MAX232-MAX232A-MAX234-MAX237-MAX238 Fast Delivery |IC PHOENIX CO.,LIMITED

MAX232 ,+5V-Powered, Multichannel RS-232 Drivers/ReceiversGeneral Description Benefits and
MAX2320EUP ,Adjustable / High-Linearity / SiGe Dual-Band LNA/Mixer ICsELECTRICAL CHARACTERISTICS—MAX2320/MAX2321/MAX2326(V = +2.7V to +3.6V, R = R = 20kΩ , no RF signals ..
MAX2321 ,Adjustable, High-Linearity, SiGe, Dual-Band, LNA/Mixer ICsApplicationsCDMA/TDMA/PDC/WCDMA/GSM Cellular Phones Pin ConfigurationsSingle/Dual/Triple-Mode Phone ..
MAX2321EUP ,Adjustable / High-Linearity / SiGe Dual-Band LNA/Mixer ICsfeatures such as an Pin-Selectable Low-Gain Mode Reduces Gain byLO frequency doubler and divider, ..
MAX2323EGI ,Triple/Dual-Mode CDMA LNA/MixersApplications Functional DiagramDual-Band, Triple-Mode PCS/Cellular PhonesTOP VIEWDual-Mode Cellular ..
MAX2323EGI ,Triple/Dual-Mode CDMA LNA/MixersELECTRICAL CHARACTERISTICS(V = +2.7V to +3.6V, R = 20kΩ , R = 24kΩ , T = -40°C to +85°C, no RF appl ..
MAX5363EUT+T ,Low-Cost, Low-Power, 6-Bit DACs with 3-Wire Serial Interface in SOT23ApplicationsMAX5364EUT-T -40°C to +85°C 6 SOT23-6 AADGAutomatic Tuning (VCO)MAX5365EUT-T -40°C to + ..
MAX5363EUT-T ,Low-Cost, Low-Power, 6-Bit DACs with 3-Wire Serial Interface in SOT23ELECTRICAL CHARACTERISTICS(V = +2.7V to +3.6V (MAX5363), V = +4.5V to +5.5V (MAX5364), V = +2.7V to ..
MAX5363EUT-T ,Low-Cost, Low-Power, 6-Bit DACs with 3-Wire Serial Interface in SOT23ApplicationsMAX5364EUT-T -40°C to +85°C 6 SOT23-6 AADGAutomatic Tuning (VCO)MAX5365EUT-T -40°C to + ..
MAX536ACPE ,Calibrated, Quad, 12-Bit Voltage-Output DACs with Serial InterfaceFeatures' Four 12-Bit DACs with Output BuffersThe MAX536/MAX537 combine four 12-bit, voltage-output ..
MAX536ACPE+ ,Calibrated, Quad, 12-Bit Voltage-Output DACs with Serial InterfaceFeatures♦ Four 12-Bit DACs with Output BuffersThe MAX536/MAX537 combine four 12-bit, voltage-output ..
MAX536ACPE+ ,Calibrated, Quad, 12-Bit Voltage-Output DACs with Serial InterfaceApplicationsMAX536ACPE+ 0°C to +70°C 16 PDIP ±0.5Industrial Process ControlsMAX536BCPE+ 0°C to +70° ..

MAX232-MAX232A-MAX234-MAX237-MAX238
+5V-Powered, Multichannel RS-232 Drivers/Receivers
MAX220–MAX249+5V-Powered, Multichannel
RS-232 Drivers/Receivers
General Description
The MAX220–MAX249 family of line drivers/receivers is
intended for all EIA/TIA-232E and V.28/V.24 communica-
tions interfaces, particularly applications where ±12V is
not available.
The MAX225, MAX233, MAX235, and MAX245/MAX246/
MAX247 use no external components and are
recommended for applications where printed circuit
board space is critical.
The MAX220-MAX249 are offered in 26 different pack-
ages with temperatures from 0 to +70°C up to -55°C to
+125°C. See ordering information table at the end of the
data sheet for all package and temperature options.
ApplicationsInterface TranslationMultidrop RS-232 NetworksPortable Diagnostics Equipment
Benefits and Features
Saves Board SpaceIntegrated Charge Pump CircuitryEliminates the Need for a Bipolar ±12V SupplyEnables Single Supply Operation from +5V SupplyIntegrated Capacitors (MAX223, MAX233, MAX235,
MAX245-MAX247)
Saves Power for Reduced Power Requirements5µW Shutdown Mode
AutoShutdown and UCSP are trademarks of Maxim Integrated
Products, Inc.
TOP VIEW
VCC
GND
T1OUT
R1INC2+
C1-
C1++
MAX220
MAX232
MAX232AR1OUT
T1IN
T2IN
R2OUTR2IN
T2OUT
C2-
DIP/SO+10VC1+C1
T1IN
R1OUT
T2IN
R2OUT
T1OUT
R1IN
T2OUT
R2IN
+5V INPUT
C2+-10V
RS-232
OUTPUTS
RS-232
INPUTS
TTL/CMOS
INPUTS
TTL/CMOS
OUTPUTS
GND
5kΩ
5kΩ
400kΩ
400kΩ
+5V
+5V
+10V TO -10V
VOLTAGE INVERTER
+5V TO +10V
VOLTAGE DOUBLER
CAPACITANCE (µF)
DEVICE
MAX220
MAX232
MAX232A
C2-
C1-
VCC
Ordering Information and Selection Table appears at end
of data sheet.
MAX220/MAX232/MAX232A Pin Configuration and Typical Operating Circuit
MAX220–MAX249+5V-Powered, Multichannel
RS-232 Drivers/Receivers
Absolute Maximum Ratings—MAX220/222/232A/233A/242/243
Electrical Characteristics—MAX220/222/232A/233A/242/243
(VCC= +5V ±10%, C1–C4 = 0.1µF‚ MAX220, C1 = 0.047µF, C2–C4 = 0.33µF, TA= TMINto TMAX‚ unless otherwise noted.) (Note 3)
Note 1:For the MAX220, V+ and V- can have a maximum magnitude of 7V, but their absolute difference cannot exceed 13V.
Note 2:Input voltage measured with TOUT in high-impedance state, VSHDNor VCC= 0V.
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.
(Voltages referenced to GND.)
