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MAX202ECPEMAXIMN/a210avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX202ECSEN/a9avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX202ECWEMAXIMN/a6698avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX202ECWEMAXN/a410avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX202ECWEMAXIM ?N/a500avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX202EEPEMAXN/a30avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX202EESEMAXIM ?N/a200avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX202EESEN/a733avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX202EESEMAXN/a3000avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX202EESEMAXIMN/a1800avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX202EEWEMAXIMN/a480avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX202EEWEMAXIM ?N/a1200avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX202EEWEMAXN/a171avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX203ECPPMAXN/a1052avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX203ECWPMAXIMN/a22avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX203ECWPMAXN/a216avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX203ECWPMAXIM ?N/a50avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX203ECWP+ |MAX203ECWPMAXIMN/a1028avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX203EEPPMAXIM N/a150avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX203EEPPMAX N/a10avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX203EEPP+ |MAX203EEPPMAXIMN/a1000avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX203EEPP+ |MAX203EEPPSPN/a396avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX203EEPP+ |MAX203EEPPMAXN/a1190avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX203EEWPN/a542avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX203EEWPMAXN/a41avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX203EEWP+ |MAX203EEWPMAXIMN/a1000avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX205ECPGN/a5avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX206ECAGMAXIMN/a16avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX206ECNGMAXIMN/a6avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX206ECWGMAXIMN/a176avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX206EEWGMAXIMN/a2186avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX207ECAGMAXIMN/a17avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX207ECAGMAXN/a167avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX207ECWGMAXIMN/a28avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX207ECWGMAXN/a13avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX207EEAGMAXIMN/a18avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX208ECAGMAXIMN/a286avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX208ECWGMaxim N/a103avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX208ECWGMAXN/a100avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX208EEAGMAXIMN/a5000avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX208EEAGMAXN/a370avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX208EEWGMAXIMN/a30avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX211ECAIN/a325avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX211ECWIMAXN/a383avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX211EEAIMAXIM ?N/a90avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX211EEAIMAXIMN/a103avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX211EEAIMAXN/a25avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX211EEWIMAXIMN/a154avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX213ECAIMAXN/a850avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX213ECWIMAXIMN/a64avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX213ECWIPb-freeN/a185avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX213ECWIMAXN/a160avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX213EEAIMAXIM ?N/a100avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX213EEAIMAXIMN/a46avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX213EEWIMAXN/a113avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX232ECPEMAXIN/a200avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX232ECSEMAXIN/a50avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX232ECWEMAXIMN/a450avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX232EEPEMAXIM ?N/a150avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX232EEPEMAXIMN/a625avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX232EESEMAXIMN/a96avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX232EESEMAXIM ?N/a1500avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX232EESEMAXN/a12500avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX232EEWEMAXIMN/a14avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX241ECAIMAXIMN/a300avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX241ECAI. |MAX241ECAIMAXIMN/a7avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX241ECWIMAXN/a44avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX241ECWIMAXIMN/a980avai【15kV ESD-Protected, +5V RS-232 Transceivers
MAX241ECWIMAXIM ?N/a20avai【15kV ESD-Protected, +5V RS-232 Transceivers


