MAX202E ,±15kV ESD-Protected, +5V RS-232 TransceiversFeaturesThe MAX202E-MAX213E, MAX232E, and MAX241E are a• Saves Board Spacefamily of RS-232 and V.28 ..
MAX202ECPE ,【15kV ESD-Protected, +5V RS-232 TransceiversMAX202E–MAX213E, MAX232E/MAX241E19-0175; Rev 5; 10/03±15kV ESD-Protected, +5V RS-232 Transceivers
MAX202ECPE+ ,±15kV ESD-Protected, +5V RS-232 TransceiversElectrical Characteristics(V = +5V ±10% for MAX202E/206E/208E/211E/213E/232E/241E; V = +5V ±5% for ..
MAX202ECSE ,【15kV ESD-Protected, +5V RS-232 Transceiversfeatures are outlined in thePackage)Selector Guide. The drivers and receivers for all tendevices me ..
MAX202ECSE+ ,±15kV ESD-Protected, +5V RS-232 TransceiversGeneral Description Benefits and
MAX202ECSE+T ,±15kV ESD-Protected, +5V RS-232 TransceiversGeneral Description Benefits and
MAX506BCWP ,Quad 8-Bit DACs with Rail-to-Rail Voltage OutputsGeneral Description
The MAX505 and MAX506 are CMOS, quad, 8-bit voltage-
output digital-to-anal ..
MAX506BCWP+ ,Quad, 8-Bit DAC with Rail-to-Rail OutputsFeatures
. Opennefrom Single +5VS|pplyor Duaieivsupphse
. Output Buffer Amplifiers Swing Rail-to- ..
MAX506BEWP ,Quad 8-Bit DACs with Rail-to-Rail Voltage OutputsELECTRICAL CHARACTERISTICS
(VDD = +5V 110%, Vss = 0V to -5.5V, AGND = DGND = 0V, VREF = 4V, RL = ..
MAX506BEWP+ ,Quad, 8-Bit DAC with Rail-to-Rail OutputsGeneral Description
The MAX505 and MAX506 are CMOS, quad, 8-bit voltage-
output digital-to-anal ..
MAX5070AASA ,5 V, high-performance, single-ended, current-mode PWM controllerFeaturesThe MAX5070/MAX5071 BiCMOS, high-performance,♦ Pin-for-Pin Replacement for UC2842 (MAX5070A ..
MAX5070AAUA ,5 V, high-performance, single-ended, current-mode PWM controllerfeaturesand UC2844 (MAX5070B)required for wide input voltage range isolated/nonisolated♦ 2A Drive S ..
MAX202E-MAX232E
±15kV ESD-Protected, +5V RS-232 Transceivers
MAX202E–MAX213E,
MAX232E/MAX241E
±15kV ESD-Protected,
5V RS-232 Transceivers EVALUATION KIT AVAILABLE
General DescriptionThe MAX202E-MAX213E, MAX232E, and MAX241E are a
family of RS-232 and V.28 transceivers with high ±15kV
ESD HBM protection and integrated charge pump circuit-
ry for single +5V supply operation. The various combina-
tions of features are outlined in the Selector Guide.The
drivers and receivers for all ten devices meet all EIA/TIA-
232E and CCITT V.28 specifications at data rates up to
120kbps when loaded.
The MAX211E/MAX213E/MAX241E are available in 28-
pin SO and SSOP packages. The MAX202E/MAX232E
come in 16-pin TSSOP, narrow SO, wide SO, and DIP
packages. The MAX203E comes in a 20-pin DIP/SO
package, and needs no external charge-pump capaci-
tors. The MAX205E comes in a 24-pin wide DIP pack-
age, and also eliminates external charge-pump
capacitors.
ApplicationsBattery-Powered Equipment
Hand-Held Equipment
Portable Diagnostics Equipment
Benefits and FeaturesSaves Board SpaceIntegrated High ±15kV HBM ESD Protection Integrated Charge Pump Circuitry
Eliminates the Need for a Bipolar ±12V Supply
Enables Single Supply Operation From +5V SupplyIntegrated 0.1µF Capacitors (MAX203E, MAX205E)24 pin SSOP Package Saves up to 40% Versus SO
Package
Saves Power for Reduced Power Requirements1µA Shutdown Mode15µA Shutdown Mode for MAX213E
Pin Configurations and Typical Operating Circuits appear at
end of data sheet.Yes
PARTNO. OF RS-232
DRIVERS
NO. OF RS-232
RECEIVERS
RECEIVERS
ACTIVE IN
SHUTDOWN
NO. OF
EXTERNAL
CAPACITORS
(µF)
LOW-POWER
SHUTDOWN
TTL TRI-
STATE
MAX202E2204 (0.1)NoNo
MAX203E220NoneNoNo
MAX205E550NoneYesYes
MAX206E4304 (0.1)YesYes
MAX207E5304 (0.1)NoNo
MAX208E4404 (0.1)NoNo
MAX211E4504 (0.1)YesYes
MAX213E4524 (0.1)YesYes
MAX232E2204 (1)NoNo
MAX241E4504 (1)Yes
AutoShutdown and UCSP are trademarks of Maxim Integrated
Products, Inc.
