STC International Limited
http://www.mcu-memory.com
STC3232E
High ESD-Protected, Low Power,
3.3V to 5.5V, True RS-232 Transceivers
General Description
The STC3232E is 2 driver, 2 receiver RS-232 transceiver solutions intended for portable or hand-held applications,
features low power consumption, high data-rate capabilities, and enhanced ESD protection. The ESD tolerance of the
STC3232E devices is over ±
15kV for both human body model and IEC1000-4-2 air discharge test methods.
A low-dropout transmitter output stage delivers true RS-232 performance from a +3.0V to +5.5V power supply, using
an internal dual charge pump. The charge pump requires only four small 0.1µ capacitors for operation from a +3.3V
F
supply. Each device guarantees operation at data rates of 250kbps while maintaining RS-232 output levels.
The STC3232E is pin, package, and functionally compatible with the industry-standard MAX232.
Applications
Notebook, Sub notebook, and Palmtop Computers
Battery-Powered / Hand-Held Equipment
POS terminal
/
Intelligent Network Switch
DMM / Printers
Smart Phones
xDSL Modems
Features
Interoperable with EIA/TIA - 232 and adheres to EIA/TIA - 562
Enhanced ESD Specifications:
15kV Human Body Model
15kV IEC1000-4-2 Air Discharge
8kV IEC1000-4-2 Contact Discharge
250 kbps Minimum Transmission Rate
Ideal for Handheld, Battery Operated Applications
Latch up Free
Guaranteed 30V/µ Max Slew Rate
s
BiCMOS Technology
Ordering Information
PART
STC3232EESE
STC3232EEPE
TEMP. RANGE
-40° to +85°
C
C
-40° to +85°
C
C
PIN-PACKAGE
16 Narrow SO
16 Plastic DIP
STC3232E Datasheet Rev.0.1, Dec.2005
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STC International Limited
http://www.mcu-memory.com
Pin Configurations
Ｃ１＋ １
Ｖ＋ ２
Ｃ１－ ３
Ｃ２＋ ４
Ｃ２－ ５
Ｖ－ ６
Ｔ２
ＯＵＴ
７
Ｒ２
ＩＮ
８
１６ Ｖ½½
１５ ＧＮＤ
１４ Ｔ１
ＯＵＴ
ＳＴＣ３２３２Ｅ
１３ Ｒ１
ＩＮ
１２ Ｒ１
ＯＵＴ
１１ Ｔ１
ＩＮ
１０ Ｔ２
ＩＮ
９
Ｒ２
ＯＵＴ
ＤＩＰ／ＳＯ
Absolute Maximum Ratings
V
CC
… … … … … … … … … … … … … … … … … … … … … … -0.3V to +6V
V
+
… … … … … … … … … … … … … … … … … … … … … … - 0.3V to +7V
V
-
… … … … … … … … … … … … … … … … … … … … … … … +0.3V to-7V
Input Voltages
T_IN… … … … … … … … … … … … … … … … … … … … -0.3V to +6V
R_IN… … … … … … … … … … … … … … … … … … … … … … … ±
25V
Output Voltages
T_OUT… … … … … … … … … … … … … … … … … … … … … ±
13.2V
R_OUT… … … … … … … … … … … … … … … -0.3V to (VCC + 0.3V)
Stresses beyond those listed under “
Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and
functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not
implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Short-Circuit Duration, T_OUT… … … … … … … … … … … … Continuous
Continuous Power Dissipation (TA = +70°
C)
16-Pin Plastic DIP (derate 10.53mW/° above +70° … … … … 842mW
C
C)
16-Pin Narrow SO (derate 8.70mW/° above +70° … … … … 696mW
C
C)
Operating Temperature Ranges
STC3232E… … … … … … … … … … … … … … … … -40° to +85°
