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MAX3387ECUG+ |MAX3387ECUGMAXN/a60avai3V, ±15kV ESD-Protected, AutoShutdown Plus RS-232 Transceiver for PDAs and Cell Phones
MAX3387EEUG+ |MAX3387EEUGMAXN/a800avai3V, ±15kV ESD-Protected, AutoShutdown Plus RS-232 Transceiver for PDAs and Cell Phones
MAX3387EEUG+T |MAX3387EEUGTMAXIMN/a4221avai3V, ±15kV ESD-Protected, AutoShutdown Plus RS-232 Transceiver for PDAs and Cell Phones
MAX3387EEUG+T |MAX3387EEUGTN/a2500avai3V, ±15kV ESD-Protected, AutoShutdown Plus RS-232 Transceiver for PDAs and Cell Phones
MAX3387EEUG+T |MAX3387EEUGTMAXIMINTEGRAN/a22835avai3V, ±15kV ESD-Protected, AutoShutdown Plus RS-232 Transceiver for PDAs and Cell Phones
MAX3387EEUG-T |MAX3387EEUGTMAXIMN/a3028avai3V, ±15kV ESD-Protected, AutoShutdown Plus RS-232 Transceiver for PDAs and Cell Phones


MAX3387EEUG+T ,3V, ±15kV ESD-Protected, AutoShutdown Plus RS-232 Transceiver for PDAs and Cell PhonesFeaturesThe MAX3387E 3V powered TIA/EIA-232 and V.28/V.24♦ V Pin for Compatibility with Mixed-Volta ..
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MAX3387ECUG+-MAX3387EEUG+-MAX3387EEUG+T-MAX3387EEUG-T
3V, ±15kV ESD-Protected, AutoShutdown Plus RS-232 Transceiver for PDAs and Cell Phones
General Description
The MAX3387E 3V powered TIA/EIA-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 MAX3387E
has three 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 MAX3387E is capa-
ble of running at data rates up to 250kbps while main-
taining RS-232 compliant output levels.
The MAX3387E 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 MAX3387E is available in a space-saving
TSSOP package.
Applications

Subnotebook/Palmtop Computers
PDAs and PDA Cradles
Cell Phone Data Cables
Battery-Powered Equipment
Hand-Held Equipment
Peripherals
Features
VLPin for Compatibility with Mixed-Voltage
Systems
±15kV ESD Protection on Rx Inputs and Tx OutputsLow 300µA Supply Current Guaranteed 250kbps Data Rate 1µA AutoShutdown Plus™with Receivers ActiveMeets TIA/EIA-232 Specifications Down to 3.0V
MAX3387E, ±15kV ESD-Protected, AutoShutdown Plus
RS-232 Transceiver for PDAs and Cell Phones

C1
0.1μF
C2
0.1μF
MAX3387E
R2OUT13
R1OUT14
R2IN17
GND
RS-232
OUTPUTS
TTL/CMOS
INPUTST2IN8
T1IN7
C2-5
C2+4
C1-3
C1+1
R1IN18
T2OUT20
T1OUT2162VCCVL
0.1μF
23 15CBYPASS
+3.3V
T3IN10T3OUT19
RS-232
INPUTS
TTL/CMOS
OUTPUTS
0.1μF
R3OUT12R3IN16
FORCEOFF
24
INVALID9
FORCEON
Typical Operating Circuit

