Datasheet ST3243ECTR, ST3243ECPR, ST3243ECDR, ST3243ECD, ST3243EBTR Datasheet (SGS Thomson Microelectronics)

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

RS-232 TRANSCEIVER WITH AUTO-POWERDOWN

■ 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, SSOP-28, TSSOP28

AND FLIP-CHIP28 PACKAGES

SOP

ST3243E

Flip-Chip28

DESCRIPTION

The ST3243E 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 Body Model. The receiver R2 is
always act ive to implement a wake-up feature for
serial port.
The ST3243 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 p ump. The device is guarant eed to
run at data rates of 250kbps while maintaining
RS-232 output levels.
The Auto-powerdown feature functions when
FORCEON is low and FORCEOFF

is high. During
this mode of operation, if the device does not
sense a valid RS-232 signal, the driver outputs are

SSOP

disabled. If FORCEOFF

TSSOP

is set low, both drivers
and receivers (expert R2B) are shut off, a nd
supply current is reduced to 1µA. Discon nec ting
the serial port or turning off the peripheral drives
causes the auto-powerdown condition to occur.
Auto-powerdown can be disabled when
FORCEON and FORCEOFF

are high, and should
be done when driving a serial mouse. With
Auto-powerdown enabled, the device is activated
automatically when a valid signal is applied to any
receiverinput.
Typical application are in notebook, subnotebook,
palmtop computers, battery-powered equipme nt,
hand-held equipment, peripherals and printers.

1/14January 2003

ST3243E

ORDERING CODES

Type

Temperature

Range

Package Comments

ST3243ECD 0 to 70 °C SO-28 (Tube) 27parts per tube / 12tube per box

ST3243EBD -40 to 85 °C SO-28 (Tube) 27parts per tube / 12tube per box
ST3243ECDR 0 to 70 °C SO-28 (Tape & Reel) 1000 parts per reel
ST3243EBDR -40 to 85 °C SO-28 (Tape & Reel) 1000 parts per reel
ST3243ECPR 0 to 70 °C SSOP-28 (Tape & Reel) 1350 parts per reel
ST3243EBPR -40 to 85 °C SSOP-28 (Tape & Reel) 1350 parts per reel
ST3243ECTR 0 to 70 °C TSSOP28 (Tape & Reel) 2500 parts per reel

ST3243EBTR -40 to 85 °C TSSOP28 (Tape & Reel) 2500 parts per reel

ST3243ECJ 0 to 70 °C FLIP-CHIP28 coming soon
ST3243EBJ -40 to 85 °C FLIP-CHIP28 coming soon

PIN DESCRIPTION

PlN N° SYMBOL NAME AND FUNCTION

1C
2C
3 V- -5.5V Generated by the Charge Pump

4R1
5R2
6R3
7R4
8R5

9T1
10 T2
11 T3
12 T3
13 T2
14 T1
15 R5
16 R4
17 R3
18 R2
19 R1
20

21 INVALID

22 FORCEOFF

23 FORCEON Drive high to override automatic circuitry keeping transmitters

24 C
25 GND Ground

26 V
27 V+ 5.5V Generated by the Charge Pump

28 C

2/14

+ Positive Terminal of Inverting Charge Pump Capacitor

2

- Negative Terminal of Inverting Charge Pump Capacitor

2

First Receiver Input Voltage
Second Receiver Input Voltage
Third Receiver Input Voltage
Fourth Receiver Input Voltage
Fifth Receiver Input Voltage
First Transmitter Output Voltage
Second Transmitter Output Voltage
Third Transmitter Output Voltage
Third Transmitter Input Voltage
Second Transmitter Input Voltage
First Transmitter Input Voltage
Fifth Receiver Output Voltage
Fourth Receiver Output Voltage
Third Receiver Output Voltage
Second Receiver Output Voltage
First Receiver Output Voltage
Non-inverting Complementary Receiver Output, always active

for wake-up

R2

IN
IN
IN
IN

IN
OUT
OUT
OUT

IN
IN

IN
OUT
OUT
OUT
OUT
OUT

OUTB

Output of the valid signal detector. Indicates if a valid RS-232
level is present on receiver inputs logic "1"

Drive low to shut down transmitters and on-board power
supply. This over-rides all automatic circuitry and FORCEON

on (FORCEOFF

- Negative Terminal of Voltage- Charge Pump Capacitor

1

CC

+ Positive Terminal of Voltage- Charge Pump Capacitor

1

Supply Voltage

must be high)