MAX232EESE ,【15kV ESD-Protected, +5V RS-232 TransceiversApplications 60% less board space. The MAX202E/MAX232E comeMAX3233E/MAX3235E: ±15kV ESD-Protected,i ..
MAX232EESE ,【15kV ESD-Protected, +5V RS-232 TransceiversApplications specifications at data rates up to 120kbps, when loadedMAX3221/MAX3223/MAX3243: 1µA Su ..
MAX232EESE ,【15kV ESD-Protected, +5V RS-232 TransceiversApplications Ordering Information, Pin Configurations, and TypicalOperating Circuits appear at end ..
MAX232EESE+ ,±15kV ESD-Protected, +5V RS-232 TransceiversGeneral Description Benefits and
MAX232EESE+ ,±15kV ESD-Protected, +5V RS-232 Transceiversfeatures are outlined in the Selector Guide. Thedrivers and receivers for all ten devices meet all ..
MAX232EESE+T ,±15kV ESD-Protected, +5V RS-232 TransceiversFeaturesThe MAX202E-MAX213E, MAX232E, and MAX241E are a• Saves Board Spacefamily of RS-232 and V.28 ..
MAX543BCPA+ ,Serial, CMOS, Multiplying, 12-Bit DAC in 8-Pin PackageFeatures . 12-Blt Accuracy in 8-Pln MlnIDIP or SO . Fast 3-ere Serial Interface . Low INL and DN ..
MAX543BCSA ,CMOS, 12-Bit, Seral-Input Multiplying DACGeneral Description The MAX543 is a 12-bit, current-output, multiplying digi- tal-to-analog con ..
MAX543BCSA+ ,Serial, CMOS, Multiplying, 12-Bit DAC in 8-Pin PackageGeneral Description The MAX543 is a 12-bit, current-output, multiplying digi- tal-to-analog con ..
MAX543BCWE ,CMOS, 12-Bit, Seral-Input Multiplying DACApplications Automatic Calibration Motion-Control Systems pp-Controlled Systems Programmabl ..
MAX543BCWE ,CMOS, 12-Bit, Seral-Input Multiplying DACApplications Automatic Calibration Motion-Control Systems pp-Controlled Systems Programmabl ..
MAX543BCWE+ ,Serial, CMOS, Multiplying, 12-Bit DAC in 8-Pin PackageELECTRICAL CHARACTERISTICS (VDD = +5V, +12V or +15V; VREF = +1OV; VlouT = GND = 0V; TA = TMIN to ..


MAX202ECPE-MAX202ECSE-MAX202ECWE-MAX202EEPE-MAX202EESE-MAX202EEWE-MAX203ECPP-MAX203ECWP-MAX203ECWP+-MAX203EEPP-MAX203EEPP+-MAX203EEWP-MAX203EEWP+-MAX205ECPG-MAX206ECAG-MAX206ECNG-MAX206ECWG-MAX206EEWG-MAX207ECAG-MAX207ECWG-MAX207EEAG-MAX208ECAG-MAX208EC
【15kV ESD-Protected, +5V RS-232 Transceivers
General Description
The MAX202E–MAX213E, MAX232E/MAX241E line
drivers/receivers are designed for RS-232 and V.28
communications in harsh environments. Each transmitter
output and receiver input is protected against ±15kV
electrostatic discharge (ESD) shocks, without latchup.
The various combinations of features are outlined in the
Selector Guide.The drivers and receivers for all ten
devices meet all EIA/TIA-232E and CCITT V.28
specifications at data rates up to 120kbps, when loaded
in accordance with the EIA/TIA-232E specification.
The MAX211E/MAX213E/MAX241E are available in 28-
pin SO packages, as well as a 28-pin SSOP that uses
60% less board space. The MAX202E/MAX232E come
in 16-pin TSSOP, narrow SO, wide SO, and DIP
packages. The MAX203E comes in a 20-pin DIP/SO
package, and needs no external charge-pump
capacitors. The MAX205E comes in a 24-pin wide DIP
package, and also eliminates external charge-pump
capacitors. The MAX206E/MAX207E/MAX208E come in
24-pin SO, SSOP, and narrow DIP packages. The
MAX232E/MAX241E operate with four 1µF capacitors,
while the MAX202E/MAX206E/MAX207E/MAX208E/
MAX211E/MAX213E operate with four 0.1µF capacitors,
further reducing cost and board space.
________________________Applications

