ST ST3237 User Manual

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ST3237

3 TO 5.5V, 250KBPS, RS-232

TRANSCEIVER WITH STAND-BY

■ 1µA LOW POWER SHUTDOWN WITH

RECEIVER S ACT I VE

■ GUARENTEED DATA RATE

250Kbps (Normal Operation)
1Mbps (Very High Speed Operation)

■ GUARANTEED SLEW RATE RANGE

6V/µs (Normal Operation)
24V/µs (Very High Speed Operation)

■ 0.1µF EXTERNAL CAPACITORS

■ FLOW-THROUGH PINOUT

■ 500µA LOW SUPPLY CURRENT

■ MEET EIA/TIA-232 SPECIFICATIONS DOWN

TO 3V

■ A VAIL ABL E IN SO-2 8 , SSOP-28 AND

TSSOP28

DESCRIPTION

The ST3237 is a 3V to 5.5V powered EIA/TIA-232
and V.28/V.24 communication interfaces high
data-rat e capabilit ies. ST32 37 is a tra nsceive r (5
drivers, 3 receivers) for fast modem applications.
The device has a proprietary low-dropout
transmitter output stage providing true RS-232
performance from a 3V to 5.5V supply using a
dual charge pump. The device is guaranteed to
run at data rates of 250Kbps in the normal

SOP

SSOP

TSSOP

operation mode and 1Mbps in the very high speed
operation mode whi le maintaning RS-232 output
levels.

ORDERING CODES

Type

ST3237CD 0 to 70 °C SO-28 (Tube) 27parts per tube / 12tube per box

ST3237BD -40 to 85 °C SO-28 (Tube) 27parts per tube / 12tube per box
ST3237CDR 0 to 70 °C SO-28 (Tape & Reel) 1000 parts per reel
ST3237BDR -40 to 85 °C SO-28 (Tape & Reel) 1000 parts per reel
ST3237CPR 0 to 70 °C SSOP-28 (Tape & Reel) 1350 parts per reel
ST3237BPR -40 to 85 °C SSOP-28 (Tape & Reel) 1350 parts per reel

ST3237CTR (*) 0 to 70 °C TSSOP28 (Tape & Reel) 2500 parts per reel
ST3237BTR (*) -40 to 85 °C TSSOP28 (Tape & Reel) 2500 parts per reel

(*) Avai l abl e on request

Temperature

Range

Package Comments

1/12May 2002

ST3237

PIN DESCRIPTION

PlN N° SYMBOL NAME AND FUNCTION

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

9
10
11
12
13 EN

14 SHDN
15 VHSCI Very High Speed Control Input. Connect to GND for normal

16
17
18
19
20
21
22
23
24
25
26
27 V+ -5.5V Generated by the Charge Pump
28

+ Positive Terminal of Inverting Charge Pump Capacitor

C

2

- Negative Terminal of Inverting Charge Pump Capacitor

C

2

T1
T2
T3

T4

T5

R1
R2

R3

OUT
OUT
OUT

IN
IN

OUT

IN

OUT

First Transmitter Output Voltage
Second Transmitter Output Voltage
Third Transmitter Output Voltage
First Receiver Input Voltage
Second Receiver Input Voltage
Fourth Transmitter Output Voltage
Third Receiver Input Voltage
Fifth Transmitter Output Voltage
Receiver Enable, Active Low

Shutdown Control, Active Low

operation; connect to VCC for 1Mbps transmission rates.

R1

OUTB

T5

IN

R3

OUT

T4

IN

R2

OUT

R1

OUT

T3

IN

T2

IN

T1

N

C

- Negative Terminal of Voltage- Charge Pump Capacitor

1

V

CC

+ Positive Terminal of Voltage- Charge Pump Capacitor

C

1

Non Inverting Complementary Receiver Output. Always Active.
Fifth Transmitter Input Voltage
Third Receiver Output Voltage
Fourth Transmitter Input Voltage
Second Receiver Output Voltage
First Receiver Output Voltage
Third Transmitter Input Voltage
Second Transmitter Input Voltage
First Transmitter Input Voltage

Supply Voltage

2/12

PIN CONFIGURATION

ST3237

ABSOLUTE MAXIMUM RATINGS

Symbol Parameter Value Unit

V

CC

V+ Doubled Voltage Terminal -0.3 to 7 V

V- Inverted Voltage Terminal 0.3 to -7 V

V+ +|V-| 13 V

T

IN

SHDN

VHSCI

R

IN

T

OUT

R

OUT ROUTB

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.

Supply Voltage

Transmitter Input Voltage Range

-0.3 to 6 V

-0.3 to 6 V

, EN -0.3 to 6 V

Very High Speed Control Input -0.3 to (V
Receiver Input Voltage Range
Transmitter Output Voltage Range

+0.3)

CC

25 V

±

13.2 V

±

Receiver Output Voltage Range -0.3 to (VCC + 0.3)
Short Circuit Durtion on T
Storage Temperature Range

(one at a time)

OUT

Continuous

-65 to 150 °C

V

V

3/12

ST3237

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

SUPPLYVCC

I

SHDN

Power Supply Current No Load VCC = 3V or 5.0V TA = 25°C 0.5 2 mA

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

LOGIC INPUT 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

V

Input Logic Threshold Low

TIL

(Note 1)

V

V

Note 1: Transmitter input hysteresis is ty pi cally 250mV

Input Logic Threshold High

TIH

(Note 1)
Input Leakage Current T-IN, VHSCI, EN, SHDN ±

I

IL

I

Output Leakage Current Receiver Disabled

OL

V

Output Voltage Low I

OL

Output Voltage High I

OH

= 25°C)

A

= 25°C)

A

T-IN, VHSCI, EN, SHDN 0.8 V

VCC = 3.3V
V

= 5V

CC

= 1.6mA 0.4 V

OUT

= -1mA VCC-0.6 VCC-0.1 V

OUT

2

2.4

±

0.01

0.05

±

±

1.0

10

A

µ

V
V

A

µ

A

µ

TRANSMITTER ELECTRICAL CHARACTERISTICS

(C

- C4 = 0.1µF tested at 3.3V±10%, VCC = 3V to 5.5V, TA = -40 to 85°C, unless otherwise specified.

1

Typical values are referred to T

= 25°C)

A

Symbol Parameter Test Conditions Min. Typ. Max. Unit

V

R

Output Voltage Swing All Transmitter outputs are loaded with

TOUT

Transmitter Output

TOUT

Resistance
Output Short Circuit Current

I

SC

3KΩ to GND
VCC = V+ = V- = 0V V

5

±

= ± 2V 3000

OUT

5.4 V

±

25

±

60 mA

±

RECEIVER ELECTRICAL CHARACTERISTICS

(C

- C4 = 0.1µF tested at 3.3V±10%, 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

R

Receiver Input Voltage

RIN

Operating Range
RS-232 Input Threshold

RIL

Low
RS-232 Input Threshold

RIH

High
Input Hysteresis 0.3 V

RIHYS

Input Resistance TA = 25°C 3 5 7 K

RIN

= 25°C)

A

TA = 25°C VCC = 3.3V
T

= 25°C VCC = 5V

A

TA = 25°C VCC = 3.3V
T

= 25°C VCC = 5V

A

-25 25 V

0.6

0.8

1.2

1.5

1.5

1.8

2.4

2.4

Ω

V
V

V
V

Ω

4/12