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Home ›  MM44 > MAX3222ECAP-MAX3222ECUP-MAX3222ECWN-MAX3222EEAP-MAX3222EEUP-MAX3222EEWN-MAX3232ECAE-MAX3232ECPE-MAX3232ECUP-MAX3232ECWE-MAX3232EEAE-MAX3232EEPE-MAX3232EEUP-MAX3232EEWE-MAX3237ECAE-MAX3237EEAI-MAX3241ECAI-MAX3241EEAI-MAX3241EEWI,+-15kV ESD-protected, down to 10nA, 3.0V to5.5V, up to 1Mbps, true RS-232 transceiver.
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MAX3232ECAEMAXIMN/a500avai+-15kV ESD-protected, down to 10nA, 3.0V to5.5V, up to 1Mbps, true RS-232 transceiver.
MAX3232ECPEMAXIM ?N/a14avai+-15kV ESD-protected, down to 10nA, 3.0V to5.5V, up to 1Mbps, true RS-232 transceiver.
MAX3232ECPEMAXIMN/a22avai+-15kV ESD-protected, down to 10nA, 3.0V to5.5V, up to 1Mbps, true RS-232 transceiver.
MAX3232ECUPMAXIMN/a50avai+-15kV ESD-protected, down to 10nA, 3.0V to5.5V, up to 1Mbps, true RS-232 transceiver.
MAX3232ECUPMAXN/a300avai+-15kV ESD-protected, down to 10nA, 3.0V to5.5V, up to 1Mbps, true RS-232 transceiver.
MAX3232ECWEMAXIMN/a123avai+-15kV ESD-protected, down to 10nA, 3.0V to5.5V, up to 1Mbps, true RS-232 transceiver.
MAX3232ECWEMAXN/a12avai+-15kV ESD-protected, down to 10nA, 3.0V to5.5V, up to 1Mbps, true RS-232 transceiver.
MAX3232EEAEMAXIMN/a290avai+-15kV ESD-protected, down to 10nA, 3.0V to5.5V, up to 1Mbps, true RS-232 transceiver.
MAX3237ECAEMAXIM ?N/a176avai+-15kV ESD-protected, down to 10nA, 3.0V to5.5V, up to 1Mbps, true RS-232 transceiver.
MAX3237EEAIMAXIMN/a44avai+-15kV ESD-protected, down to 10nA, 3.0V to5.5V, up to 1Mbps, true RS-232 transceiver.
MAX3237EEAIMAXN/a15avai+-15kV ESD-protected, down to 10nA, 3.0V to5.5V, up to 1Mbps, true RS-232 transceiver.
MAX3241ECAIMAXN/a166avai+-15kV ESD-protected, down to 10nA, 3.0V to5.5V, up to 1Mbps, true RS-232 transceiver.
MAX3241ECAIMAXIM ?N/a945avai+-15kV ESD-protected, down to 10nA, 3.0V to5.5V, up to 1Mbps, true RS-232 transceiver.
MAX3241ECAIMAXIMN/a230avai+-15kV ESD-protected, down to 10nA, 3.0V to5.5V, up to 1Mbps, true RS-232 transceiver.
MAX3241EEAIMAXIMN/a196avai+-15kV ESD-protected, down to 10nA, 3.0V to5.5V, up to 1Mbps, true RS-232 transceiver.
MAX3241EEAIMAXN/a33avai+-15kV ESD-protected, down to 10nA, 3.0V to5.5V, up to 1Mbps, true RS-232 transceiver.
MAX3241EEAIMAXIM ?N/a1480avai+-15kV ESD-protected, down to 10nA, 3.0V to5.5V, up to 1Mbps, true RS-232 transceiver.
MAX3241EEWIMAXIMN/a3400avai+-15kV ESD-protected, down to 10nA, 3.0V to5.5V, up to 1Mbps, true RS-232 transceiver.
MAX3232EEWEMAXIMN/a4000avai+-15kV ESD-protected, down to 10nA, 3.0V to5.5V, up to 1Mbps, true RS-232 transceiver.
MAX3232EEPEMAXIM ?N/a15avai+-15kV ESD-protected, down to 10nA, 3.0V to5.5V, up to 1Mbps, true RS-232 transceiver.
MAX3232EEUPMAXIMN/a500avai+-15kV ESD-protected, down to 10nA, 3.0V to5.5V, up to 1Mbps, true RS-232 transceiver.
MAX3232EEUPMAXN/a152avai+-15kV ESD-protected, down to 10nA, 3.0V to5.5V, up to 1Mbps, true RS-232 transceiver.
MAX3222ECAPMAXIMN/a100avai+-15kV ESD-protected, down to 10nA, 3.0V to5.5V, up to 1Mbps, true RS-232 transceiver.
MAX3222ECUPMAXIMN/a41avai+-15kV ESD-protected, down to 10nA, 3.0V to5.5V, up to 1Mbps, true RS-232 transceiver.
MAX3222ECUPMAXN/a31avai+-15kV ESD-protected, down to 10nA, 3.0V to5.5V, up to 1Mbps, true RS-232 transceiver.
MAX3222ECWNMAXIMN/a53avai+-15kV ESD-protected, down to 10nA, 3.0V to5.5V, up to 1Mbps, true RS-232 transceiver.
MAX3222EEAPMAXIMN/a91avai+-15kV ESD-protected, down to 10nA, 3.0V to5.5V, up to 1Mbps, true RS-232 transceiver.
MAX3222EEUPN/a42avai+-15kV ESD-protected, down to 10nA, 3.0V to5.5V, up to 1Mbps, true RS-232 transceiver.
MAX3222EEUPMAXN/a5avai+-15kV ESD-protected, down to 10nA, 3.0V to5.5V, up to 1Mbps, true RS-232 transceiver.
MAX3222EEUPMAXIMN/a189avai+-15kV ESD-protected, down to 10nA, 3.0V to5.5V, up to 1Mbps, true RS-232 transceiver.
MAX3222EEWNMaxim N/a31avai+-15kV ESD-protected, down to 10nA, 3.0V to5.5V, up to 1Mbps, true RS-232 transceiver.


