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MAX3386ECUP+-MAX3386ECUP+T-MAX3386EEUP+-MAX3386EEUP+T
3.0V, ±15kV ESD-Protected RS-232 Transceivers 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 ±25kV 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 Enhanced ESD Protection on Rx Inputs and Tx
Outputs
±15kV—Human Body Model
±25kV—IEC 1000-4-2, Air-Gap Discharge
±8kV—IEC 1000-4-2, Contact DischargeLow 300µA Supply Current Guaranteed 250kbps Data Rate 1µA Low-Power ShutdownMeets EIA/TIA-232 Specifications Down to 3.0V
MAX3386E
3.0V, ±25kV ESD-Protected RS-232 ransceiver for PDAs and Cell PhonesSHDN
VCC
GND
T1OUTC2+
C1-
C1+
TOP VIEW
T2OUT
T3OUT
R1IN
R2INT2IN
T1IN
C2-
R1OUTR2OUT
T3IN
TSSOPMAX3386E
MAX3386E
R2OUT10
R1OUT
R2IN13
GND
RS-232
OUTPUTS
TTL/CMOS
INPUTST2IN8
T1IN7
C2-5
C2+4
C1-3
C1+1
R1IN14
T2OUT16
T1OUT1762VCCVL
12 19
C1
0.1μF
C2
0.1μF
CBYPASS
+3.3V
T3IN9T3OUT15
RS-232
INPUTS
TTL/CMOS
OUTPUTS
5kΩ
5kΩ
0.1μF
0.1μF
20
SHDN
Typical Operating Circuit19-1529; Rev 3; 4/01
PARTMAX3386ECUP
MAX3386EEUP-40°C to +85°C
0°C to +70°C
TEMP. RANGEPIN-PACKAGE20 TSSOP
20 TSSOP
Pin Configuration
Ordering Information
IOUT= -1mA
MAX3386E
3.0V, ±25kV ESD-Protected RS-232 ransceiver 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, 10s).................................+300°C
IOUT= 1.6mA
R_OUT, receivers disabled
T_IN, SHDN
T_IN, SHDN
SHDN= GND, all inputs at VCCor GND
SHDN= VCC, no load
CONDITIONS0.4Output Voltage Low±0.05±10Output Leakage Currents±0.01±1Input Leakage Current0.5Transmitter Input Hysteresis
Input Logic Threshold High1.4
110µAShutdown Supply Current 0.31Supply Current
UNITSMINTYPMAXSYMBOLPARAMETER= 5.0V= 3.3V= 2.5V= 1.8V
IOUT= -1mAVVL- VL-
0.60.1Output Voltage High= 3.3V or 5.0VT_IN, SHDN0.6Input Logic Threshold LowVL= 2.5V-25+25Input Voltage Range= +25°CV0.81.2Input Threshold Low0.61.5= 5.0V= 3.3V= +25°CV1.82.4Input Threshold High1.52.4= 5.0V= 3.3V0.5Input Hysteresis
DC CHARACTERISTICS(VCC= +3.3V or +5V, TA= +25°C)
LOGIC INPUTS
RECEIVER OUTPUTS
RECEIVER INPUTS
MAX3386E
3.0V, ±25kV 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.)
IEC 1000-4-2 Air-Gap Discharge method
Human Body Model
VT_OUT= ±12V, transmitters disabled;
VCC= 0 or 3.0V to 5.5V
VT_OUT= 0
VCC= V+ = V- = 0, transmitter output = ±2V
All transmitter outputs loaded with 3kΩto
ground
CONDITIONS±25
±15±25Output Leakage Current±60Output Short-Circuit Current30010MOutput Resistance±5±5.4Output Voltage Swing
UNITSMINTYPMAXSYMBOLPARAMETER= 3kΩ, CL= 1000pF,
one transmitter switching
(Note 2)
VT_OUT> 3.7V
Receiver input to receiver output, = 150pF
CONDITIONS63050tPHL- tPLHReceiver Skew100tPHL- tPLHTransmitter Skew100Time to Exit Shutdown200Receiver Output Disable Time200Receiver Output Enable Time0.15tPLHReceiver Propagation Delay
kbps250Maximum Data Rate
0.15tPHL
UNITSMINTYPMAXSYMBOLPARAMETERIEC 1000-4-2 Contact Discharge method
R_IN, T_OUT
ESD Protection
VCC= 3.3V,= +25°C,= 3kΩto 7kΩ,
measured from +3V
to -3V or -3V to +3V
V/µs
Transition-Region Slew
Rate= 150pF to
1000pF= 150pF to
2500pF
Note 2:Transmitter skew is measured at the transmitter zero crosspoint.
