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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 communications
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 packages
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.
Benefits and Features
Saves Board Space
●● Integrated Charge Pump Circuitry
• Eliminates the Need for a Bipolar ±12V Supply
• Enables Single Supply Operation from +5V Supply
●● Integrated Capacitors (MAX223, MAX233, MAX235,
MAX245–MAX247)
Saves Power for Reduced Power Requirements
●● 5μW Shutdown Mode
Ordering Information and Selection Table appears at end of
data sheet.
Applications
●● Interface Translation
●● Multidrop RS-232 Networks
●● Portable Diagnostics Equipment
AutoShutdown and UCSP are trademarks of Maxim Integrated
Products, Inc.
MAX220/MAX232/MAX232A Pin Configuration and Typical Operating Circuit
+5V INPUT
TOP VIEW
C5
C1+ 1
+
16 VCC
V+ 2
15 GND
C1- 3
14 T1OUT
C2+ 4
C2- 5
MAX220
MAX232
MAX232A
C1
C2
T2OUT 7
10 T2IN
9
R2OUT
TTL/CMOS
INPUTS
DIP/SO
DEVICE
MAX220
MAX232
MAX232A
CAPACITANCE (µF)
C1 C2 C3 C4 C5
0.047 0.33 0.33 0.33 0.33
1.0 1.0 1.0 1.0 1.0
0.1 0.1 0.1 0.1 0.1
C1+
+5V
400kΩ
11 T1IN
12 R1OUT
11 T1IN
16
VCC
V+ 2 +10V
+5V TO +10V
3 C1VOLTAGE DOUBLER
4
6 -10V
C2+
+10V TO -10V
V5 C2- VOLTAGE INVERTER
C4
1
13 R1IN
V- 6
R2IN 8
T1OUT 14
+5V
400kΩ
10 T2IN
T2OUT 7
12 R1OUT
TTL/CMOS
OUTPUTS
RS-232
OUTPUTS
R1IN 13
5kΩ
R2IN 8
9 R2OUT
5kΩ
GND
19-4323; Rev 18; 5/19
C3
15
RS-232
INPUTS
MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
Absolute Maximum Ratings—MAX220/222/232A/233A/242/243
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
(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
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, VSHDN or 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.
Electrical Characteristics—MAX220/222/232A/233A/242/243
(VCC = +5V ±10%, C1–C4 = 0.1μF‚ MAX220, C1 = 0.047μF, C2–C4 = 0.33μF, TA = TMIN to TMAX‚ unless otherwise noted.) (Note 3)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
RS-232 TRANSMITTERS
Output Voltage Swing
All transmitter outputs loaded with 3kΩ to GND
±5
Input Logic-Low Voltage
Input Logic-High Voltage
All devices except MAX220
MAX220: VCC = +5.0V
2
Output Leakage Current
V
0.8
1.4
5
40
VSHDN = 0V, MAX222/MAX242, shutdown, MAX220
±0.01
±1
VCC = +5.5V, VSHDN = 0V, VOUT = ±15V, MAX222/
MAX242
±0.01
±10
±0.01
±10
VCC = VSHDN = 0V
Data Rate
VOUT = ±15V
MAX220, VOUT = ±12V
Transmitter Output Resistance
VCC = V+ = V- = 0V, VOUT = ±2V
Output Short-Circuit Current
VOUT = 0V
VOUT = 0V
V
V
2.4
All except MAX220, normal operation
Logic Pullup/lnput Current
±8
1.4
µA
µA
±25
200
300
10M
±7
±22
MAX220
116
kbps
Ω
±60
mA
RS-232 RECEIVERS
±30
RS-232 Input Voltage Operating Range
MAX220
RS-232 Input Threshold Low
VCC = +5V
RS-232 Input Threshold High
VCC = +5V
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±25