VCC...........................................................................-0.3V to +6V
V+ (Note 1)..................................................(VCC- 0.3V) to +14V
V- (Note 1)..............................................................+0.3V to -14V
Input Voltages
TIN.............................................................-0.3V to (VCC- 0.3V)
RIN(Except MAX220)........................................................±30V
RIN(MAX220)....................................................................±25V
TOUT (Except MAX220) (Note 2)......................................±15V
TOUT(MAX220)..............................................................±13.2V
Output Voltages
TOUT..................................................................................±15V
ROUT........................................................-0.3V to (VCC+ 0.3V)
Driver/Receiver Output Short Circuited to GND.........Continuous
Continuous Power Dissipation (TA= +70°C)
16-Pin Plastic DIP (derate 10.53mW/°C above +70°C)..842mW
18-Pin Plastic DIP (derate 11.11mW/°C above +70°C)..889mW
20-Pin Plastic DIP (derate 8.00mW/°C above +70°C)..440mW
16-Pin Narrow SO (derate 8.70mW/°C above +70°C)...696mW
16-Pin Wide SO (derate 9.52mW/°C above +70°C)......762mW
18-Pin Wide SO (derate 9.52mW/°C above +70°C)......762mW
20-Pin Wide SO (derate 10.00mW/°C above +70°C)....800mW
20-Pin SSOP (derate 8.00mW/°C above +70°C)..........640mW
16-Pin CERDIP (derate 10.00mW/°C above +70°C).....800mW
18-Pin CERDIP (derate 10.53mW/°C above +70°C).....842mW
Operating Temperature Ranges
MAX2_ _AC_ _, MAX2_ _C_ _.............................0°C to +70°C
MAX2_ _AE_ _, MAX2_ _E_ _..........................-40°C to +85°C
MAX2_ _AM_ _, MAX2_ _M_ _.......................-55°C to +125°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10s).................................+300°C
Soldering Temperature (reflow)
20 PDIP (P20M+1).......................................................+225°C
All other lead(Pb)-free packages.................................+260°C
All other packages containing lead(Pb)......................+240°C
PARAMETER CONDITIONS MIN TYP MAX UNITS
RS-232 TRANSMITTERS
Output Voltage Swing All transmitter outputs loaded with 3k to GND ±5 ±8 V
Input Logic-Low Voltage 1.4 0.8 V
All devices except MAX220 2 1.4 Input Logic-High Voltage
MAX220: VCC = +5.0V 2.4
All except MAX220, normal operation 5 40
Logic Pullup/lnput Current VSHDN = 0V, MAX222/MAX242, shutdown,
MAX220 ±0.01 ±1 μA
VCC = +5.5V, VSHDN = 0V, VOUT = ±15V,
MAX222/MAX242 ±0.01 ±10
VOUT = ±15V ±0.01 ±10 Output Leakage Current
VCC = VSHDN = 0V MAX220, VOUT = ±12V ±25
μA
Data Rate 200 116 kbps
Transmitter Output Resistance VCC = V+ = V- = 0V, VOUT = ±2V 300 10M
VOUT = 0V ±7 ±22 Output Short-Circuit Current VOUT = 0V MAX220 ±60 mA
RS-232 RECEIVERS ±30 RS-232 Input Voltage Operating Range MAX220 ±25 V
All except MAX243 R2IN 0.8 1.3 RS-232 Input Threshold Low VCC = +5V MAX243 R2IN (Note 4) -3 V
All except MAX243 R2IN 1.8 2.4 RS-232 Input Threshold High VCC = +5V V
MAX220–MAX249+5V-Powered, Multichannel
RS-232 Drivers/Receivers
Electrical Characteristics—MAX220/222/232A/233A/242/243 (continued)
(VCC= +5V ±10%, C1–C4 = 0.1µF‚ MAX220, C1 = 0.047µF, C2–C4 = 0.33µF, TA= TMINto TMAX‚ unless otherwise noted.) (Note 3)
PARAMETER CONDITIONS MIN TYP MAX UNITS
All except MAX220/MAX243, VCC = +5V, no
hysteresis in shutdown 0.2 0.5 1.0
MAX220 0.3 RS-232 Input Hysteresis
MAX243 1
3 5 7 RS-232 Input Resistance TA = +25°C (MAX220) 3 5 7 k
IOUT = 3.2mA 0.2 0.4 TTL/CMOS Output Voltage Low IOUT = 1.6mA (MAX220) 0.4 V
TTL/CMOS Output Voltage High IOUT = -1.0mA 3.5 VCC - 0.2 V
Sourcing VOUT = VGND -2 -10 TTL/CMOS Output Short-Circuit Current Sinking VOUT = VCC 10 30 mA
TTL/CMOS Output Leakage Current VSHDN = VCC or VEN = VCC (VSHDN = 0V for
MAX222), 0V VOUT VCC ±0.05 ±10 μA
EN Input Threshold Low MAX242 1.4 0.8 V
EN Input Threshold High MAX242 2.0 1.4 V
Supply Voltage Range 4.5 5.5 V
MAX220 0.5 2
No load MAX222/MAX232A/MAX233A/
MAX242/MAX243 4 10
MAX220 12
VCC Supply Current (VSHDN = VCC),
Figures 5, 6, 11, 19
3k load
both inputs MAX222/MAX232A/MAX233A/
MAX242/MAX243 15
mA
TA = +25°C 0.1 10
TA = 0°C to +70°C 2 50
TA = -40°C to +85°C 2 50 Shutdown Supply Current MAX222/
MAX242
TA = -55°C to +125°C 35 100
μA
SHDN Input Leakage Current MAX222/MAX242 ±1 μA
SHDN Threshold Low MAX222/MAX242 1.4 0.8 V
SHDN Threshold High MAX222/MAX242 2.0 1.4 V
MAX222/MAX232A/
MAX233/MAX242/MAX243 6 12 30
Transition Slew Rate
CL = 50pF to 2500pF,
RL = 3k to 7k,
VCC = +5V, TA =
+25°C, measured
from +3V to -3V or
-3V to +3V
MAX220 1.5 3 30.0
V/μs
MAX222/MAX232A/
MAX233/MAX242/MAX243 1.3 3.5 tPHLT, Figure 1
MAX220 4 10
MAX222/MAX232A/
MAX233/MAX242/MAX243 1.5 3.5
Transmitter Propagation Delay TLL to
RS-232 (Normal Operation)
tPLHT, Figure 1
μs
MAX220–MAX249+5V-Powered, Multichannel
RS-232 Drivers/Receivers
Typical Operating Characteristics
MAX220/MAX222/MAX232A/MAX233A/MAX242/MAX243
OUTPUT VOLTAGE vs. LOAD CURRENT
MAX220-01
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
0.1μF
EITHER V+ OR V- LOADED
VCC = +5V
NO LOAD ON
TRANSMITTER OUTPUTS
(EXCEPT MAX220, MAX233A)
V- LOADED, NO LOAD ON V+
V+ LOADED, NO LOAD ON V-
1μF
1μF0.1μF
AVAILABLE OUTPUT CURRENT
vs. DATA RATE
MAX220-02
DATA RATE (kb/s)
OUTPUT CURRENT (mA)3050
OUTPUT LOAD CURRENT
FLOWS FROM V+ TO V-
VCC = +5.25V
ALL CAPS
1μF
ALL CAPS
0.1μFVCC = +4.75V
+10V
-10V
MAX222/MAX242
ON-TIME EXITING SHUTDOWN
+5V
+5V
MAX220-03
500μs/div
V+, V- VOLTAGE (V)
1μF CAPSV+V-
SHDN
0.1μF CAPS
1μF CAPS
0.1μF CAPS
Electrical Characteristics—MAX220/222/232A/233A/242/243 (continued)
(VCC= +5V ±10%, C1–C4 = 0.1µF‚ MAX220, C1 = 0.047µF, C2–C4 = 0.33µF, TA= TMINto TMAX‚ unless otherwise noted.) (Note 3)
PARAMETER CONDITIONS MIN TYP MAX UNITS
MAX222/MAX232A/MAX233/
MAX242/MAX243 0.5 1 tPHLR, Figure 2
MAX220 0.6 3
MAX222/MAX232A/MAX233/
MAX242/MAX243 0.6 1
Receiver Propagation Delay RS-232 to
TLL (Normal Operation)
tPLHR, Figure 2
MAX220 0.8 3
μs
tPHLS, Figure 2 MAX242 0.5 10 Receiver Propagation Delay RS-232 to
TLL (Shutdown) tPHLS, Figure 2 MAX242 2.5 10 μs
Receiver-Output Enable Time tER MAX242, Figure 3 125 500 ns
Receiver-Output Disable Time tDR MAX242, Figure 3 160 500 ns
Transmitter-Output Enable Time
(SHDN Goes High) tET
MAX222/MAX242, 0.1μF
caps (includes charge-pump
start-up), Figure 4
250 μs
Transmitter-Output Disable Time
(SHDN Goes Low) tDTMAX222/MAX242,
0.1μF caps, Figure 4 600 ns
MAX222/MAX232A/MAX233/
MAX242/MAX243 300 Transmitter + to - Propagation Delay
Difference (Normal Operation) tPHLT - tPLHT
MAX220 2000
ns
MAX222/MAX232A/MAX233/
MAX242/MAX243 100 Receiver + to - Propagation Delay
Difference (Normal Operation) tPHLR - tPLHR
MAX220 225
ns
Note 3:All units are production tested at hot. Specifications over temperature are guaranteed by design.