Notebook, Subnotebook, and Palmtop Computers
Battery-Powered Equipment
Hand-Held Equipment
Next-Generation Device Features
For Low-Voltage Applications
MAX3222E/MAX3232E/MAX3237E/MAX3241E/
MAX3246E: ±15kV ESD-Protected Down to
10nA, +3.0V to +5.5V, Up to 1Mbps, True RS-232
Transceivers (MAX3246E Available in a UCSP™
Package)
For Low-Power Applications
MAX3221/MAX3223/MAX3243: 1µA Supply
Current, True +3V to +5.5V RS-232 Transceivers
with Auto-Shutdown™
For Space-Constrained Applications
MAX3233E/MAX3235E: ±15kV ESD-Protected,
1µA, 250kbps, +3.0V/+5.5V, Dual RS-232
Transceivers with Internal Capacitors
For Low-Voltage or Data Cable Applications
MAX3380E/MAX3381E: +2.35V to +5.5V, 1µA,
2Tx/2Rx RS-232 Transceivers with ±15kV ESD-
Protected I/O and Logic Pins
MAX202E–MAX213E, MAX232E/MAX241E
±15kV ESD-Protected, +5V RS-232 Transceivers
Selector Guide

19-0175; Rev 5; 10/03
Ordering Information, Pin Configurations, and Typical
Operating Circuits appear at end of data sheet.

AutoShutdown and UCSP are trademarks of Maxim Integrated
Products, Inc.
MAX202E–MAX213E, MAX232E/MAX241E
±15kV ESD-Protected, +5V RS-232 Transceivers
ABSOLUTE MAXIMUM RATINGS

VCC..........................................................................-0.3V to +6V
V+................................................................(VCC- 0.3V) to +14V
V-............................................................................-14V to +0.3V
Input Voltages
T_IN............................................................-0.3V to (V+ + 0.3V)
R_IN...................................................................................±30V
Output Voltages
T_OUT.................................................(V- - 0.3V) to (V+ + 0.3V)
R_OUT......................................................-0.3V to (VCC+ 0.3V)
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
16-Pin Wide SO (derate 9.52mW/°C above +70°C)......762mW
16-Pin TSSOP (derate 9.4mW/°C above +70°C)...........755mW
20-Pin Plastic DIP (derate 11.11mW/°C above +70°C)...889mW
20-Pin SO (derate 10.00mW/°C above +70°C).............800mW
24-Pin Narrow Plastic DIP
(derate 13.33mW/°C above +70°C) ...............................1.07W
24-Pin Wide Plastic DIP
(derate 14.29mW/°C above +70°C)................................1.14W
24-Pin SO (derate 11.76mW/°C above +70°C).............941mW
24-Pin SSOP (derate 8.00mW/°C above +70°C)..........640mW
28-Pin SO (derate 12.50mW/°C above +70°C)....................1W
28-Pin SSOP (derate 9.52mW/°C above +70°C)..........762mW
Operating Temperature Ranges
MAX2_ _EC_ _.....................................................0°C to +70°C
MAX2_ _EE_ _...................................................-40°C to +85°C
Storage Temperature Range.............................-65°C to +165°C
Lead Temperature (soldering, 10sec).............................+300°C
ELECTRICAL CHARACTERISTICS

(VCC= +5V ±10% for MAX202E/206E/208E/211E/213E/232E/241E; VCC= +5V ±5% for MAX203E/205E/207E; C1–C4 = 0.1µF for
MAX202E/206E/207E/208E/211E/213E; C1–C4 = 1µF for MAX232E/241E; TA= TMINto TMAX; unless otherwise noted. Typical values
are at TA= +25°C.)
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.
MAX202E–MAX213E, MAX232E/MAX241E
±15kV ESD-Protected, +5V RS-232 Transceivers
ELECTRICAL CHARACTERISTICS (continued)

(VCC= +5V ±10% for MAX202E/206E/208E/211E/213E/232E/241E; VCC= +5V ±5% for MAX203E/205E/207E; C1–C4 = 0.1µF for
MAX202E/206E/207E/208E/211E/213E; C1–C4 = 1µF for MAX232E/241E; TA= TMINto TMAX; unless otherwise noted. Typical values
are at TA= +25°C.)
Note 1:
MAX211EE_ _ tested with VCC= +5V ±5%.
MAX202E–MAX213E, MAX232E/MAX241E
±15kV ESD-Protected, +5V RS-232 Transceivers
__________________________________________Typical Operating Characteristics