MAX3232EEWE ,+-15kV ESD-protected, down to 10nA, 3.0V to5.5V, up to 1Mbps, true RS-232 transceiver.ELECTRICAL CHARACTERISTICS(V = +3.0V to +5.5V, C1–C4 = 0.1µF, T = T to T , unless otherwise noted. ..
MAX3232EEWE+ ,±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 TransceiversGeneral Description Next-Generation Device
MAX3232EEWE+T ,±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V, Up to 1Mbps, True RS-232 TransceiversApplicationselectrostatic-discharge (ESD) protection. The enhancedMAX3380E/MAX3381E: +2.35V to +5.5 ..
MAX3232EID ,3-V to 5.5-V Multichannel RS-232 Line Driver/Receiver With +/-15kV IEC ESD Protection 16-SOIC -40 to 85Maximum Ratings(1)over operating free-air temperature range (unless otherwise noted)MIN MAX UNIT(2) ..
MAX3232EIDBR ,3-V to 5.5-V Multichannel RS-232 Line Driver/Receiver With +/-15kV IEC ESD Protection 16-SSOP -40 to 85Block Diagram..... 82 Applications..... 18.3 Feature Description...... 83 Description....... 18.4 D ..
MAX3232EIDBRG4 ,3-V to 5.5-V Multichannel RS-232 Line Driver/Receiver With +/-15kV IEC ESD Protection 16-SSOP -40 to 85Maximum Ratings . 410 Power Supply Recommendations... 126.2 ESD Ratings ...... 411 Layout.... 126.3 ..
MAX6709BUB+ ,Low-Voltage, High-Accuracy, Quad Voltage Monitors in µMAX Packageapplications.♦ Adjustable Voltage Threshold Monitors Down toThe selection includes input options fo ..
MAX6709DUB ,35 mA, 2.0 V to 5.5 V, low-voltage, high-accuracy, quad voltage monitorMAX6709/MAX671419-2379; Rev 0; 4/02Low-Voltage, High-Accuracy, Quad VoltageMonitors in µMAX Package
MAX6709DUB+ ,Low-Voltage, High-Accuracy, Quad Voltage Monitors in µMAX PackageApplicationsnumber when ordering.TelecommunicationsPin ConfigurationsServersHigh-End PrintersTOP VI ..
MAX6709EUB ,35 mA, 2.0 V to 5.5 V, low-voltage, high-accuracy, quad voltage monitorApplicationsTelecommunicationsPin ConfigurationsServersHigh-End PrintersTOP VIEWDesktop and Noteboo ..
MAX6709EUB ,35 mA, 2.0 V to 5.5 V, low-voltage, high-accuracy, quad voltage monitorApplicationsTelecommunicationsPin ConfigurationsServersHigh-End PrintersTOP VIEWDesktop and Noteboo ..
MAX6709EUB ,35 mA, 2.0 V to 5.5 V, low-voltage, high-accuracy, quad voltage monitorMAX6709/MAX671419-2379; Rev 0; 4/02Low-Voltage, High-Accuracy, Quad VoltageMonitors in µMAX Package