Note 4:MAX243 R2OUT is guaranteed to be low when R2IN ≥0V or is unconnected.
(Voltages referenced to GND.)
VCC...........................................................................-0.3V to +6V
V+................................................................(VCC- 0.3V) to +14V
V-............................................................................+0.3V to -14V
Input Voltages
TIN............................................................-0.3V to (VCC+ 0.3V)
RIN.....................................................................................±30V
Output Voltages
TOUT..................................................(V+ + 0.3V) to (V- - 0.3V)
ROUT........................................................-0.3V to (VCC+ 0.3V)
Short-Circuit Duration, TOUT to GND........................Continuous
Continuous Power Dissipation (TA= +70°C)
14-Pin Plastic DIP (derate 10.00mW/°C above +70°C)....800mW
16-Pin Plastic DIP (derate 10.53mW/°C above +70°C)....842mW
20-Pin Plastic DIP (derate 11.11mW/°C above +70°C)....889mW
24-Pin Narrow Plastic DIP
(derate 13.33mW/°C above +70°C)..........1.07W
24-Pin Plastic DIP (derate 9.09mW/°C above +70°C)......500mW
16-Pin Wide SO (derate 9.52mW/°C above +70°C).........762mW
20-Pin Wide SO (derate 10.00mW/°C above +70°C).......800mW
24-Pin Wide SO (derate 11.76mW/°C above +70°C).......941mW
28-Pin Wide SO (derate 12.50mW/°C above +70°C) .............1W
44-Pin Plastic FP (derate 11.11mW/°C above +70°C).....889mW
14-Pin CERDIP (derate 9.09mW/°C above +70°C)..........727mW
16-Pin CERDIP (derate 10.00mW/°C above +70°C)........800mW
20-Pin CERDIP (derate 11.11mW/°C above +70°C)........889mW
24-Pin Narrow CERDIP
(derate 12.50mW/°C above +70°C)..............1W
24-Pin Sidebraze (derate 20.0mW/°C above +70°C)..........1.6W
28-Pin SSOP (derate 9.52mW/°C above +70°C).............762mW
Operating Temperature Ranges
MAX2 _ _ C _ _......................................................0°C to +70°C
MAX2 _ _ E _ _...................................................-40°C to +85°C
MAX2 _ _ M _ _......................................................-55°C to +125°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering, 10s).................................+300°C
Soldering Temperature (reflow)
20 PDIP (P20M+1).........................................................+225°C
24 PDIP (P24M-1)..........................................................+225°C
All other lead(Pb)-free packages...................................+260°C
All other packages containing lead(Pb)...........................+240°C
MAX220–MAX249+5V-Powered, Multichannel
RS-232 Drivers/Receivers
Absolute Maximum Ratings—MAX223/MAX230–MAX241
Electrical Characteristics—MAX223/MAX230–MAX241
(MAX223/230/232/234/236/237/238/240/241, VCC= +5V ±10%; MAX233/MAX235, VCC= +5V ±5%‚ C1–C4 = 1.0µF;
MAX231/MAX239, VCC= +5V ±10%; V+ = +7.5V to +13.2V; TA= TMINto TMAX; unless otherwise noted.) (Note 5)
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.
CONDITIONSMINTYPMAXUNITS
Output Voltage SwingAll transmitter outputs loaded with 3kΩto ground±5.0±7.3V
VCCSupply CurrentNo load,= +25°C
V+ Supply Current1.85mA515
Shutdown Supply CurrentTA= +25°C1550Input Logic-High Voltage
TIN2.0
EN, SHDN(MAX223);
EN, SHDN (MAX230/235/236/240/241)2.4
Logic Pullup CurrentVTIN =0V1.5200
Receiver Input Voltage
Operating Range-30+30V110Input Logic-Low VoltageTIN, EN, SHDN(MAX233); EN, SHDN (MAX230/235–241)0.8
MAX231/239
MAX223/230/234–238/240/241
MAX232/233
PARAMETER
MAX239
MAX230/235/236/240/241
MAX231
MAX223
MAX220–MAX249+5V-Powered, Multichannel
RS-232 Drivers/Receivers
PARAMETERMINTYPMAXUNITSCONDITIONS
Normal operation
VSHDN= 5V (MAX223)
VSHDN= 0V (MAX235/236/240/241)
RS-232 Input Logic-Low VoltageTA= +25°C,
VCC= +5V
0.61.5RS-232 Input Logic-High VoltageTA= +25°C,
VCC= +5VShutdown (MAX223)
VSHDN= 0V,
VEN= +5V (R4IN‚ R5IN)
Electrical Characteristics—MAX223/MAX230–MAX241 (continued)
(MAX223/230/232/234/236/237/238/240/241, VCC= +5V ±10%; MAX233/MAX235, VCC= +5V ±5%‚ C1–C4 = 1.0µF;
MAX231/MAX239, VCC= +5V ±10%; V+ = +7.5V to +13.2V; TA= TMINto TMAX; unless otherwise noted.) (Note 5)
Shutdown (MAX223)
VSHDN= 0V,
VEN= +5V (R4IN, R5IN)
Normal operation
VSHDN= +5V (MAX223)
VSHDN= 0V (MAX235/236/240/241)
RS-232 Input HysteresisVCC= +5V, no hysteresis in shutdown0.20.51.0V
RS-232 Input ResistanceTA= +25°C, VCC= +5V357kΩ
TTL/CMOS Output Voltage LowIOUT= 1.6mA (MAX231/232/233, IOUT= 3.2mA)0.4V
TTL/CMOS Output Voltage HighIOUT = -1mA3.5VCC- 0.4V
TTL/CMOS Output Leakage Current0V ≤ROUT≤VCC; VEN= 0V (MAX223);
VEN= VCC(MAX235–241)±0.05±10µA
MAX223600nsReceiver Output Enable TimeNormal
operationMAX235/236/239/240/241400
MAX223900nsReceiver Output Disable TimeNormal
operationMAX235/236/239/240/241250
Normal operation0.510VSHDN= 0V
(MAX223)
440Propagation Delay
RS-232 IN to
TTL/CMOS OUT,= 150pF6405.130
V/µs
MAX231/MAX232/MAX233, TA= +25°C, VCC= +5V,= 3kΩto 7kΩ, CL= 50pF to 2500pF, measured from
+3V to -3V or -3V to +3V
Transmitter Output ResistanceVCC= V+ = V- = 0V, VOUT= ±2V300Ω
Transmitter Output Short-Circuit
Current±10mA
tPHLS
tPLHS
Transition Region Slew Rate
MAX223/MAX230/MAX234–241, TA= +25°C, VCC= +5V,= 3kΩto 7kΩ‚ CL= 50pF to 2500pF, measured from
+3V to -3V or -3V to +3V
Note 5:All units are production tested at hot except for the MAX240, which is production tested at TA= +25°C. Specifications over
temperature are guaranteed by design.