Ordering Information 16 Narrow SO0°C to +70°CMAX202ECSE
0°C to +70°C
MAX202ECPE
PIN-PACKAGETEMP RANGEPART16 Plastic DIP
Ordering Information continued at end of data sheet.
MAX202E–MAX213E,
MAX232E/MAX241E
±15kV ESD-Protected,
5V RS-232 Transceivers
Absolute Maximum RatingsVCC..........................................................................-0.3V to +6V
V+................................................................(VCC- 0.3V) to +14V
V-............................................................................-14V to +0.3V
Input Voltages
T_IN............................................................-0.3V to (V+ + 0.3V)
R_IN...................................................................................±30V
Output Voltages
T_OUT.................................................(V- - 0.3V) to (V+ + 0.3V)
R_OUT......................................................-0.3V to (VCC+ 0.3V)
Short-Circuit Duration, T_OUT....................................Continuous
Continuous Power Dissipation (TA= +70°C)
16-Pin Plastic DIP (derate 10.53mW/°C above +70°C)....842mW
16-Pin Narrow SO (derate 8.70mW/°C above +70°C).....696mW
16-Pin Wide SO (derate 9.52mW/°C above +70°C)......762mW
16-Pin TSSOP (derate 9.4mW/°C above +70°C)...........755mW
20-Pin Plastic DIP (derate 11.11mW/°C above +70°C)...889mW
20-Pin SO (derate 10.00mW/°C above +70°C).............800mW
24-Pin Narrow Plastic DIP
(derate 13.33mW/°C above +70°C) ...............................1.07W
24-Pin Wide Plastic DIP
(derate 14.29mW/°C above +70°C)................................1.14W
24-Pin SO (derate 11.76mW/°C above +70°C).............941mW
24-Pin SSOP (derate 8.00mW/°C above +70°C)..........640mW
28-Pin SO (derate 12.50mW/°C above +70°C)....................1W
28-Pin SSOP (derate 9.52mW/°C above +70°C)..........762mW
Operating Temperature Ranges
MAX2_ _EC_ _.....................................................0°C to +70°C
MAX2_ _EE_ _...................................................-40°C to +85°C
Storage Temperature Range.............................-65°C to +165°C
Lead Temperature (soldering, 10s).................................+300°C
Electrical Characteristics(VCC= +5V ±10% for MAX202E/206E/208E/211E/213E/232E/241E; VCC= +5V ±5% for MAX203E/205E/207E; C1–C4 = 0.1µF for
MAX202E/206E/207E/208E/211E/213E; C1–C4 = 1µF for MAX232E/241E; TA= TMINto TMAX; unless otherwise noted. Typical values
are at 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.
R_OUT; IOUT= -1.0mAV3.5VCC - 0.4Output-Voltage HighVOH= VCC, EN = 0V, 0V ≤ ROUT≤ VCC,
MAX205E–208E/211E/213E/241E outputs disabledµA±0.05±10Output Leakage Current
R_OUT; IOUT= 3.2mA (MAX202E/203E/232E) or
IOUT= 1.6mA (MAX205E/208E/211E/213E/241E)V0.4Output-Voltage LowVOL
T_IN; EN, SHDN(MAX213E) or
EN, SHDN (MAX205E–208E/211E/241E)V0.8Input Threshold LowVIL
T_IN = 0V (MAX205E–208E/211E/213E/241E)µA15200Input Pullup Current
PARAMETERCONDITIONSSYMBOLUNITSMINTYPMAXVCCSupply CurrentICCmA20
No load, TA= +25°C1420
MAX211E/213E
MAX232E
715MAX241E
MAX205E–208E
EN, SHDN(MAX213E) or EN, SHDN
(MAX205E–208E/211E/241E)2.4
T_IN
Input Threshold HighVIH
MAX205E/206E110
110MAX211E/241E
T_IN = 0V to VCC(MAX202E/203E/232E)µA±10Input Leakage Current
MAX202E/203E50MAX213E
DC CHARACTERISTICS
LOGICShutdown Supply CurrentTA= +25°C, Figure 1µA
MAX202E–MAX213E,
MAX232E/MAX241E
±15kV ESD-Protected,
5V RS-232 Transceivers
Electrical Characteristics (continued)(VCC= +5V ±10% for MAX202E/206E/208E/211E/213E/232E/241E; VCC= +5V ±5% for MAX203E/205E/207E; C1–C4 = 0.1µF for
MAX202E/206E/207E/208E/211E/213E; C1–C4 = 1µF for MAX232E/241E; TA= TMINto TMAX; unless otherwise noted. Typical values
are at TA= +25°C.)