All except MAX243 R2IN
0.8
MAX243 R2IN (Note 4)
-3
1.3
V
V
All except MAX243 R2IN
1.8
2.4
MAX243 R2IN (Note 4)
-0.5
-0.1
V
Maxim Integrated │ 2
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 = TMIN to TMAX‚ unless otherwise noted.) (Note 3)
PARAMETER
RS-232 Input Hysteresis
RS-232 Input Resistance
TTL/CMOS Output Voltage Low
TTL/CMOS Output Voltage High
TTL/CMOS Output Short-Circuit Current
TTL/CMOS Output Leakage Current
CONDITIONS
All except MAX220/MAX243, VCC = +5V, no
hysteresis in shutdown
MIN
TYP
MAX
0.2
0.5
1.0
MAX220
0.3
MAX243
1
TA = +25°C (MAX220)
3
5
7
5
7
0.2
0.4
IOUT = 1.6mA (MAX220)
IOUT = -1.0mA
Sourcing VOUT = VGND
Sinking VOUT = VCC
0.4
3.5
VCC 0.2
-2
-10
10
30
VSHDN = VCC or VEN = VCC (VSHDN = 0V for
MAX222), 0V ≤ VOUT ≤ VCC
EN Input Threshold Low
MAX242
EN Input Threshold High
MAX242
2.0
Supply Voltage Range
VCC Supply Current (VSHDN = VCC),
Figures 5, 6, 11, 19
3kΩ load
both inputs
V
V
mA
±10
µA
1.4
0.8
V
1.4
V
5.5
0.5
2
MAX222/MAX232A/MAX233A/
MAX242/MAX243
4
10
MAX220
12
MAX222/MAX232A/MAX233A/
MAX242/MAX243
15
TA = +25°C
V
mA
0.1
10
TA = 0°C to +70°C
2
50
2
50
TA = -55°C to +125°C
35
100
±1
µA
1.4
0.8
V
Shutdown Supply Current
MAX222/
MAX242
SHDN Input Leakage Current
MAX222/MAX242
SHDN Threshold Low
MAX222/MAX242
SHDN Threshold High
MAX222/MAX242
Transition Slew Rate
MAX222/MAX232A/
CL = 50pF to 2500pF,
RL = 3kΩ to 7kΩ, VCC MAX233/MAX242/MAX243
= +5V, TA = +25°C,
measured from +3V to
MAX220
-3V or -3V to +3V
TA = -40°C to +85°C
tPHLT, Figure 1
Transmitter Propagation Delay TLL to
RS-232 (Normal Operation)
tPLHT, Figure 1
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kΩ
±0.05
4.5
MAX220
No load
V
3
IOUT = 3.2mA
UNITS
MAX222/MAX232A/
MAX233/MAX242/MAX243
MAX220
MAX222/MAX232A/
MAX233/MAX242/MAX243
MAX220
2.0
1.4
6
12
µA
V
30
V/µs
1.5
3
30.0
1.3
3.5
4
10
1.5
3.5
5
10
µs
Maxim Integrated │ 3
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 = TMIN to TMAX‚ unless otherwise noted.) (Note 3)
PARAMETER
CONDITIONS
MIN
TYP
MAX
tPHLR, Figure 2
MAX222/MAX232A/MAX233/
MAX242/MAX243
0.5
1
MAX220
0.6
3
tPLHR, Figure 2
MAX222/MAX232A/MAX233/
MAX242/MAX243
0.6
1
MAX220
0.8
3
MAX242
0.5
10
MAX242
2.5
10
Receiver Propagation Delay RS-232 to TLL
(Normal Operation)
Receiver Propagation Delay RS-232 to TLL tPHLS, Figure 2
(Shutdown)
tPHLS, Figure 2
UNITS
µs
µs
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 startup), Figure 4
250
µs
Transmitter-Output Disable Time
(SHDN Goes Low)
tDT
MAX222/MAX242,
0.1µF caps, Figure 4
600
ns
Transmitter + to - Propagation Delay
Difference (Normal Operation)
tPHLT - tPLHT
MAX222/MAX232A/MAX233/
MAX242/MAX243
300
MAX220
2000
Receiver + to - Propagation Delay
Difference (Normal Operation)
tPHLR - tPLHR
MAX222/MAX232A/MAX233/
MAX242/MAX243
100
MAX220
225
Receiver-Output Enable Time
ns
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.