MAX3222ECAP-MAX3222ECUP-MAX3222ECWN-MAX3222EEAP-MAX3222EEUP-MAX3222EEWN-MAX3232ECAE-MAX3232ECPE-MAX3232ECUP-MAX3232ECWE-MAX3232EEAE-MAX3232EEPE-MAX3232EEUP-MAX3232EEWE-MAX3237ECAE-MAX3237EEAI-MAX3241ECAI-MAX3241EEAI-MAX3241EEWI
+-15kV ESD-protected, down to 10nA, 3.0V to5.5V, up to 1Mbps, true RS-232 transceiver.
________________General Description
The MAX3222E/MAX3232E/MAX3237E/MAX3241E are
3V-powered EIA/TIA-232 and V.28/V.24 communications
interfaces with low power requirements, high data-
rate capabilities, and enhanced electrostatic discharge
(ESD) protection. All transmitter outputs and receiver
inputs are protected to ±15kV using IEC 1000-4-2 Air-
Gap Discharge, ±8kV using IEC 1000-4-2 Contact Dis-
charge, and ±15kV using the Human Body Model. The
MAX3237E’s logic and receiver I/O pins are protected to
the above standards, while the transmitter output pins are
protected to ±15kV using the Human Body Model.
The transceivers have a proprietary low-dropout transmit-
ter output stage, delivering true RS-232 performance from
a +3.0V to +5.5V supply with a dual charge pump. The
charge pump requires only four small 0.1µF capacitors
for operation from a +3.3V supply. Each device is guaran-
teed to run at data rates of 250kbps while maintaining RS-
232 output levels. The MAX3237E is guaranteed to run at
data rates of 250kbps in the normal operating mode and
1Mbps in the MegaBaud™ operating modewhile main-
taining RS-232-compliant output levels.
The MAX3222E/MAX3232E have two receivers and two
drivers. The MAX3222E features a 1µA shutdown mode
that reduces power consumption and extends battery
life in portable systems. Its receivers can remain active
in shutdown mode, allowing external devices such as
modems to be monitored using only 1µA supply current.
Both the MAX3222E and MAX3232E are pin, package,
and functionally compatible with the industry-standard
MAX242 and MAX232, respectively.
The MAX3241E is a complete serial port (three drivers/five
receivers) designed for notebook and subnotebook com-
puters. The MAX3237E (five drivers/three receivers) is ideal
for peripheral applications that require fast data transfer.
Both devices feature a shutdown mode in which all
receivers can remain active while using a supply cur-
rent of only 1µA (MAX3241E) or 10nA (MAX3237E). The
MAX3237E/MAX3241E have additional receiver outputs
that always remain active.
The MAX3222E and MAX3232E are available in space-
saving SO, SSOP, and TSSOP packages. The MAX3241E
is available in SO and SSOP packages. The MAX3237E is
available in an SSOP package.
________________________Applications

