SGS Thomson Microelectronics ST3241ECTR, ST3241ECPR, ST3241ECDR, ST3241ECD, ST3241EBTR Datasheet

1/10October 2002

■ ESD PROTECTION FOR RS-232 I/O PINS:

±8KV IEC 1000-4-2 CONTACT DISCHARGE
±15KV HUMAN BODY MODEL

■ 1µA SUPPLY CURRENT ACHIEVED WHEN

IN AUTO-POWERDOWN

■ 250Kbps MINIMUM GUARANTEED DATA

RATE

■ GUARANTEED 6V/µsSLEWRATERANGE

■ GUARANTEED MOUSE DRIVEABILITY

■ 0.1µF EXTERNAL CAPACITORS

■ MEET EIA/TIA-232SPECIFICATIONSDOWN

TO 3V

■ AVAILABLEIN SO-28, SSOP28 AND

TSSOP28 PACKAGES

DESCRIPTION

The ST3241E device consists of 3 drivers, 5
receivers and a dual charge-pump circuit. The
device meets the requirements of EIA/TIA and
V.28/V.24 comunication standards providing high
data rate capability and enhanced electrostatic
discharge (ESD) protection. All trans mi tter outputs
and receiver input are protected to ±8KV USING
IEC 1000-4-2 contact discharg e and ±15KV using
the H uman B ody Model. The receiver R2 is
always act ive to implement a wake-up feature for
serial port.

The ST3241 E has a proprietary low-dropout
transmitter output stage enabling true RS-232
performance from a 3.0V to 5.5V supply with a
dual charge pump. The device is guaranteed to
run at data rates of 250kbps while maintaining
RS-232 output levels.

It is a complete serial port (3 drivers, 5 receivers)
intended for notebook or subnotebook compute rs.
Receivers R1 and R2 hav e extra out puts in
addition to t heir standard outputs. These ex tra
outputaare always active.
Typical application are in notebook, subnotebook,
palmtop computers, battery-powered equipment,
hand-held equipment, peripherals and printers.

ST3241E

±15KV ESD PROTECTED 3 TO 5.5V, 400KBPS,

RS-232 TRANSCEIVER WITH AUTO-POWERDOWN

SSOP

SOP

TSSOP

ST3241E

2/10

ORDERING CODES

PIN DESCRIPTION

Type

Temperature

Range

Package Comments

ST3241ECD 0 to 70 °C SO-28 (Tube) 27parts per tube / 12tube per box

ST3241EBD -40 to 85 °C SO-28 (Tube) 27parts per tube / 12tube per box
ST3241ECDR 0 to 70 °C SO-28 (Tape & Reel) 1000 parts per reel
ST3241EBDR -40 to 85 °C SO-28 (Tape & Reel) 1000 parts per reel
ST3241ECPR 0 to 70 °C SSOP-28 (Tape & Reel) 1350 parts per reel
ST3241EBPR -40 to 85 °C SSOP-28 (Tape & Reel) 1350 parts per reel
ST3241ECTR 0 to 70 °C TSSOP28 (Tape & Reel) 2500 parts per reel

ST3241EBTR -40 to 85 °C TSSOP28 (Tape & Reel) 2500 parts per reel

PlN N° SYMBOL NAME AND FUNCTION

1C

2

+ Positive Terminal of Inverting Charge Pump Capacitor

2C

2

- Negative Terminal of Inverting Charge Pump Capacitor

3 V- -5.5V Generated by the Charge Pump
4R1

IN

First Receiver Input Voltage

5R2

IN

Second Receiver Input Voltage

6R3

IN

Third Receiver Input Voltage

7R4

IN

Fourth Receiver Input Voltage

8R5

IN

Fifth Receiver Input Voltage

9T1

OUT

First Transmitter Output Voltage

10 T2

OUT

Second Transmitter Output Voltage

11 T3

OUT

Third Transmitter Output Voltage

12 T3

IN

Third Transmitter Input Voltage

13 T2

IN

Second Transmitter Input Voltage

14 T1

IN

First Transmitter Input Voltage

15 R5

OUT

Fifth Receiver Output Voltage

16 R4

OUT

Fourth Receiver Output Voltage

17 R3

OUT

Third Receiver Output Voltage

18 R2

OUT

Second Receiver Output Voltage

19 R1

OUT

First Receiver Output Voltage

20

R2

OUTB

Non-inverting Complementary Receiver Output, always active
for wake-up

21

R1

OUTB

Non-inverting Complementary Receiver Output, always active
for wake-up

22 SHDN

Shutdown Control. Active Low.