MAX220–MAX249+5V-Powered, Multichannel
RS-232 Drivers/Receivers
TRANSMITTER OUTPUT
VOLTAGE (VOH) vs. VCC
MAX220-04
VCC (V)
(V)
1 TRANSMITTER
LOADED3 TRANS-
MITTERS
LOADED
4 TRANSMITTERS
LOADED
2 TRANSMITTERS
LOADED
TA = +25°C
C1–C4 = 1μF
TRANSMITTER
LOADS =
3kΩ || 2500pF
TRANSMITTER OUTPUT VOLTAGE (VOH)
vs. LOAD CAPACITANCE AT
DIFFERENT DATA RATES
MAX220-05
LOAD CAPACITANCE (pF)
(V)
160kb/s
80kb/s
20kb/s
TA = +25°C
VCC = +5V
3 TRANSMITTERS LOADED
RL = 3kΩ
C1–C4 = 1μF
TRANSMITTER SLEW RATE
vs. LOAD CAPACITANCE
MAX220-06
LOAD CAPACITANCE (pF)
SLEW RATE (V/
TA = +25°C
VCC = +5V
LOADED, RL = 3kΩ
C1–C4 = 1μF
1 TRANSMITTER LOADED
2 TRANSMITTERS
LOADED
3 TRANSMITTERS
LOADED
4 TRANSMITTERS
LOADED
TRANSMITTER OUTPUT
VOLTAGE (VOL) vs. VCC
MAX220-07
VCC (V)
(V)
4 TRANS-
MITTERS
LOADED
TA = +25°C
C1–C4 = 1μF
TRANSMITTER
LOADS =
3kΩ || 2500pF
1 TRANS-
MITTER
LOADED
2 TRANS-
MITTERS
LOADED
3 TRANS-
MITTERS
LOADED
TRANSMITTER OUTPUT VOLTAGE (VOL)
vs. LOAD CAPACITANCE AT
DIFFERENT DATA RATES
MAX220-08
LOAD CAPACITANCE (pF)
(V)
-6.8160kb/s
80kb/s
20kb/s
TA = +25°C
VCC = +5V
3 TRANSMITTERS LOADED
RL = 3kΩ
C1–C4 = 1μF
TRANSMITTER OUTPUT VOLTAGE (V+, V-)
vs. LOAD CURRENT
MAX220-09
CURRENT (mA)
V+, V- (V)
V+ AND V-
EQUALLY
LOADED
V- LOADED,
NO LOAD
ON V+
TA = +25°C
VCC = +5V
C1–C4 = 1μF
ALL TRANSMITTERS UNLOADED
V+ LOADED,
NO LOAD
ON V-
Typical Operating Characteristics
MAX223/MAX230–MAX241
V+, V- WHEN EXITING SHUTDOWN
(1μF CAPACITORS)
MAX220-13
VSHDN*
500ms/div
MAX220–MAX249+5V-Powered, Multichannel
RS-232 Drivers/Receivers
Input Logic-Low Voltage
Absolute Maximum Ratings—MAX225/MAX244–MAX249
Electrical Characteristics—MAX225/MAX244–MAX249
(MAX225, VCC= +5.0V ±5%; MAX244–MAX249, VCC= +5.0V ±10%, external capacitors C1–C4 = 1µF; TA= TMINto TMAX; unless
otherwise noted.) (Note 7)
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.
(Voltages referenced to GND.)
Supply Voltage (VCC)...............................................-0.3V to +6V
Input Voltages
TIN‚ ENA, ENB, ENR, ENT, ENRA,
ENRB, ENTA, ENTB..................................-0.3V to (VCC+ 0.3V)
RIN.....................................................................................±25V
TOUT (Note 6)....................................................................±15V
ROUT........................................................-0.3V to (VCC+ 0.3V)
Short Circuit Duration (one output at a time)
TOUT to GND...........................................................Continuous
ROUT to GND...........................................................Continuous
Continuous Power Dissipation (TA= +70°C)
28-Pin Wide SO (derate 12.50mW/°C above +70°C).............1W
40-Pin Plastic DIP (derate 11.11mW/°C above +70°C)...611mW
44-Pin PLCC (derate 13.33mW/°C above +70°C)...........1.07W
Operating Temperature Ranges
MAX225C_ _, MAX24_C_ _ ..................................0°C to +70°C
MAX225E_ _, MAX24_E_ _ ...............................-40°C to +85°C
Storage Temperature Range.............................-65°C to +160°C
Lead Temperature (soldering,10s)).................................+300°C
Soldering Temperature (reflow)
40 PDIP (P40M-2)..........................................................+225°C
All other lead(Pb)-free packages...................................+260°C
All other packages containing lead(Pb)........................+240°C
VCC= 0V,
VOUT= ±15VTables 1a–1d
±0.01±25
Normal operation
Shutdown
Tables 1a–1d, normal operation
All transmitter outputs loaded with 3kΩto GND
VENA, VENB, VENT, VENTA,
VENTB= VCC,VOUT = ±15VRS-232 Input Hysteresis
RS-232 Input Logic-Low VoltageV±5±7.5Output Voltage Swing
Output Leakage Current (Shutdown)
±0.01±2530010MVCC= V+ = V- = 0V, VOUT= ±2V (Note 8)Transmitter Output Resistance
PARAMETER
±0.05±0.10
MINTYPMAXUNITS
Normal operation, outputs disabled,
Tables 1a–1d, 0V ≤VOUT≤VCC, VENR_= VCCTTL/CMOS Output Leakage Current30Sinking VOUT= VCCmA-2-10Sourcing VOUT= VGND3.5VCC- 0.2IOUT= -1.0mATTL/CMOS Output Voltage High0.20.4IOUT= 3.2mATTL/CMOS Output Voltage Low357
0.20.51.0VCC= +5V
1.40.8V
TTL/CMOS Output Short-Circuit Current1.82.4
0.81.3VCC= +5V
RS-232 Input Resistance±25RS-232 Input Voltage Operating Range±7±30VOUT= 0VOutput Short-Circuit Current
kbps12064Data Rate
CONDITIONS
VCC= +5V±0.01±1Logic Pullup/lnput Current1050Tables 1a–1d
RS-232 Input Logic-High Voltage21.4Input Logic-High Voltage
RS-232 TRANSMITTERS
RS-232 RECEIVERS
Note 6:Input voltage measured with transmitter output in a high-impedance state, shutdown, or VCC= 0V.
