February 2008 Rev 14 1/19
19
ST232B
ST232C
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
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.
SOP Large
DIP
TSSOP
SOP
Table 1. Device summary
Order code Temperature
range Package Packaging
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
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
www.st.com
ST232B - ST232C
2/19
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
ST232B - ST232C Pin configuration
3/19
1 Pin configuration
Figure 1. Pin connections (top view)
Table 2. Pin description
Pin n° Symbol Note
1C
1+ Positive terminal for the first charge pump capacitor
2 V+ Doubled voltage terminal
3C
1- Negative terminal for the first charge pump capacitor
4C
2+ Positive terminal for the second charge pump capacitor
5C
2- Negative terminal for the second charge pump capacitor
6 V- Inverted voltage terminal
7T2
OUT Second transmitter output voltage
8R2
IN Second receiver input voltage
9R2
OUT Second receiver output voltage
10 T2IN Second transmitter input voltage
11 T1IN First transmitter input voltage
12 R1OUT First receiver output voltage
13 R1IN First receiver input voltage
14 T1OUT First transmitter output voltage
15 GND Ground
16 VCC Supply voltage
Maximum ratings ST232B - ST232C
4/19
2 Maximum ratings
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.
Table 3. Absolute maximum ratings
Symbol Parameter Value Unit
VCC Supply voltage -0.3 to 6 V
TIN Transmitter input voltage range -0.3 to (VCC + 0.3) V
RIN Receiver input voltage range ± 30 V
TOUT Transmitter output voltage range (V+ + 0.3) to (V- - 0.3) V
ROUT Receiver output voltage range -0.3 to (VCC + 0.3) V
TSCTOUT Short circuit duration on TOUT infinite
TSTG Storage temperature range -65 to + 150
ST232B - ST232C Electrical characteristics
5/19
3 Electrical characteristics
Table 4. Electrical characteristics
(C1 - C4 = 0.1 µF, VCC = 5 V ± 10 %, TA = -40 to 85 °C, unless otherwise specified. Typical
values are referred to TA = 25 °C).
Symbol Parameter Test condition Min. Typ. Max. Unit
ISUPPLY VCC Power supply current No Load, TA = 25°C 5 10 mA
Table 5. Transmitter electrical characteristics
(C1 - C4 = 0.1 µF, VCC = 5 V ± 10 %, TA = -40 to 85 °C, unless otherwise specified. Typical
values are referred to TA = 25 °C).
Symbol Parameter Test condition Min. Typ. Max. Unit
VTOUT Output voltage swing All transmitter outputs are loaded
with 3kΩ to GND ± 5± 7.8 V
ITIL Input leakage current ± 40 µA
VTIL Input logic threshold low 0.8 V
VTIH Input logic threshold high 2 V
SRTTransition slew rate TA = 25°C, VCC = 5V
RL = 3 to 7kΩ, CL = 50 to 2500pF (1) 730V/µs
DRData rate (2) 120 220 kbits/s
RTOUT Transmitter output resistance VCC = V+ = V- = 0V VOUT = ± 2V 300 Ω
ISC
Transmitter output short circuit
current One TXOUT to GND ±10 ±60 mA
1. Measured from 3 V to -3 V or from -3 V to 3 V
2. One transmitter output is loaded with RL = 3 kΩ to 7 kΩ, CL = 50 to 1000 pF
Electrical characteristics ST232B - ST232C
6/19
Table 6. Receiver electrical characteristics
(C1 - C4 = 0.1 µF, VCC = 5 V ± 10 %, TA = -40 to 85 °C, unless otherwise specified. Typical
values are referred to TA = 25 °C).
Symbol Parameter Test condition Min. Typ. Max. Unit
VRIN
Receiver input voltage
operating range -30 30 V
RRIN RS-232 input resistance TA = 25°C, VCC = 5 V,
VRIN = 5V 357kΩ
VRIL RS-232 input threshold low TA = 25°C, VCC = 5 V 0.8 1.2 V
VRIH RS-232 input threshold high TA = 25°C, VCC = 5 V 1.7 2.4 V
VRIHYS RS-232 input hysteresis VCC = 5V 0.2 0.5 1 V
VROL TTL/CMOS output voltage low IOUT = 3.2mA (to VCC)0.4V
VROH TTL/CMOS output voltage high IOUT = -1mA (to GND) 3.5 VCC-0.4 V
ISCR
Receiver output short circuit
current ±10 mA
tDR Receiver propagation delay CL = 150pF (1) 0.3 1 µs
1. RS-232 in to TTL-CMOS out (from 50% to 50%)
ST232B - ST232C Typical application
7/19
4 Typical application
Figure 2. Application circuit (1) (2)
1. C1-4 capacitors can even be 1µF ones
2. C1-4 can be common or biased capacitors
Table 7. Capacitance value (µF)
C1 C2 C3 C4 C5
0.1 0.1 0.1 0.1 0.1
Typical performance characteristics ST232B - ST232C
8/19
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
temperature
Figure 8. Low level output voltage swing vs
temperature
ST232B - ST232C Typical performance characteristics
9/19
Figure 9. High level transmitter output short
circuit current vs temperature
Figure 10. Low level transmitter output short
circuit current vs temperature
Figure 11. High level receiver output short
circuit current vs temperature
Figure 12. Low level receiver output short
circuit current vs temperature
Package mechanical data ST232B - ST232C
10/19
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.