23 EN

Receiver Enable. Active Low

24 C

1

- Negative Terminal of Voltage- Charge Pump Capacitor

25 GND Ground
26 V

CC

Supply Voltage

27 V+ 5.5V Generated by the Charge Pump
28 C

1

+ Positive Terminal of Voltage- Charge Pump Capacitor

ST3241E

3/10

PIN CONFIGURATION

SHUTDOWN AND ENABLE CONTROL TRUTH TABLE

ABSOLUTE MAXIMUM RATINGS

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is
not implied.

Note 1: V+ and V- can have magnitude of 7V, but their absolute difference cannot exceed 13V

SHDN EN

T

OUT

R

OUT

R

OUTB

0 0 HIGH Z ACTIVE ACTIVE
0 1 HIGH Z HIGH Z ACTIVE
1 0 ACTIVE ACTIVE ACTIVE
1 1 ACTIVE HIGH Z ACTIVE

Symbol Parameter Value Unit

V

CC

Supply Voltage -0.3 to 6

V

V+

Extra Positive Voltage (Note 1) (V

CC

-0.3) to 7

V

V- Extra negative Voltage (Note 1) 0.3 to -7 V

V+ +|V-| (Note 1) 13 V

SHDN,

EN,

T

IN

Input Voltage -0.3 to 6

V

R

IN

Receiver Input Voltage Range ± 25

V

T

OUT

Transmitter Output Voltage Range ± 13.2

V

R

OUTROUTB

INVALID

Receiver Output Voltage Range -0.3 to (VCC+ 0.3)

V

t

SHORT

Short Circuit Duration on T

OUT

(one at a time) Continuous

T

stg

Storage Temperature Range -65 to 150

°C

ST3241E

4/10

ESD PERFORMANCE: T RANSMITTER OUTPUTS, RECEIVER INPUTS

ELECTRICAL CHARACTERISTICS

(C

1-C4

=0.1µF, VCC=3Vto5.5V,TA= -40 to 85°C, unles s otherwise specified.

Typical values are referred to T

A

=25°C)

LOGIC INPUT AND RECEIVER OUTPUT ELECTRICAL CHARACTERISTICS

(C

1-C4

=0.1µF, VCC=3Vto5.5V,TA= -40 to 85°C, unles s otherwise specified.

Typical values are referred to T

A

=25°C)

RECEIVER OUTPUT ELECTRICAL CHARACTERISTICS

(C

1-C4

=0.1µF, VCC=3Vto5.5V,TA= -40 to 85°C, unles s otherwise specified.

Typical values are referred to T

A

=25°C)

TRANSMITTER EL ECTRICAL CHARACTERISTICS

(C

1-C4

=0.1µF, VCC=3Vto5.5V,TA= -40 to 85°C, unles s otherwise specified.

Typical values are referred to T

A

=25°C)