(Typical Operating Circuits, VCC= +5V, TA= +25°C, unless otherwise noted.)
MAX202E–MAX213E, MAX232E/MAX241E
±15kV ESD-Protected, +5V RS-232 Transceivers
____________________________Typical Operating Characteristics (continued)

(Typical Operating Circuits, VCC= +5V, TA= +25°C, unless otherwise noted.)
MAX202E–MAX213E, MAX232E/MAX241E
±15kV ESD-Protected, +5V RS-232 Transceivers
MAX203E
MAX205E
_____________________________________________________________Pin Descriptions
MAX202E/MAX232E
MAX202E–MAX213E, MAX232E/MAX241E
±15kV ESD-Protected, +5V RS-232 Transceivers
MAX208E
________________________________________________Pin Descriptions (continued)
MAX206E
MAX207E
MAX202E–MAX213E, MAX232E/MAX241E
±15kV ESD-Protected, +5V RS-232 Transceivers

Figure 1. Shutdown-Current Test Circuit (MAX206E,
MAX211E/MAX213E/MAX241E)
Figure 2. Receiver Output Enable and Disable Timing
(MAX205E/MAX206E/MAX211E/MAX213E/MAX241E)
________________________________________________Pin Descriptions (continued)
MAX211E/MAX213E/MAX241E
MAX202E–MAX213E, MAX232E/MAX241E
±15kV ESD-Protected, +5V RS-232 Transceivers

Figure 3. Transition Slew-Rate Circuit
_______________Detailed Description

The MAX202E–MAX213E, MAX232E/MAX241E consist of
three sections: charge-pump voltage converters,
drivers (transmitters), and receivers. These E versions
provide extra protection against ESD. They survive
±15kV dischargesto the RS-232 inputs andoutputs,
testedusingthe Human Body Model. When tested
according to IEC1000-4-2, they survive ±8kV contact-
discharges and ±15kV air-gap discharges. The rugged
E versions are intended for use in harsh environments
or applications where the RS-232 connection is
frequently changed (such as notebook computers). The
standard (non-“E”) MAX202, MAX203, MAX205–
MAX208, MAX211, MAX213, MAX232, and MAX241 are
recommended for applications where cost is critical.
+5V to ±10V Dual Charge-Pump
Voltage Converter

The +5V to ±10V conversion is performed by dual
charge-pump voltage converters (Figure 4). The first
charge-pump converter uses capacitor C1 to double
the +5V into +10V, storing the +10V on the output filter
capacitor, C3. The second uses C2 to invert the +10V
into -10V, storing the -10V on the V- output filter
capacitor, C4.
In shutdown mode, V+ is internally connected to VCCby
a 1kΩpull-down resistor, and V- is internally connected
to ground by a 1kΩpull up resistor.
RS-232 Drivers

With VCC= 5V, the typical driver output voltage swing
is ±8V when loaded with a nominal 5kΩRS-232
receiver. The output swing is guaranteed to meet
EIA/TIA-232E and V.28 specifications that call for ±5V
minimum output levels under worst-case conditions.
These include a 3kΩload, minimum VCC, and
maximum operating temperature. The open-circuit
output voltage swings from (V+ - 0.6V) to V-.
Input thresholds are CMOS/TTL compatible. The
unused drivers’ inputs on the MAX205E–MAX208E,
MAX211E, MAX213E, and MAX241E can be left
unconnected because 400kΩpull up resistors to VCC
are included on-chip. Since all drivers invert, the pull up
resistors force the unused drivers’ outputs low. The
MAX202E, MAX203E, and MAX232E do not have pull
up resistors on the transmitter inputs.
MAX202E–MAX213E, MAX232E/MAX241E
±15kV ESD-Protected, +5V RS-232 Transceivers

When in low-power shutdown mode, the MAX205E/
MAX206E/MAX211E/MAX213E/MAX241E driver outputs
are turned off and draw only leakage currents—even if
they are back-driven with voltages between 0V and
12V. Below -0.5V in shutdown, the transmitter output is
diode-clamped to ground with a 1kΩseries
impedance.
RS-232 Receivers