C
C
Storage Temperature Range… … … … … … … … … -65° to +165°
C
C
Lead Temperature (soldering, 10sec) … … … … … … … … … +300°
C
STC3232E Datasheet Rev.0.1, Dec.2005
Page
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STC International Limited
http://www.mcu-memory.com
Electrical Characteristics
(V
CC
= +3V to +5.5V, C1-C4 = 0.1µ T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°
F,
C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DC CHARACTERISTICS (V
CC
= +3.3V OR +5.5V, T
A
= +25° )
C
V
CC
Supply Current
Shutdown Supply Current
LOGIC
Input Leakage Current
Input Threshold Low
Input Threshold High
Output Voltage Low
Output Voltage High
EIA/TIA-232E RECEIVER INPUTS
Input Voltage Range
Input Threshold Low
Input Threshold High
Input Hysteresis
Input Resistance
EIA/TIA-232E TRANSMITTER OUTPUTS
Output Voltage Swing
Output Resistance
Output Short Circuit Current
TIMING CHARACTERISTICS
Maximum Data Rate
RL = 3 kO to 7 kO, CL = 50pF to 1000pF,
one transmitter switching
Receiver Propagation Delay
Transmitter Propagation Delay
t
PLHR
, t
PHLR
t
PLHT
, t
PHLT
CL= 150pF
RL = 3 kO, CL = 2500pF,
all transmitters loaded
Transition-Region Slew rate
T
A
= +25° V
CC
= 3.3V RL = 3 kO to 7 kO,
C,
CL = 50pF to 1000pF,
measured from -3V to +3V or +3V to -3V,
ESD & LATCH UP PERFORMANCE
ESD Protection Voltage
Human Body Model
IEC1000-4-2, Contact Discharge
IEC1000-4-2, Air-Gap Discharge
Latch up Performance
±
15
±
8
±
15
±
200
kV
kV
kV
mA
3
6
30
V/µs
0.15
0.1
µs
µs
250
kbps
All drivers loaded with 3kO to ground
±
5
300
±
5.4
500
±
60
V
O
mA
T
A
= +25° V
CC
= 3.3V
C,
T
A
= +25° V
CC
= 3.3V
C,
V
CC
= 3.3V
T
A
= +25° V
CC
= 3.3V
C,
0.1
3
5
-25
0.6
1.1
1.5
2. 4
0.2
7
25
V
V
V
V
kO
VIL
VIH
VOH
VOL
T_IN, /SHDN, /EN
T_IN, /SHDN, /EN
T_IN, /SHDN, /EN
R_OUT; IOUT = 3.2mA
R_OUT; IOUT = -1.0mA
VCC-0.6
VCC-0.1
2.0
0.4
±
1
0.8
µA
V
V
V
V
I
CC
I
SHDN
/SHDN = V
CC
, No Load, T
A
= +25°
C
/SHDN = GND, No Load, T
A
= +25°
C
0.3
1
1
10
mA
µA
STC3232E Datasheet Rev.0.1, Dec.2005
Page
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STC International Limited
http://www.mcu-memory.com
Pin Descriptions
PIN
NAME
(SO/DIP/SSOP)
—
1
2
3
4
5
6
7, 14
8, 13
9, 12
10, 11
15
16
/EN
C1+
V+
C1-
C2+
C2-
V-
T_OUT
R_IN
R_OUT
T_IN
GND
VCC
Receiver Enable. Active low.
Positive Terminal of Voltage-Doubler Charge-Pump Capacitor
+5.5V Generated by the Charge Pump
Negative Terminal of Voltage-Doubler Charge-Pump Capacitor
Positive Terminal of Inverting Charge-Pump Capacitor
Negative Terminal of Inverting Charge-Pump Capacitor
-5.5V Generated by the Charge Pump
RS-232 Transmitter Outputs
RS-232 Receiver Inputs
TTL/CMOS Receiver Outputs
TTL/CMOS Transmitter Inputs
Ground
+3.0V to +5.5V Supply Voltage
FUNCTION
Typical Operating Characteristics
(V
CC
= +3V to +5.5V, C1-C4 = 0.1µ T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°
F,
C.)