Note 1:MAX211EE_ _ and MAX213EE_ _ tested with VCC= +5V ±5%.
MAX205E/206E/211E/213E/241E normal opera-
tion, Figure 2
MAX205E/206E/211E/213E/241E normal opera-
tion, Figure 2= 150pF= 3kΩto 7kΩ, CL= 50pF to 1000pF,
one transmitter switching
All drivers loaded with 3kΩto ground (Note 1)= +25°C, VCC= 5V
VCC= 5V, no hysteresis in shutdown= +25°C,
VCC= 5V= +25°C,
VCC= 5V
VCC= V+ = V- = 0V, VOUT= ±2V
CONDITIONS200Receiver Output Disable Time600Receiver Output Enable Time440
tPLHR,
tPHLRReceiver Propagation Delay
kbps120Maximum Data Rate±10±60Output Short-Circuit Current300Output Resistance-3030Input Voltage Range±5±9Output Voltage Swing357Input Resistance0.20.51.0Input HysteresisInput Threshold Low
1.72.41.52.4Input Threshold High
UNITSMINTYPMAXSYMBOLPARAMETERAll parts, normal operation
All parts, normal operation
MAX213E (R4, R5),
SHDN= 0V, EN = VCC= 3kΩ, CL= 2500pF, all transmitters loadedµs2tPLHT,
tPHLTTransmitter Propagation Delay= +25°C, VCC= 5V, RL= 3kΩto 7kΩ, = 50pF to 1000pF, measured from -3V to
+3V or +3V to -3V, Figure 3
V/µs3630Transition-Region Slew Rate
Human Body Model±15
IEC1000-4-2, Air-Gap Discharge
±15
ESD-Protection VoltageIEC1000-4-2, Contact Discharge±8
All parts, normal operation
MAX213E (R4, R5),
SHDN= 0V, EN = VCC
ESD PERFORMANCE: TRANSMITTER OUTPUTS, RECEIVER INPUTS
TIMING CHARACTERISTICS
EIA/TIA-232E TRANSMITTER OUTPUTS
EIA/TIA-232E RECEIVER INPUTS
MAX213E, SHDN= 0V,
EN = VCC0.61.5
Note 1:MAX211EE_ _ tested with VCC= +5V ±5%.
MAX202E–MAX213E,
MAX232E/MAX241E
±15kV ESD-Protected,
5V RS-232 Transceivers
Typical Operating CharacteristicsMAX232E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX202E-TOC1
LOAD CAPACITANCE (pF)
, -V
(V)
VCC = 5.5V
ALL TRANSMITTERS LOADED
DATA RATE = 120kbps
RL = 3kΩ
VCC = 4.5V
VCC = 5.0V
MAX202E/MAX203E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX202E-TOC2
LOAD CAPACITANCE (pF)
, -V
(V)
VCC = 5.5V
VCC = 4.5V
VCC = 5.0V
ALL TRANSMITTERS LOADED
DATA RATE = 120kbps
RL = 3kΩ
MAX241E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX202E-TOC3
LOAD CAPACITANCE (pF)
, -V
(V)
VCC = 4.5V
VCC = 5.5V
VCC = 5.0V
ALL TRANSMITTERS LOADED
DATA RATE = 120kbps
RL = 3kΩ
MAX211E/MAX213E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX202E-TOC4
LOAD CAPACITANCE (pF)
, -V
(V)
VCC = 4.5V
VCC = 5.5V
VCC = 5.0V
ALL TRANSMITTERS LOADED
DATA RATE = 120kbps
RL = 3kΩ
MAX211E/MAX213E/MAX241E
TRANSMITTER SLEW RATE
vs. LOAD CAPACITANCEMAX202E-TOC5
LOAD CAPACITANCE (pF)
SLEW RATE ( V/
+SLEW RATE
-SLEW RATE
ALL TRANSMITTERS LOADED
DATA RATE = 120kbps
RL = 3kΩ
MAX202E–MAX213E,
MAX232E/MAX241E
±15kV ESD-Protected,
5V RS-232 Transceivers
Typical Operating Characteristics (continued)
MAX202E/MAX203E/MAX232E
TRANSMITTER SLEW RATE
vs. LOAD CAPACITANCEMAX202E-TOC6
LOAD CAPACITANCE (pF)
SLEW RATE ( V/
+SLEW RATE
-SLEW RATE
ALL TRANSMITTERS LOADED