Typical Operating Characteristics
MAX220/MAX222/MAX232A/MAX233A/MAX242/MAX243
-2
V- LOADED, NO LOAD ON V+
2
0.1µF
1µF
0.1µF
-4
-6
ALL CAPS
1µF
9
VCC = +5.25V
8
ALL CAPS
0.1µF
7
VCC = +4.75V
6
+5V
+5V
V+ LOADED, NO LOAD ON V0
5
10
15
LOAD CURRENT (mA)
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20
25
4
10
20
30
40
50
60
V+
0.1µF CAPS
SHDN
0V
1µF CAPS
V0
1µF CAPS
MAX220-03
V+
0V
5
-8
-10
10
+10V
V+, V- VOLTAGE (V)
OUTPUT VOLTAGE (V)
0
VCC = +5V
NO LOAD ON
TRANSMITTER OUTPUTS
(EXCEPT MAX220, MAX233A)
4
OUTPUT LOAD CURRENT
FLOWS FROM V+ TO V-
MAX222/MAX242
ON-TIME EXITING SHUTDOWN
MAX220-02
EITHER V+ OR V- LOADED
6
11
MAX220-01
1µF
8
OUTPUT CURRENT (mA)
10
AVAILABLE OUTPUT CURRENT
vs. DATA RATE
OUTPUT VOLTAGE vs. LOAD CURRENT
-10V
0.1µF CAPS
V-
500ms/div
DATA RATE (kb/s)
Maxim Integrated │ 4
MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
Absolute Maximum Ratings—MAX223/MAX230–MAX241
(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
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.
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 = TMIN to TMAX; unless otherwise noted.) (Note 5)
PARAMETER
Output Voltage Swing
VCC Supply Current
CONDITIONS
All transmitter outputs loaded with 3kΩ to ground
No load,
TA = +25°C
V+ Supply Current
MIN
TYP
±5.0
±7.3
5
10
MAX223/230/234–238/240/241
7
15
MAX231/239
0.4
1
MAX231
1.8
5
MAX239
5
15
MAX223
15
50
MAX230/235/236/240/241
1
10
TA = +25°C
Input Logic-Low Voltage
TIN, EN, SHDN (MAX233); EN, SHDN (MAX230/235–241)
0.8
TIN
2.0
Input Logic-High Voltage
EN, SHDN (MAX223);
EN, SHDN (MAX230/235/236/240/241)
2.4
Logic Pullup Current
VTIN = 0V
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mA
mA
µA
V
V
1.5
-30
UNITS
V
MAX232/233
Shutdown Supply Current
Receiver Input Voltage
Operating Range
MAX
200
µA
+30
V
Maxim Integrated │ 5
MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
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 = TMIN to TMAX; unless otherwise noted.) (Note 5)
PARAMETER
RS-232 Input Logic-Low Voltage
RS-232 Input Logic-High Voltage
CONDITIONS
TA = +25°C,
VCC = +5V
TA = +25°C,
VCC = +5V
MIN
TYP
Normal operation
VSHDN = +5V (MAX223)
VSHDN = 0V (MAX235/236/240/241)
0.8
1.2
Shutdown (MAX223)
VSHDN = 0V,
VEN = +5V (R4IN, R5IN)
0.6
MAX
V
1.5
Normal operation
VSHDN = 5V (MAX223)
VSHDN = 0V (MAX235/236/240/241)
1.7
Shutdown (MAX223)
VSHDN = 0V,
VEN = +5V (R4IN‚ R5IN)
1.5
2.4
0.2
0.5
1.0
V
3
5
7
kΩ
0.4
V
2.4
V
RS-232 Input Hysteresis
VCC = +5V, no hysteresis in shutdown
RS-232 Input Resistance
TA = +25°C, VCC = +5V
TTL/CMOS Output Voltage Low
IOUT = 1.6mA (MAX231/232/233, IOUT = 3.2mA)
TTL/CMOS Output Voltage High
IOUT = -1mA
TTL/CMOS Output Leakage
Current
0V ≤ ROUT ≤ VCC; VEN = 0V (MAX223);
VEN = VCC (MAX235–241)
Receiver Output Enable Time
Normal
operation
MAX223
600
MAX235/236/239/240/241
400
Receiver Output Disable Time
Normal
operation
MAX223
900
MAX235/236/239/240/241
250
Normal operation
0.5
10
Propagation Delay
