ST ST232AB, ST232AC User Manual

Very high speed, ultra low power consumption

5 V powered RS-232 drivers and receivers

Features

■ Supply voltage range: 4.5 to 5.5 V

■ Supply current no load (typ): 1.5 mA

■ Transmitter output voltage swing (typ): ± 9 V

■ Transition slew rate (typ.): 12 V/µs

■ Receiver propagation delay (typ.): 0.1 µs

■ Receiver input voltage range: ± 30 V

■ Data rate (typ.): 400 kbps/s

■ Operating temperature range:

– -40 to 85 °C
– 0 to 70 °C

SO-16

ST232AB

ST232AC

TSSOP16

Description

The ST232AB/AC is a 2 driver, 2 receiver device
following EIA/TIA-232 and V.28 communication
standard. It is particularly suitable for applications
where ±12 V is not available. The ST232AB/AC
uses a single 5 V power supply and only four
external capacitors (0.1 µF). Typical applications
are in: portable computers, low power modems,
interfaces translation, battery powered RS-232
networks.

Table 1. Device summary

Order codes

ST232ACDR 0 to 70 °C SO-16 (tape and reel) 2500 parts per reel

ST232ABDR -40 to 85 °C SO-16 (tape and reel) 2500 parts per reel

ST232ACTR 0 to 70 °C TSSOP16 (tape and reel) 2500 parts per reel

Temperature

range

Packages Packaging

.

ST232ABTR -40 to 85 °C TSSOP16 (tape and reel) 2500 parts per reel

February 2008 Rev 9 1/16

www.st.com

16

ST232AB - ST232AC

Contents

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

2 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

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

4 Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

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

6 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

7 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

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ST232AB - ST232AC Pin configuration

1 Pin configuration

Figure 1. Pin connections (top view)

Table 2. Pin description

Pin n° Symbol Note

1C

2 V+ Doubled voltage terminal

3C

4C

5C

6 V- Inverted voltage terminal

7T2

8R2

9R2

10 T2

11 T1

12 R1

13 R1

14 T1

15 GND Ground

16 V

+ Positive terminal for the first charge pump capacitor

1

- 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

OUT

OUT

OUT

OUT

CC

Second transmitter output voltage

Second receiver input voltage

IN

Second receiver output voltage

Second transmitter input voltage

IN

First transmitter input voltage

IN

First receiver output voltage

First receiver input voltage

IN

First transmitter output voltage

Supply voltage

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Maximum ratings ST232AB - ST232AC

2 Maximum ratings

Table 3. Absolute maximum ratings

Symbol Parameter Value Unit

V

CC

V+ Extra positive voltage (V

Supply voltage -0.3 to 6 V

- 0.3 to 13.2) V

CC

V- Extra negative voltage 0.3 to -13.2 V

T

R

T

OUT

R

OUT

T

SCTOUT

IN

IN

Transmitter input voltage range -0.3 to (VCC + 0.3) V

Receiver input voltage range ± 30 V

Transmitter output voltage range ± 15 V

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

Short circuit duration on T

OUT

infinite

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

Functional operation under these condition is not implied.

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ST232AB - ST232AC Electrical characteristics

3 Electrical characteristics

Table 4. Electrical characteristics

(C

- C4 = 0.1 µF, VCC = 5 V ± 10 %, TA = -40 to 85 °C, unless otherwise specified. Typical

1

values are referred to T

Symbol Parameter Test condition Min. Typ. Max. Unit

= 25 °C).

A

I

SUPPLY

VCC power supply current No Load, TA = 25°C 1.5 4 mA

Table 5. Transmitter electrical characteristics

(C

- C4 = 0.1 µF, VCC = 5V ± 10 %, TA = -40 to 85 °C, unless otherwise specified. Typical

1

values are referred to T

Symbol Parameter Test condition Min. Typ. Max. Unit

V

TOUT

I

V

V

SR

D

R

TOUT

I

t

1. Measured from 3 V to -3 V or from -3 V to 3 V.

2. One transmitter output is loaded with R

Output voltage swing

Logic pull-up current TIN = 0V 5 40 µA

TIL

Input logic threshold low 0.8 1.4 V

TIL

Input logic threshold high 1.4 2 V

TIH

Transition slew rate

T

Data rate

R

Transmitter output resistance VCC = V+ = V- = 0V V

Transmitter output short circuit

SC

current

Propagation delay time

DT

= 25 °C).

A

All transmitter outputs are loaded
with 3kΩ to GND

= 25°C, VCC = 5V

T

A

RL = 3 to 7kΩ, CL = 50 to 2500pF

(2)

One T

to GND ±7 ±22 mA

XOUT

TTL-CMOS IN to RS-232 OUT

= 150pF (50% to 50%)

C

L

= 3 kΩ to 7 kΩ, CL = 50 to 1000 pF.

L

± 5 ± 9V

(1)

61230V/µs

200 400 kbits/s

= ± 2V 300 Ω

OUT

1.3 3.5 µs

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