ST232B
ST232C
5 V powered multi-channel RS-232 drivers and receivers
Features
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■
■
■
■
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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
SOP Large
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
Temperature
range
0 to 70 °C
0 to 70 °C
-40 to 85 °C
0 to 70 °C
-40 to 85 °C
0 to 70 °C
-40 to 85 °C
Package
DIP-16
SO-16 (tape and reel)
SO-16 (tape and reel)
SO-16 Large (tape and reel)
SO-16 Large (tape and reel)
TSSOP16 (tape and reel)
TSSOP16 (tape and reel)
Rev 14
Packaging
25 parts per tube / 40 tube per box
2500 parts per reel
2500 parts per reel
1000 parts per reel
1000 parts per reel
2500 parts per reel
2500 parts per reel
1/19
www.st.com
19
Order code
ST232CN
ST232CDR
ST232BDR
ST232CWR
ST232BWR
ST232CTR
ST232BTR
February 2008
ST232B - ST232C
Contents
1
2
3
4
5
6
7
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Typical application . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Typical performance characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
2/19
ST232B - ST232C
Pin configuration
1
Figure 1.
Pin configuration
Pin connections (top view)
Table 2.
Pin n°
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Pin description
Symbol
C
1
+
V+
C
1
-
C
2
+
C
2
-
V-
T2
OUT
R2
IN
R2
OUT
T2
IN
T1
IN
R1
OUT
R1
IN
T1
OUT
GND
V
CC
Note
Positive terminal for the first charge pump capacitor
Doubled voltage terminal
Negative terminal for the first charge pump capacitor
Positive terminal for the second charge pump capacitor
Negative terminal for the second charge pump capacitor
Inverted voltage terminal
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
Ground
Supply voltage
3/19
Maximum ratings
ST232B - ST232C
2
Table 3.
Symbol
V
CC
T
IN
R
IN
T
OUT
R
OUT
T
SCTOUT
T
STG
Maximum ratings
Absolute maximum ratings
Parameter
Supply voltage
Transmitter input voltage range
Receiver input voltage range
Transmitter output voltage range
Receiver output voltage range
Short circuit duration on T
OUT
Storage temperature range
Value
-0.3 to 6
-0.3 to (V
CC
+ 0.3)
±
30
(V
+
+ 0.3) to (V
-
- 0.3)
-0.3 to (V
CC
+ 0.3)
infinite
-65 to + 150
Unit
V
V
V
V
V
Note:
1
2
Absolute maximum ratings are those values beyond which damage to the device may
occur. Functional operation under these condition is not implied.
No external supply can be applied to V+ terminal and V- terminal.
4/19
ST232B - ST232C
Electrical characteristics
3
Table 4.
Electrical characteristics
Electrical characteristics
(C
1
- C
4
= 0.1 µF, V
CC
= 5 V ± 10 %, T
A
= -40 to 85 °C, unless otherwise specified. Typical
values are referred to T
A
= 25 °C).
Parameter
V
CC
Power supply current
Test condition
No Load, T
A
= 25°C
Min.
Typ.
5
Max.
10
Unit
mA
Symbol
I
SUPPLY
Table 5.
Transmitter electrical characteristics
(C
1
- C
4
= 0.1 µF, V
CC
= 5 V ± 10 %, T
A
= -40 to 85 °C, unless otherwise specified. Typical
values are referred to T
A
= 25 °C).
Parameter
Output voltage swing
Input leakage current
Input logic threshold low
Input logic threshold high
Transition slew rate
Data rate
Transmitter output resistance
Transmitter output short circuit
current
T
A
= 25°C, V
CC
= 5V
R
L
= 3 to 7kΩ C
L
= 50 to 2500pF
(1)
,
(2)
Symbol
V
TOUT
I
TIL
V
TIL
V
TIH
SR
T
D
R
R
TOUT
I
SC
Test condition
All transmitter outputs are loaded
with 3kΩ to GND
Min.
±
5
Typ.
±
7.8
Max.
Unit
V
±
40
0.8
2
7
120
300
±10
±60
220
30
µA
V
V
V/µs
kbits/s
Ω
mA
V
CC
= V+ = V- = 0V V
OUT
=
±
2V
One T
XOUT
to GND
1. Measured from 3 V to -3 V or from -3 V to 3 V
2. One transmitter output is loaded with R
L
= 3 kΩ to 7 kΩ, C
L
= 50 to 1000 pF
5/19