RS-232 IN to
TTL/CMOS OUT,
CL = 150pF
tPHLS
4
40
tPLHS
6
40
5.1
30
Transition Region Slew Rate
Transmitter Output Resistance
Transmitter Output Short-Circuit
Current
UNITS
3.5
VSHDN = 0V
(MAX223)
MAX223/MAX230/MAX234–241, TA = +25°C, VCC = +5V,
RL = 3kΩ to 7kΩ‚ CL = 50pF to 2500pF, measured from
+3V to -3V or -3V to +3V
±0.05
3
V
±10
µA
ns
ns
µs
V/μs
MAX231/MAX232/MAX233, TA = +25°C, VCC = +5V,
RL = 3kΩ to 7kΩ, CL = 50pF to 2500pF, measured from
+3V to -3V or -3V to +3V
VCC = V+ = V- = 0V, VOUT = ±2V
VCC
- 0.4
4
300
30
Ω
±10
mA
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.
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Maxim Integrated │ 6
MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
Typical Operating Characteristics
MAX223/MAX230–MAX241
TRANSMITTER OUTPUT VOLTAGE (VOH)
vs. LOAD CAPACITANCE AT
DIFFERENT DATA RATES
7.2
3 TRANSMITTERS
LOADED
TA = +25°C
C1–C4 = 1µF
TRANSMITTER
4 TRANSMITTERS LOADS =
LOADED
3kΩ || 2500pF
5.0
6.6
6.4
6.2
6.0
5.5
VCC (V)
-6.5
TA = +25°C
C1–C4 = 1µF
TRANSMITTER
LOADS =
3kΩ || 2500pF
-7.5
-8.0
1 TRANSMITTER
LOADED
2 TRANSMITTERS
LOADED
-8.5
-9.0
4.5
-6.0
-6.4
-6.6
4.0
1500
2500
2000
3 TRANSMITTERS
LOADED
4 TRANSMITTERS
LOADED
500
0
-6.8
3 TRANSMITTERS
LOADED
-7.2
5.0
-7.6
1500
2000
2500
10
TRANSMITTER OUTPUT VOLTAGE (V+, V-)
vs. LOAD CURRENT
8
6
TA = +25°C
VCC = +5V
C1–C4 = 1µF
V- LOADED,
V+ AND VNO LOAD
EQUALLY
ON V+
LOADED
2
0
-2
V+ LOADED,
NO LOAD
ON V-
-4
-6
-8
-7.4
5.5
1000
LOAD CAPACITANCE (pF)
4
160kb/s
80kb/s
20kb/s
-7.0
VCC (V)
1000
7.0
5.0
TA = +25°C
VCC = +5V
3 TRANSMITTERS LOADED
RL = 3kΩ
C1–C4 = 1µF
-6.2
VOL (V)
VOL (V)
-7.0
500
2 TRANSMITTERS
LOADED
8.0
6.0
TRANSMITTER OUTPUT VOLTAGE (VOL)
vs. LOAD CAPACITANCE AT
DIFFERENT DATA RATES
MAX220-07
4 TRANSMITTERS
LOADED
0
9.0
LOAD CAPACITANCE (pF)
TRANSMITTER OUTPUT
VOLTAGE (VOL) vs. VCC
-6.0
TA = +25°C
VCC = +5V
3 TRANSMITTERS LOADED
RL = 3kΩ
C1–C4 = 1µF
10.0
MAX220-09
4.5
160kb/s
80kb/s
20kb/s
MAX220-08
7.0
6.8
1 TRANSMITTER LOADED
TA = +25°C
VCC = +5V
LOADED, RL = 3kΩ
C1–C4 = 1µF
11.0
SLEW RATE (V/µs)
1 TRANSMITTER
LOADED
7.5
6.5
7.0
VOH (V)
VOH (V)
8.0
12.0
MAX220-06
7.4
MAX220-05
2 TRANSMITTERS
LOADED
TRANSMITTER SLEW RATE
vs. LOAD CAPACITANCE
V+, V- (V)
8.5
MAX220-04
TRANSMITTER OUTPUT
VOLTAGE (VOH) vs. VCC
-10
0
500
1000
1500
2500
2000
LOAD CAPACITANCE (pF)
ALL TRANSMITTERS UNLOADED
0
5
10 15 20 25 30 35 40 45 50
CURRENT (mA)
V+, V- WHEN EXITING SHUTDOWN
(1µF CAPACITORS)
MAX220-13
V+
O
V-
VSHDN*
500ms/div
*SHUTDOWN POLARITY IS REVERSED
FOR NON MAX241 PARTS
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Maxim Integrated │ 7
MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
Absolute Maximum Ratings—MAX225/MAX244–MAX249
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
(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
Note 6: Input voltage measured with transmitter output in a high-impedance state, shutdown, or 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.
