SGS Thomson Microelectronics ST3243CTR, ST3243CPR, ST3243CDR, ST3243BTR, ST3243BPR Datasheet

ST3243

3 TO 5.5V, 400KBPS, RS-232

TRANSCEIVER WITH AUTO-POWERDOWN

■ 1µA SUPPLY CURRENT ACHIEVED WHEN

IN AUTO-POWERDOWN

■ 250Kbps MINIMUM GUARANTEED DATA

RATE

■ GUARANTEED 6V/µs SLEW RATE RANGE

■ GUARANTEED MOUSE DRI VEABILITY

■ 0.1µF EXTERNAL CAPACITORS

■ MEET EIA/TIA-232 SPECIFICATIONS DOWN

TO 3V

■ A VAILABL E IN SO-28, SSOP-28 AND

TSSOP28

DESCRIPTION

The ST3243 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 comuni cation standards providing hi gh
data rate capability.

The receiver R2 is always active to implement a
wake-up feature for serial port.

The ST3243 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.

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
disabled. If FORCEOFF

is set low, both drivers
and receivers (expert R2B) are shut off, and
supply current is reduced to 1mA. Disconnecting

SOP

SSOP

TSSOP

the serial port or turning off the p eripheral 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 enable d, the d evice is act ivated
automatically when a valid signal is applied to any
receiver i nput.
Typical application are in notebook, subnot ebook,
palmtop computers, battery-powered equipment,
hand-held equipment, peripherals and printers.

1/11May 2002

ST3243

ORDERING CODES

Type

Temperature

Range

Package Comments

ST3243CD 0 to 70 °C SO-28 (Tube) 27parts per tube / 12tube per box

ST3243BD -40 to 85 °C SO-28 (Tube) 27parts per tube / 12tube per box
ST3243CDR 0 to 70 °C SO-28 (Tape & Reel) 1000 parts per reel
ST3243BDR -40 to 85 °C SO-28 (Tape & Reel) 1000 parts per reel
ST3243CPR 0 to 70 °C SSOP-28 (Tape & Reel) 1350 parts per reel
ST3243BPR -40 to 85 °C SSOP-28 (Tape & Reel) 1350 parts per reel
ST3243CTR 0 to 70 °C TSSOP28 (Tape & Reel) 2500 parts per reel

ST3243BTR -40 to 85 °C TSSOP28 (Tape & Reel) 2500 parts per reel

PIN DESCRIPTION

PlN N° SYMBOL NAME AND FUNCTION

+ Positive Terminal of Inverting Charge Pump Capacitor

1
2
3 V- -5.5V Generated by the Charge Pump
4
5
6
7
8

9
10
11
12
13
14
15
16
17
18
19

20

21

22

23
24

25 GND Ground
26
27 V+ 5.5V Generated by the Charge Pump
28

C

2

C

- Negative Terminal of Inverting Charge Pump Capacitor

2

R1

IN

R2

IN

R3

IN

R4

IN

R5

IN

T1

OUT

T2

OUT

T3

OUT

T3

IN

T2

IN

T1

IN

R5

OUT

R4

OUT

R3

OUT

R2

OUT

R1

OUT

R2

OUTB

INVALID

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
Output of the valid signal detector. Indicates if a valid RS-232

level is present on receiver inputs logic "1"

FORCEOFF

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

FORCEON Drive high to override automatic circuitry keeping transmitters

on (FORCEOFF

- Negative Terminal of Voltage- Charge Pump Capacitor

C

1

V

CC

+ Positive Terminal of Voltage- Charge Pump Capacitor

C

1

Supply Voltage

must be high)

2/11

PIN CONFIGURATION

ST3243

TRUTH TABLE

FORCE OFF

T

OUT

R

OUT

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

* If the part is in auto-powerdown mode (FORCE OFF = VCC, FORCE ON = GND) it is shutdown , if no valid R S- 232 levels are present on
all receiver input

R

2OUTB

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

OUT ROUTB

INVALID

t

SHORT

T

stg

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

(*) The device doesn’t m eet 1KV ESD HBM

Supply Voltage
Doubled Voltage Terminal (V

Input Voltage

Receiver Input Voltage Range
Transmitter Output Voltage Range
Receiver Output Voltage Range

Short Circuit Duration on T

(one at a time)

OUT

Storage Temperature Range

-0.3 to 6 V

-0.3) to 7

CC

-0.3 to 6 V

25 V

±

13.2 V

±

-0.3 to (V

CC

+ 0.3)

Continuous

-65 to 150 °C

V

V

3/11

ST3243

ELECTRICAL CHARACTERISTICS

- C4 = 0.1µF, VCC = 3V to 5.5V, TA = -40 to 85°C, unless otherwise specified.

(C

1

Typical values are referred to T

Symbol Parameter Test Conditions Min. Typ. Max. Unit

I

ASHDN

I

SHDN

I

SHDN

Supply Current
Auto-powerdown

Shutdown Supply Current VCC = 3.3 or 5.0V TA = 25°C

Supply Current
Auto-powerdown Disabled

LOGIC INPUT ELECTRICAL CHARACTERISTICS

(C

- C4 = 0.1µF, VCC = 3V to 5.5V, TA = -40 to 85°C, unless otherwise specified.

1

Typical values are referred to T

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

V

V

V

V

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

TIL

Input Logic Threshold High T-IN, FORCEON, FORCEOFF

TIH

Transmitter Input

THYS

Hysteresis

I

Input Leakage Current T-IN, FORCEON, FORCEOFF ±

IL

I

Output Leakage Current Receiver Disabled

OL

Output Voltage Low I

OL

Output Voltage High I

OH

= 25°C)

A

VCC = 3.3 or 5.0V TA = 25°C

All R_IN open FORCEOFF

All R_IN open FORCEOFF
VCC = 3.3 or 5.0V TA = 25°C
FORCEON = FORCEOFF

= 25°C)

A

VCC = 3.3V
V

= 5V

CC

= 1.6mA 0.4 V

OUT

= -1mA VCC-0.6 VCC-0.1 V

OUT

= V

CC

= GND

= VCCNo Load

2

2.4

110

110

0.3 1 mA

0.5 V

±

0.01

0.05

1.0

±

10

±

A

µ

A

µ

V
V

A

µ

A

µ

AUTO-POWERDOWN ELECTRICAL CHARACTERISTICS

(C

- C4 = 0.1µF, VCC = 3V to 5.5V, TA = -40 to 85°C, unless otherwise specified.

1

Typical values are referred to T

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

V

V

V

t

t

Receiver Input Threshold to

RITE

Transmitter Enabled
Receiver Input Threshold to

RITD

Transmitter Disabled
INVALID Output Voltage

IOL

LOW
INVALID Output Voltage

IOH

HIGH
Receiver Threshold to

t

WU

Transmitter Enabled
Receiver Positive or

invh

Negative Threshold to
INVALID

Receiver Positive or

invL

Negative Threshold to
INVALID

HIGH

LOW

= 25°C)

A

Positive Threshold

2.7 V

Negative Threshold 2.7
1µA Supply Current -0.3 0.3 V

0.4 V

VCC-0.6 V

I

= 1.6mA 250

OUT

I

= -1mA 1

OUT

30

V

s

µ

s

µ

s

µ

4/11