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MAX3388ECUG+-MAX3388ECUG+T-MAX3388EEUG+-MAX3389ECUG+-MAX3389ECUG-T
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, andenhanced 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/Opins are active for the MAX3389E. An internal 62Ωswitch is
provided to switch power to external circuitry or modules.
A proprietary low-dropout transmitter output stageenables 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 whilemaintaining 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 PhonesSHDN
VCC
GND
T1OUTC2+
C1-
C1+
TOP VIEW
T2OUT
T3OUT
R1IN
R2INT2IN
T1IN
C2-
LIN
SWIN
R1OUTR2OUT
SWOUT
LOUT
T3IN
TSSOPMAX3388E
MAX3389E
Typical Operating Circuit19-1845; Rev 1; 9/01
Pin Configuration
Ordering Information
PARTTEMP. RANGEPIN-PACKAGE
MAX3388ECUG0°C to +70°C24 TSSOP
MAX3388EEUG-40°C to +85°C24 TSSOP
MAX3389ECUG0°C to +70°C24 TSSOP
MAX3389EEUG-40°C to +85°C24 TSSOP
MAX3388E
MAX3389E
R2OUT12
R1OUT
R2IN
GND
RS-232
I/O
T2IN8
T1IN7
C2-5
C2+4
C1-3
C1+1
R1IN
T2OUT
T1OUT62VCCVL
14 23
C1
0.1μF
C2
0.1μF
CBYPASS
+2.5V
T3IN9T3OUT
5kΩ
5kΩ
0.1μF
0.1μF
24
SHDN
SWIN15
LIN
30kΩSWOUT
SHDNLOUT
= ±15kV ESD PROTECTION
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
PARAMETERSYMBOLShutdown Supply Current
Supply Current
Input Logic Low
Input Logic High
Transmitter Input Hysteresis
Input Leakage Current
Output Leakage Current
Output Voltage Low
Output Voltage High
Input Voltage Range
Input Threshold Low
Input Threshold High
Input Hysteresis
Input ResistanceTA= +25°C
IOUT= -1mA
IOUT= 1.6mA
R_OUT, SHDN =0= +2.5V= +2.5V
SHDN= VCC, no load
SHDN= GND, all inputs at GND
CONDITIONSMINTYPMAXUNITS
0.6V
1.5V
0.4V±0.01±1±0.05±10
0.4V- VL-
0.60.13V
-25+25V
0.61.1V1.82.4
All transmitter outputs loaded with 3kΩto
groundOutput Voltage Swing±3.7±4.2
Output ResistanceVCC= 0, transmitter output = ±2VΩ30010M
Output Short-Circuit CurrentVT_OUT= 0mA±60
DC CHARACTERISTICS(VCC= +2.5V, TA= +25°C)
LOGIC INPUTS (T_IN, SHDN)
RECEIVER OUTPUTS
RECEIVER INPUTS
TRANSMITTER OUTPUTS= +25°C, VL= +2.5V= +25°C, VL= +2.5V
MAX3388E/MAX3389E
2.5V, ±15kV ESD-Protected RS-232 ransceivers for PDAs and Cell Phones
TIMING 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.)
tPHL- tPLH
Note 2:Guaranteed by correlation.
Note 3:Transmitter skew is measured at the transmitter zero crosspoint.
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.)
PARAMETERMaximum Data Rate
Receiver Propagation Delay
Receiver Output Enable Time
Receiver Output Disable Time
Time to Exit Shutdown
Transmitter Skew
Receiver Skew
Transition-Region Slew
Rate
tPHL- tPLH
tPLH
tPHL
SYMBOLCONDITIONS= 3kΩ, CL= 1000pF,
one transmitter switching
Receiver input to receiver output, = 150pF
VT_OUT> 3.7V= 3kΩ, CL= 1000pF (Note 3)
VCC= +2.5V, TA= +25°C,= 3kΩto 7kΩ,
measured from +3V
to -3V or -3V to +3V,
one transmitter switching= 150pF to
1000pF= 150pF to
2500pF430
MINTYPMAXUNITS
kbps
V/µs
PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITSOutput Leakage CurrentVT_OUT = ±12V, transmitters disabled,
VCC = 0 or +2.5V±25µA
HANDSHAKING I/O (LIN, LOUT)Input Voltage Range0VCCV
Input Threshold LowLIN, VL = +2.5V, TA = +25°C0.61.1V
Input Threshold HighLIN, VL = +2.5V, TA = +25°C1.72V
Input Hysteresis0.6V
Input ResistanceTA = +25oC2040kΩ
Output Voltage LowLOUT, ISINK = 1.6mA0.4V
Output Leakage CurrentLOUT = VL, LIN = low or float±10µA
SWITCH (SWIN, SWOUT)Input Voltage Range0VCCV
On-Resistance62100Ω
Off-Leakage CurrentSHDN = 0±1µA
Turn-On Time0.18µs
Turn-Off Time0.7µs
ESD PROTECTIONHuman Body Model±15
IEC 1000-4-2 Air-Gap Discharge method±15R_IN, T_OUT, LIN, SWIN
ESD ProtectionIEC 1000-4-2 Contact Discharge method±8= 3kΩ, CL= 150pF,
one transmitter switching (Note 2)460
tPHL- tPLH
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.)