Electrical Characteristics—MAX225/MAX244–MAX249
(MAX225, VCC = +5.0V ±5%; MAX244–MAX249, VCC = +5.0V ±10%, external capacitors C1–C4 = 1μF; TA = TMIN to TMAX; unless
otherwise noted.) (Note 7)
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
1.4
0.8
V
RS-232 TRANSMITTERS
Input Logic-Low Voltage
Input Logic-High Voltage
2
Normal operation
Logic Pullup/lnput Current
Tables 1a–1d
Data Rate
Tables 1a–1d, normal operation
Output Voltage Swing
All transmitter outputs loaded with 3kΩ to GND
Output Leakage Current (Shutdown)
Tables 1a–1d
Transmitter Output Resistance
Output Short-Circuit Current
RS-232 RECEIVERS
Shutdown
±5
1.4
V
10
50
±0.01
±1
120
64
±7.5
±0.01
±25
VCC = 0V, VOUT = ±15V
±0.01
±25
VOUT = 0V
10M
Ω
±7
±30
mA
±25
VCC = +5V
RS-232 Input Logic-High Voltage
VCC = +5V
RS-232 Input Hysteresis
VCC = +5V
RS-232 Input Resistance
1.3
1.8
2.4
V
0.2
0.5
1.0
V
5
7
kΩ
0.2
0.4
V
3
V
IOUT = 3.2mA
TTL/CMOS Output Voltage High
IOUT = -1.0mA
3.5
VCC 0.2
Sourcing VOUT = VGND
-2
-10
Sinking VOUT = VCC
10
30
TTL/CMOS Output Leakage Current
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Normal operation, outputs disabled,
Tables 1a–1d, 0V ≤ VOUT ≤ VCC, VENR_ = VCC
V
0.8
TTL/CMOS Output Voltage Low
TTL/CMOS Output Short-Circuit Current
μA
300
RS-232 Input Voltage Operating Range
RS-232 Input Logic-Low Voltage
kbps
V
VENA, VENB, VENT, VENTA,
VENTB = VCC, VOUT = ±15V
VCC = V+ = V- = 0V, VOUT = ±2V (Note 8)
μA
V
mA
±0.05
±0.10
μA
Maxim Integrated │ 8
MAX220–MAX249
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RS-232 Drivers/Receivers
Electrical Characteristics—MAX225/MAX244–MAX249 (continued)
(MAX225, VCC = +5.0V ±5%; MAX244–MAX249, VCC = +5.0V ±10%, external capacitors C1–C4 = 1μF; TA = TMIN to TMAX; unless
otherwise noted.) (Note 7)
PARAMETER
CONDITIONS
MIN
TYP
MAX
MAX225
4.75
5.25
MAX244–MAX249
4.5
5.5
UNITS
POWER SUPPLY AND CONTROL LOGIC
Supply Voltage Range
VCC Supply Current
(Normal Operation)
Shutdown Supply Current
No load
3kΩ loads on
all outputs
MAX225
10
20
MAX244–MAX249
11
30
MAX225
40
MAX244–MAX249
57
TA = +25°C
8
TA = TMIN to TMAX
mA
25
50
Leakage current
Control Input
V
±1
Logic-low voltage
1.4
Logic-high voltage
2.4
1.4
5
10
0.8
µA
V
AC CHARACTERISTICS
Transition Slew Rate
Transmitter Propagation Delay
TLL to RS-232 (Normal Operation)
CL = 50pF to 2500pF, RL = 3kΩ to 7kΩ, VCC = +5V,
TA = +25°C, measured from +3V to -3V or -3V to +3V
