ETC STC3232EEPE

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 0.1µF capacitors for operation from a +3.3V
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/µs Max Slew Rate
BiCMOS Technology
Ordering Information
PART
TEMP. RANGE
PIN-PACKAGE
STC3232EESE
-40°C to +85°C
16 Narrow SO
STC3232EEPE
-40°C to +85°C
16 Plastic DIP
STC3232E Datasheet Rev.0.1, Dec.2005
Page １ of
7
STC International Limited
http://www.mcu-memory.com
Pin Configurations
Ｃ１＋ １
１６ Ｖｃｃ
Ｖ＋ ２
１５ ＧＮＤ
Ｃ１－ ３
１４ Ｔ１ＯＵＴ
Ｃ２＋ ４
ＳＴＣ３２３２Ｅ
１３ Ｒ１ＩＮ
Ｃ２－ ５
１２ Ｒ１ＯＵＴ
Ｖ－ ６
１１ Ｔ１ＩＮ
Ｔ２ＯＵＴ ７
１０ Ｔ２ＩＮ
Ｒ２ＩＮ ８
９
Ｒ２ＯＵＴ
ＤＩＰ／ＳＯ
Absolute Maximum Ratings
VCC… … … … … … … … … … … … … … … … … … … … … … -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
Short-Circuit Duration, T_OUT… … … … … … … … … … … … Continuous
Continuous Power Dissipation (TA = +70°C)
16-Pin Plastic DIP (derate 10.53mW/°C above +70°C) … … … … 842mW
16-Pin Narrow SO (derate 8.70mW/°C above +70°C) … … … … 696mW
Operating Temperature Ranges
STC3232E… … … … … … … … … … … … … … … … -40°C to +85°C
Storage Temperature Range… … … … … … … … … -65°C to +165°C
Lead Temperature (soldering, 10sec) … … … … … … … … … +300°C
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.
STC3232E Datasheet Rev.0.1, Dec.2005
Page ２ of
7
STC International Limited
http://www.mcu-memory.com
Electrical Characteristics
(VCC = +3V to +5.5V, C1-C4 = 0.1µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
DC CHARACTERISTICS (VCC = +3.3V OR +5.5V, TA = +25°C )
VCC Supply Current
Shutdown Supply Current
ICC
/SHDN = VCC , No Load, TA = +25°C
0.3
1
mA
ISHDN
/SHDN = GND, No Load, TA = +25°C
1
10
µA
T_IN, /SHDN, /EN
±1
µA
0.8
V
LOGIC
Input Leakage Current
Input Threshold Low
VIL
T_IN, /SHDN, /EN
Input Threshold High
VIH
T_IN, /SHDN, /EN
Output Voltage Low
VOH
R_OUT; IOUT = 3.2mA
Output Voltage High
VOL
R_OUT; IOUT = -1.0mA
2.0
V
0.4
VCC-0.6
V
VCC-0.1
V
EIA/TIA-232E RECEIVER INPUTS
Input Voltage Range
-25
Input Threshold Low
TA = +25°C, VCC = 3.3V
Input Threshold High
TA = +25°C, VCC = 3.3V
0.6
25
V
1.1
1.5
0.1
V
2. 4
V
0.2
V
7
kO
Input Hysteresis
VCC = 3.3V
Input Resistance
TA = +25°C, VCC = 3.3V
3
5
All drivers loaded with 3kO to ground
±5
±5.4
V
300
500
O
EIA/TIA-232E TRANSMITTER OUTPUTS
Output Voltage Swing
Output Resistance
Output Short Circuit Current
±60
mA
TIMING CHARACTERISTICS
Maximum Data Rate
RL = 3 kO to 7 kO, CL = 50pF to 1000pF,
250
kbps
one transmitter switching
Receiver Propagation Delay
tPLHR, tPHLR
CL= 150pF
0.15
µs
Transmitter Propagation Delay
tPLHT, tPHLT
RL = 3 kO, CL = 2500pF,
0.1
µs
all transmitters loaded
Transition-Region Slew rate
TA = +25°C, VCC = 3.3V RL = 3 kO to 7 kO,
3
6
30
V/µs
CL = 50pF to 1000pF,
measured from -3V to +3V or +3V to -3V,
ESD & LATCH UP PERFORMANCE
ESD Protection Voltage
Latch up Performance
STC3232E Datasheet Rev.0.1, Dec.2005
Human Body Model
±15
kV
IEC1000-4-2, Contact Discharge
±8
kV
IEC1000-4-2, Air-Gap Discharge
±15
kV
±200
mA
Page ３ of
7
STC International Limited
http://www.mcu-memory.com
Pin Descriptions
PIN
NAME
FUNCTION
(SO/DIP/SSOP)
—
/EN
Receiver Enable. Active low.