The receivers convert the RS-232 signals to CMOS-logic
output levels. The guaranteed 0.8V and 2.4V receiver
input thresholds are significantly tighter than the ±3V
thresholds required by the EIA/TIA-232E specification.
This allows the receiver inputs torespond to TTL/CMOS-
logic levels, as well as RS-232 levels.
The guaranteed 0.8V input low threshold ensures that
receivers shorted to ground have a logic 1 output. The
5kΩinput resistance to ground ensures that a receiver
with its input left open will also have a logic 1 output.
Receiver inputs have approximately 0.5V hysteresis.
This provides clean output transitions, even with slow
rise/fall-time signals with moderate amounts of noise
and ringing.
In shutdown, the MAX213E’s R4 and R5 receivers have
no hysteresis.
Shutdown and Enable Control
(MAX205E/MAX206E/MAX211E/
MAX213E/MAX241E)

In shutdown mode, the charge pumps are turned off,
V+ is pulled down to VCC, V- is pulled to ground, and
the transmitter outputs are disabled. This reduces
supply current typically to 1µA (15µA for the MAX213E).
The time required to exit shutdown is under 1ms, as
shown in Figure 5.
Receivers

All MAX213E receivers, except R4 and R5, are put into
a high-impedance state in shutdown mode (see Tables
1a and 1b). The MAX213E’s R4 and R5 receivers still
function in shutdown mode. These two awake-in-
shutdown receivers can monitor external activity while
maintaining minimal power consumption.
The enable control is used to put the receiver outputs into
a high-impedance state, to allow wire-OR connection of
two EIA/TIA-232E ports (or ports of different types) at the
UART. It has no effect on the RS-232 drivers or the
charge pumps.
Note:
The enable control pin is active low for the
MAX211E/MAX241E (EN), but is active high for the
MAX213E (EN). The shutdown control pin is active high
for the MAX205E/MAX206E/MAX211E/MAX241E
(SHDN), but is active low for the MAX213E (SHDN).
Figure 4. Charge-Pump Diagram
MAX202E–MAX213E, MAX232E/MAX241E
±15kV ESD-Protected, +5V RS-232 Transceivers

Figure 5. MAX211E V+ and V- when Exiting Shutdown (0.1µF
capacitors)
X = Don't Care
Table 1a. MAX205E/MAX206E/MAX211E/
MAX241E Control Pin Configurations
Table 1b. MAX213E Control Pin
Configurations

The MAX213E’s receiver propagation delay is typically
0.5µs in normal operation. In shutdown mode,
propagation delay increases to 4µs for both rising and
falling transitions. The MAX213E’s receiver inputs have
approximately 0.5V hysteresis, except in shutdown,
when receivers R4 and R5 have no hysteresis.
When entering shutdown with receivers active, R4 and
R5 are not valid until 80µs after SHDNis driven low.
When coming out of shutdown, all receiver outputs are
invalid until the charge pumps reach nominal voltage
levels (less than 2ms when using 0.1µF capacitors).
±15kV ESD Protection

As with all Maxim devices, ESD-protection structures
are incorporated on all pins to protect against
electrostatic discharges encountered during handling
and assembly. The driver outputs and receiver inputs
have extra protection against static electricity. Maxim’s
engineers developed state-of-the-art structures to
protect these pins against ESD of ±15kV without
damage. The ESD structures withstand high ESD in all
states: normal operation, shutdown, and powered
down. After an ESD event, Maxim’s Eversions keep
working without latchup, whereas competing RS-232
products can latch and must be powered down to
remove latchup.
ESD protection can be tested in various ways; the
transmitter outputs and receiver inputs of this product
family are characterized for protection to the following
limits:±15kV using the Human Body Model±8kV using the contact-discharge method specified
in IEC1000-4-2±15kV using IEC1000-4-2’s air-gap method.
ESD Test Conditions

ESD performance depends on a variety of conditions.
Contact Maxim for a reliability report that documents
test set-up, test methodology, and test results.
Human Body Model