tPHLT, Figure 1
30
1.3
3.5
tPLHT, Figure 1
1.3
3.5
V/μs
µs
Receiver Propagation Delay
TLL to RS-232 (Normal Operation)
tPHLR, Figure 2
0.6
1.5
tPLHR, Figure 2
0.6
1.5
Receiver Propagation Delay
TLL to RS-232 (Low-Power Mode)
tPHLS, Figure 2
0.6
1.5
tPLHS, Figure 2
0.6
10
Transmitter + to - Propagation
Delay Difference (Normal Operation)
tPHLT - tPLHT
350
ns
Receiver + to - Propagation
Delay Difference (Normal Operation)
tPHLR - tPLHR
350
ns
Receiver-Output Enable Time
tER, Figure 3
Receiver-Output Disable Time
Transmitter Enable Time
Transmitter Disable Time
tDR, Figure 3
tET
tDT, Figure 4
µs
µs
100
500
ns
100
500
ns
MAX246–MAX249
(excludes charge-pump startup)
5
µs
MAX225/MAX245–MAX249
(includes charge-pump startup)
10
ms
100
ns
Note 7: All units production tested at hot. Specifications over temperature are guaranteed by design.
Note 8: The 300Ω minimum specification complies with EIA/TIA-232E, but the actual resistance when in shutdown mode or VCC =
0V is 10MΩ as is implied by the leakage specification.
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Maxim Integrated │ 9
MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
Typical Operating Characteristics
MAX225/MAX244–MAX249
EXTERNAL POWER SUPPLY
1µF CAPACITORS
12
10
40kb/s DATA RATE
8 TRANSMITTERS
LOADED WITH 3kΩ
8
6
4
VCC = +5V
EXTERNAL CHARGE PUMP
1µF CAPACITORS
8 TRANSMITTERS
DRIVING 5kΩ AND
2000pF AT 20kb/s
2
0
-2
-4
4
V- LOADED
-8
0
1
2
3
LOAD CAPACITANCE (nF)
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4
5
-10
5
10
15
20
8.0
25
LOAD CURRENT (mA)
30
7.5
40kb/s
7.0
60kb/s
6.5
6.0
V+ LOADED
0
VCC = +5V WITH ALL TRANSMITTERS DRIVEN
LOADED WITH 5kΩ
10kb/s
20kb/s
8.5
EITHER V+ OR
V- LOADED
V+ AND V- LOADED
-6
9.0
35
MAX220-12
V+ AND V- LOADED
6
14
2
8
MAX220-11
16
10
MAX220-10
VCC = +5V
OUTPUT VOLTAGE (V)
TRANSMITTER SLEW RATE (V/µs)
18
TRANSMITTER OUTPUT VOLTAGE (V+, V-)
vs. LOAD CAPACITANCE AT
DIFFERENT DATA RATES
OUTPUT VOLTAGE
vs. LOAD CURRENT FOR V+ AND V-
V+, V- (V)
TRANSMITTER SLEW RATE
vs. LOAD CAPACITANCE
5.5
5.0
100kb/s
200kb/s
ALL CAPACITIORS 1µF
0
1
2
3
4
5
LOAD CAPACITANCE (nF)
Maxim Integrated │ 10
MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
Test Circuits/Timing Diagrams
+3V
0V*
INPUT
+3V
INPUT
50%
50%
50%
50%
0V
OUTPUT
GND
V+
0V
V-
OUTPUT
tPLHT
VCC
tPLHR
tPLHS
tPHLR
tPHLS
tPHLT
*EXCEPT FOR R2 ON THE MAX243
WHERE -3V IS USED.