Symbol Parameter Test Conditions Min. Typ. Max. Unit

ESD ESD Protection Voltage Human Body Model ± 15 KV

ESD ESD Protection Voltage IEC 1000-4-2 (Contact Discharge) ± 8KV

Symbol Parameter Test Conditions Min. Typ. Max. Unit

I

SUPPLY

Supply Current No load VCC= 3.3V or 5V, TA= 25°C 0.3 1 mA

I

SHDN

Shutdown Supply Current SHDN =GND, TA= 25°C 1 10 µA

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

TIL

Input Logic Threshold Low TIN,EN,SHDN 0.8 V

V

TIH

Input Logic Threshold High VCC= 3.3V

V

CC

=5V

2

2.4

V
V

I

IL

Input Leakage Current TIN,EN,SHDN ± 0.01 ± 1.0 µA

Symbol Parameter Test Conditions Min. Typ. Max. Unit

I

OL

Output Leakage Current R

OUT

,EN, Receiver Disabled ± 0.05 ± 10 µA

V

OL

Output Voltage Low I

OUT

= 1.6mA 0.4 V

V

OH

Output Voltage High I

OUT

= -1mA VCC-0.6 VCC-0.1 V

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

TOUT

Output Voltage Swing All Transmitter outputs are loaded with

3KΩ to GND

± 5 ± 5.4 V

R

OUT

Output Resistance VCC=V+=V-=0V V

OUT

= ± 2V 300 10M Ω

I

SC

Output Short Circuit Current VCC= 3.3V ± 35 ± 60 mA

I

L

Output Leackage Current VCC= 0 to 5.5V, trasmitter output = ± 12V,

trasmitter disabled

± 25 mA

V

TO

Transmitter Output Voltage T1IN = T2IN = GND, T3IN = V

CC

T3OUT loaded with 3KΩ to GND
T1OUT and T2OUT loaded with 2.5mA

each

± 5V

ST3241E

5/10

RECEIVER ELECTRICAL CHARACTERISTICS

(C

1-C4

=0.1µF, VCC=3Vto5.5V,TA= -40 to 85°C, unles s otherwise specified.

Typical values are referred to T

A

=25°C)

TIMING CHARACTERISTICS

(C

1-C4

=0.1µF, VCC=3Vto5.5V,TA= -40 to 85°C, unles s otherwise specified.

Typical values are referred to T

A

=25°C)

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

RIN

Receiver Input Voltage
Operating Range

-25 25 V

V

RIL

RS-232 Input Threshold
Low

TA= 25°C VCC= 3.3V
T

A

= 25°C VCC= 5.0V

0.6

0.8

1.2

1.5

V

V

RIH

RS-232 Input Threshold
High

TA= 25°C VCC= 3.3V
T

A

= 25°C VCC= 5.0V

1.5

1.8

2.4

2.4

V

V

RIHYS

Input Hysteresis 0.3 V

R

RIN

Input Resistance TA= 25°C 3 5 7 KΩ

Symbol Parameter Test Conditions Min. Typ. Max. Unit

D

R

Maximum Data Rate RL=3KΩ CL= 1000pF

one trasmitter switching

250 Kbps

t

PHL

t

PLH

Receiver PropagationDelay RINto R

OUT

CL= 150pF 0.15 µs

t

T_SKEW

Transmitter Skew 100 ns

t

R_SKEW

Receiver Skew 300 ns

S

RT

Transition Slew Rate TA= 25°C RL=3Kto7KΩ VCC= 3.3V

measured from +3V to -3V or -3V to +3V
CL= 150pF to 1000pF

C

L

= 150pF to 2500pF

6
4

30
30

V/µs
V/µs

ST3241E

6/10

APPLICATION CIRCUITS

Figure 1 : REQUIRED MINIMUM CAPACITANCE VALUE (µF)

VCC(V) C

1

C2,C3,C

4,

C

BYPASS

3 to 3.6 0.1 0.1 0.1

4.5 to 5.5 0.047 0.33 0.1
3 to 5.5 0.1 0.47 0.1

ST3241E

7/10

DIM.

mm. inch

MIN. TYP MAX. MIN. TYP. MAX.

A 2.65 0.104

a1 0.1 0.3 0.004 0.012

b 0.35 0.49 0.014 0.019

b1 0.23 0.32 0.009 0.012

C 0.5 0.020

c1 45˚ (typ.)

D 17. 70 18.10 0.697 0.713
E 10.00 10.65 0.393 0.419

e 1.27 0.050

e3 16.51 0.650

F 7.40 7.60 0. 291 0.300
L 0.50 1.27 0.020 0.050

S ˚ (max.)

SO-28 MECHANICAL DATA

0016023

8

ST3241E

8/10

DIM.

mm. inch

MIN. TYP MAX. MIN. TYP. MAX.

A 2 0.079

A1 0.050 0.002

A2 1.65 1.75 1.85 0.065 0.069 0.073

b 0.22 0.38 0.009 0.015

c 0.09 0.25 0.004 0.010

D 9.9 10.2 10.5 0.390 0.402 0.413

E 7.4 7.8 8.2 0.291 0.307 0.323

E1 5 5.3 5.6 0.197 0.209 0.220

e 0.65 BSC 0.0256 BSC

K 0˚ 10˚ 0˚ 10˚

L 0.55 0.75 0.95 0.022 0.030 0.037

SSOP28 MECHANICAL DATA

ST3241E

9/10

DIM.

mm. inch

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 0.0089

D 9.6 9.7 9.8 0.378 0.382 0.386

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

TSSOP28 MECHANICAL DATA

0128292B

ST3241E

10/10

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