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MAX3389ECUG
2.5V / 15kV ESD-Protected RS-232 Transceivers for PDAs and Cell Phones
General DescriptionThe MAX3388E/MAX3389E are 2.5V-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. The
MAX3388E/MAX3389E have 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.
In addition to the traditional RS-232 I/O, these devices have
dedicated logic-level I/O pins for additional device-to-
device handshaking. During shutdown the logic-level I/O
pins are active for the MAX3389E. An internal 62Ωswitch is
provided to switch power to external circuitry or modules.
A proprietary low-dropout transmitter output stage
enables RS-232 compatible performance from a +2.35V
to +3.0V supply with a dual charge pump. The charge
pump requires only four small 0.1µF capacitors for oper-
ation from a +2.5V supply. The MAX3388E/MAX3389E
are capable of running at data rates up to 460kbps while
maintaining RS-232-compatible output levels.
The MAX3388E/MAX3389E have a unique VLpin that
allows interoperation in mixed-logic voltage systems.
Both input and output logic levels are pin programma-
ble through the VLpin. The MAX3388E/MAX3389E are
available in a space-saving TSSOP package.
FeaturesVLPin for Compatibility with Mixed-Voltage
Systems Additional I/O for Hot-Sync Applications±15kV ESD Protection on Rx Inputs, Tx Outputs,
LIN, and SWINLow 300µA Supply Current Guaranteed 460kbps Data Rate 1µA Low-Power ShutdownIntegrated Switch for Powering Remote CircuitryFlow-Through PinoutLOUTActive During Shutdown (MAX3389E)
ApplicationsSubnotebook/Palmtop Computers
PDAs and PDA Cradles
Cell Phone Data Cables
Battery-Powered Equipment
Hand-Held Equipment
Peripherals
MAX3388E/MAX3389E
2.5V, ±15kV ESD-Protected RS-232 ransceivers for PDAs and Cell Phones
Typical Operating Circuit19-1845; Rev 1; 9/01
Pin Configuration
Ordering InformationCovered 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.
MAX3388E/MAX3389E
2.5V, ±15kV ESD-Protected RS-232
Transceivers for PDAs and Cell Phones
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS(VCC= VL= +2.35V to +3.0V, C1–C4 = 0.1µF, TA= TMINto TMAX, unless otherwise noted. Typical values are at VCC= VL= +2.5V,= +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, SHDN,LIN to GND.......................................-0.3V to +6V
R_IN to GND.....................................................................±25V
SWIN to GND...........................................-0.3V to (VCC + 0.3V)
Output Voltages
T_OUT to GND...............................................................±13.2V
R_OUT, SWOUT, LOUT to GND................-0.3V to (VL+ 0.3V)
Short-Circuit Duration T_OUT to GND........................Continuous
Continuous Power Dissipation (TA= +70°C)
24-Pin TSSOP (derate 12.2mW/°C above +70°C)........975mW
Operating Temperature Ranges
MAX338_ECUG...................................................0°C to +70°C
MAX338_EEUG.................................................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
MAX3388E/MAX3389E
2.5V, ±15kV ESD-Protected RS-232 ransceivers for PDAs and Cell Phones(VCC= VL= +2.35V to +3.0V, C1–C4 = 0.1µF, TA= TMINto TMAX, unless otherwise noted. Typical values are at VCC= VL= +2.5V,= +25°C.)
Note 2:Guaranteed by correlation.
DC ELECTRICAL CHARACTERISTICS (continued)(VCC= VL= +2.35V to +3.0V, C1–C4 = 0.1µF, TA= TMINto TMAX, unless otherwise noted. Typical values are at VCC= VL= +2.5V,= +25°C.)
MAX3388E/MAX3389E
2.5V, ±15kV ESD-Protected RS-232
Transceivers for PDAs and Cell Phones
Typical Operating Characteristics(VCC= VL= +2.5V, TA = +25°C, unless otherwise noted.)
MAX3388E/MAX3389E
2.5V, ±15kV ESD-Protected RS-232 ransceivers for PDAs and Cell Phones
MAX3388E/MAX3389E
2.5V, ±15kV ESD-Protected RS-232
Transceivers for PDAs and Cell Phones
Detailed Description
Dual Charge-Pump
Voltage ConverterThe MAX3388E/MAX3389E’s internal power supply
consists of a regulated dual charge pump that provides
output voltages of +4.2V (doubling charge pump) and -
4.2V (inverting charge pump), regardless of the input
voltage(VCC) over a +2.5V to +3.0V range. The charge
pumps operatein a discontinuous mode: if the output
voltages are less than 4.2V, the charge pumps are
enabled; if the output voltages exceed 4.2V, the charge
pumps are disabled. Each charge pump requires flying
capacitors (C1, C2) and reservoir capacitors (C3, C4)
to generate the V+ and V- supplies.
RS-232 TransmittersThe transmitters are inverting level translators that convert
CMOS-logic levels to ±3.7V EIA/TIA-232-compatible
levels.
The MAX3388E/MAX3389E’s transmitters guarantee a
250kbps data rate with loads of 3kΩin parallel with
1000pF and 460kbps data rate with loads of 3kΩin paral-
lel with 150pF. Figure 1 shows a complete system con-
nection.
These RS-232 output stages are turned off (high
impedance) when the devices are in shutdown mode.
When the power is off, the MAX3388E/MAX3389Epermit
the outputsto be driven up to ±12V.
The transmitter inputs do not have pullup resistors.
Connect unused inputs to GND or VL.
RS-232 Receivers The receivers convert RS-232 signals to CMOS-logic
output levels. The MAX3388E/MAX3389E’s receivers
have inverting outputs. The outputs are high imped-
ance in shutdown.
Shutdown ModeSupply current falls to less than 1µA when the
MAX3388E/MAX3389Eare 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, the switch is opened, and the transmitter outputs
are disabled (high impedance). The time required to exit