Figure 1. Transmitter Propagation-Delay Timing
EN
RX IN
RX
a) TEST CIRCUIT
EN INPUT
RX OUT 1kΩ
VCC - 2V
Figure 2. Receiver Propagation-Delay Timing
SHDN
+3V
0V
150pF
OUTPUT DISABLE TIME (tDT)
+3V
0V
EN
OUTPUT ENABLE TIME (tER)
+5V
0V
-5V
+3.5V
RECEIVER
OUTPUTS
V+
V-
+0.8V
a) TIMING DIAGRAM
b) ENABLE TIMING
+3V
EN INPUT
EN
0V
VOH
RECEIVER
OUTPUTS
VOL
1 OR 0
TX
OUTPUT DISABLE TIME (tDR)
3kΩ
50pF
VOH - 0.5V
VCC - 2V
VOL + 0.5V
b) TEST CIRCUIT
c) DISABLE TIMING
Figure 3. Receiver-Output Enable and Disable Timing
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Figure 4. Transmitter-Output Disable Timing
Maxim Integrated │ 11
MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
Control Pin Configuration Tables
Table 1a. MAX245 Control Pin Configurations
ENT
ENR
0
0
Normal Operation
0
1
1
0
1
1
OPERATION STATUS
TRANSMITTERS
RECEIVERS
All Active
All Active
Normal Operation
All Active
All High-Z
Shutdown
All High-Z
All Low-Power Receive Mode
Shutdown
All High-Z
All High-Z
Table 1b. MAX245 Control Pin Configurations
TRANSMITTERS
RECEIVERS
ENT
ENR
OPERATION
STATUS
TA1–TA4
TB1–TB4
0
0
Normal Operation
All Active
All Active
All Active
All Active
RA1–RA4 High-Z,
RA5 Active
RA1–RA5
RB1–RB5
0
1
Normal Operation
All Active
All Active
RA1–RA4 High-Z,
RA5 Active
1
0
Shutdown
All High-Z
All High-Z
All Low-Power
Receive Mode
All Low-Power
Receive Mode
1
1
Shutdown
All High-Z
All High-Z
RA1–RA4 High-Z,
RA5 Low-Power
Receive Mode
RA1–RA4 High-Z,
RA5 Low-Power
Receive Mode
Table 1c. MAX246 Control Pin Configurations
TRANSMITTERS
RECEIVERS
ENA
ENB
OPERATION
STATUS
TA1–TA4
TB1–TB4
0
0
Normal Operation
All Active
All Active
All Active
All Active
0
1
Normal Operation
All Active
All Active
All Active
RA1–RA4 High-Z,
RA5 Active
1
0
Shutdown
All High-Z
All High-Z
RA1–RA4 High-Z,
RA5 Active
All Low-Power
Receive Mode
1
1
Shutdown
All High-Z
All High-Z
RA1–RA4 High-Z,
RA5 Low-Power
Receive Mode
RA1–RA4 High-Z,
RA5 Low-Power
Receive Mode
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RA1–RA5
RB1–RB5
Maxim Integrated │ 12
MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
Table 1d. MAX247/MAX248/MAX249 Control Pin Configurations
TRANSMITTERS
ENTA ENTB ENRA ENRB
OPERATION
STATUS
RECEIVERS
MAX247
TA1–TA4
TB1–TB4
RA1–RA4
RB1–RB5
MAX248
TA1–TA4
TB1–TB4
RA1–RA4
RB1–RB4
MAX249
TA1–TA3
TB1–TB3
RA1–RA5
RB1–RB5
0
0
0
0
Normal Operation
All Active
All Active
All Active
All Active
0
0
0
1
Normal Operation
All Active
All Active
All Active
All High-Z, except
RB5 stays active on
MAX247
0
0
1
0
Normal Operation
All Active
All Active
All High-Z
All Active
0
0
1
1
Normal Operation
All Active
All Active
All High-Z
All High-Z, except
RB5 stays active on
MAX247
0
1
0
0
Normal Operation
All Active
All High-Z
All Active
All Active
0
1
0
1
Normal Operation
All Active
All High-Z
All Active
All High-Z, except
RB5 stays active on
MAX247
0
1
1
0
Normal Operation
All Active
All High-Z
All High-Z
All Active
0
1
1
1
Normal Operation
All Active
All High-Z
All High-Z
All High-Z, except
RB5 stays active on
MAX247
1
0
0
0
Normal Operation
All High-Z
All Active
All Active
All Active
1
0
0
1
Normal Operation
All High-Z
All Active
All Active
All High-Z, except
RB5 stays active on
MAX247
1
0
1
0
Normal Operation
All High-Z
All Active
All High-Z
All Active
1
0
1
1
Normal Operation
All High-Z
All Active
All High-Z
All High-Z, except
RB5 stays active on
MAX247
1
1
0
0
Shutdown
All High-Z
All High-Z
Low-Power
Receive Mode
Low-Power
Receive Mode
1
1
0
1
Shutdown
All High-Z
All High-Z
Low-Power
Receive Mode
All High-Z, except
RB5 stays active on
MAX247
1
1
1
0
Shutdown
All High-Z
All High-Z
All High-Z
Low-Power
Receive Mode
1
1
1
1
Shutdown
All High-Z
All High-Z
All High-Z