Notebooks, Subnotebooks, Smart Phones
and Palmtop ComputersXDSL Modems
Battery-Powered EquipmentPrinters
Cell-Phone Data CablesCell Phones
____________________________Features
ESD Protection for RS-232 I/O Pins
(MAX3222E/MAX3232E/MAX3241E)
±15kV—Human Body Model
±8kV—IEC 1000-4-2, Contact Discharge
±15kV—IEC 1000-4-2, Air-Gap Discharge
ESD Protection for All Logic and Receiver I/O
Pins (MAX3237E)
±15kV—Human Body Model
±8kV—IEC 1000-4-2, Contact Discharge
±15kV—IEC 1000-4-2, Air-Gap Discharge
ESD Protection for Transmitter Output Pins
(MAX3237E)
±15kV—Human Body Model
Guaranteed Data Rate
250kbps (MAX3222E/MAX3232E/MAX3241E
and MAX3237E, normal operation)
1Mbps (MAX3237E, MegaBaud operation)
Latchup FreeLow-Power Shutdown with Receivers Active
1µA (MAX3222E/MAX3241E)
10nA (MAX3237E)
Flow-Through Pinout (MAX3237E)Guaranteed Mouse Driveability (MAX3241E)Meets EIA/TIA-232 Specifications Down to 3.0V
MAX3222E/MAX3232E/MAX3237E/MAX3241E15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers

19-1298; Rev 3a; 1/00
†Covered by U.S. Patent numbers 4,636,930; 4,679,134; 4,777,577; 4,797,899; 4,809,152; 4,897,774; 4,999,761; and other patents pending.
MegaBaud is a trademark of Maxim Integrated Products.
MAX3222E/MAX3232E/MAX3237E/MAX3241E
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS

(VCC= +3.0V to +5.5V, C1–C4 = 0.1µF, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)
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.
VCCto GND..............................................................-0.3V to +6V
V+ to GND (Note 1)..................................................-0.3V to +7V
V- to GND (Note 1)...................................................+0.3V to -7V
V+ + |V-| (Note 1).................................................................+13V
Input Voltages
T_IN, EN, SHDN, MBAUD to GND........................-0.3V to +6V
R_IN to GND.....................................................................±25V
Output Voltages
T_OUT to GND...............................................................±13.2V
R_OUT, R_OUTB (MAX3241E)................-0.3V to (VCC+ 0.3V)
Short-Circuit Duration, T_OUT to GND.......................Continuous
Continuous Power Dissipation (TA= +70°C)
16-Pin SSOP (derate 7.14mW/°C above +70°C)..........571mW
16-Pin Wide SO (derate 9.52mW/°C above +70°C).....762mW
18-Pin Wide SO (derate 9.52mW/°C above +70°C).....762mW
18-Pin PDIP (derate 11.11mW/°C above +70°C)..........889mW
20-Pin TSSOP (derate 7.0mW/°C above +70°C)..........559mW
20-Pin SSOP (derate 8.00mW/°C above +70°C)..........640mW
28-Pin SSOP (derate 9.52mW/°C above +70°C)..........762mW
28-Pin Wide SO (derate 12.50mW/°C above +70°C).............1W
Operating Temperature Ranges
MAX32_ _EC_ _...................................................0°C to +70°C
MAX32_ _EE_ _.................................................-40°C to +85°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
Note 1:
V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.
MAX3222E/MAX3232E/MAX3237E/MAX3241E15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers
Note 2:
MAX3222E/MAX3232E/MAX3241E: C1–C4 = 0.1µF tested at 3.3V ±10%; C1 = 0.047µF, C2–C4 = 0.33µF tested at 5.0V
±10%. MAX3237E: C1–C4 = 0.1µF, tested at 3.3V ±5%; C1–C4 = 0.22µF tested at 3.3V ±10%; C1 = 0.047µF, C2–C4 =
0.33µF tested at 5.0V ±10%.
Note 3:
The MAX3237E logic inputs have an active positive feedback resistor. The input current goes to zero when the inputs are at
the supply rails.
ELECTRICAL CHARACTERISTICS (continued)