MAX220–MAX249+5V-Powered, Multichannel
RS-232 Drivers/Receivers
Supply Voltage Range4.755.25V
Transmitter Enable Time
MAX2251020
tET
No loadMAX244–MAX2491130
MAX22540
VCCSupply Current
(Normal Operation)3kΩloads on
all outputsMAX244–MAX24957
Transition Slew Rate
825= 50pF to 2500pF, RL= 3kΩto 7kΩ, VCC= +5V,= +25°C,measured from +3V to -3V or -3V to +3V= TMINto TMAX
CONDITIONS
V/µs
MAX246–MAX249
(excludes charge-pump startup)
Shutdown Supply CurrentµA
tPHLT, Figure 11.33.5
tPLHT, Figure 11.53.5
Transmitter Disable Time
Transmitter Propagation Delay
TLL to RS-232 (Normal Operation)µs
tDT, Figure 4100ns
Transmitter + to - Propagation
Delay Difference (Normal Operation)tPHLT- tPLHT
UNITSMINTYPMAX
PARAMETER
Receiver + to - Propagation
Delay Difference (Normal Operation)tPHLR- tPLHR350ns
4.55.5MAX244–MAX249
MAX225
Leakage current±1
Logic-low voltage1.40.8Control Input
Logic-high voltage2.41.4V= +25°C
tPHLR, Figure 20.61.5
tPLHR, Figure 20.61.5
Receiver Propagation Delay
TLL to RS-232 (Normal Operation)µs
tPHLS, Figure 20.610
tPLHS, Figure 23.010
Receiver Propagation Delay
TLL to RS-232 (Low-Power Mode)µs
Receiver-Output EnableTimetER, Figure 3100500ns
Receiver-Output DisableTimetDR, Figure 3100500ns
MAX225/MAX245–MAX249
(includes charge-pump startup)10ms
POWER SUPPLY AND CONTROL LOGIC
AC CHARACTERISTICS
Note 7:All units production tested at hot. Specifications over temperature are guaranteed by design.
Note 8:The 300Ωminimum specification complies with EIA/TIA-232E, but the actual resistance when in shutdown mode or VCC=
0V is 10MΩas is implied by the leakage specification.
Electrical Characteristics—MAX225/MAX244–MAX249 (continued)
(MAX225, VCC= +5.0V ±5%; MAX244–MAX249, VCC= +5.0V ±10%, external capacitors C1–C4 = 1µF; TA= TMINto TMAX; unless
otherwise noted.) (Note 7)
Typical Operating Characteristics
MAX225/MAX244–MAX2492345
TRANSMITTER SLEW RATE
vs. LOAD CAPACITANCE
MAX220-10
LOAD CAPACITANCE (nF)
TRANSMITTER SLEW RATE (V/
VCC = +5V
EXTERNAL POWER SUPPLY
1μF CAPACITORS
40kb/s DATA RATE
8 TRANSMITTERS
LOADED WITH 3kΩ
OUTPUT VOLTAGE
vs. LOAD CURRENT FOR V+ AND V-
MAX220-11
LOAD CURRENT (mA)
OUTPUT VOLTAGE (V)
V+ AND V- LOADED
EITHER V+ OR
V- LOADED
V+ AND V- LOADED
VCC = +5V
EXTERNAL CHARGE PUMP
1μF CAPACITORS
8 TRANSMITTERS
DRIVING 5kΩ AND
2000pF AT 20kb/s
V- LOADED
V+ LOADED
TRANSMITTER OUTPUT VOLTAGE (V+, V-)
vs. LOAD CAPACITANCE AT
DIFFERENT DATA RATES
MAX220-12
LOAD CAPACITANCE (nF)
V+, V- (V)
VCC = +5V WITH ALL TRANSMITTERS DRIVEN
LOADED WITH 5kΩ
40kb/s
60kb/s
100kb/s
200kb/s
ALL CAPACITIORS 1μF
10kb/s
20kb/s
MAX220–MAX249+5V-Powered, Multichannel
RS-232 Drivers/Receivers
MAX220–MAX249+5V-Powered, Multichannel
RS-232 Drivers/Receivers
INPUT
OUTPUT
+3V
tPLHTtPHLT
tPHLR
tPHLS
tPLHR
tPLHS
50%
VCC
50%
+3V
50%
INPUT
OUTPUT
*EXCEPT FOR R2 ON THE MAX243
WHERE -3V IS USED.
0V*
50%
GND
Figure 1. Transmitter Propagation-Delay TimingFigure 2. Receiver Propagation-Delay Timing
RX IN
a) TEST CIRCUIT
b) ENABLE TIMING
c) DISABLE TIMING
EN INPUT
RECEIVER
OUTPUTS
RX OUT
1kΩ
+3V
+0.8V
+3.5V
OUTPUT ENABLE TIME (tER)
VCC - 2V
VOL + 0.5V
VOH - 0.5V
OUTPUT DISABLE TIME (tDR)
VCC - 2V
+3V
150pF
EN INPUT
VOH
RECEIVER
OUTPUTS
VOL
1 OR 0TX
3kΩ50pF
-5V
+5V
OUTPUT DISABLE TIME (tDT)
SHDN+3V
a) TIMING DIAGRAM
b) TEST CIRCUIT
Figure 3. Receiver-Output Enable and Disable TimingFigure 4. Transmitter-Output Disable Timing
Test Circuits/Timing Diagrams
MAX220–MAX249+5V-Powered, Multichannel
RS-232 Drivers/Receivers
ENTENROPERATION STATUSTRANSMITTERSRECEIVERS0Normal OperationAll ActiveAll Active1Normal OperationAll ActiveAll High-Z0ShutdownAll High-ZAll Low-Power Receive Mode1ShutdownAll High-ZAll High-Z
Table 1a. MAX245 Control Pin Configurations
ENTENROPERATION
STATUS
TRANSMITTERSRECEIVERS
TA1–TA4TB1–TB4RA1–RA5RB1–RB50Normal OperationAll ActiveAll ActiveAll ActiveAll Active1Normal OperationAll ActiveAll ActiveRA1–RA4 High-Z,
RA5 Active
RB1–RB4 High-Z,
RB5 Active0ShutdownAll High-ZAll High-ZAll Low-Power
Receive Mode
All Low-Power
Receive Mode1ShutdownAll High-ZAll High-Z
RA1–RA4 High-Z,
RA5 Low-Power
Receive Mode
RB1–RB4 High-Z,
RB5 Low-Power
Receive Mode
Table 1b. MAX245 Control Pin Configurations
Table 1c. MAX246 Control Pin Configurations
ENAENBOPERATION
STATUS
TRANSMITTERSRECEIVERS
TA1–TA4TB1–TB4RA1–RA5RB1–RB50Normal OperationAll ActiveAll ActiveAll ActiveAll Active1Normal OperationAll ActiveAll High-ZAll ActiveRB1–RB4 High-Z,
RB5 Active0ShutdownAll High-ZAll ActiveRA1–RA4 High-Z,
RA5 ActiveAll Active1ShutdownAll High-ZAll High-Z
RA1–RA4 High-Z,
RA5 Low-Power
Receive Mode
RB1–RB4 High-Z,
RA5 Low-Power
Receive Mode
Control Pin Configuration Tables
MAX220–MAX249+5V-Powered, Multichannel
RS-232 Drivers/Receivers
TA1–TA4TB1–TB4RA1–RA4RB1–RB4000Normal OperationAll ActiveAll ActiveAll ActiveAll Active001Normal OperationAll ActiveAll ActiveAll Active
All High-Z, except
RB5 stays active on
MAX247010Normal OperationAll ActiveAll ActiveAll High-ZAll Active011Normal OperationAll ActiveAll ActiveAll High-Z
All High-Z, except
RB5 stays active on
MAX247100Normal OperationAll ActiveAll High-ZAll ActiveAll Active101Normal OperationAll ActiveAll High-ZAll Active
All High-Z, except
RB5 stays active on
MAX247110Normal OperationAll ActiveAll High-ZAll High-ZAll Active111Normal OperationAll ActiveAll High-ZAll High-Z
All High-Z, except
RB5 stays active on
MAX247000Normal OperationAll High-ZAll ActiveAll ActiveAll Active001Normal OperationAll High-ZAll ActiveAll Active
All High-Z, except
RB5 stays active on