DATA RATE = 120kbps
RL = 3kΩ5.0
MAX205E–MAX208E
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX202E TOC-07
LOAD CAPACITANCE (pF)
OUTPUT VOLTAGE (V)
VCC = +4.5V, RL = 3kΩ
1 TRANSMITTER AT FULL DATA RATE
4 TRANSMITTERS AT 1/8 DATA RATE
240kbps
240kbps
120kbps
120kbps
20kbps
20kbps3000
MAX205E–MAX208E
SUPPLY CURRENT
vs. LOAD CAPACITANCEMAX202E TOC-09
LOAD CAPACITANCE (pF)
SUPPLY CURRENT (mA)
VCC = +4.5V, RL = 3kΩ
1 TRANSMITTER AT FULL DATA RATE
4 TRANSMITTERS AT 1/8 DATA RATE
240kbps
120kbps
20kbps3000
MAX205E–MAX208E
TRANSMITTER SLEW RATE
vs. LOAD CAPACITANCEMAX202E TOC-08
LOAD CAPACITANCE (pF)
SLEW RATE (V/
VCC = +4.5V, RL = 3kΩ
1 TRANSMITTER AT FULL DATA RATE
4 TRANSMITTERS AT 1/8 DATA RATE
FALL
RISE
MAX205E–MAX208E
OUTPUT VOLTAGE vs. DATA RATE
MAX202E TOC-10
DATA RATE (kbps)
OUTPUT VOLTAGE (V)1202401503090210
VCC = +4.5V, RL = 3kΩ
1 TRANSMITTER AT FULL DATA RATE
4 TRANSMITTERS AT 1/8 DATA RATE
VOUT+
VOUT-
MAX202E–MAX213E,
MAX232E/MAX241E
±15kV ESD-Protected,
5V RS-232 Transceivers
MAX203E
MAX205E
Pin Descriptions
MAX202E/MAX232E10, 11
9, 12
8, 13
Ground19
RS-232 Driver Inputs13, 14
7, 14
4, 5
RS-232 Receiver Outputs12, 15
RS-232 Receiver Inputs10, 17
RS-232 Driver Outputs9, 18
-2VCCVoltage Generated by the Charge Pump8
1, 3
Terminals for Negative Charge-Pump Capacitor5, 7
+2VCCVoltage Generated by the Charge Pump3
+4.5V to +5.5V Supply-Voltage Input
Terminals for Positive Charge-Pump Capacitor2, 416
GND
T_IN
R_OUT
R_IN
T_OUT
C2+, C2-
C1+, C1-
VCC
N.C.No Connection—Not Internally Connected1, 6, 11, 16__
FUNCTIONNAMEPIN
DIP/SO/TSSOPLCC11, 1512, 15Connect pins together.C2+
NAME8+2VCCVoltage Generated by the Charge PumpV+
C1-
T_IN
R_OUT
R_IN
T_OUT
GND
VCC
C1+
C2-
FUNCTION1, 2RS-232 Driver Inputs
Make no connection to this pin.
3, 20RS-232 Receiver Outputs
4, 19RS-232 Receiver Inputs
1, 2
3, 20
5, 18RS-232 Transmitter Outputs
6, 9Ground+4.5V to +5.5V Supply-Voltage InputMake no connection to this pin.
4,19
5,18
6, 9
11, 16Connect pins together.
10, 17-2VCCVoltage Generated by the Charge Pump. Connect pins together.
10, 16
12, 17
DIP
PIN
NAMEFUNCTIONT_OUTRS-232 Driver Outputs
R_INRS-232 Receiver Inputs
R_OUTTTL/CMOS Receiver Outputs. All receivers are inactive in shutdown.
PIN1–4, 19
5, 10, 13, 18, 24
T_INTTL/CMOS Driver Inputs. Internal pullups to VCC.
GNDGround
VCC+4.75V to +5.25V Supply VoltageReceiver Enable—Active Low
6, 9, 14, 17, 23
7, 8, 15, 16, 22
SHDNShutdown Control—Active High21
MAX202E–MAX213E,
MAX232E/MAX241E
±15kV ESD-Protected,
5V RS-232 Transceivers
MAX208E
Pin Descriptions (continued)
MAX206E
MAX207E
NAMEFUNCTION+2VCCGenerated by the Charge Pump
T_OUTRS-232 Driver Outputs
R_INRS-232 Receiver Inputs
R_OUTTTL/CMOS Receiver Outputs. All receivers are inactive in shutdown.
PIN1, 2, 3, 24
4, 16, 23
T_INTTL/CMOS Driver Inputs. Internal pullups to VCC.
