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MAX3386ECUP-MAX3386EEUP
3.0V / 15kV ESD-Protected RS-232 Transceiver for PDAs and Cell Phones
General DescriptionThe MAX3386E 3V-powered EIA/TIA-232 and V.28/V.24
is a communications interface with low power require-
ments, high data-rate capabilities, and enhanced elec-
trostatic discharge (ESD) protection. The MAX3386E
has two receivers and three transmitters. All RS-232
inputs and outputs are protected to ±15kV using the
IEC 1000-4-2 Air-Gap Discharge method, ±8kV using the
IEC 1000-4-2 Contact Discharge method, and ±15kV
using the Human Body Model.
A proprietary low-dropout transmitter output stage
enables 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. The MAX3386E is capableof
running at data rates up to 250kbps while maintaining
RS-232 compliant output levels.
The MAX3386E has a unique VLpin that allows interop-
eration in mixed-logic voltage systems. Both input and
output logic levels are pin programmable through thepin. The MAX3386E is available in a space-saving
TSSOP package.
ApplicationsSubnotebook/Palmtop Computers
PDAs and PDA Cradles
Cell Phone Data Cables
Battery-Powered Equipment
Hand-Held Equipment
Peripherals
FeaturesVLPin for Compatibility with Mixed-Voltage
Systems ±15kV ESD Protection on Rx Inputs and Tx OutputsLow 300μA Supply Current Guaranteed 250kbps Data Rate 1μA Low-Power ShutdownMeets EIA/TIA-232 Specifications Down to 3.0V
MAX3386E
3.0V, ±15kV ESD-Protected RS-232 ransceiver for PDAs and Cell Phones
Typical Operating Circuit19-1529; Rev 1; 10/99
Pin Configuration
Ordering Information
MAX3386E
3.0V, ±15kV ESD-Protected RS-232
Transceiver for PDAs and Cell Phones
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS(VCC= VL= +3.0V to +5.5V; C1–C4 = 0.1μF, tested at +3.3V ±10%; C1 = 0.047μF, C2–C4 = 0.33μF, tested at +5.0V ±10%; TA=
TMINto TMAX; unless otherwise noted. Typical values are at VCC= VL= +3.3V, 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.
Note 1:V+ and V- can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.
VCCto GND..............................................................-0.3V to +6Vto GND...................................................-0.3V to (VCC+ 0.3V)
V+ to GND................................................................-0.3V to +7V
V- to GND.................................................................+0.3V to -7V
V+ +‰V-‰(Note 1)..............................................................+13V
Input Voltages
T_IN, SHDNto GND...........................................-0.3V to +6V
R_IN to GND..................................................................±25V
Output Voltages
T_OUT to GND............................................................±13.2V
R_OUT.....................................................-0.3V to (VL+ 0.3V)
Short-Circuit Duration T_OUT to GND........................Continuous
Continuous Power Dissipation (TA= +70°C)
20-Pin TSSOP (derate 7.0mW/°C above +70°C).......559mW
Operating Temperature Ranges
MAX3386ECUP.................................................0°C to +70°C
MAX3386EEUP..............................................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10sec).............................+300°C
MAX3386E
3.0V, ±15kV ESD-Protected RS-232 ransceiver for PDAs and Cell Phones
DC ELECTRICAL CHARACTERISTICS (continued)(VCC= VL= +3.0V to +5.5V; C1–C4 = 0.1μF, tested at +3.3V ±10%; C1 = 0.047μF, C2–C4 = 0.33μF, tested at +5.0V ±10%; TA=
TMINto TMAX; unless otherwise noted. Typical values are at VCC= VL= +3.3V, TA= +25°C.)
TIMING CHARACTERISTICS (VCC= VL= +3V to +5.5V; C1–C4 = 0.1μF, tested at +3.3V ±10%; C1 = 0.047μF, C2–C4 = 0.33μF, tested at +5.0V ±10%; TA= TMIN
to TMAX; unless otherwise noted. Typical values are at VCC= VL= +3.3V, TA= +25°C.)
Note 2:Transmitter skew is measured at the transmitter zero crosspoint.
MAX3386E
3.0V, ±15kV ESD-Protected RS-232
Transceiver for PDAs and Cell Phones
Typical Operating Characteristics(VCC= VL= +3.3V, TA = +25°C, unless otherwise noted.)
MAX3386E
3.0V, ±15kV ESD-Protected RS-232 ransceiver for PDAs and Cell Phones
Pin Description
MAX3386E
3.0V, ±15kV ESD-Protected RS-232
Transceiver for PDAs and Cell Phones
Detailed Description
Dual Charge-Pump
Voltage ConverterThe MAX3386E’s internal power supply consists of a
regulated dual charge pump that provides output volt-
ages of +5.5V (doubling charge pump) and -5.5V
(inverting charge pump), regardless of the input voltage
(VCC) over a +3.0V to +5.5V range. The charge pumps
operatein a discontinuous mode: if the output voltages
are less than 5.5V, the charge pumps are enabled; if
the output voltages exceed 5.5V, the charge pumps are
disabled. Each charge pump requires a flyingcapacitor
(C1, C2) and a reservoir capacitor (C3, C4) to generate
the V+ and V- supplies.
RS-232 TransmittersThe transmitters are inverting level translators that convert
CMOS-logic levels to 5.0V EIA/TIA-232 levels.
The MAX3386E’s 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 paral-
leled to drive multiple receivers or mice. Figure 1 shows a
complete system connection.
These RS-232 output stages are turned off (high
impedance) when the device is in shutdown mode.
When the power is off, the MAX3386E permits the outputs
to be driven up to ±12V.
The transmitter inputs do not have pull-up resistors.
Connect unused inputs to GND or VL.
RS-232 Receivers The receivers convert RS-232 signals to CMOS-logic
output levels. The MAX3386E’s receivers have inverting
three-state outputs, which depend on the shutdown
state of the device.
Shutdown ModeSupply current falls to less than 1μA when the MAX3386E
is placed in shutdown mode (SHDNlogic low). When
shut down, the device’s charge pumps are turned off, V+
decays to VCC, V- is pulled to ground, and the transmitter
outputs are disabled (high impedance). The time
required to exit shutdown is typically 100μs, as shown in
Figure 2. Connect SHDNto VCCif the shutdown mode
is not used. In shutdown mode, the receiver outputs are
high impedance (Table 1).
LapLink is a trademark of Traveling Software.