19-1561; Rev 3; 6/10
Ordering Information

AutoShutdown Plus is a trademark of Maxim Integrated
Products, Inc.
PART

MAX3387ECUG+
MAX3387EEUG+
TEMP. RANGE

0°C to +70°C
-40°C to +85°C
PIN-PACKAGE

24 TSSOP
24 TSSOP
+Denotes a lead(Pb)-free/RoHS-compliant package.
MAX3387E, ±15kV ESD-Protected, AutoShutdown Plus
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%; = 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, FORCEON, FORCEOFFto 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)
24-Pin TSSOP (derate 12.2mW/°C above +70°C)........976mW
Operating Temperature Ranges
MAX3387ECUG...................................................0°C to +70°C
MAX3387EEUG................................................-40°C to +85°C
Junction Temperature......................................................+150°C
Storage Temperature Range.............................-65°C to +150°C
Lead Temperature (soldering, 10s).................................+300°C
Soldering Temperature (reflow).......................................+260°C
IOUT= 1.6mA
All R_IN idle, FORCEON = GND,
FORCEOFF= VCC, all T_IN idle
T_IN, FORCEON, FORCEOFF
T_IN, FORCEON,
FORCEOFF
FORCEOFF= FORCEON = VCC, no load
CONDITIONS
0.4Output Voltage Low±0.01±1Input Leakage Current0.5Transmitter Input Hysteresis
Input Logic Threshold High1.4
2.01.010Supply Current, AutoShutdown
Plus
0.31mASupply Current
UNITSMINTYPMAXSYMBOLPARAMETER
= +5.0V= +3.3V= +2.5V= +1.8V
IOUT= -1mAVVL- VL-
0.60.1Output Voltage High= +3.3V or +5.0VT_IN, FORCEON,
FORCEOFF0.6Input Logic Threshold LowVL= +2.5V-25+25Input Voltage Range= +25°CV0.81.5Input Threshold LowVL= +5.0V= +3.3V0.61.2= +25°CV1.82.4Input Threshold HighVL= +5.0V= +3.3V1.52.4
DC CHARACTERISTICS
(VCC= +3.3V or +5V, TA= +25°C)
LOGIC INPUTS
RECEIVER OUTPUTS
RECEIVER INPUTS
MAX3387E, ±15kV ESD-Protected, AutoShutdown Plus
RS-232 Transceiver 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%; = TMINto TMAX, unless otherwise noted. Typical values are at VCC= VL= +3.3V, TA= +25°C.)
AutoShutdown Plus (FORCEON = GND, FORCEOFF
= VCC)
ESD PROTECTION
TRANSMITTER OUTPUTS

-2.7Negative threshold
Figure 3a
Positive threshold
Receiver or Transmitter Edge to
Transmitters ShutdowntAUTOSHDN153060s
Receiver Positive or Negative
Threshold to INVALIDLowtINVL30
VCC= +5V, Figure 3b
Receiver or Transmitter Edge to
Transmitters EnabledtWU100VCC= +5V, Figure 3bVCC= +5V, Figure 3b
Receiver Positive or Negative
Threshold to INVALIDHightINVH1µs
INVALIDOutput Voltage Low0.4
VCC= +5V, Figure 3b
INVALIDOutput Voltage HighVL- 0.6IOUT= -1.6mAIOUT= -1.0mA
Receiver Input Threshold to
INVALIDOutput Low-0.30.3V
Receiver Input Threshold to
INVALIDOutput High
2.7VFigure 3a
R_IN, T_OUT
ESD Protection
IEC 1000-4-2 Contact Discharge method
PARAMETERSYMBOLMINTYPMAXUNITS

Input Hysteresis0.5V
Input Resistance357kΩ
Output Voltage Swing±5±5.4V
Output Resistance30010MΩ
Output Short-Circuit Current±60mA
Output Leakage Current±25µA
±15
±15
CONDITIONS
= +25°C
All transmitter outputs loaded with 3kΩto
ground
VCC= V+ = V- = 0V, transmitter output = ±2V
VT_OUT= 0V
VT_OUT= ±12V, transmitters disabled;
VCC= 0V or +3.0V to +5.5V
Human Body Model
IEC 1000-4-2 Air-Gap Discharge method
TRANSMITTER OUTPUTS
ESD PROTECTION
AutoShutdown Plus (FORCEON = GND, FORCEOFF
= VCC)
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3387E-01
LOAD CAPACITANCE (pF)
OUTPUT VOLTAGE (V)
DATA RATE = 250kbps
LOAD = 3kΩ IN PARALLEL WITH CL10002000300040005000
SLEW RATE vs. LOAD CAPACITANCE

MAX3387E-02
LOAD CAPACITANCE (pF)
SLEW RATE (V/µs)
SLEW RATE +
SLEW RATE -
Typical Operating Characteristics

(VCC= VL= +3.3V, TA = +25°C, unless otherwise noted.)= 150pF to
1000pF= 150pF to
2500pF
VCC= +3.3V,= +25°C,= 3kΩto 7kΩ,
measured from +3V
to -3V or -3V to +3V= 3kΩ, CL= 1000pF,
one transmitter switching
(Note 2)
V/µs
⏐VT_OUT⏐> +3.7V
Transition-Region Slew
Rate
Receiver input to receiver output, = 150pF
CONDITIONS

63050⏐tPHL- tPLH⏐Receiver Skew100⏐tPHL- tPLH⏐Transmitter Skew100Time to Exit Shutdown0.15tPLHReceiver Propagation Delay
kbps250Maximum Data Rate
0.15tPHL
UNITSMINTYPMAXSYMBOLPARAMETER
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.)
MAX3387E, ±15kV ESD-Protected, AutoShutdown Plus
RS-232 Transceiver for PDAs and Cell Phones
Note 2:
Transmitter skew is measured at the transmitter zero crosspoints.
MAX3387E, ±15kV ESD-Protected, AutoShutdown Plus
RS-232 Transceiver for PDAs and Cell Phones