RECEIVER INPUTSTRANSMITTER OUTPUTS
ESD PROTECTION
MAX3386E
3.0V, ±25kV ESD-Protected RS-232 ransceiver for PDAs and Cell Phones
Typical Operating Characteristics(VCC= VL= +3.3V, TA = +25°C, unless otherwise noted.)
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3386E toc 01
LOAD CAPACITANCE (pF)
OUTPUT VOLTAGE (V)
DATA RATE = 250kbps
LOAD = 3kΩ IN PARALLEL WITH CL10002000300040005000
SLEW RATE vs. LOAD CAPACITANCEMAX3386E toc 02
LOAD CAPACITANCE (pF)
SLEW RATE (V/µs)
SLEW RATE +
SLEW RATE -
TRANSMITTER OUTPUT VOLTAGE
vs. DATA RATE
MAX3386E toc 03
DATA RATE (kbps)
OUTPUT VOLTAGE (V)
LOAD = 3kΩ, 1000pF
ONE TRANSMITTER
SWITCHING AT DATA
RATE, OTHER
TRANSMITTERS
AT 1/8 DATA RATE10002000300040005000
SUPPLY CURRENT vs. LOAD CAPACITANCEMAX3386E toc 04
LOAD CAPACITANCE (pF)
SUPPLY CURRENT (mA)
250kbps
120kbps
20kbps
LOAD = 3kΩ,
ONE TRANSMITTER
SWITCHING AT DATA
RATE, OTHER
TRANSMITTERS
AT 1/8 DATA RATE
MAX3386E
3.0V, ±25kV ESD-Protected RS-232 ransceiver for PDAs and Cell PhonesC1+Positive Terminal of the Voltage-Doubler Charge-Pump Capacitor
Pin DescriptionV++5.5V Supply Generated by the Charge PumpC1-Negative Terminal of the Voltage-Doubler Charge-Pump CapacitorC2+Positive Terminal of the Inverting Charge-Pump CapacitorC2-Negative Terminal of the Inverting Charge-Pump CapacitorV--5.5V Generated by the Charge PumpT1INT2INT3IN
TTL/CMOS Transmitter InputsR2OUTR1OUTVLLogic-Level Supply. All CMOS inputs and outputs are referenced to this supply.R2INR1INT3OUTT2OUTT1OUT
RS-232 Transmitter OutputsGNDGroundVCC+3.0V to +5.5V Supply VoltageSHDNShutdown Input. 0 = shutdown, 1 = normal operation.
NAMEFUNCTIONPINTTL/CMOS Receiver Outputs. Swing between 0 and VL.
RS-232 Receiver Inputs
MAX3386E
3.0V, ±25kV ESD-Protected RS-232 ransceiver 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).
MAX3386E
I/O
CHIP
WITH
UART
CPU
RS-232
POWER-
MANAGEMENT
UNIT OR
KEYBOARD
CONTROLLER
SHDN
VCC
I/O CHIP
POWER SUPPLY
Figure 1. Interface Under Control of PMU
LapLink is a trademark of Traveling Software.
50μs/div
5V/div
2V/div
VCC = 3.3V
C1–C4 = 0.1μF
Figure 2. Transmitter Outputs when Exiting Shutdown
Table 1. Shutdown Logic Truth Table
TRANSMITTER
OUTPUTSInactiveLHigh-Z
CHARGE
PUMPActiveHActiveActive
High-Z
SHDN
RECEIVER
OUTPUTS