MAX247010Normal OperationAll High-ZAll ActiveAll High-ZAll Active011Normal OperationAll High-ZAll ActiveAll High-Z
All High-Z, except
RB5 stays active on
MAX247100ShutdownAll High-ZAll High-ZLow-Power
Receive Mode
Low-Power
Receive Mode101ShutdownAll High-ZAll High-ZLow-Power
Receive Mode
All High-Z, except
RB5 stays active on
MAX247110ShutdownAll High-ZAll High-ZAll High-ZLow-Power
Receive Mode111ShutdownAll High-ZAll High-ZAll High-Z
All High-Z, except
RB5 stays active on
MAX247
Table 1d. MAX247/MAX248/MAX249 Control Pin Configurations
MAX248
OPERATION
STATUSENRBMAX247TA1–TA4TB1–TB4RA1–RA4RB1–RB5
TRANSMITTERS
ENRAENTBENTA
MAX249TA1–TA3TB1–TB3RA1–RA5RB1–RB5
RECEIVERS
MAX220–MAX249+5V-Powered, Multichannel
RS-232 Drivers/Receivers
Detailed Description
The MAX220–MAX249 contain four sections: dual
charge-pump DC-DC voltage converters, RS-232 dri-
vers, RS-232 receivers, and receiver and transmitter
enable control inputs.
Dual Charge-Pump Voltage Converter
The MAX220–MAX249 have two internal charge-pumps
that convert +5V to ±10V (unloaded) for RS-232 driver
operation. The first converter uses capacitor C1 to dou-
ble the +5V input to +10V on C3 at the V+ output. The
second converter uses capacitor C2 to invert +10V to
-10V on C4 at the V- output.
A small amount of power may be drawn from the +10V
(V+) and -10V (V-) outputs to power external circuitry
(see the Typical Operating Characteristicssection),
except on the MAX225 and MAX245–MAX247, where
these pins are not available. V+ and V- are not regulated,
so the output voltage drops with increasing load current.
Do not load V+ and V- to a point that violates the mini-
mum ±5V EIA/TIA-232E driver output voltage when
sourcing current from V+ and V- to external circuitry.
When using the shutdown feature in the MAX222,
MAX225, MAX230, MAX235, MAX236, MAX240,
MAX241, and MAX245–MAX249, avoid using V+ and V-
to power external circuitry. When these parts are shut
down, V- falls to 0V, and V+ falls to +5V. For applica-
tions where a +10V external supply is applied to the V+
pin (instead of using the internal charge pump to gen-
erate +10V), the C1 capacitor must not be installed and
the SHDNpin must be connected to VCC. This is
because V+ is internally connected to VCCin shutdown
mode.
RS-232 Drivers
The typical driver output voltage swing is ±8V when
loaded with a nominal 5kΩRS-232 receiver and VCC=
+5V. Output swing is guaranteed to meet the EIA/TIA-
232E and V.28 specification, which calls for ±5V mini-
mum driver output levels under worst-case conditions.
These include a minimum 3kΩload, VCC= +4.5V, and
maximum operating temperature. Unloaded driver out-
put voltage ranges from (V+ -1.3V) to (V- +0.5V).
Input thresholds are both TTL and CMOS compatible.
The inputs of unused drivers can be left unconnected
since 400kΩinput pullup resistors to VCCare built in
(except for the MAX220). The pullup resistors force the
outputs of unused drivers low because all drivers invert.
The internal input pullup resistors typically source 12µA,
except in shutdown mode where the pullups are dis-
abled. Driver outputs turn off and enter a high-imped-
ance state—where leakage current is typically
mode, in three-state mode, or when device power is
removed. Outputs can be driven to ±15V. The power-
supply current typically drops to 8µA in shutdown mode.
The MAX220 does not have pullup resistors to force the
outputs of the unused drivers low. Connect unused
inputs to GND or VCC.
The MAX239 has a receiver three-state control line, and
the MAX223, MAX225, MAX235, MAX236, MAX240,
and MAX241 have both a receiver three-state control
line and a low-power shutdown control. Table 2 shows
the effects of the shutdown control and receiver three-
state control on the receiver outputs.
The receiver TTL/CMOS outputs are in a high-imped-
ance, three-state mode whenever the three-state enable
line is high (for the MAX225/MAX235/MAX236/MAX239–
MAX241), and are also high-impedance whenever the
shutdown control line is high.
When in low-power shutdown mode, the driver outputs
are turned off and their leakage current is less than 1µA
with the driver output pulled to ground. The driver output
leakage remains less than 1µA, even if the transmitter
output is backdriven between 0V and (VCC+ 6V). Below
-0.5V, the transmitter is diode clamped to ground with
1kΩseries impedance. The transmitter is also zener
clamped to approximately VCC+ 6V, with a series
impedance of 1kΩ.
The driver output slew rate is limited to less than 30V/µs
as required by the EIA/TIA-232E and V.28 specifica-
tions. Typical slew rates are 24V/µs unloaded and
10V/µs loaded with 3Ωand 2500pF.
RS-232 Receivers
EIA/TIA-232E and V.28 specifications define a voltage
level greater than 3V as a logic 0, so all receivers invert.
Input thresholds are set at 0.8V and 2.4V, so receivers
respond to TTL level inputs as well as EIA/TIA-232E and
V.28 levels.
PARTSHDNENEN(R)RECEIVERS
MAX223__
Low
High
High
Low
High
High Impedance
Active
High Impedance
MAX225____High Impedance
Active__
MAX235
MAX236
MAX240
Low
Low
High__
Low
High
High Impedance
Active
High Impedance
Table 2. Three-State Control of
Receivers
Low
High
SHDN
MAX220–MAX249+5V-Powered, Multichannel
RS-232 Drivers/Receivers
The receiver inputs withstand an input overvoltage up
to ±25V and provide input terminating resistors with
nominal 5kΩvalues. The receivers implement Type 1
interpretation of the fault conditions of V.28 and
EIA/TIA-232E.