(VCC= +3.0V to +5.5V, C1–C4 = 0.1µF, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)
TIMING CHARACTERISTICS—MAX3222E/MAX3232E/MAX3241E

(VCC= +3.0V to +5.5V, C1–C4 = 0.1µF, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)
__________________________________________Typical Operating Characteristics
(VCC= +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩand CL, TA = +25°C, unless otherwise noted.)
MAX3222E/MAX3232E/MAX3237E/MAX3241E
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers
TIMING CHARACTERISTICS—MAX3237E

(VCC= +3.0V to +5.5V, C1–C4 = 0.1µF, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.) (Note 2)
MAX3222E/MAX3232E/MAX3237E/MAX3241E15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers

MAX3237E
SLEW RATE vs. LOAD CAPACITANCE
(MBAUD = VCC)

MAX3237E toc10
SLEW RATE (V/
MAX3237E
SLEW RATE vs. LOAD CAPACITANCE
(MBAUD = GND)
MAX3237E toc09
LOAD CAPACITANCE (pF)
SLEW RATE (V/
MAX3237E
SUPPLY CURRENT vs. LOAD CAPACITANCE
WHEN TRANSMITTING DATA (MBAUD = GND)
MAX3237E toc11
LOAD CAPACITANCE (pF)
SUPPLY CURRENT (mA)
MAX3237E
TRANSMITTER SKEW vs. LOAD CAPACITANCE
(MBAUD = VCC)
MAX3237E toc12
LOAD CAPACITANCE (pF)
TRANSMITTER SKEW (ns)
Typical Operating Characteristics (continued)
______________________________________________________________Pin Description
MAX3222E/MAX3232E/MAX3237E/MAX3241E
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceiversypical Operating Characteristics (continued)

(VCC= +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩand CL, TA = +25°C, unless otherwise noted.)
_______________Detailed Description
Dual Charge-Pump Voltage Converter

The MAX3222E/MAX3232E/MAX3237E/MAX3241E’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 VCCrange. 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 reservoir capacitor
(C3, C4) to generate the V+ and V- supplies (Figure 1).
RS-232 Transmitters

The transmitters are inverting level translators that con-
vert TTL/CMOS-logic levels to ±5.0V EIA/TIA-232-com-
pliant levels.
The MAX3222E/MAX3232E/MAX3237E/MAX3241E
transmitters guarantee a 250kbps data rate with worst-
case loads of 3kΩin parallel with 1000pF, providing
compatibility with PC-to-PC communication software
(such as LapLink™). Transmitters can be paralleled to
drive multiple receivers or mice.
The MAX3222E/MAX3237E/MAX3241E’s transmitters are
disabled and the outputs are forced into a high-imped-
ance state when the device is in shutdown mode (SHDN=
GND). The MAX3222E/MAX3232E/MAX3237E/MAX3241E
permit the outputs to be driven up to ±12V in shutdown.
The MAX3222E/MAX3232E/MAX3241E transmitter
inputs do not have pull-up resistors. Connect unused
inputs to GND or VCC. The MAX3237E transmitter
inputs have a 400kΩactive positive feedback resistor,
allowing unused inputs to be left unconnected.
MAX3237E MegaBaud Operation

For higher-speed serial communications, the MAX3237E
features MegaBaud operation. In MegaBaud operating
mode (MBAUD = VCC), the MAX3237E transmitters
guarantee a 1Mbps data rate with worst-case loads of
3kΩin parallel with 250pF for 3.0V < VCC< 4.5V. For 5V
±10% operation, the MAX3237E transmitters guarantee a
1Mbps data rate into worst-case loads of 3kΩin parallel
with 1000pF.
RS-232 Receivers