ST232B - ST232C Package mechanical data
11/19
Dim.
mm. inch.
Min. Typ. Max. Min. Typ. Max.
a1 0.51 0.020
B 0.77 1.65 0.030 0.065
b0.5 0.020
b1 0.25 0.010
D200.787
E8.5 0.335
e 2.54 0.100
e317.780.700
F 7.1 0.280
I 5.1 0.201
L3.30.130
Z 1.27 0.050
Plastic DIP-16 (0.25) mechanical data
P001C
Package mechanical data ST232B - ST232C
12/19
Dim. mm. inch.
Min. Typ. Max. Min. Typ. Max.
A 1.75 0.068
a1 0.1 0.25 0.004 0.010
a2 1.64 0.063
b0.35 0.46 0.0130.018
b1 0.190.25 0.007 0.010
C 0.5 0.019
c1 45° (typ.)
D9.810 0.385 0.393
E5.86.2 0.2280.244
e 1.27 0.050
e38.89 0.350
F3.84.0 0.1490.157
G 4.6 5.30.181 0.208
L 0.5 1.27 0.0190.050
M 0.62 0.024
S8° (max.)
SO-16 mechanical data
0016020D
ST232B - ST232C Package mechanical data
13/19
Dim. mm. inch.
Min. Typ. Max. Min. Typ. Max.
A 2.65 0.104
a1 0.1 0.2 0.004 0.008
a2 2.45 0.096
b0.350.490.014 0.019
b1 0.230.32 0.0090.012
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.)
SO-16L mechanical data
PO13I
Package mechanical data ST232B - ST232C
14/19
Dim.
mm. inch.
Min. Typ. Max. Min. Typ. Max.
A 1.2 0.047
A1 0.05 0.15 0.002 0.004 0.006
A2 0.81 1.05 0.031 0.039 0.041
b0.190.30 0.007 0.012
c0.090.20 0.004 0.0079
D4.95 5.1 0.193 0.197 0.201
E 6.2 6.4 6.6 0.244 0.252 0.260
E1 4.34.4 4.480.1690.1730.176
e 0.65 BSC 0.0256 BSC
K0° 8°0° 8°
L 0.45 0.60 0.75 0.0180.024 0.030
TSSOP16 mechanical data
cE
b
A2
A
E1
D
1
PIN 1 IDENTIFICATION
A1 L
K
e
0080338D
ST232B - ST232C Package mechanical data
15/19
Dim.
mm. inch.
Min. Typ. Max. Min. Typ. Max.
A330 12.992
C 12.813.2 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 10.310.5 0.406 0.414
Ko 2.1 2.30.082 0.090
Po 3.94.1 0.1530.161
P7.98.1 0.311 0.319
Tape & reel SO-16 mechanical data
Package mechanical data ST232B - ST232C
16/19
Dim.
mm. inch.
Min. Typ. Max. Min. Typ. Max.
A330 12.992
C 12.813.2 0.504 0.519
D 20.2 0.795
N60 2.362
T 22.4 0.882
Ao 10.811.0 0.425 0.433
Bo 10.7 10.90.421 0.429
Ko 2.93.1 0.114 0.122
Po 3.94.1 0.1530.161
P 11.912.1 0.4680.476
Tape & reel SO-16L mechanical data
ST232B - ST232C Package mechanical data
17/19
Dim.
mm. inch.
Min. Typ. Max. Min. Typ. Max.
A330 12.992
C 12.813.2 0.504 0.519
D 20.2 0.795
N60 2.362
T 22.4 0.882
Ao 6.7 6.90.264 0.272
Bo 5.35.5 0.2090.217
Ko 1.6 1.80.0630.071
Po 3.94.1 0.1530.161
P7.98.1 0.311 0.319
Tape & reel TSSOP16 mechanical data
ST232B - ST232C
19/19
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