PIN DESCRIPTION

PlN N° SYMBOL NAME AND FUNCTION

A1 R2
A2 R3
A3 R4
A4 R5
A5 T1
A6 T2
B1 V- -5.5V Generated by the Charge Pump

B2 R1
B3 T3
B4 T3
B5 T1

B6 T2
C1 C
C2 C
C5 R4
C6 R5
D1 C
D2 V+ 5.5V Generated by the Charge Pump

D3 V
D4 FORCEON Drive high to override automatic circuitry keeping transmitters

D5 R1
D6 R3
E1 GND Ground

E2 C
E3 FORCEOFF

E4 INVALID

E5

E6 R2

IN
IN
IN

IN
OUT
OUT

IN
OUT

IN

IN

IN

+ Positive Terminal of Inverting Charge Pump Capacitor

2

- Negative Terminal of Inverting Charge Pump Capacitor

2
OUT
OUT

+ Positive Terminal of Voltage- Charge Pump Capacitor

1

CC

OUT
OUT

- Negative Terminal of Voltage- Charge Pump Capacitor

1

Second Receiver Input Voltage
Third Receiver Input Voltage
Fourth Receiver Input Voltage
Fifth Receiver Input Voltage
First Transmitter Output Voltage
Second Transmitter Output Voltage

First Receiver Input Voltage
Third Transmitter Output Voltage
Third Transmitter Input Voltage
First Transmitter Input Voltage
Second Transmitter Input Voltage

Fourth Receiver Output Voltage
Fifth Receiver Output Voltage

Supply Voltage

on (FORCEOFF

must be high)

First Receiver Output Voltage
Third Receiver Output Voltage

Drive low to shut down transmitters and on-board power
supply. This over-rides all automatic circuitry and FORCEON

Output of the valid signal detector. Indicates if a valid RS-232
level is present on receiver inputs logic "1"

R2

OUTB

OUT

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

Second Receiver Output Voltage

ST3243E

3/14

ST3243E

PIN CONFIGURATION

SOP, SSOP, TSSOP

(top view)

FLIP-CHIP 6x5

(bottom view, bumps side)

INVALID TRUTH TABLE

RS-232 SIGNAL PRESENT AT ANY RECEIVER INPUT INVALID OUTPUT

YES H

NO L

OUTPUT CONTROL TRUTH TABLE

FORCEONFORCE

OFF

X 0 X Shutdown (Force OFF) HIGH Z HIGH Z ACTIVE
11 X

01 YES

01 NO

VALID RECEIVER

LEVEL

OPERATION STATUS

Normal Operating (Force

ON)

Normal Operating

(Auto-powerdown)

Shutdown (Auto-power-

down)

T

OUT

ACTIVE ACTIVE ACTIVE

ACTIVE ACTIVE ACTIVE

HIGH Z ACTIVE ACTIVE

R

OUT

R

2OUTB

4/14

ST3243E

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

CC

V+

V- Inverted Voltage Terminal 0.3 to -7 V

V+ +|V-| 13 V

FORCEON,

FORCEOFF,

T

IN

R

IN

T

OUT

R

OUTROUTB

INVALID

t

SHORT

T

stg

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

ESD PERFORMANCE: T RANSMITTER OUTPUTS, RECEIVER INPUTS

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

Supply Voltage -0.3 to 6
Doubled Voltage Terminal (V

-0.3) to 7

CC

Input Voltage -0.3 to 6

Receiver Input Voltage Range ± 25
Transmitter Output Voltage Range ± 13.2
Receiver Output Voltage Range -0.3 to (VCC+ 0.3)

Short Circuit Duration on T

(one at a time) Continuous

OUT

Storage Temperature Range -65 to 150

V
V

V

V
V

V

°C

ELECTRICAL CHARACTERISTICS

(C
Typical values are referred to T

Symbol Parameter Test Conditions Min. Typ. Max. Unit

I

I

SUPPLY

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

1-C4

=25°C)

A

ASHDN

I

SHDN

Supply Current
Auto-powerdown

Supply Current FORCEON = FORCEOFF =V
Shutdown Supply Current FORCEOFF =GND 1 10 µA

FORCEOFF = GNDFORCEON =V
All R_IN open or grounded

CC

CC

110µA

0.3 1 mA

LOGIC INPUT ELECTRICAL CHARACTERISTICS

(C
Typical values are referred to T

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

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

1-C4

V

TIL

V

TIH

THYS

I

IL

I

OL

V

OL

V

OH

Input Logic Threshold Low T-IN, FORCEON, FORCEOFF 0.8 V
Input Logic Threshold High T-IN, FORCEON, FORCEOFF

Transmitter Input
Hysteresis

Input Leakage Current T-IN, FORCEON, FORCEOFF ± 0.01 ± 1.0 µA
Output Leakage Current Receiver Disabled ± 0.05 ± 10 µA
Output Voltage Low I
Output Voltage High I

=25°C)

A

VCC= 3.3V
V

OUT
OUT

=5V

CC

= 1.6mA 0.4 V
= -1mA VCC-0.6 VCC-0.1 V

2

2.4

0.5 V

V
V

5/14

ST3243E

AUTO-POWERDOWN ELECTRICAL CHARACTERISTICS

(C
Typical v alues are referred to T

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

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

1-C4

= 25°C, FORCEON = GND, FORCEOFF =VCC)