The receivers convert RS-232 signals to CMOS-logic
output levels. The MAX3222E/MAX3237E/MAX3241E
receivers have inverting three-state outputs. Drive EN
high to place the receiver(s) into a high-impedance
state. Receivers can be either active or inactive in shut-
down (Table 1).
MAX3222E/MAX3232E/MAX3237E/MAX3241E15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers

LapLink is a trademark of Traveling Software.
MAX3222E/MAX3232E/MAX3237E/MAX3241E
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers

The complementary outputs on the MAX3237E/MAX3241E
(R_OUTB) are always active, regardless of the state of EN
or SHDN. This allows the device to be used for ring indica-
tor applications without forward biasing other devices con-
nected to the receiver outputs. This is ideal for systems
where VCCdrops to 0 in shutdown to accommodate
peripherals such as UARTs (Figure 2).
MAX3222E/MAX3237E/MAX3241E
Shutdown Mode

Supply current falls to less than 1µA in shutdown mode
(SHDN= low). The MAX3237E’s supply current falls to
10nA (typ) when all receiver inputs are in the invalid
range (-0.3V < R_IN < +0.3). When shut down, the
device’s charge pumps are shut off, V+ is pulled down
to VCC, V- is pulled to ground, and the transmitter
outputs are disabled (high impedance). The time
required to recover from shutdown is typically 100µs,
as shown in Figure 3. Connect SHDNto VCCif the shut-
down mode is not used. SHDNhas no effect on R_OUT
or R_OUTB (MAX3237E/MAX3241E).
±15kV ESD Protection

As with all Maxim devices, ESD-protection structures
are incorporated to protect against electrostatic
discharges encountered during handling and assem-
bly. The driver outputs and receiver inputs of the
MAX3222E/MAX3232E/MAX3237E/MAX3241E15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers

MAX3222E/MAX3232E/MAX3237E/MAX3241E have
extra protection against static electricity. Maxim’s engi-
neers have developed state-of-the-art structures to pro-
tect 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 E versions keep working without
latchup, whereas competing RS-232 products can
latch and must be powered down to remove latchup.
Furthermore, the MAX3237E logic I/O pins also have
±15kV ESD protection. Protecting the logic I/O pins to
±15kV makes the MAX3237E ideal for data cable appli-
cations.
ESD protection can be tested in various ways; the
transmitter outputs and receiver inputs for the
MAX3222E/MAX3232E/MAX3241E 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 IEC 1000-4-2’s Air-Gap Discharge
method
For the MAX3237E, all logic and RS-232 I/O pins are
characterized for protection to ±15kV per the Human
Body Model.
ESD Test Conditions

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

Figure 4a shows the Human Body Model, and Figure
4b shows the current waveform it generates when dis-
charged into a low impedance. This model consists of
a 100pF capacitor charged to the ESD voltage of inter-
est, which is then discharged into the test device
through a 1.5kΩresistor.
MAX3222E/MAX3232E/MAX3237E/MAX3241E
±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers
IEC 1000-4-2

The IEC 1000-4-2 standard covers ESD testing and per-
formance of finished equipment; it does not specifically
refer to integrated circuits. The MAX3222E/MAX3232E/
MAX3237E/MAX3241E help you design equipment that
meets Level 4 (the highest level) of IEC 1000-4-2, without
the need for additional ESD-protection components.
The major difference between tests done using the
Human Body Model and IEC 1000-4-2 is higher peak
current in IEC 1000-4-2 because series resistance is
lower in the IEC 1000-4-2 model. Hence, the ESD with-
stand voltage measured to IEC 1000-4-2 is generally
lower than that measured using the Human Body
Model. Figure 5a shows the IEC 1000-4-2 model, and
Figure 5b shows the current waveform for the ±8kV IEC
1000-4-2 Level 4 ESD Contact Discharge test.
The Air-Gap Discharge 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 resis-
tance. Its objective is to emulate the stress caused by
contact that occurs with handling and assembly during
manufacturing. 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.
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