
T1

IN
IN

Second Transmitter Input Voltage
First Transmitter Input Voltage

14 NC Not Connected
13 15
14 16
15 17

R1

T1

R1

OUT

IN

OUT

First Receiver Output Voltage
First Receiver Input Voltage

First Transmitter Output Voltage
16 18 GND Ground
17 19

V

CC

Supply Voltage
18 20 SHDN Active Low Shutdown Control Input. Drive Low To

Shut-down Trnasmittes And Charge Pump

2/9

ST3222

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

V+

V- Inverted Voltage Terminal 0.3 to -7 V

V+ +|V-| 13 V

T

SHDN

R

T

OUT

R

OUT

t

SHORT

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is
not implied. V+ and V- can have a maximum magnitude of +7V, but their absolute addition can not exceed 13 V.

ELECTRICAL CHARACTERISTICS

(C

1-C4

Typical values are referred to T

Symbol Parameter Test Conditions Min. Typ. Max. Unit

I

SUPPLYVCC

I

SHDN

Supply Voltage

CC

Doubled Voltage Terminal (V

Transmitter Input Voltage Range

IN

-0.3 to 6 V

-0.3)to7

CC

-0.3 to 6 V
Transmitter Input Voltage Range -0.3 to 6 V
Receiver Input Voltage Range

IN

Transmitter Output Voltage Range

± 25 V

± 13.2 V

Receiver Output Voltage Range -0.3 to (VCC+ 0.3)
Transmitter Output Short to GND Time

Continuous

=0.1µF, VCC=3Vto3.6V,TA= -40 to 85°C, unles s otherwise specified.

=25°C)

A

Power Supply Current No Load VCC= 3.3V TA=25°C

=V

SHUTDOWN Supply
Current

SHDN
No Load VCC= 3.3V TA=25°C

SHDN

=V

CC

CC

0.3 1 mA

110µA

V

V

LOGIC INPUT ELECTRICAL CHARACTERISTICS

(C
Typical values are referred to T

Symbol Parameter Test Conditions Min. Typ. Max. Unit

Note 1: Transmitter input hysteresis is typically 250mV

=0.1µF, VCC=3Vto3.6V,TA= -40 to 85°C, unles s otherwise specified.

1-C4

=25°C)

A

V

Input Logic Threshold Low T-IN, EN, SHDN (Note 1) 0.8 V

IL

Input Logic Threshold High VCC= 3.3V 2 V

V

IH

V

Transmitter Input

HYS

Histeresys

I

Input Leakage Current T-IN, EN, SHDN ± 0.01 ± 1 µA

IL

0.5 V

TRANSMITTER EL ECTRICAL CHARACTERISTICS

(C
Typical values are referred to T

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

R

=0.1µFVCC=3Vto3.6V,TA= -40 to 85°C, u nless otherwi se specified.

1-C4

TOUT

TOUT

I

TSC

I

TOL

Output Voltage Swing All Transmitter outputs are loaded with

Transmitter Output
Resistance

Output Short Circuit Current ± 60 mA
Output Leakage Current VCC= 0V or 3V to 3.6V V

=25°C)

A

3KΩ to GND
VCC=V+=V-=0V V

= ± 2V 300 10M Ω

OUT

= ± 12V

OUT

Transmitters Disable

± 5 ± 5.4 V

± 25 µA

3/9