ST ST3232EB, ST3232EC User Manual

± 15 kV ESD protection 3 to 5.5 V low power,

up to 250 kbps, RS-232 drivers and receivers

Features

■ ESD protection for RS-232 I/O pins

■ ±15 kV human body model

■ ±8 kV IEC 1000-4-2 contact discharge

■ 300 µA supply current

■ 250 kbps minimum guaranteed data rate

■ 6 V/µs minimum guaranteed slew rate

■ Meet EIA/TIA-232 specifications down to 3 V

■ Available in SO-16, SO-16 large and TSSOP16

SO-16

ST3232EB
ST3232EC

SO-16 Large

Applications

■ Notebook, subnotebook and palmtop

computers

■ Battery powered equipment

■ Hand-held equipment

■ Peripherals and printers

small 0.1 µF standard external capacitors for
operations from 3 V supply.

The ST3232E has two receivers and two drivers.

The device is guaranteed to run at data rates of
250 kbps while maintaining RS-232 output levels.

TSSOP16

Description

The ST3232E is a 3 V powered EIA/TIA-232 and
V.28/V.24 communication interfaces with low
power requirements, high data-rate capabilities
and enhanced electrostatic discharge (ESD)
protection to ± 8 kV using IEC1000-4-2 contact
discharge and ± 15 kV using the human body
model. ST3232E has a proprietary low dropout
transmitter output stage providing true RS-232
performance from 3 to 5 V supplies with a dual
charge pump. The charge pump requires only four

Table 1. Device summary

Order codes Temperature range Packages Packaging

ST3232ECDR 0 to 70 °C SO-16 (tape and reel) 2500 parts per reel

ST3232EBDR -40 to 85 °C SO-16 (tape and reel) 2500 parts per reel

ST3232ECTR 0 to 70 °C TSSOP16 (tape and reel) 2500 parts per reel

ST3232EBTR -40 to 85 °C TSSOP16 (tape and reel) 2500 parts per reel

January 2010 Doc ID 8784 Rev 6 1/17

www.st.com

17

Contents ST3232EB, ST3232EC

Contents

1 Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3

2 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

3 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

4 Application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

5 Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

2/17 Doc ID 8784 Rev 6

ST3232EB, ST3232EC Pin configuration

1 Pin configuration

Figure 1. Pin connection

Table 2. Pin description

Pin n° Symbol Name and function

1C

+ Positive terminal for the first charge pump capacitor

1

2 V+ Doubled voltage terminal

3C

4C

5C

- Negative Terminal for the first charge pump capacitor

1

+ Positive terminal for the second charge pump capacitor

2

- Negative terminal for the second charge pump capacitor

2

6 V- Inverted voltage terminal

7T2

8R2

9R2

10 T2

11 T1

12 R1

13 R1

14 T1

OUT

IN

OUT

IN

IN

OUT

IN

OUT

Second transmitter output voltage

Second receiver input voltage

Second receiver output voltage

Second transmitter input voltage

First transmitter input voltage

First receiver output voltage

First receiver input voltage

First transmitter output voltage

15 GND Ground

16 V

CC

Supply voltage

Doc ID 8784 Rev 6 3/17

Absolute maximum ratings ST3232EB, ST3232EC

2 Absolute maximum ratings

Table 3. Absolute maximum ratings

Symbol Parameter Value Unit

V

CC

V+ Doubled voltage terminal (V

V- Inverted voltage terminal 0.3 to -7 V

V+ +|V-| 13 V

T

IN

R

IN

T

OUT

R

OUT

t

SHORT

Supply voltage -0.3 to 6 V

- 0.3) to 7 V

CC

Transmitter input voltage range -0.3 to 6 V

Receiver input voltage range ± 25 V

Transmitter output voltage range ± 13.2 V

Receiver output voltage range -0.3 to (VCC + 0.3) V

Transmitter output short to gnd time Continuous

Note: Absolute maximum ratings are those values beyond which damage to the device may occur.

Functional operation under these condition is not implied.

Externally applied V+ and V- can have a maximum magnitude of +7 V, but their absolute
addition can not exceed 13 V.

Running on internal charge pump, intrinsic self limitation allows exceeding those values
without any damage.

Startup voltage sequence (V

, then V+, then V-) is critical, therefore it is not recommended

CC

to use this device using externally applied voltage to V+ and V-.