1
C1+
Positive Terminal of Voltage-Doubler Charge-Pump Capacitor
2
V+
+5.5V Generated by the Charge Pump
3
C1-
Negative Terminal of Voltage-Doubler Charge-Pump Capacitor
4
C2+
Positive Terminal of Inverting Charge-Pump Capacitor
5
C2-
Negative Terminal of Inverting Charge-Pump Capacitor
6
V-
-5.5V Generated by the Charge Pump
7, 14
T_OUT
8, 13
R_IN
9, 12
R_OUT
TTL/CMOS Receiver Outputs
10, 11
T_IN
TTL/CMOS Transmitter Inputs
15
GND
Ground
16
VCC
+3.0V to +5.5V Supply Voltage
RS-232 Transmitter Outputs
RS-232 Receiver Inputs
Typical Operating Characteristics
(VCC = +3V to +5.5V, C1-C4 = 0.1µF, TA = TMIN to TMAX, unless otherwise noted. Typical values are at TA = +25°C.)
ＯＰＥＲＡＴＩＯＮ　ＳＵＰＰＬＹ　ＣＵＲＲＥＮＴ
ＶＳ．ＬＯＡＤ　ＣＡＰＡＣＩＴＡＮＣＥ
ＳＬＥＷ　ＲＡＴＥ　ＶＳ．ＬＯＡＤ　ＣＡＰＡＣＩＴＡＮＣＥ
１６
６
５
４
３
２
１
０
－１
－２
－３
－４
－５
－６
ＳＵＰＰＬＹ　ＣＬＲＲＥＮＴ　（ｍＡ）
１４
ＳＬＥＷ　ＲＡＴＥ（Ｖ／ｕＳ）
ＴＲＡＮＳＭＩＴＴＥＲ　ＯＵＴＰＵＴ　ＶＯＬＴＡＧＥ（Ｖ）
ＴＲＡＮＳＭＩＴＴＥＲ　ＯＵＴＰＵＴ　ＶＯＬＴＡＧＥ
ＶＳ．ＬＯＡＤ　ＣＡＰＡＣＩＴＡＮＣＥ
１２
１０
８
６
４
２
０
０
１０００
２０００
３０００
４０００
５０００
ＬＯＡＤ　ＣＡＰＡＣＩＴＡＮＣＥ（ｐＦ）
STC3232E Datasheet Rev.0.1, Dec.2005
０
１０００
２０００
３０００
４０００
ＬＯＡＤ　ＣＡＰＡＣＩＴＡＮＣＥ（ｐＦ）
５０００
４５
４０
３５
３０
２５
２０
１５
１０
５
０
０
１０００
２０００
３０００
４０００
５０００
ＬＯＡＤ　ＣＡＰＡＣＩＴＡＮＣＥ（ｐＦ）
Page ４ of
7
STC International Limited
http://www.mcu-memory.com
Typical Operating Circuits
＋３．３Ｖ
ＯＢＹＰＡＳＳ
１
１６
Ｖｃｃ
Ｃ１＋
Ｖ＋
２
Ｃ１
３ Ｃ１－
４
Ｃ２＋
Ｃ２
５ Ｃ２－
Ｖ－
１１
Ｔ１ＩＮ
Ｔ１ＯＵＴ
１４
１０
Ｔ２ＩＮ
Ｔ２ＯＵＴ
７
１２
Ｒ１ＯＵＴ
Ｒ１ＩＮ
１３
９
Ｒ２ＯＵＴ
Ｒ２ＩＮ
８
Ｃ３
ＳＴＣ３２３２Ｅ
６
Ｃ４
ＧＮＤ
１５
Detailed Description
Dual Charge-Pump Voltage Converter
The STC3232E’s internal power supply consists of a regulated dual charge pump that provides output voltages of +5.5V
(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 ±5V EIA/TIA-232 compliant
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
Page ５ of
7
STC International Limited
http://www.mcu-memory.com
Applications Information
Capacitor Selection
The capacitor type used for C1–C4 is not critical for proper operation; polarized or non-polarized capacitors can be used.
