MAX3209ECUU ,【15kV ESD-Protected, 12V, Dual RS-232 Serial Port with Low-Power Standby for Motherboards/Desktopsfeatures a 50μA low-power standby♦ 460kbps Data Rate; LapLink Compatiblemode for compliance with sy ..
MAX3209ECUU ,【15kV ESD-Protected, 12V, Dual RS-232 Serial Port with Low-Power Standby for Motherboards/DesktopsELECTRICAL CHARACTERISTICS(V = +10.8V to +13.2V, V = +3V to +5.5V, C1 = C2 = 0.1μF, T = T to T , un ..
MAX3209ECUU+ ,±15kV ESD-Protected, 12V, Dual RS-232 Serial Port with Low-Power Standby for Motherboards/DesktopsFeaturesThe MAX3209E is a complete, dual DTE RS-232 serial♦ Two Complete Serial Ports in a Single 3 ..
MAX3209ECUU-T ,±15kV ESD-Protected, 12V, Dual RS-232 Serial Port with Low-Power Standby for Motherboards/DesktopsApplicationsDesktop PCsTOP VIEWMotherboardsInstruments40 39 38 37 36 35 3433 32 31Equipment Requiri ..
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MAX3209EEUU+ ,±15kV ESD-Protected, 12V, Dual RS-232 Serial Port with Low-Power Standby for Motherboards/Desktopsfeatures a 50µA low-power standby♦ Enhanced ESD Protectionmode for compliance with system power-man ..
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MAX3209ECUU-MAX3209EEUU
【15kV ESD-Protected, 12V, Dual RS-232 Serial Port with Low-Power Standby for Motherboards/Desktops
General DescriptionThe MAX3209E is a complete, dual DTE RS-232 serial
port (6 transmitters, 10 receivers) for motherboards and
desktop PCs that ensures compliance with the stringent
ESD requirements of the European Community. The
device minimizes board space and power consumption
by eliminating the need for a negative power supply; it
integrates two serial ports and a charge pump into a sin-
gle 38-pin TSSOP package.
The MAX3209E features a 50μA low-power standby
mode for compliance with system power-management
requirements. During standby, while the device oper-
ates from the single +3V to +5.5V logic supply, one
receiver on each port remains active, allowing automatic
system wake-up when peripheral communications
resume.
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 Discharge, and ±15kV
using the Human Body Model, making the device ideal
for use in harsh environments or mission-critical equip-
ment. As a result of its robust charge-pump structure,
the MAX3209E guarantees mouse driveability and true
RS-232 operation at data rates up to 460kbps, ensuring
compatibility with PC-to-PC communication software
(such as LapLink™).
________________________ApplicationsDesktop PCs
Motherboards
Instruments
Equipment Requiring IEC 1000-4-2 Compliance
Telecommunications
Network Servers
FeaturesTwo Complete Serial Ports in a Single 38-Pin
TSSOP PackageRequires Only +12V Supply and Logic
Supply (+3V to +5.5V) No Negative Supply RequiredOne Receiver Active per Port in Standby
for System Wake-Up460kbps Data Rate; LapLink CompatibleEnhanced ESD Protection
±15kV—Human Body Model
±8kV—IEC 1000-4-2, Contact Discharge
±15kV—IEC 1000-4-2, Air-Gap DischargeLow 50μA Standby CurrentOperates with Either +3V or +5V LogicGuaranteed Mouse DriveabilitySmall 0.1μF CapacitorsFlow-Through Pinout
MAX3209E
±15kV ESD-Protected, 12V, Dual RS-232 Serial Port
with Low-Power Standby for Motherboards/Desktops19-1471; Rev 1; 9/99
LapLink is a trademark of Traveling Software.
Pin Configuration
MAX3209E
±15kV ESD-Protected, 12V, Dual RS-232 Serial Port
with Low-Power Standby for Motherboards/Desktops
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VDD= +10.8V to +13.2V, VSTBY= +3V to +5.5V, C1 = C2 = 0.1μF, TA= TMINto TMAX, unless otherwise noted. Typical values are at= +25°C, VDD= +12V, VSTBY= +3.3V.)
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.
VDD.........................................................................-0.3V to +15V
VSTBY.......................................................................-0.3V to +7V...........................................................................+0.3V to -15V
Input Voltages
T_IN......................................................................-0.3V to +7V
R_IN.................................................................................±30V
Output Voltages
T_OUT..............................................................................±15V
R_OUT.................................................-0.3V to (VSTBY+ 0.3V)
Short-Circuit Duration
T_OUT (one at a time)............................................Continuous
R_OUT (one at a time)............................................Continuous
Continuous Power Dissipation (TA= +70°C)
TSSOP (derate 11.8mW/°C above +70°C)..................941mW
Operating Temperature Ranges
MAX3209EC__...................................................0°C to +70°C
MAX3209EE__................................................-40°C to +85°C
Storage Temperature Range ............................-65°C to +150°C
Lead Temperature (soldering, 10sec) ............................+300°C
MAX3209E
±15kV ESD-Protected, 12V, Dual RS-232 Serial Port
with Low-Power Standby for Motherboards/Desktops
ELECTRICAL CHARACTERISTICS (continued)(VDD= +10.8V to +13.2V, VSTBY= +3V to +5.5V, C1 = C2 = 0.1μF, TA= TMINto TMAX, unless otherwise noted. Typical values are at= +25°C, VDD= +12V, VSTBY= +3.3V.)