The receiver input hysteresis is typically 0.5V with a
guaranteed minimum of 0.2V. This produces clear out-
put transitions with slow-moving input signals, even
with moderate amounts of noise and ringing. The
receiver propagation delay is typically 600ns and is
independent of input swing direction.
Low-Power Receive Mode
The low-power receive mode feature of the MAX223,
MAX242, and MAX245–MAX249 puts the IC into shut-
down mode but still allows it to receive information. This
is important for applications where systems are periodi-
cally awakened to look for activity. Using low-power
receive mode, the system can still receive a signal that
will activate it on command and prepare it for communi-
cation at faster data rates. This operation conserves
system power.
Negative Threshold—MAX243
The MAX243 is pin compatible with the MAX232A, differ-
ing only in that RS-232 cable fault protection is removed
on one of the two receiver inputs. This means that control
lines such as CTS and RTS can either be driven or left
unconnected without interrupting communication.
Different cables are not needed to interface with different
pieces of equipment.
The input threshold of the receiver without cable fault
protection is -0.8V rather than +1.4V. Its output goes
positive only if the input is connected to a control line
that is actively driven negative. If not driven, it defaults
to the 0 or “OK to send” state. Normally‚ the MAX243’s
other receiver (+1.4V threshold) is used for the data line
(TD or RD)‚ while the negative threshold receiver is con-
nected to the control line (DTR‚ DTS‚ CTS‚ RTS, etc.).
Other members of the RS-232 family implement the
optional cable fault protection as specified by EIA/TIA-
232E specifications. This means a receiver output goes
high whenever its input is driven negative‚ left uncon-
nected‚ or shorted to ground. The high output tells the
serial communications IC to stop sending data. To
avoid this‚ the control lines must either be driven or
connected with jumpers to an appropriate positive volt-
age level.
Shutdown—MAX222–MAX242
On the MAX222‚ MAX235‚ MAX236‚ MAX240‚ and
MAX241‚ all receivers are disabled during shutdown.
On the MAX223 and MAX242‚ two receivers continue to
operate in a reduced power mode when the chip is in
shutdown. Under these conditions‚ the propagation
delay increases to about 2.5µs for a high-to-low input
transition. When in shutdown, the receiver acts as a
CMOS inverter with no hysteresis. The MAX223 and
MAX242 also have a receiver output enable input (EN
for the MAX242 and EN for the MAX223) that allows
receiver output control independent of SHDN(SHDN
for MAX241). With all other devices‚ SHDN(SHDN for
MAX241) also disables the receiver outputs.
The MAX225 provides five transmitters and five
receivers‚ while the MAX245 provides ten receivers and
eight transmitters. Both devices have separate receiver
and transmitter-enable controls. The charge pumps
turn off and the devices shut down when a logic high is
applied to the ENT input. In this state, the supply cur-
rent drops to less than 25µA and the receivers continue
to operate in a low-power receive mode. Driver outputs
enter a high-impedance state (three-state mode). On
the MAX225‚ all five receivers are controlled by the
ENRinput. On the MAX245‚ eight of the receiver out-
puts are controlled by the ENRinput‚ while the remain-
ing two receivers (RA5 and RB5) are always active.
RA1–RA4 and RB1–RB4 are put in a three-state mode
when ENRis a logic high.
Receiver and Transmitter Enable
Control Inputs
The MAX225 and MAX245–MAX249 feature transmitter
and receiver enable controls.
The receivers have three modes of operation: full-speed
receive (normal active)‚ three-state (disabled)‚ and low-
power receive (enabled receivers continue to function
at lower data rates). The receiver enable inputs control
the full-speed receive and three-state modes. The
transmitters have two modes of operation: full-speed
transmit (normal active) and three-state (disabled). The
transmitter enable inputs also control the shutdown
mode. The device enters shutdown mode when all
transmitters are disabled. Enabled receivers function in
the low-power receive mode when in shutdown.
MAX220–MAX249+5V-Powered, Multichannel
RS-232 Drivers/Receivers
Tables 1a–1d define the control states. The MAX244
has no control pins and is not included in these tables.
The MAX246 has ten receivers and eight drivers with
two control pins, each controlling one side of the
device. A logic high at the A-side control input (ENA)
causes the four A-side receivers and drivers to go into
a three-state mode. Similarly, the B-side control input
(ENB) causes the four B-side drivers and receivers to
go into a three-state mode. As in the MAX245, one A-
side and one B-side receiver (RA5 and RB5) remain
active at all times. The entire device is put into shut-
down mode when both the A and B sides are disabled
(ENA= ENB= +5V).
The MAX247 provides nine receivers and eight drivers
with four control pins. The ENRAand ENRBreceiver
enable inputs each control four receiver outputs. The
ENTAand ENTBtransmitter enable inputs each control
four drivers. The ninth receiver (RB5) is always active.
The device enters shutdown mode with a logic high on
both ENTAand ENTB.
The MAX248 provides eight receivers and eight drivers
with four control pins. The ENRAand ENRBreceiver
enable inputs each control four receiver outputs. The
ENTAand ENTBtransmitter enable inputs control four
drivers each. This part does not have an always-active
receiver. The device enters shutdown mode and trans-
mitters go into a three-state mode with a logic high on
both ENTAand ENTB.
The MAX249 provides ten receivers and six drivers with
four control pins. The ENRAand ENRBreceiver enable
inputs each control five receiver outputs. The ENTA
and ENTBtransmitter enable inputs control three dri-
vers each. There is no always-active receiver. The
device enters shutdown mode and transmitters go into
a three-state mode with a logic high on both ENTAand
ENTB. In shutdown mode, active receivers operate in a
low-power receive mode at data rates up to 20kb/s.
Applications Information
Figures 5 through 25 show pin configurations and typi-
cal operating circuits. In applications that are sensitive
to power-supply noise, VCCshould be decoupled to
ground with a capacitor of the same value as C1 and
C2 connected as close as possible to the device.
MAX220–MAX249+5V-Powered, Multichannel
RS-232 Drivers/Receivers
TOP VIEW
VCC
GND
T1OUT
R1INC2+
C1-
C1++
MAX220
MAX232
MAX232AR1OUT
T1IN
T2IN
R2OUTR2IN
T2OUT
C2-
DIP/SO+10VC1+C1
T1IN
R1OUT
T2IN
R2OUT
T1OUT
R1IN
T2OUT
R2IN
+5V INPUT
C2+-10V
RS-232
OUTPUTS
RS-232
INPUTS
TTL/CMOS
INPUTS
TTL/CMOS
OUTPUTS
GND
5kΩ
5kΩ
400kΩ
400kΩ
+5V
+5V
+10V TO -10V
VOLTAGE INVERTER
+5V TO +10V
VOLTAGE DOUBLER
CAPACITANCE (µF)
DEVICE
MAX220
MAX232
MAX232A
C2-
C1-
VCC
5kΩ
DIP/SO
SHDN
VCC
GND
T1OUTC1-
C1+
(N.C.) EN
R1IN
R1OUT
T1IN
T2INT2OUT
C2-
C2+9R2OUTR2IN
MAX222
MAX242
SHDN
VCC
GND
T1OUTC1-
C1+
(N.C.) EN
N.C.
