ST ST232B, ST232C User Manual

5 V powered multi-channel RS-232 drivers and receivers

Features

■ Supply voltage range: 4.5 to 5.5 V

■ Supply current no load (typ.): 5 mA

■ Transmitter output voltage swing (typ): ±7.8 V

■ Controlled output slew rate

■ Receiver input voltage range: ± 30 V

■ Data rate (typ.): 220 kbps

■ Operating temperature range:

– -40 ° to 85 °C
– 0 ° to 70 °C

■ Compatible with MAX232 and MAX202

DIP

SOP Large

ST232B
ST232C

SOP

TSSOP

Description

The ST232 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 ST232 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
system, multi-drop RS-232 networks.

Table 1. Device summary

Order code

ST232CN 0 to 70 °C DIP-16 25 parts per tube / 40 tube per box

ST232CDR 0 to 70 °C SO-16 (tape and reel) 2500 parts per reel

ST232BDR -40 to 85 °C SO-16 (tape and reel) 2500 parts per reel

ST232CWR 0 to 70 °C SO-16 Large (tape and reel) 1000 parts per reel

Temperature

range

Package Packaging

ST232BWR -40 to 85 °C SO-16 Large (tape and reel) 1000 parts per reel

ST232CTR 0 to 70 °C TSSOP16 (tape and reel) 2500 parts per reel

ST232BTR -40 to 85 °C TSSOP16 (tape and reel) 2500 parts per reel

February 2008 Rev 14 1/19

www.st.com

19

ST232B - ST232C

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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

2/19

ST232B - ST232C 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

+ 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

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

16 V

CC

Supply voltage

3/19

Maximum ratings ST232B - ST232C

2 Maximum ratings

Table 3. Absolute maximum ratings

Symbol Parameter Value Unit

V

CC

T

R

T

OUT

R

OUT

T

SCTOUT

T

STG

IN

IN

Supply voltage -0.3 to 6 V

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

Receiver input voltage range ± 30 V

Transmitter output voltage range (V+ + 0.3) to (V- - 0.3) V

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

Short circuit duration on T

OUT

infinite

Storage temperature range -65 to + 150

Note: 1 Absolute maximum ratings are those values beyond which damage to the device may

occur. Functional operation under these condition is not implied.

2 No external supply can be applied to V+ terminal and V- terminal.

4/19

ST232B - ST232C 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 5 10 mA

Table 5. Transmitter 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

V

TOUT

I

V

V

SR

D

R

TOUT

I

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

Input leakage current ± 40 µA

TIL

Input logic threshold low 0.8 V

TIL

Input logic threshold high 2 V

TIH

Transition slew rate

T

Data rate

R

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

Transmitter output short circuit

SC

current

= 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

= 3 kΩ to 7 kΩ, CL = 50 to 1000 pF

L

to GND ±10 ±60 mA

XOUT

± 5 ± 7.8 V

(1)

730V/µs

120 220 kbits/s

= ± 2V 300 Ω

OUT

5/19

Electrical characteristics ST232B - ST232C

Table 6. Receiver 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

V

RIN

R

RIN

V

RIL

V

RIH

V

RIHYS

V

ROL

V

ROH

I

SCR

t

DR

1. RS-232 in to TTL-CMOS out (from 50% to 50%)

Receiver input voltage
operating range

RS-232 input resistance

RS-232 input threshold low TA = 25°C, VCC = 5 V 0.8 1.2 V

RS-232 input threshold high TA = 25°C, VCC = 5 V 1.7 2.4 V

RS-232 input hysteresis VCC = 5V 0.2 0.5 1 V

TTL/CMOS output voltage low I

TTL/CMOS output voltage high I

Receiver output short circuit
current

Receiver propagation delay CL = 150pF

-30 30 V

T

= 25°C, VCC = 5 V,

A

V

= 5V

RIN

= 3.2mA (to VCC)0.4V

OUT

= -1mA (to GND) 3.5 VCC-0.4 V

OUT

357kΩ

±10 mA

(1)

0.3 1 µs

6/19