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MAX3186CAP-MAX3186CWP-MAX3186EAP
【15kV ESD-Protected, EMC-Compliant, 230kbps RS-232 Serial Port for Modems
_______________General DescriptionThe MAX3186 is a complete DCE RS-232 serial port
designed to meet the stringent ESD requirements of the
European community. All transmitter outputs and receiv-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.
The MAX3186 has five RS-232 transmitters, three RS-
232 receivers, and no charge pump, optimizing it for
operation in modem applications. It is guaranteed to
run at data rates up to 230kbps, providing compatibility
with popular software for communicating with personal
computers. Power-supply current is less than 300µA for
IDDand ISS, and less than 1mA for ICC.
The MAX3186 is available in an SO package and in the
tiny SSOP that further reduces board space.
________________________ApplicationsModems
ISDN Modems
Instruments
Equipment Meeting IEC1000-4-2
____________________________FeaturesEnhanced ESD Protection:
±15kV—Human Body Model
±8kV—IEC1000-4-2, Contact Discharge
±15kV—IEC1000-4-2, Air-Gap DischargeLatchup Free During an ESD Event20-Pin SSOP or SO PackagesGuaranteed 230kbps Data RateFlow-Through PinoutComplete DCE Serial Port
MAX3186
±15kV ESD-Protected, EMC-Compliant, 230kbps
RS-232 Serial Port for Modems
________________________________________________________________Maxim Integrated Products1
__________________Pin Configuration
__________Typical Operating Circuit19-1077; Rev 0; 9/96
& the latest literature: http://,
MAX3186
±15kV ESD-Protected, EMC-Compliant, 230kbps
RS-232 Serial Port for Modems
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS(VCC= +4.5V to +5.5V, VDD= +10.8V to +13.2V, VSS= -10.8V to -13.2V, 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.
VCC...........................................................................-0.3V to +7V
VDD.........................................................................-0.3V to +14V
VSS..........................................................................+0.3V to -14V
Input Voltages
TIN.........................................................................-0.3V to +6V
RIN....................................................................................±30V
Output Voltages
TOUT..................................................................................±15V
ROUT........................................................-0.3V to (VCC+ 0.3V)
Short-Circuit Duration
TOUT(one at a time)................................................Continuous
ROUT(one at a time)...............................................Continuous
Continuous Power Dissipation (TA= +70°C)
Wide SO (derate 10.00mW/°C above +70°C)...............800mW
SSOP (derate 8.00mW/°C above +70°C).....................640mW
Operating Temperature Ranges
MAX3186C_P.......................................................0°C to +70°C
MAX3186E_P....................................................-40°C to +85°C
Storage Temperature Range ............................-65°C to +160°C
Lead Temperature (soldering, 10sec) ............................+300°C
MAX3186
±15kV ESD-Protected, EMC-Compliant, 230kbps
RS-232 Serial Port for Modems
_______________________________________________________________________________________3
ELECTRICAL CHARACTERISTICS (continued)(VCC= +4.5V to +5.5V, VDD= +10.8V to +13.2V, VSS= -10.8V to -13.2V, TA= TMINto TMAX, unless otherwise noted. Typical values
are at TA= +25°C.)
MAX3186
±15kV ESD-Protected, EMC-Compliant, 230kbps
RS-232 Serial Port for Modems_______________________________________________________________________________________
__________________________________________Typical Operating Characteristics(VCC= +5.0V, VDD= +12.0V, VSS= -12.0V, TA= +25°C, unless otherwise noted.)
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX3186-TOC01
SUPPLY VOLTAGE (V)
SUPPLY CUREENT (mA)
SUPPLY CURRENT
vs. LOAD CAPACITANCE
MAX3186-TOC02
LOAD CAPACITANCE (pF)
SUPPLY CUREENT (mA)
SLEW RATE
vs. LOAD CAPACITANCE
MAX3186-TOC03
LOAD CAPACITANCE (pF)
SLEW RATE (V/
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3186-TOC04
LOAD CAPACITANCE (pF)
TRANSMITTER OUTPUT VOLTAGE (V)
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CURRENT PER TRANSMITTER
MAX3186-TOC05
LOAD CURRENT PER TRANSMITTER (pF)
SLEW RATE (V/
SLEW RATE
vs. TEMPERATURE
MAX3186-TOC06
TEMPERATURE (°C)
SLEW RATE (V/1051254565525-35-15-55
_______________Detailed Description
±15kV ESD ProtectionAs with all Maxim devices, ESD-protection structures
are incorporated on all pins to protect against electro-
static discharges encountered during handling and
assembly. The MAX3186 driver outputs and receiver
inputs have extra protection against static electricity
found in normal operation. Maxim’s engineers devel-
oped state-of-the-art structures to protect these pins
against ESD of ±15kV, without damage. After an ESD
event, the MAX3186 continues working without latchup.
ESD protection can be tested in several ways. The
transmitter outputs and the receiver inputs are charac-
terized for protection to the following:±15kV using the Human Body Model±8kV using the Contact-Discharge Method specified
in IEC1000-4-2 (formerly IEC801-2)±15kV using the Air-Gap Method specified in
IEC1000-4-2 (formerly IEC801-2)
ESD Test ConditionsESD performance depends on a number of conditions.
Contact Maxim for a reliability report that documents
test setup, methodology, and results.
MAX3186
±15kV ESD-Protected, EMC-Compliant, 230kbps
RS-232 Serial Port for Modems5
______________________________________________________________Pin Description
MAX3186
±15kV ESD-Protected, EMC-Compliant, 230kbps
RS-232 Serial Port for Modems_______________________________________________________________________________________
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 inter-
est, which is then discharged into the device through a
1.5kΩresistor.
IEC1000-4-2The IEC1000-4-2 standard covers ESD testing and per-
formance of finished equipment; it does not specifically
refer to integrated circuits. The MAX3186 helps you
design equipment that meets Level 4 (the highest level)
of IEC1000-4-2, without additional ESD-protection com-
ponents.
The main 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 ESD test model (Figure 1a),
the ESD withstand voltage measured to this standard is
generally lower than measured using the Human Body
Model. Figure 1b shows the current waveform for the
±8kV IEC1000-4-2 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.
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 IEC1000-4-2.
__________Applications InformationUse 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 the ground,
so be sure to minimize the ground-lead return path to
the power supply. A separate return path to the power
supply is recommend. Trace widths should be greater
than 40 mils. Bypass VCC, VDD, and VSSwith 0.1µF
capacitors as close to the part as possible to ensure
maximum ESD protection.
Tie any transmitter inputs to GND or VCC. No external
protection diodes are needed because the MAX3186 is
not sensitive to power-supply sequencing.
Figure 2a. Human Body ESD Test Model
Figure 2b. Human Body Model Current Waveform