The charge pump requires 0.1µF capacitors for 3.3V operation. Increasing the capacitor values (e.g., by a factor of 2)
reduces ripple on the transmitter outputs and slightly reduces power consumption. C2, C3, and C4 can be increased
without changing C1’s value. When using the minimum required capacitor values, make sure the capacitor value does
not degrade excessively with temperature. If in doubt, use capacitors with a larger nominal value. The capacitor’s
equivalent series resistance (ESR), which usually rises at low temperatures, influences the amount of ripple on V+ and
V- output voltages.
Power-Supply Decoupling
n most circumstances, a 0.1µF VCC bypass capacitor is adequate. In applications sensitive to power-supply noise, use a
capacitor of the same value as charge pump capacitor C1. Connect bypass capacitors as close to the IC as possible.
Operation Down to 2.7V
Transmitter outputs meet EIA/TIA-562 levels of ±3.7V with supply voltages as low as 2.7V.
Interconnection with 3V and 5V Logic
The STC3232E can directly interface with various 3V and 5V logic families, including ACT and HCT CMOS.
Pin Configurations and Typical Operating Circuits
Ｖｃｃ
ＴＯＰ　ＶＩＥＷ
Ｃ５
Ｃ１＋ １
１６ Ｖｃｃ
Ｖ＋ ２
１５ ＧＮＤ
Ｃ１－ ３
１４ Ｔ１ＯＵＴ
Ｃ２＋ ４
ＳＴＣ３２３２Ｅ
Ｃ２－ ５
１２ Ｒ１ＯＵＴ
１１ Ｔ１ＩＮ
Ｔ２ＯＵＴ ７
１０ Ｖ２ＩＮ
Ｒ２ＩＮ ８
+
１６
Ｖｃｃ
１ Ｃ１＋
２
Ｖ＋
３ Ｃ１－ ＳＴＣ３２３２Ｅ
４
Ｃ２＋
６
+
Ｖ－
Ｃ２ ５
Ｃ１
+
Ｃ２－
１３ Ｒ１ＩＮ
Ｖ－ ６
Ｃ３
+
ＴＴＬ／ＣＭＯＳ
ＩＮＰＵＴＳ
９ Ｒ２ＯＵＴ
ＤＩＰ／ＳＯ
Ｔ１ＯＵＴ １４