Typical Operating Characteristics(VSTBY= +5V, VDD= +12V, C1 = C2 = 0.1μF, TA = +25°C, unless otherwise noted.)
MAX3209E
±15kV ESD-Protected, 12V, Dual RS-232 Serial Port
with Low-Power Standby for Motherboards/Desktops
Pin Description
Typical Operating Characteristics (continued)(VSTBY= +5V, VDD= +12V, C1 = C2 = 0.1μF, TA = +25°C, unless otherwise noted.)
Detailed Description
±15kV ESD ProtectionAs with all Maxim devices, ESD-protection structures
are incorporated on all pins to protect against electro-
static discharges (ESD) encountered during handling
and assembly. The MAX3209E driver outputs and
receiver inputs have extra protection against static
electricity found in normal operation. Maxim’s engineers
developed state-of-the-art structures to protect these
pins against ±15kV ESD, without damage. After an ESD
event, theMAX3209E continues working without latchup.
ESD protection can be tested in several ways. The
transmitter outputs and receiver inputs are character-
ized for protection to the following:±15kV using the Human Body Model±8kV using the Contact-Discharge Method specified
in IEC 1000-4-2 (formerly IEC 801-2)±15kV using the Air-Gap Method specified in
IEC 1000-4-2 (formerly IEC 801-2)
ESD Test ConditionsESD performance depends on a number of conditions.
Contact Maxim for a reliability report that documents
test setup, methodology, and results.
Human Body ModelFigure 2a shows the Human Body Model, and Figure
2b 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 interest,
which is then discharged into the device through a
1.5kΩresistor.
IEC 1000-4-2Since January 1996, all equipment manufactured
and/or sold in the European community has been
required to meet the stringent IEC 1000-4-2 specifica-
tion. The IEC 1000-4-2 standard covers ESD testing
and performance of finished equipment; it does not
specifically refer to integrated circuits. The MAX3209E
helps you design equipment that meets Level 4 (the
highest level) of IEC 1000-4-2, without additional ESD-
protection components.
The main 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 ESD test model (Figure 3a), the
ESD withstand voltage measured to this standard is gen-
erally lower than that measured using the Human Body
Model. Figure 3b shows the current waveform for the
±8kV IEC 1000-4-2 Level 4 ESD Contact-Discharge test.
The Air-Gap test involves approaching the device with a
charge probe. The Contact-Discharge method connects
the probe to the device before the probe is energized.
MAX3209E
±15kV ESD-Protected, 12V, Dual RS-232 Serial Port
with Low-Power Standby for Motherboards/DesktopsFigure 2b. Human Body Model Current Waveform
Figure 2a. Human Body ESD Test Model
MAX3209E
±15kV ESD-Protected, 12V, Dual RS-232 Serial Port
with Low-Power Standby for Motherboards/Desktops
Machine ModelThe Machine Model for ESD testing uses a 200pF stor-
age capacitor and zero-discharge resistance. It mimics
the stress caused by handling during manufacturing
and assembly. Of course, all pins (not just RS-232
inputs and outputs) require this protection during man-
ufacturing. Therefore, the Machine Model is less rele-
vant to the I/O ports than are the Human Body Model
and IEC 1000-4-2.
Applications Information
R5 and R10 Active in Standby ModeThe MAX3209E is placed in standby mode when VDDis
not present, provided that VSTBYremains at +3V to
+5.5V. In standby mode, receivers R5 and R10 remain
active, consuming 100μA max while unloaded. Standby
mode allows activity to be sensed on the serial ports so
that main power can be restored by the power-man-
agement unit, as shown in Figure 4.
Layout ConsiderationsUse proper layout to ensure other devices on your
board are not damaged in an ESD strike. Currents as
high as 60A can instantaneously pass into ground, so
be sure to minimize the ground-lead return path to the
power supply. A separate return path to the power sup-
ply is recommend. Trace widths should be greater than
40 mils. Bypass VDDand VSTBYwith 0.1μF capacitors
as close to the part as possible to ensure maximum
ESD protection.
The MAX3209E is not sensitive to power-supply
sequencing, and therefore requires no external protec-
tion diodes.
Interconnection with 3V and 5V LogicThe MAX3209E can directly interface with various 3V
and 5V logic families, including ACT and HCT CMOS.
See Table 1 for more information on possible combina-
tions of interconnections.
Mouse DriveabilityThe MAX3209E has been specifically designed to
power serial mice while operating from low-voltage
power supplies. It has been tested with leading mouse
brands from manufacturers such as Microsoft and
Logitech. The MAX3209E successfully drove all serial
mice tested and met their respective current and volt-
age requirements.