ＴＲＡＮＳＭＩＴＴＥＲ ＯＵＴＰＵＴ ＶＯＬＴＡＧＥ
ＶＳ．ＬＯＡＤ ＣＡＰＡＣＩＴＡＮＣＥ
６
５
４
３
２
１
０
－１
－２
－３
－４
－５
－６
０
１０００
２０００
３０００
４０００
５０００
ＬＯＡＤ ＣＡＰＡＣＩＴＡＮＣＥ（½Ｆ）
ＴＲＡＮＳＭＩＴＴＥＲ ＯＵＴＰＵＴ ＶＯＬＴＡＧＥ（Ｖ）
ＳＬＥＷ ＲＡＴＥ ＶＳ．ＬＯＡＤ ＣＡＰＡＣＩＴＡＮＣＥ
１６
１２
１０
８
６
４
２
０
０
１０００
２０００
３０００
４０００
５０００
ＳＵＰＰＬＹ ＣＬＲＲＥＮＴ （½Ａ）
１４
ＳＬＥＷ ＲＡＴＥ（Ｖ／½Ｓ）
４５
４０
３５
３０
２５
２０
１５
１０
５
０
０
ＯＰＥＲＡＴＩＯＮ ＳＵＰＰＬＹ ＣＵＲＲＥＮＴ
ＶＳ．ＬＯＡＤ ＣＡＰＡＣＩＴＡＮＣＥ
１０００
２０００
３０００
４０００
５０００
ＬＯＡＤ ＣＡＰＡＣＩＴＡＮＣＥ（½Ｆ）
ＬＯＡＤ ＣＡＰＡＣＩＴＡＮＣＥ（½Ｆ）
STC3232E Datasheet Rev.0.1, Dec.2005
Page
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STC International Limited
Typical Operating Circuits
＋３．３Ｖ
ＯＢＹＰＡＳＳ
１
Ｃ１
Ｃ１＋
１６
Ｖ½½
Ｖ＋
２
Ｃ３
http://www.mcu-memory.com
３ Ｃ１－
４
Ｃ２＋
５ Ｃ２－
ＳＴＣ３２３２Ｅ
Ｖ－
６
Ｃ２
Ｃ４
１１
Ｔ１ＩＮ
Ｔ１ＯＵＴ
１４
１０
Ｔ２ＩＮ
Ｔ２ＯＵＴ
７
１２
Ｒ１ＯＵＴ
Ｒ１ＩＮ
１３
９
Ｒ２ＯＵＴ
Ｒ２ＩＮ
８
ＧＮＤ
１５
Detailed Description
Dual Charge-Pump Voltage Converter
The STC3232E’ internal power supply consists of a regulated dual charge pump that provides output voltages of +5.5V
s
(doubling charge pump) and -5.5V (inverting charge pump) over the +3.0V to +5.5V VCC range. The charge pump
operates in discontinuous mode; if the output voltages are less than 5.5V, the charge pump is enabled, and if the output
voltages exceed 5.5V, the charge pump is disabled. Each charge pump requires a flying capacitor (C1, C2) and a storage
capacitor (C3, C4) to generate the V+ and V- supplies.
RS-232 Transmitters
The transmitters are inverting level translators that convert TTL/CMOS-logic levels to ± EIA/TIA-232 compliant
5V
levels. The STC3232E transmitter guarantees a 250kbps data rate with worst-case loads of 3KO parallel with 1000pF.
Transmitters can be paralleled to drive multiple receivers. The STC3232E permits the outputs to be driven up to ±
12V in
shutdown.
RS-232 Receivers
The receivers convert RS-232 signals to CMOS-logic output levels.
±
15kV ESD Protection
ESD-protection structures are incorporated to protect against electrostatic discharges encountered during handling and
assembly. The driver outputs and receiver inputs of the STC3232E have extra protection against static electricity. The
ESD structures withstand high ESD in all states: normal operation, shutdown, and powered down. After an ESD event,
Circuits keep working without latch up. ESD protection can be tested in various ways; the transmitter outputs and
receiver inputs for the STC3232E are characterized for protection to the following limits:
±
15kV using the Human Body Model
±
8kV using the Contact Discharge method specified in IEC 1000-4-2
±
15kV using the Air-Gap Discharge method specified in IEC 1000-4-2.
STC3232E Datasheet Rev.0.1, Dec.2005
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