ST3232B, ST3232C
3 to 5.5 V, low-power, up to 400 kbs RS-232 drivers and
receivers
Datasheet - production data
The ST3232B and ST3232C have two receivers
and two drivers.
The devices are guaranteed to run at data rates
of 250 kbps while maintaining RS-232 output
levels. Typical applications are notebooks,
subnotebooks and palmtop computers, battery-
powered equipment, hand-held equipment,
peripherals, and printers.
Table 1: Device summary
Order code
ST3232CDR
ST3232BDR
Temp. range
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
SO16
(tape and
reel)
SO16L
(tape and
reel)
TSSOP16
(tape and
reel)
Packaging
2500 parts
per reel
1000 parts
per reel
2500 parts
per reel
Features
300 µA supply current
300 kbps minimum guaranteed data rate
6 V/µs minimum guaranteed slew rate
Meets EIA/TIA-232 specifications down
to 3 V
Available in SO16, SO16L, and TSSOP16
packages
ST3232CWR
ST3232BWR
ST3232CTR
ST3232BTR
Description
The ST3232B and ST3232C devices are 3 V
powered EIA/TIA-232 and V.28/V.24
communication interfaces with low power
requirements and high data-rate capabilities.
These devices have a proprietary low dropout
transmitter output stage providing true RS-232
performance from 3 to 5.5 V supplies. The
devices require only four small 0.1 mF standard
external capacitors for operation from a 3 V
supply.
January 2016
DocID7454 Rev 12
1/18
www.st.com
This is information on a product in full production.
Contents
ST3232B, ST3232C
Contents
1
2
3
4
5
6
Pin configuration ............................................................................. 3
Absolute maximum ratings............................................................. 4
Electrical characteristics ................................................................ 5
Application information .................................................................. 7
Typical performance characteristics ............................................. 8
Package information ..................................................................... 10
6.1
6.2
6.3
6.4
6.5
6.6
SO16 package information .............................................................. 11
SO16L package information ............................................................ 12
TSSOP16 package information ....................................................... 13
SO16 tape and reel package information ........................................ 14
SO16L tape and reel package information ...................................... 15
TSSOP16 tape and reel package information ................................. 16
7
Revision history ............................................................................ 17
2/18
DocID7454 Rev 12
ST3232B, ST3232C
Pin configuration
1
Pin configuration
Figure 1: Pin connections
Table 2: Pin description
Pin n°
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
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
Name and function
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
DocID7454 Rev 12
3/18
Absolute maximum
ratings
ST3232B, ST3232C
2
Absolute maximum ratings
Table 3: Absolute maximum ratings
Symbol
V
CC
V+
V-
V+ + |V-|
T
IN
R
IN
T
OUT
R
OUT
t
SHORT
T
stg
Transmitter input voltage range
Receiver input voltage range
Transmitter output voltage range
Receiver output voltage range
Transmitter output short to gnd time
Storage temperature
Supply voltage
Doubled voltage terminal
Inverted voltage terminal
Parameter
Value
-0.3 to 6
(V
CC
- 0.3) to 7
0.3 to -7
13
-0.3 to 6
±25
±13.2
-0.3 to (V
CC
+ 0.3)
Continuous
-65 to 150
°C
V
Unit
Absolute maximum ratings are those values beyond which damage to the device
may occur. Functional operation under these condition is not implied.
Externally applied V+ and V- can have a maximum magnitude of +7 V, but their
absolute addition can not exceed 13 V.
Running on internal charge pump, intrinsic self limitation allows exceeding those
values without any damage.
Startup voltage sequence (V
CC
, then V+, then V-) is critical, therefore it is not
recommended to use this device using externally applied voltage to V+ and V-.
4/18
DocID7454 Rev 12
ST3232B, ST3232C
Electrical characteristics
3
Symbol
I
SUPPLY
Electrical characteristics
Table 4: Electrical characteristics (C1 - C4 = 0.1 µF, VCC = 3 V to 5.5 V, TA = -40 to 85 °C,
unless otherwise specified. Typical values are referred to TA = 25 °C)
Parameter
V
CC
power supply current
Test conditions
No load, V
CC
= 3 V ± 10 %, T
A
= 25 °C
No load, V
CC
= 5 V ± 10 %, T
A
= 25 °C
Min.
Typ.
0.3
1
Max.
1
2
Unit
mA
Table 5: Logic input (C1 - C4 = 0.1 µF, VCC = 3 V to 5.5 V, TA = -40 to 85 °C, unless otherwise
specified. Typical values are referred to TA = 25 °C)
Symbol
V
TIL
V
TIH
I
IL
Notes:
(1)
Parameter
Input logic threshold low
Input logic threshold high
Input leakage current
Test conditions
T-IN
(1)
Min.
Typ.
Max.
0.8
Unit
V
CC
= 3.3 V
V
CC
= 5 V
T-IN
2
2.4
±0.01
±1
V
µA
Transmitter input hysteresis is typically 250 mV.
Table 6: Transmitter (C1 - C4 = 0.1 µF tested at 3.3 V ±10 %, VCC = 3 V to 5.5 V,
TA = -40 to 85 °C, unless otherwise specified. Typical values are referred to TA = 25 °C)
Symbol
V
TOUT
R
TOUT
I
TSC
Parameter
Output voltage swing
Transmitter output
resistance
Output short circuit current
Test conditions
All transmitter outputs are loaded with 3 kΩ
to GND
V
CC
= V+ = V- = 0 V, V
OUT
= ±2 V
V
CC
= 3 V or 5 V, V
OUT
= ±12
Min.
±5
300
Typ.
±5.4
10
M
± 60
Max.
Unit
V
Ω
mA
Table 7: Receiver (C1 - C4 = 0.1 µF tested at 3.3 V ±10 %, VCC = 3 V to 5.5 V, TA = -40 to 85 °C,
unless otherwise specified. Typical values are referred to TA = 25 °C)
Symbol
V
RIN
V
RIL
V
RIH
V
RIHYS
R
RIN
V
ROL
V
ROH
Parameter
Receiver input voltage operating range
RS-232 Input threshold low
T
A
= 25 °C, V
CC
= 3.3 V
T
A
= 25 °C, V
CC
= 5 V
T
A
= 25 °C, V
CC
= 3.3 V
T
A
= 25 °C, V
CC
= 5 V
T
A
= 25 °C
I
OUT
= 1.6 mA
I
OUT
= -1 mA
V
CC
- 0.6
V
CC
- 0.1
3
Test conditions
Min.
-25
0.6
0.8
1.1
1.5
1.5
1.8
0.3
5
7
0.4
kΩ
V
2.4
2.4
V
Typ.
Max.
25
Unit
RS-232 Input threshold high
Input hysteresis
Input resistance
TTL/CMOS output voltage low
TTL/CMOS output voltage high
DocID7454 Rev 12
5/18
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