TRANSMITTER OUTPUT VOLTAGE
vs. DATA RATE
MAX3387E-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 CAPACITANCE

MAX3387E-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
Typical Operating Characteristics (continued)

(VCC= VL= +3.3V, TA = +25°C, unless otherwise noted.)
FORCEOFF
VCC
GND
T1OUTC2+
C1-
C1+
TOP VIEW
T2OUT
T3OUT
R1IN
R2INT2IN
T1IN
C2-
R3IN
R1OUT
R2OUTR3OUT
FORCEON
T3IN
INVALID
TSSOP

MAX3387E
Pin Configuration
MAX3387E, ±15kV ESD-Protected, AutoShutdown Plus
RS-232 Transceiver for PDAs and Cell Phones

C1+Positive Terminal of the Voltage-Doubler Charge-Pump Capacitor
Pin Description
+5.5V Supply Generated by the Charge Pump
C1-Negative Terminal of the Voltage-Doubler Charge-Pump Capacitor
C2+Positive Terminal of the Inverting Charge-Pump Capacitor
C2-Negative Terminal of the Inverting Charge-Pump Capacitor-5.5V Generated by the Charge Pump
T1INTTL/CMOS Transmitter Inputs
R3OUT
TTL/CMOS Receiver Outputs. Swing between 0V and VL.R2OUT
R1OUTLogic-Level Supply. All CMOS inputs and outputs are referenced to this supply.
R3IN
R2IN
R1IN
RS-232 Receiver Inputs
T3OUT
T2OUT
T1OUT
RS-232 Transmitter Outputs
GNDGround
VCC+3.0V to +5.5V Supply Voltage
NAMEFUNCTION

FORCEOFFForce-Off Input. Drive FORCEOFFlow to shut down transmitters and on-board power sup-
ply. This overrides all automatic circuitry and FORCEON (Table 1).
PIN

FORCEONForce-On Input. Drive FORCEON high to override automatic circuitry keeping transmitters
on (FORCEOFFmust be high) (Table 1).11
INVALIDOutput of the Valid Signal Detector. INVALIDis high if a valid RS-232 signal is present on
the receiver inputs.9
T3INTTL/CMOS Transmitter Inputs10T2IN
MAX3387E, ±15kV ESD-Protected, AutoShutdown Plus
RS-232 Transceiver for PDAs and Cell Phones
Detailed Description
Dual Charge-Pump
Voltage Converter

The MAX3387E’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 volt-
age (VCC) over a +3.0V to +5.5V range. The charge
pumps operate in 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 fly-
ing capacitor (C1, C2) and a reservoir capacitor (C3,
C4) to generate the V+ and V- supplies.
RS-232 Transmitters

The transmitters are inverting level translators that con-
vert CMOS-logic levels to 5.0V EIA/TIA-232 levels.
The MAX3387E transmitters guarantee a 250kbps data
rate with worst-case loads of 3kΩin parallel with
1000pF, providing compatibility with PC-to-PC commu-
nication software (such as Laplink®). Transmitters canparalleled to drive multiple receivers or mice. Figure 1
shows a complete system connection.
These RS-232 output stages are turned off (high imped-
ance) when the device is in shutdown mode. When the
power is off, the MAX3387E 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 MAX3387E’s receivers are always
active, even when the device is in shutdown.
The MAX3387E features an INVALIDoutput that indi-
cates when no signal is present on any RS-232 receiver
inputs. INVALIDis independent of other control logic
functions; it indicates the receiver input conditions only
(Figures 2 and 3).
MAX3387E
I/O
CHIP
WITH
UART
CPU
RS-232
POWER-
MANAGEMENT
UNIT OR
KEYBOARD
CONTROLLER
VCC
I/O CHIP
POWER SUPPLY
FORCEOFF
FORCEON
INVALID
Figure 1. Interface Under Control of PMU
Laplink is a registered trademark of Laplink Software, Inc.
+0.3V
-0.3V
INVALID
R_IN
TRANSMITTERS ARE DISABLED, REDUCING SUPPLY CURRENT TO 1μA IF
ALL RECEIVER INPUTS ARE BETWEEN +0.3V AND -0.3V FOR AT LEAST 30μs.
30μs
COUNTER
+2.7V
-2.7V
INVALID
R_IN
TRANSMITTERS ARE ENABLED IF:
ANY RECEIVER INPUT IS GREATER THAN +2.7V OR LESS THAN -2.7V;
ANY RECEIVER INPUT HAS BEEN BETWEEN +0.3V AND -0.3V FOR LESS THAN 30μs.
30μs
COUNTER
Figure 2a. INVALIDFunction Diagram, INVALID= Low
Figure 2b. INVALIDFunction Diagram, INVALID= High
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