A

V

Receiver InputThreshold to

RITE

INVALID

Output Voltage

HIGH (Fig. 1)
Receiver InputThreshold to

RITD

INVALID

Output Voltage

Positive Threshold 2.7 V
Negative Threshold 2.7 V

LOW (Fig. 1)

V

V

INVALID Output Voltage

IOL

LOW
INVALID Output Voltage

IOH

HIGH
Receiver or Transmitter

t

WU

Edge Transmitter Enabled

I

= 1.6mA 0.4 V

OUT

I

= -1mA VCC-0.6 V

OUT

(Fig. 1)

t

t

Receiver Positive or

invh

Negative Threshold to
INVALID

Receiver Positive or

invL

Negative Threshold to
INVALID

HIGH (Fig. 1)

LOW (Fig. 1)

-0.3 0.3 V

100 µs

0.2 µs

30 µs

TRANSMITTER ELECTRICAL CHARACTERISTICS

(C
Typical v alues are referred to T

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

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

1-C4

TOUT

R

OUT

I

SC

I

L

Output Voltage Swing All Transmitter outputs are loaded with

Output Resistance VCC=V+=V-=0V V
Output Short Circuit Current VCC= 3.3V ± 40 ± 60 mA
Output Leackage Current VCC= 0 to 5.5V,trasmitter output = ± 12V,

= 25°C)

A

3KΩ to GND

= ± 2V 300 10M Ω

OUT

trasmitter disabled

V

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

OT

CC

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

each

± 5 ± 5.4 V

± 25 mA

± 5V

RECEIVER ELECTRICAL CHARACTERISTICS

(C
Typical v alues are referred to T

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

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

1-C4

V

RIN

V

RIL

V

RIH

RIHYS

R

RIN

Receiver Input Voltage
Operating Range

RS-232 Input Threshold
Low

RS-232 Input Threshold
High

Input Hysteresis 0.5 V
Input Resistance TA= 25°C 3 5 7 KΩ

= 25°C)

A

TA= 25°C VCC=3.3V
T

= 25°C VCC=5.0V

A

TA= 25°C VCC=3.3V
T

= 25°C VCC=5.0V

A

-25 25 V

0.6

0.8

1.1

1.4

1.6

1.9

2.4

2.4

V

V

6/14

ST3243E

TIMING CHARACTERISTICS

(C
Typical values are referred to T

Symbol Parameter Test Conditions Min. Typ. Max. Unit

t

T_SKEW

t

R_SKEW

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

1-C4

=25°C)

A

D

Maximum Data Rate RL=3KΩ CL= 1000pF

R

one trasmitter switching

t

PHL

t

Receiver PropagationDelay RINto R

PLH

OUT

CL= 150pF 0.15 µs

Transmitter Skew 150 ns
Receiver Skew 70 ns

S

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

RT

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

= 150pF to 1000pF

C

L

C

= 150pF to 2500pF

L

250 400 Kbps

6
4

30
30

V/µs
V/µs

7/14

ST3243E

APPLICATION CIRCUITS

REQUIRED MINIMUM CAPACITANCE VAL UE (µF)

VCC(V) C

3 to 3.6 0.1 0.1

4.5 to 5.5 0.047 0.33

8/14

1

C2,C3,C4,C

BYPASS

AUTOPOWERDOWN INPUT LEVELS

ST3243E

AUTOPOWERDOWN INPUT TIMING

9/14

ST3243E

SO-28 MECHANICAL DATA

DIM.

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.)

mm. inch

8

10/14

0016023

ST3243E

SSOP28 MECHANICAL DATA

mm. inch

DIM.

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

11/14

ST3243E

TSSOP28 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 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

12/14

0128292B

ST3243E

Flip-Chip28 MECHANICAL DATA

mm. mils

DIM.

MIN. TYP MAX. MIN. TYP. MAX.

A 0.58 0.95 22.8 37.4
A1 0.24 9.4
A2 0.65 25.6

b 0.25 0.30 0.35 9.8 11.8 13.8

D 3.97 4.17 156.3 164.2

D1 2.5 98.4

E 2.47 2.67 97.2 105.1

E1 2 78.7

e 0.45 0.55 17.7 21.7

f 0.23 0.34 9.1 13.4

f1 0.80 0.91 31.5 31.8

7385199/A

13/14

ST3243E

Information furnished is believed to be accurate and reliable. H owever, STMicroelectronics assumes no responsibility for t he
consequences of use of such informatio n nor for any infringement of paten ts or o ther rig hts of t hird part ies which ma y result from
its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications
mentioned in this publicatio n are subject t o change without notice. This publication supersedes and replaces all in formation
previousl y suppl ied. STM icroel ectronics produc ts are not auth orized for use as c ritica l compone nts in l ife s upport dev ices or
systems without express written approval of STMicroelectronics.

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14/14