Figure 6a shows the Human Body Model, and Figure
6b shows the current waveform it generates when
discharged into a low impedance. This model consists
of a 100pF capacitor charged to the ESD voltage of
interest, which is then discharged into the test device
through a 1.5kΩresistor.
MAX202E–MAX213E, MAX232E/MAX241E
±15kV ESD-Protected, +5V RS-232 Transceivers
IEC1000-4-2

The IEC1000-4-2 standard covers ESD testing and
performance of finished equipment; it does not
specifically refer to integrated circuits. The
MAX202E/MAX203E–MAX213E, MAX232E/MAX241E
help you design equipment that meets level 4 (the
highest level) of IEC1000-4-2, without the need for
additional ESD-protection components.
The major difference between tests done using the
Human Body Model and IEC1000-4-2 is higher peak
current in IEC1000-4-2, because series resistance is
lower in the IEC1000-4-2 model. Hence, the ESD
withstand voltage measured to IEC1000-4-2 is
generally lower than that measured using the Human
Body Model. Figure 7b shows the current waveform for
the 8kV IEC1000-4-2 level-four ESD contact-discharge
test.
The air-gap test involves approaching the device with a
charged probe. The contact-discharge method
connects the probe to the device before the probe is
energized.
Machine Model

The Machine Model for ESD tests all pins using a
200pF storage capacitor and zero discharge
resistance. Its objective is to emulate the stress caused
by contact that occurs with handling and assembly
during manufacturing. Of course, all pins require this
protection during manufacturing, not just RS-232 inputs
and outputs. Therefore,after PC board assembly,the
Machine Model is less relevant to I/O ports.
Figure 7a. IEC1000-4-2 ESD Test Model
MAX202E–MAX213E, MAX232E/MAX241E
±15kV ESD-Protected, +5V RS-232 Transceivers
__________Applications Information
Capacitor Selection

The capacitor type used for C1–C4 is not critical for
proper operation. The MAX202E, MAX206–MAX208E,
MAX211E, and MAX213E require 0.1µF capacitors,
and the MAX232E and MAX241E require 1µF
capacitors, although in all cases capacitors up to 10µF
can be used without harm. Ceramic, aluminum-
electrolytic, or tantalum capacitors are suggested for
the 1µF capacitors, and ceramic dielectrics are
suggested for the 0.1µF capacitors. When using the
minimum recommended capacitor values, make sure
the capacitance value does not degrade excessively
as the operating temperature varies. If in doubt, use
capacitors with a larger (e.g., 2x) nominal value. The
capacitors’ effective series resistance (ESR), which
usually rises at low temperatures, influences the
amount of ripple on V+ and V-.
Use larger capacitors (up to 10µF) to reduce the output
impedance at V+ and V-. This can be useful when
“stealing” power from V+ or from V-. The MAX203E and
MAX205E have internal charge-pump capacitors.
Bypass VCCto ground with at least 0.1µF. In
applications sensitive to power-supply noise generated
by the charge pumps, decouple VCCto ground with a
capacitor the same size as (or larger than) the charge-
pump capacitors (C1–C4).
V+ and V- as Power Supplies

A small amount of power can be drawn from V+ and V-,
although this will reduce both driver output swing and
noise margins. Increasing the value of the charge-pump
capacitors (up to 10µF) helps maintain performance
when power is drawn from V+ or V-.
Driving Multiple Receivers

Each transmitter is designed to drive a single receiver.
Transmitters can be paralleled to drive multiple
receivers.
Driver Outputs when Exiting Shutdown

The driver outputs display no ringing or undesirable
transients as they come out of shutdown.
High Data Rates

These transceivers maintain the RS-232 ±5.0V
minimum driver output voltages at data rates of over
120kbps. For data rates above 120kbps, refer to the
Transmitter Output Voltage vs. Load Capacitance
graphs in the Typical Operating Characteristics.
Communication at these high rates is easier if the
capacitive loads on the transmitters are small; i.e.,
short cables are best.
Table 2. Summary of EIA/TIA-232E, V.28 Specifications
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