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

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

ST3222

RECEIVER ELECTRICAL CHARACTERISTICS

(C
Typical values are referred to T

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

TIMING CHARACTERISTICS

(C
Typical values are referred to T

Symbol Parameter Test Conditions Min. Typ. Max. Unit

-t

|t

-t

Transmitter Skew is measured at the transmitter zero cross points

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

1-C4

=25°C)

A

Output Leakage Current R-OUT, EN =VCC, Receiver Disabled ± 0.05 ± 10 µA

I

OL

V

V
V

R

V

V

1-C4

Receiver Input Voltage

RIN

Operating Range
Input Threshold Low TA= 25°C VCC= 3.3V 0.6 1.2 V

RIL

Input Threshold High TA= 25°C VCC= 3.3V 1.5 2.4 V

RIH

Input Hysteresis 0.5 V

RIHYS

Input Resistance TA= 25°C 3 5 7 KΩ

RIN

TTL/CMOS Output Voltage

ROL

Low
TTL/CMOS Output Voltage

ROH

High

I

= 1.6mA 0.4 V

OUT

I

= -1mA VCC-0.6 VCC-0.1 V

OUT

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

=25°C)

A

D

Data Transfer Rate RL=3KΩ CL2= 1000pF

R

one trasmitter switching

t

PHLR

t

PLHR

|t

PHLT

THL

t

OER

t

ODR

PHLR

THR

S

Propagation Delay Input to
Output

Transmitter Propagation
Delay Difference

|

Receiver Output Enable
Time

Receiver Output Disable
Time

Receiver PropagationDelay
Difference

|

Trnasition Slew Rate TA= 25°C RL=3KΩto 7KΩ VCC= 3.3V

RT

R

XIN

to R

XOUT

CL= 150pF 0.2 µs

(Note 1) 100 ns

Normal Operation 200 ns

Normal Operation 200 ns

measured from +3V to -3V or -3V to +3V

= 150pF to 1000pF

C

L

C

= 150pF to 2500pF

L

-25 25 V

240 400 Kbps

50 ns

6
4

30
30

V/µs
V/µs

4/9

APPLICATION CIRCUITS

ST3222

CAPACITANCE VALUE (µF)

C1 C2. C3 C4 Cbypass

0.1 0.1 0.1 0.1 0.1

5/9

ST3222

TYPICAL PERFORM ANCE CHARA CTERISTICS (unless otherwise specified Tj= 25°C)
Figure 1 : Driver Voltage Transfer Charac teristics

for Trasmitter Inputs

Figure 3 : Output Current vs Output Low Voltage

Figure 2 : Driver Voltage Transfer Charac teristics

for Receiver Inputs

Figure 4 : Output Current vs Output High Voltage

6/9

SO-18 MECHANICAL DATA

ST3222

DIM.

MIN. TYP MAX. MIN. TYP. MAX.

A 2.35 2.65 0.092 0.104
A1 0.1 0.3 0.004 0.012
A2 2.55 0.100

B 0.33 0.51 0.013 0.020

C 0.23 0.32 0.009 0.012

D 11.35 11.75 0.447 0.462

E 7.4 7.6 0.291 0.299

e 1.27 0.050

H 10.00 10.65 0.393 0.419

h 0.25 0.75 0.010 0.029

k8 ˚ (max.)

L 0.4 1.27 0.016 0.050

mm. inch

Be

0.10mm
.004

Seating Plane

D

1018

19

A2

h x 45û

A

K

L

A1 C

H

E

SO18

0070768

7/9

ST3222

TSSOP20 MECHANICAL DATA

mm. inch

DIM.

MIN. TYP MAX. MIN. TYP. MAX.

A 1.2 0.047

A1 0.05 0.15 0.002 0.004 0.006

A2 0.8 1 1.05 0.031 0.039 0.041

b 0.19 0.30 0.007 0.012

c 0.09 0.20 0.004 0.0079

D 6.4 6.5 6.6 0.252 0.256 0.260

E 6.2 6.4 6.6 0.244 0.252 0.260

E1 4.3 4.4 4.48 0.169 0.173 0.176

e 0.65 BSC 0.0256 BSC

K0˚ 8˚0˚ 8˚

L 0.45 0.60 0.75 0.018 0.024 0.030

A2

A

A1

b

e

K

c

L

E

D

E1

PIN 1 IDENTIFICATION

8/9

1

0087225C

ST3222

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its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications
mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information
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systems without express written approval of STMicroelectronics.

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