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
ST232B - ST232C Typical application
4 Typical application
Figure 2. Application circuit
(1) (2)
1. C
capacitors can even be 1µF ones
1-4
can be common or biased capacitors
2. C
1-4
Table 7. Capacitance value (µF)
C1 C2 C3 C4 C5
0.1 0.1 0.1 0.1 0.1
7/19
Typical performance characteristics ST232B - ST232C
5 Typical performance characteristics
(Unless otherwise specified TJ = 25 °C)
Figure 3. Supply current vs temperature Figure 4. Data rate vs temperature
Figure 5. Receiver propagation delay Figure 6. Driver propagation delay
Figure 7. High level output voltage swing vs
8/19
temperature
Figure 8. Low level output voltage swing vs
temperature
ST232B - ST232C Typical performance characteristics
Figure 9. High level transmitter output short
circuit current vs temperature
Figure 11. High level receiver output short
circuit current vs temperature
Figure 10. Low level transmitter output short
circuit current vs temperature
Figure 12. Low level receiver output short
circuit current vs temperature
9/19
Package mechanical data ST232B - ST232C
6 Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK
packages. These packages have a lead-free second level interconnect. The category of
second Level Interconnect is marked on the package and on the inner box label, in
compliance with JEDEC Standard JESD97. The maximum ratings related to soldering
conditions are also marked on the inner box label. ECOPACK is an ST trademark.
ECOPACK specifications are available at: www.st.com.
®
10/19
ST232B - ST232C Package mechanical data
Plastic DIP-16 (0.25) mechanical data
mm. inch.
Dim.
Min. Typ. Max. Min. Typ. Max.
a1 0.51 0.020
B 0.77 1.65 0.030 0.065
b 0.5 0.020
b1 0.25 0.010
D200.787
E 8.5 0.335
e 2.54 0.100
e3 17.78 0.700
F 7.1 0.280
I 5.1 0.201
L 3.3 0.130
Z 1.27 0.050
P001C
11/19
Package mechanical data ST232B - ST232C
SO-16 mechanical data
Dim.
A 1.75 0.068
a1 0.1 0.25 0.004 0.010
a2 1.64 0.063
b 0.35 0.46 0.013 0.018
b1 0.19 0.25 0.007 0.010
C 0.5 0.019
c1 45° (typ.)
D 9.8 10 0.3850.393
E5.8 6.2 0.228 0.244
e 1.27 0.050
e38.89 0.350
F 3.8 4.0 0.149 0.157
G 4.6 5.3 0.181 0.208
L 0.5 1.27 0.019 0.050
M 0.62 0.024
S8° (max.)
Min. Typ. Max. Min. Typ. Max.
mm. inch.
12/19
0016020D
ST232B - ST232C Package mechanical data
SO-16L mechanical data
Dim.
A 2.65 0.104
a1 0.1 0.2 0.004 0.008
a2 2.45 0.096
b 0.350.49 0.014 0.019
b1 0.23 0.32 0.009 0.012
C 0.5 0.020
c1 45° (typ.)
D 10.1 10.5 0.397 0.413
E 10.0 10.65 0.393 0.419
e 1.27 0.050
e38.89 0.350
F 7.4 7.6 0.2910.300
G
L 0.5 1.27 0.020 0.050
M 0.75 0.029
S8° (max.)
Min. Typ. Max. Min. Typ. Max.
mm. inch.
PO13I
13/19
Package mechanical data ST232B - ST232C
TSSOP16 mechanical data
mm. inch.
Dim.
Min. Typ. Max. Min. Typ. Max.
A 1.2 0.047
A1 0.05 0.15 0.002 0.004 0.006
A2 0.8 1 1.05 0.031 0.039 0.041
b 0.19 0.30 0.007 0.012
c0.09 0.20 0.004 0.0079
D4.9 5 5.1 0.193 0.197 0.201
E 6.2 6.4 6.6 0.244 0.252 0.260
E1 4.3 4.4 4.48 0.169 0.173 0.176
e 0.65 BSC 0.0256 BSC
K0° 8°0° 8°
L 0.45 0.60 0.75 0.018 0.024 0.030
A2
A
A1
b
e
c
K
L
E
D
E1
PIN 1 IDENTIFICATION
14/19
1
0080338D
ST232B - ST232C Package mechanical data
Tape & reel SO-16 mechanical data
mm. inch.
Dim.
Min. Typ. Max. Min. Typ. Max.
A 330 12.992
C 12.8 13.2 0.504 0.519
D 20.2 0.795
N60 2.362
T 22.4 0.882
Ao 6.45 6.65 0.254 0.262
Bo 10.3 10.5 0.406 0.414
Ko 2.1 2.3 0.082 0.090
Po 3.9 4.1 0.153 0.161
P7.98.1 0.311 0.319
15/19
Package mechanical data ST232B - ST232C
Tape & reel SO-16L mechanical data
mm. inch.
Dim.
Min. Typ. Max. Min. Typ. Max.
A 330 12.992
C 12.8 13.2 0.504 0.519
D 20.2 0.795
N60 2.362
T 22.4 0.882
Ao 10.8 11.0 0.425 0.433
Bo 10.7 10.9 0.421 0.429
Ko 2.93.1 0.114 0.122
Po 3.9 4.1 0.153 0.161
P 11.9 12.1 0.468 0.476
16/19
ST232B - ST232C Package mechanical data
Tape & reel TSSOP16 mechanical data
mm. inch.
Dim.
Min. Typ. Max. Min. Typ. Max.
A 330 12.992
C 12.8 13.2 0.504 0.519
D 20.2 0.795
N60 2.362
T 22.4 0.882
Ao 6.7 6.9 0.264 0.272
Bo 5.3 5.5 0.209 0.217
Ko 1.6 1.8 0.063 0.071
Po 3.9 4.1 0.153 0.161
P7.98.1 0.311 0.319
17/19
Revision history ST232B - ST232C
7 Revision history
Table 8. Document revision history
Date Revision Changes
02-Sep-2005 11 Mistake I
27-Oct-2006 12 Order codes updated.
14-Nov-2007 13 Added Ta b le 1 .
08-Feb-2008 14 Modified: Table 1 on page 1.
max. on table 5.
TIL
18/19
ST232B - ST232C
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