＋５Ｖ
２００ＫΩ
１０ Ｔ２ＩＮ
ＲＳ－２３２
ＯＵＴＰＵＴＳ
Ｔ２ＯＵＴ ７
１２ Ｒ１ＯＵＴ
ＴＴＬ／ＣＭＯＳ
ＯＵＴＰＵＴＳ
Ｃ４
+
Ｖｃｃ
２００ＫΩ
１１ Ｔ１ＩＮ
Ｒ１ＩＮ １３
５ＫΩ
Ｒ２ＩＮ ８
９ Ｒ２ＯＵＴ
ＲＳ－２３２
ＩＮＰＵＴＳ
５ＫΩ
ＧＮＤ
１５
STC3232E Datasheet Rev.0.1, Dec.2005
Page ６ of
7
STC International Limited
http://www.mcu-memory.com
Ｐｈｙｓｉｃａｌ　Ｄｉｍｅｎｓｉｏｎｓ　Ｉｎｃｈｅｓ　（ｍｉｌｌｉｍｅｔｅｒｓ）ｕｎｌｅｓｓ　ｏｔｈｅｒｗｉｓｅ　ｎｏｔｅｄ
０．３８６－０．３９４
（９．８０４－１０．００）
１６ １５ １４ １３ １２ １１ １０
９
０．２２８－０．２４４
（５．７９１－６．１９８）
ＬＥＡＤ　ＮＯ．１
ＩＤＥＮＴ
３０°
ＴＹＰ
１
２
３
４
５
６
７
８
０．０１０
ＭＡＸ
０．２５４
０．１５０－０．１５７
（３．８１０－３．９８８）
０．０１０－０．０２０
（０．２５４－０．５０８）
０．０５３－０．０６９
×４５°
（１．３４５－１．７５３）
８°ＭＡＸ　ＴＹＰ
０．００４－０．０１０
ＡＬＬ　ＬＥＡＤＳ
（０．１０２－０．２５４）
ＳＥＮＴＩＮＧ
ＰＬＡＮＥ
０．００８－０．０１０
０．０１４
０．０１６－０．０５０
（０．２０３－０．２５４）
（０．３５６）
（０．４０６－１．２７０）
ＴＹＰ　ＡＬＬ　ＬＥＡＤＳ
０．０５０
０．０１４－０．０２０ ＴＹＰ
（１．２７０）
ＴＹＰ
ＴＹＰ　ＡＬＬ　ＬＥＡＤＳ
（０．３５６－０．５０８）
０．００８
（０．２０３）
０．７４０－０．７８０
０．０９０
（１８．８０－１９．８１）
（２．２８６）
１６
１５
１４
１３
１２
ＴＹＰ
１１
１０
９
ＩＮＤＥＸ
ＡＲＥＡ
１６
１５
１４
１３
１２
１１
１０
９
１
２
３
４
５
６
７
８
０．２５０±０．０１０
（６．３５０±０．２５４）
ＰＩＮ　ＮＯ．１
ＩＤＥＮＴ
１
２
３
４
５
６
７
ＰＩＮ　ＮＯ．１
ＩＤＥＮＴ
８
ＯＰＴＩＯＮ　０１
０．１３０±０．００５
（３．３０２±０．１２７）
０．０６０
（１．５２４）
ＴＹＰ
ＯＰＴＩＯＮ　０２
０．０６５
４°ＴＹＰ
０．３００－０．３２０
（１．６５１）
ＯＰＴＩＯＮＡＬ
（７．６２０－８．１２８）
０．１４５－０．２００
（３．６８３－５．０８０）
９０°±４°ＴＹＰ
０．０２０ ＭＩＮ
（０．５０８）
０．１２５－０．１５０
０．０３０±０．０１５
（３．１７５－３．８１０）
（０．７６２±０．３８１）
０．１００±０．０１０
０．０１４－０．０２３
（０．３５６－０．５８４）
ＴＹＰ
STC3232E Datasheet Rev.0.1, Dec.2005
０．０５０±０．０１０
（１．２７０±０．２５４）
ＴＹＰ
（２．５４０±０．２５４）
ＴＹＰ
９５°±　５°
０．２８０
０．００８－０．０１６
（０．２０３－０．４０６）
ＴＹＰ
（７．１１２）
ＭＩＮ
０．３２５ ＋０．０４０
－０．０１５
８．２５５ ＋１．０１６
－０．３８１
Ｎ１ＲＥ（ＲＥＶ　Ｆ）
Page ７ of
7