GNDGround
VCC+4.5V to +5.5V Supply Voltage
C1+, C1-Terminals for Positive Charge-Pump Capacitor
5, 17, 22
6, 7, 18, 19
10, 12Receiver Enable—Active Low20
C2+, C2-Terminals for Negative Charge-Pump Capacitor-2VCCGenerated by the Charge Pump
13, 14
SHDNShutdown Control—Active High21
NAMEFUNCTION+2VCCGenerated by the Charge Pump
T_OUTRS-232 Driver Outputs
R_INRS-232 Receiver Inputs
R_OUTTTL/CMOS Receiver Outputs. All receivers are inactive in shutdown.
PIN1, 2, 3, 20, 24
4, 16, 23
T_INTTL/CMOS Driver Inputs. Internal pullups to VCC.
GNDGround
C2+, C2-
VCC+4.75V to +5.25V Supply Voltage
Terminals for Negative Charge-Pump Capacitor
C1+, C1-Terminals for Positive Charge-Pump Capacitor
5, 17, 22
6, 7, 18, 19, 21-2VCCGenerated by the Charge Pump
13, 14
10, 12
NAMEFUNCTION+2VCCGenerated by the Charge Pump
T_OUTRS-232 Driver Outputs
R_INRS-232 Receiver Inputs
R_OUTTTL/CMOS Receiver Outputs. All receivers are inactive in shutdown.
PIN1, 2, 20, 24
3, 7, 16, 23
T_INTTL/CMOS Driver Inputs. Internal pullups to VCC.
GNDGround
C2+, C2-
VCC+4.5V to +5.5V Supply Voltage
Terminals for Negative Charge-Pump Capacitor
C1+, C1-Terminals for Positive Charge-Pump Capacitor
4, 6, 17, 22
5, 18, 19, 21-2VCCGenerated by the Charge Pump
13, 14
10, 12
MAX202E–MAX213E,
MAX232E/MAX241E
±15kV ESD-Protected,
5V RS-232 Transceivers
V+
GND
MAX206E
MAX211E
MAX213E
MAX241E
0.1µF*
VCC
0.1µF*
R1 TO R5
T1 TO T5
0.1µF*
C1+
C1-
C2+
C2-
VCC
+5.5VT_OUT
R_OUT
400kΩ
5kΩ
ISHDN
0V OR +5.5V
DRIVE
0.1µF*
0.1µF*
3kΩ
+5.5VR_IN
T_IN
CAPACITORS MAY BE
POLARIZED OR UNPOLARIZED
( ) ARE FOR MAX213E
* 1µF FOR MAX241E
EN (EN)
SHDN (SHDN)+5.5V (0V)
V-
+5.5V
Figure 1. Shutdown-Current Test Circuit (MAX206E,
MAX211E/MAX213E/MAX241E)
+3.5V
INPUT
OUTPUT ENABLE TIME
+2.5V
RECEIVER
OUTPUT
CL = 150pF
RECEIVER
OUTPUTS
OUTPUT DISABLE TIME
VOH - 0.1VVOH
VOL
VOL + 0.1V
RL = 1kΩ
NOTE:POLARITY OF EN
IS REVERSED
FOR THE
MAX213E
+0.8V
+3V
+3V
INPUT
Figure 2. Receiver Output Enable and Disable Timing
(MAX205E/MAX206E/MAX211E/MAX213E/MAX241E)
NAMEFUNCTIONT_OUTRS-232 Driver Outputs
-2VCCVoltage Generated by the Charge Pump
R_INRS-232 Receiver Inputs
R_OUTTTL/CMOS Receiver Outputs. For the MAX213E, receivers R4 and R5 are active in shutdown
mode when EN = 1. For the MAX211E and MAX241E, all receivers are inactive in shutdown.
PIN1, 2, 3, 28
4, 9, 18, 23, 27
T_INTTL/CMOS Driver Inputs. Only the MAX211E, MAX213E, and MAX241E have internal pullups to VCC.
Receiver Enable—Active High (MAX213E)
GNDGround
VCC+4.5V to +5.5V Supply Voltage
SHDN
C1+, C1-Terminals for Positive Charge-Pump Capacitor
5, 8, 19, 22, 26
6, 7, 20, 21
Shutdown Control—Active Low (MAX213E)+2VCCVoltage Generated by the Charge Pump
C2+, C2-Terminals for Negative Charge-Pump Capacitor
12, 14
15, 16Receiver Enable—Active Low (MAX211E, MAX241E)
SHDNShutdown Control—Active High (MAX211E, MAX241E)
Pin Descriptions (continued)
MAX211E/MAX213E/MAX241E
MAX202E–MAX213E,
MAX232E/MAX241E
±15kV ESD-Protected,
5V RS-232 Transceivers
V+
MAX2_ _E
0.1µF*
VCC
0.1µF*
0.1µF*
C1+
C1-
C2+
C2-
VCC
T_OUT
R_OUT
EN (EN)
SHDN (SHDN)
400kΩ
5kΩ
0.1µF*
0.1µF*
3kΩ
+5V
R_IN
T_IN
MINIMUM SLEW-RATE TEST CIRCUIT
0V (+5V)
0V (+5V)
2500pF
V-
V+
0.1µF*
VCC
0.1µF*
R_
0.1µF*
C1+
C1-
C2+
C2-
VCC
T_OUT
R_OUT
EN (EN)
SHDN (SHDN)
400kΩ
5kΩ
0.1µF*
0.1µF*
7kΩ
+5V
R_IN
T_IN
MAXIMUM SLEW-RATE TEST CIRCUIT
0V (+5V)
0V (+5V)
50pF
V-
( ) ARE FOR MAX213E
* 1µF FOR MAX232E/MAX241E
MAX2_ _E
TRANSMITTER INPUT PULL-UP RESISTORS, ENABLE, AND SHUTDOWN ARE NOT PROVIDED ON THE MAX202E, MAX203E, AND MAX232E.