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3388E toc01
LOAD CAPACITANCE (pF)
OUTPUT VOLTAGE (V)
DATA RATE = 460kbps
LOAD = 3kΩ IN PARALLEL10002000300040005000
SLEW RATE vs. LOAD CAPACITANCEMAX3386E toc02
LOAD CAPACITANCE (pF)
SLEW RATE (V/
SLEW RATE +
SLEW RATE -
TRANSMITTER OUTPUT VOLTAGE
vs. DATA RATE
MAX3388E toc03
DATA RATE (kbps)
OUTPUT VOLTAGE (V)
LOAD = 3kΩ, 1000pF
ONE TRANSMITTER SWITCHING
AT DATA RATE, OTHER
TRANSMITTERS AT 1/8
DATA RATE20001000300040005000
SUPPLY CURRENT
vs. LOAD CAPACITANCEMAX3388E toc04
LOAD CAPACITANCE (pF)
SUPPLY CURRENT (mA)
LOAD = 3kΩ
ONE TRANSMITTER SWITCHING
AT DATA RATE, OTHER
TRANSMITTERS AT 1/8
DATA RATE460kbps
240kbps
20kbps
LIN TO LOUT tPDMAX3388E toc05
200ns/div
RPULLUP = 1kΩ
LOUT
1V/div
LIN1.00.51.52.02.5
ON-RESISTANCE
vs. SWIN VOLTAGEMAX3388E toc06
VSWIN (V)
TA = +85°C
TA = +25°C
TA = -40°C
MAX3388E/MAX3389E
2.5V, ±15kV ESD-Protected RS-232 ransceivers for PDAs and Cell Phones
Pin Description
PINNAMEFUNCTIONC1+Positive Terminal of the Voltage-Doubler Charge-Pump CapacitorV++4.2V 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--4.2V Supply Generated by the Charge Pump
7, 8, 9T1IN,
T2IN, T3INCMOS Transmitter InputsLOUTHandshaking Output. This output is active during shutdown for the MAX3389E.SWOUTSwitch Output
12, 13R2OUT,
R1OUTCMOS Receiver Outputs. Swing between 0 and VL.VLLogic-Level Supply. All CMOS inputs and outputs are referred to this supply. VL = +1.8V to +3.0V.SWINSwitch Input.LINHandshaking Input. This input is active during shutdown for the MAX3389E.
17, 18R2IN,
R1INRS-232 Receiver Inputs
19, 20, 21
T3OUT,
T2OUT,
T1OUT
RS-232 Transmitter OutputsGNDGroundVCC+2.35V to +3V Supply VoltageSHDNShutdown Input. 0 = shutdown, switch open; 1 = normal operation, switch closed.
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
MAX3388E
MAX3389E
I/O
CHIP
WITH
UART
CPU
RS-232
POWER-
MANAGEMENT
UNIT OR
KEYBOARD
CONTROLLER
SHDNI/O CHIP
POWER SUPPLY
Figure 1. Interface Under Control of PMU
10μs/div
5V/div
2V/div
VCC = +2.5V
C1–C4 = 0.1μF
CL = 1000pF, RL = 3kΩ
Figure 2. Transmitter Outputs when Exiting Shutdown
Table 1. Shutdown Logic Truth Table
LOUTSHDN
T R AN SM IT T ERU TPU T S
RECEIVER
OUTPUTS
CH ARG E
PU M PSWIT C H MAX3388EMAX3389EHigh-ZHigh-ZInactiveOpenHigh-ZLINActiveActiveActiveClosedLINLIN