Figure 2. ESD performance: transmitter 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 ±8kV

4/17 Doc ID 8784 Rev 6

ST3232EB, ST3232EC Electrical characteristics

3 Electrical characteristics

C1 - C4 = 0.1 µF, VCC = 3 V to 5.5 V, TA = -40 to 85 °C, unless otherwise specified. Typical
values are referred to T

Table 4. Electrical characteristics

Symbol Parameter Test conditions Min. Typ. Max. Unit

= 25 °C.

A

I

SUPPLYVCC

Power supply current No Load, VCC = 3V or 5V, TA = 25°C 0.3 1 mA

C1 - C4 = 0.1 µF, VCC = 3 V to 5.5 V, TA = -40 to 85 °C, unless otherwise specified. Typical
values are referred to T

TIL

TIH

IL

Input logic threshold low T-IN 0.8 V

Transmitter input hysteresis 0.25 V

Input logic threshold high

Input leakage current T-IN ± 0.01 ± 1µA

Table 5. Logic input

Symbol Parameter Test conditions Min. Typ. Max. Unit

V

V

HYS

V

I

= 25 °C.

A

V

= 3.3V 2

CC

= 5V 2.4

V

CC

C1 - C4 = 0.1 µF tested at 3.3 V ± 10 %, VCC = 3 V to 5.5 V, TA = -40 to 85 °C, unless
otherwise specified. Typical values are referred to T

Table 6. Transmitter

Symbol Parameter Test conditions Min. Typ. Max. Unit

V

TOUT

R

TOUT

I

SC

I

TOL

Output voltage swing

Transmitter output
resistance

All transmitter outputs are loaded with
3kΩ to GND

V

CC

= 0V, V

= ± 2V 300 10M Ω

OUT

Output short circuit current ± 60 mA

V

= 0V or 3.3V to 5.5V

Output leakage current

V

CC

OUT

= ± 12V

Transmitters disable

= 25 °C.

A

± 5 ± 5.4 V

± 25 µA

V

Doc ID 8784 Rev 6 5/17

Electrical characteristics ST3232EB, ST3232EC

C1 - C4 = 0.1 µF tested at 3.3 V ± 10 %, VCC = 3 V to 5.5 V, TA = -40 to 85 °C, unless
otherwise specified. Typical values are referred to T

Table 7. Receiver

Symbol Parameter Test conditions Min. Typ. Max. Unit

= 25 °C.

A

V

RIN

V

Receiver input voltage operating
range

RS-232 Input threshold low

RIL

-25 25 V

T

= 25°C, VCC = 3.3V 0.6 1.1

A

= 25°C, VCC = 5V 0.8 1.5

T

A

TA = 25°C, VCC = 3.3V 1.4 2.4

V

V

RIHYS

R

V

V

RIH

RIN

ROL

ROH

RS-232 Input threshold high

= 25°C, VCC = 5V 1.8 2.4

T

A

Input hysteresis 0.5 V

Input resistance TA = 25°C 3 5 7 kΩ

TTL/CMOS Output voltage low I

TTL/CMOS Output voltage high I

= 1.6mA 0.4 V

OUT

= -1mA VCC-0.6 VCC-0.1 V

OUT

C1 - C4 = 0.1 µF tested at 3.3 V ± 10 %, VCC = 3 V to 5.5 V, TA = -40 to 85 °C, unless
otherwise specified. Typical values are referred to T

Table 8. Timing characteristics

Symbol Parameter Test conditions Min. Typ. Max. Unit

D

R

t

PHLR

tPLHR

t

OER

t

ODR

|t

PHLT

- t

THL

|t

PHLR

- t

THR

S

RT

1. Transmitter skew is measured at the transmitter zero cross points.

R

= 3KΩ, CL2= 1000pF

Data transfer rate

Propagation delay input to
output

L

one transmitter switching

= R

R

XIN

, CL = 150pF 0.15 µs

XOUT

Receiver output enable time Normal Operation 50 ns

Receiver output disable time Normal Operation 50 ns

Transmitter propagation

|

delay difference

(1)

Receiver propagation delay

|

difference

= 25°C RL = 3kΩ to 7kΩ VCC = 3.3V

T

A

Transition slew rate

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

= 150pF to 1000pF

C

L

CL = 150pF to 2500pF

= 25 °C

A

250 kbps

200 ns

50 ns

6

3030V/µs

4

V

V

V/µs

6/17 Doc ID 8784 Rev 6