ENABLE AND SHUTDOWN ARE NOT PROVIDED ON THE MAX207E AND MAX208E.
Figure 3. Transition Slew-Rate Circuit
Detailed DescriptionThe MAX202E–MAX213E, MAX232E/MAX241E consist of
three sections: charge-pump voltage converters, dri-
vers (transmitters), and receivers. These E versions
provide extra protection against ESD. They survive
±15kV dischargesto the RS-232 inputs andoutputs,
testedusingthe Human Body Model. When tested
according to IEC1000-4-2, they survive ±8kV contact-
discharges and ±15kV air-gap discharges. The rugged
E versions are intended for use in harsh environments
or applications where the RS-232 connection is fre-
quently changed (such as notebook computers). The
standard (non-“E”) MAX202, MAX203, MAX205–
MAX208, MAX211, MAX213, MAX232, and MAX241 are
recommended for applications where cost is critical.
+5V to ±10V Dual Charge-Pump
Voltage ConverterThe +5V to ±10V conversion is performed by dual
charge-pump voltage converters (Figure 4). The first
charge-pump converter uses capacitor C1 to double
the +5V into +10V, storing the +10V on the output filter
into -10V, storing the -10V on the V- output filter capaci-
tor, C4.
In shutdown mode, V+ is internally connected to VCCby
a 1kΩpull-down resistor, and V- is internally connected
to ground by a 1kΩpull up resistor.
RS-232 DriversWith VCC= 5V, the typical driver output voltage swing
is ±8V when loaded with a nominal 5kΩRS-232 receiv-
er. The output swing is guaranteed to meet EIA/TIA-
232E and V.28 specifications that call for ±5V minimum
output levels under worst-case conditions. These
include a 3kΩload, minimum VCC, and maximum oper-
ating temperature. The open-circuit output voltage
swings from (V+ - 0.6V) to V-.
Input thresholds are CMOS/TTL compatible. The
unused drivers’ inputs on the MAX205E–MAX208E,
MAX211E, MAX213E, and MAX241E can be left uncon-
nected because 400kΩpull up resistors to VCCare
included on-chip. Since all drivers invert, the pull up
resistors force the unused drivers’ outputs low. The
MAX202E, MAX203E, and MAX232E do not have pull
up resistors on the transmitter inputs.
MAX202E–MAX213E,
MAX232E/MAX241E
±15kV ESD-Protected,
5V RS-232 Transceivers
When in low-power shutdown mode, the MAX205E/
MAX206E/MAX211E/MAX213E/MAX241E driver outputs
are turned off and draw only leakage currents—even if
they are back-driven with voltages between 0V and
12V. Below -0.5V in shutdown, the transmitter output is
diode-clamped to ground with a 1kΩseries imped-
ance.
RS-232 ReceiversThe receivers convert the RS-232 signals to CMOS-logic
output levels. The guaranteed 0.8V and 2.4V receiver
input thresholds are significantly tighter than the ±3V
thresholds required by the EIA/TIA-232E specification.
This allows the receiver inputs torespond to TTL/CMOS-
logic levels, as well as RS-232 levels.
The guaranteed 0.8V input low threshold ensures that
receivers shorted to ground have a logic 1 output. The
5kΩinput resistance to ground ensures that a receiver
with its input left open will also have a logic 1 output.
Receiver inputs have approximately 0.5V hysteresis.
This provides clean output transitions, even with slow
rise/fall-time signals with moderate amounts of noise
and ringing.
In shutdown, the MAX213E’s R4 and R5 receivers have
no hysteresis.
Shutdown and Enable Control
(MAX205E/MAX206E/MAX211E/
MAX213E/MAX241E)In shutdown mode, the charge pumps are turned off,
V+ is pulled down to VCC, V- is pulled to ground, and
the transmitter outputs are disabled. This reduces sup-
ply current typically to 1µA (15µA for the MAX213E).