R1IN
R1OUT
N.C.T2OUT
C2-
C2+
T1IN
T2INR2OUT
R2IN
MAX222
MAX242
SSOP
( ) ARE FOR MAX222 ONLY.
PIN NUMBERS IN TYPICAL OPERATING CIRCUIT ARE FOR DIP/SO PACKAGES ONLY.+10V
T1IN
R1OUT
T2IN
R2OUT
T1OUT
(EXCEPT MAX220)
(EXCEPT MAX220)
R1IN
T2OUT
R2IN
+5V INPUT
C2+-10V
RS-232
OUTPUTS
RS-232
INPUTS
TTL/CMOS
INPUTS
TTL/CMOS
OUTPUTS
GND
5kΩ
400kΩ
400kΩ
+5V
+5V
+10V TO -10V
VOLTAGE INVERTER
VCC
+5V TO +10V
VOLTAGE DOUBLERSHDN(N.C.)
ALL CAPACITORS = 0.1µF
C2-
C1+
C1-+
TOP VIEW
Figure 5. MAX220/MAX232/MAX232A Pin Configuration and Typical Operating Circuit
Figure 6. MAX222/MAX242 Pin Configurations and Typical Operating Circuit
MAX220–MAX249+5V-Powered, Multichannel
RS-232 Drivers/Receivers
VCC
VCCVCC
400kΩ
400kΩ
400kΩ
400kΩ
400kΩ
T1OUT+5V
+5V
0.1µF
+5V27
GNDENR
ENR
GND
+5V
+5V
+5V
T2OUT
T3OUT
T4OUT
5kΩ
5kΩ
5kΩ
5kΩ
5kΩ13
T5OUT
T5OUT
R1IN
R2IN
R3IN
R4IN
R5IN
T1IN11
T2IN
T3IN
T4IN
T5IN
ENT
R2OUT
R3OUT
R4OUT
PINS (ENR, GND, VCC, T5OUT) ARE INTERNALLY CONNECTED.
CONNECT EITHER OR BOTH EXTERNALLY. T5OUT IS A SINGLE DRIVER.
R5OUT
R1OUT
VCC
ENT
T3INT2IN
T1IN
ENR
ENR
T4IN
T5IN
R4OUT
R5OUTR3IN
R3OUT
R2OUT
R1OUT
R5IN
R4IN
T3OUT
T4OUTT2OUT
T1OUT
R1IN
R2IN
MAX225
T5OUT
MAX225 FUNCTIONAL DESCRIPTION
5 RECEIVERS
5 TRANSMITTERS
2 CONTROL PINS
1 RECEIVER ENABLE (ENR)
1 TRANSMITTER ENABLE (ENT)
T5OUTGND
GND
TOP VIEW
Figure 7. MAX225 Pin Configuration and Typical Operating Circuit
MAX220–MAX249+5V-Powered, Multichannel
RS-232 Drivers/Receivers
GNDR3OUTR4OUT
R3IN
R4IN
5kΩ
5kΩ4R2OUTR2IN
5kΩ
RS-232
INPUTS
LOGIC
OUTPUTS
RS-232
OUTPUTS
TTL/CMOS
INPUTS9R1OUTR1IN
5kΩ18R5OUTR5IN
5kΩ7T1INT1OUT
+5V
400kΩ
+5V3T2INT2OUTT2
400kΩT3OUT1T3IN
+5V
400kΩ
C1+
C1-
1.0µFVCC
+5V INPUT
1.0µF
1.0µF
+5V TO +10V
VOLTAGE DOUBLER
1.0µF21T4INT4OUT
+5V
400kΩ
C2+
C2-
1.0µF16
+10V TO -10V
VOLTAGE INVERTER
EN (EN)2425
T4OUT
R3IN
R3OUT
SHDN (SHDN)
R4IN*
C2+
R4OUT*
T4IN
T3IN
R5OUT*
R5IN*
C2-
C1-
C1+
VCC
GND
R1IN
R1OUT
T1IN
T2IN
R2OUT
R2IN
T2OUT
T1OUT
T3OUT
Wide SO/
SSOP
MAX223
MAX241
EN (EN)
SHDN
(SHDN)
*R4 AND R5 IN MAX223 REMAIN ACTIVE IN SHUTDOWN.
NOTE: PIN LABELS IN ( ) ARE FOR MAX241.
TOP VIEW
Figure 8. MAX223/MAX241 Pin Configuration and Typical Operating Circuit
MAX220–MAX249+5V-Powered, Multichannel
RS-232 Drivers/Receivers
T5IN
N.C.
SHDNT2IN
T2OUT
T1OUT
T5OUT
T4IN
T3INC1+
VCC
GND
T1IN
C2-
C2+C1-
DIP/SO
MAX230C1+
C1-
T3IN
T4IN
T2IN
T5IN
T1OUT
T2OUT
+5V INPUT
C2+
C2-
RS-232
OUTPUTS
TTL/CMOS
INPUTS
GND
400kΩ
+5V
400kΩ
+5V
400kΩ
+5V
400kΩ
+5V
400kΩ
+5V
+10V TO -10V
VOLTAGE INVERTER
VCC
+5V TO +10V
VOLTAGE DOUBLER
1.0µF
1.0µF
1.0µF
1.0µF
T3OUTT4OUTx
T1IN
T3OUT
T4OUT
T5OUT
1.0µF
N.C.SHDN
TOP VIEW
Figure 9. MAX230 Pin Configuration and Typical Operating CircuitC1+
C1-T2IN
T1INT1OUT
T2OUT
+5V INPUT
RS-232
INPUTS
TTL/CMOS
OUTPUTS
GND
12 (14)
5kΩ
5kΩ
+12V TO -12V
VOLTAGE CONVERTER
13 (15)
1.0µF
1.0µF
1.0µF
400kΩ
+5V
400kΩ
+5V10R1IN
R2INR2OUT
R1OUT
VCC
GND
T1OUTT2OUT
MAX231
R1IN
R1OUT
T1IN
N.C.N.C.
T2IN
R2OUT
R2IN
(12)
RS-232
OUTPUTS
TTL/CMOS
INPUTS
(11)
(13)(10)
VCC
PIN NUMBERS IN ( ) ARE FOR SO PACKAGE.
VCC
GND
T1OUTT2OUT
MAX231
R1IN
R1OUT
T1INT2IN
R2OUT
R2IN
DIP
+7.5V TO +12V
(16)+
TOP VIEW
Figure 10. MAX231 Pin Configurations and Typical Operating Circuit

Partno	Mfg	Dc	Qty	Available	Descript
MAX232		N/a	1000	avai	+5V-Powered, Multichannel RS-232 Drivers/Receivers
MAX232A		N/a	19	avai	+5V-Powered, Multichannel RS-232 Drivers/Receivers
MAX234	MAXIM	N/a	9	avai	+5V-Powered, Multichannel RS-232 Drivers/Receivers
MAX237		N/a	100	avai	+5V-Powered, Multichannel RS-232 Drivers/Receivers
MAX238		N/a	1000	avai	+5V-Powered, Multichannel RS-232 Drivers/Receivers