The time required to exit shutdown is under 1ms, as
shown in Figure 5.
ReceiversAll MAX213E receivers, except R4 and R5, are put into
a high-impedance state in shutdown mode (see Tables
1a and 1b). The MAX213E’s R4 and R5 receivers still
function in shutdown mode. These two awake-in-shut-
down receivers can monitor external activity while main-
taining minimal power consumption.
The enable control is used to put the receiver outputs into
a high-impedance state, to allow wire-OR connection of
two EIA/TIA-232E ports (or ports of different types) at the
UART. It has no effect on the RS-232 drivers or the
charge pumps.
Note: The enable control pin is active low for the
MAX211E/MAX241E (EN), but is active high for the
MAX213E (EN). The shutdown control pin is active high
C1-
IL-RL-
V -
fCLKS5S6C3C2IL +RL +S4S7S8
C1+
GND
GND
VCC
VCC
C2-
C2+
PARTfCLK
(kHz)MAX202E
MAX211E/213E
MAX232E
MAX203E230
MAX205E–208E200
MAX241E30
Figure 4. Charge-Pump Diagram
MAX202E–MAX213E,
MAX232E/MAX241E
±15kV ESD-Protected,
5V RS-232 Transceivers
200μs/div
10V
-5V
-10V
SHDN
MAX211EFigure 5. MAX211E V+ and V- when Exiting Shutdown (0.1µF
capacitors)
X = Don't care.
*Active = active with reduced performance
SHDNEENN
OPERATION
STATUSTxRx0Normal
OperationAll ActiveAll Active1Normal
OperationAll ActiveAll High-ZXShutdownAll High-ZAll High-Z
Table 1a. MAX205E/MAX206E/MAX211E/
MAX241E Control Pin Configurations
Table 1b. MAX213E Control Pin
Configurationsfor the MAX205E/MAX206E/MAX211E/MAX241E
(SHDN), but is active low for the MAX213E (SHDN).
The MAX213E’s receiver propagation delay is typically
0.5µs in normal operation. In shutdown mode, propaga-
tion delay increases to 4µs for both rising and falling
transitions. The MAX213E’s receiver inputs have
approximately 0.5V hysteresis, except in shutdown,
when receivers R4 and R5 have no hysteresis.
When entering shutdown with receivers active, R4 and
R5 are not valid until 80µs after SHDNis driven low.
When coming out of shutdown, all receiver outputs are
invalid until the charge pumps reach nominal voltage
levels (less than 2ms when using 0.1µF capacitors).
±15kV ESD ProtectionAs with all Maxim devices, ESD-protection structures
are incorporated on all pins to protect against electro-
static discharges encountered during handling and
assembly. The driver outputs and receiver inputs have
extra protection against static electricity. Maxim’s engi-
neers developed state-of-the-art structures to protect
these pins against ESD of ±15kV without damage. The
ESD structures withstand high ESD in all states: normal
operation, shutdown, and powered down. After an ESD
event, Maxim’s Eversions keep working without latchup,
whereas competing RS-232 products can latch and
must be powered down to remove latchup.
ESD protection can be tested in various ways; the
transmitter outputs and receiver inputs of this product
family are characterized for protection to the following
limits:±15kV using the Human Body Model±8kV using the contact-discharge method specified
in IEC1000-4-2±15kV using IEC1000-4-2’s air-gap method.
ESD Test ConditionsESD performance depends on a variety of conditions.
Contact Maxim for a reliability report that documents
test set-up, test methodology, and test results.
Human Body ModelFigure 6a shows the Human Body Model, and Figure
6b shows the current waveform it generates when dis-
charged into a low impedance. This model consists of
a 100pF capacitor charged to the ESD voltage of inter-SHHDDNN
ENOPERATION
STATUSTx 1–40ShutdownAll High-Z1ShutdownAll High-Z0Normal
Operation1Normal
OperationAll Active
All Active
Active
1–34, 5High-Z
Active
High-Z
High-Z
High-Z
Active*
High-Z
MAX202E–MAX213E,
MAX232E/MAX241E
±15kV ESD-Protected,
5V RS-232 Transceivers
est, which is then discharged into the test device
through a 1.5kΩresistor.
IEC1000-4-2
The IEC1000-4-2 standard covers ESD testing and per-
formance of finished equipment; it does not specifically
refer to integrated circuits. The
MAX202E/MAX203E–MAX213E, MAX232E/MAX241E
help you design equipment that meets level 4 (the high-
est level) of IEC1000-4-2, without the need for addition-
al ESD-protection components.
The major difference between tests done using the
Human Body Model and IEC1000-4-2 is higher peak
current in IEC1000-4-2, because series resistance is
lower in the IEC1000-4-2 model. Hence, the ESD with-
stand voltage measured to IEC1000-4-2 is generally
lower than that measured using the Human Body
Model. Figure 7b shows the current waveform for the
8kV IEC1000-4-2 level-four ESD contact-discharge test.
The air-gap test involves approaching the device with a
charged probe. The contact-discharge method con-
nects the probe to the device before the probe is ener-
gized.
Machine Model
The Machine Model for ESD tests all pins using a
200pF storage capacitor and zero discharge resis-
tance. Its objective is to emulate the stress caused by
contact that occurs with handling and assembly during
manufacturing. Of course, all pins require this protec-
tion during manufacturing, not just RS-232 inputs and
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
150pF
RC 50MΩ to 100MΩRD 330Ω
HIGH-
VOLTAGE
SOURCE
DEVICE
UNDER
TEST
Figure 7a. IEC1000-4-2 ESD Test Modeltr = 0.7ns to 1ns
30ns
60ns
100%
90%
10%
IPEAK
Figure 7b. IEC1000-4-2 ESD Generator Current Waveform
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
100pF
RC 1MΩRD 1500Ω
HIGH-
VOLTAGE
SOURCE
DEVICE
UNDER
TEST
Figure 6a. Human Body ESD Test Model
IP 100%
90%
36.8%
tRLTIME
tDL
CURRENT WAVEFORM
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
10%
AMPERES
Figure 6b. Human Body Model Current Waveform
MAX202E–MAX213E,
MAX232E/MAX241E
±15kV ESD-Protected,
5V RS-232 Transceivers
outputs. Therefore,after PC board assembly,the
Machine Model is less relevant to I/O ports.
Applications Information
Capacitor Selection
The capacitor type used for C1–C4 is not critical for
proper operation. The MAX202E, MAX206–MAX208E,
MAX211E, and MAX213E require 0.1µF capacitors,
and the MAX232E and MAX241E require 1µF capaci-
tors, although in all cases capacitors up to 10µF can
be used without harm. Ceramic, aluminum-electrolytic,
or tantalum capacitors are suggested for the 1µF
capacitors, and ceramic dielectrics are suggested for
the 0.1µF capacitors. When using the minimum recom-
mended capacitor values, make sure the capacitance
value does not degrade excessively as the operating
temperature varies. If in doubt, use capacitors with a
larger (e.g., 2x) nominal value. The capacitors’ effec-
tive series resistance (ESR), which usually rises at low
temperatures, influences the amount of ripple on V+
and V-.
Use larger capacitors (up to 10µF) to reduce the output
impedance at V+ and V-. This can be useful when
“stealing” power from V+ or from V-. The MAX203E and
MAX205E have internal charge-pump capacitors.
Bypass VCCto ground with at least 0.1µF. In applica-
tions sensitive to power-supply noise generated by the
charge pumps, decouple VCCto ground with a capaci-
tor the same size as (or larger than) the charge-pump
capacitors (C1–C4).
V+ and V- as Power Supplies
A small amount of power can be drawn from V+ and V-,
although this will reduce both driver output swing and
noise margins. Increasing the value of the charge-pump
capacitors (up to 10µF) helps maintain performance
when power is drawn from V+ or V-.
Driving Multiple Receivers
Each transmitter is designed to drive a single receiver.
Transmitters can be paralleled to drive multiple
receivers.
Driver Outputs when Exiting Shutdown
The driver outputs display no ringing or undesirable
transients as they come out of shutdown.
High Data Rates
These transceivers maintain the RS-232 ±5.0V mini-
mum driver output voltages at data rates of over
120kbps. For data rates above 120kbps, refer to the
Transmitter Output Voltage vs. Load Capacitance
graphs in the Typical Operating Characteristics.
Communication at these high rates is easier if the
capacitive loads on the transmitters are small; i.e.,
short cables are best.
Table 2. Summary of EIA/TIA-232E, V.28 Specifications
PARAMETERCONDITIONSEIA/TIA-232E, V.28 SPECIFICA-
TIONS
0 Level
3kΩto 7kΩload+5V to +15V
Data Rate3kΩ≤RL≤7kΩ, CL≤2500pFUp to 20kbps
+3V to +15V
Instantaneous Slew Rate, Max3kΩ≤RL≤7kΩ, CL≤2500pF30V/µs
Driver Output Short-Circuit Current, Max 100mA
Transition Rate on Driver Output
V.281ms or 3% of the period
Driver Output Resistance-2V < VOUT< +2V300Ω
EIA/TIA-232E4% of the period
Driver Output Level, MaxNo load±25V
Driver Output Voltage
3kΩto 7kΩload-5V to -15V
0 Level
1 Level
1 Level
Receiver Input Level±25V
Receiver Input Voltage
-3V to -15V