All High-Z, except
RB5 stays active on
MAX247
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Maxim Integrated │ 13
MAX220–MAX249
Detailed Description
The MAX220–MAX249 contain four sections: dual chargepump DC-DC voltage converters, RS-232 drivers, 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 double
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 Characteristics section), 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 minimum ±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 Vto
power external circuitry. When these parts are shut down,
V- falls to 0V, and V+ falls to +5V. For applications where
a +10V external supply is applied to the V+ pin (instead of
using the internal charge pump to generate +10V), the C1
capacitor must not be installed and the SHDN pin must be
connected to VCC. This is because V+ is internally connected to VCC in shutdown mode.
RS-232 Drivers
The typical driver output voltage swing is ±8V when loaded with a nominal 5kΩ RS-232 receiver and VCC = +5V.
Output swing is guaranteed to meet the EIA/TIA-232E
and V.28 specification, which calls for ±5V minimum driver
output levels under worst-case conditions. These include
a minimum 3kΩ load, VCC = +4.5V, and maximum operating temperature. Unloaded driver output 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
400kΩ input pullup resistors to VCC are 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 disabled. Driver
outputs turn off and enter a high-impedance state—where
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RS-232 Drivers/Receivers
leakage current is typically microamperes (maximum
25μA)—when in shutdown mode, in three-state mode, or
when device power is removed. Outputs can be driven
to ±15V. The powersupply 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-impedance, 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
1kΩ series 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 specifications. Typical slew rates are 24V/μs unloaded and 10V/μs
loaded with 3Ω and 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.
Table 2. Three-State Control of Receivers
PART
SHDN
SHDN
EN
EN(R)
RECEIVERS
X
Low
High
—
High Impedance
Active
High Impedance
MAX223
—
Low
High
High
MAX225
—
—
—
Low
High
High Impedance
Active
MAX235
MAX236
MAX240
Low
Low
High
—
—
Low
High
X
High Impedance
Active
High Impedance
Maxim Integrated │ 14
MAX220–MAX249
The receiver inputs withstand an input overvoltage up to
±25V and provide input terminating resistors with nominal
5kΩ values. 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 output 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 shutdown mode but still allows it to receive information. This is
important for applications where systems are periodically
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 communication at
faster data rates. This operation conserves system power.
Negative Threshold—MAX243
The MAX243 is pin compatible with the MAX232A, differing 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 connected 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/TIA232E specifications. This means a receiver output goes
high whenever its input is driven negative‚ left unconnected‚ 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 voltage level.
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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 current drops to
less than 25μA and the receivers continue to operate in
a low-power receive mode. Driver outputs enter a highimpedance state (three-state mode). On the MAX225‚
all five receivers are controlled by the ENR input. On the
MAX245‚ eight of the receiver outputs are controlled by
the ENR input‚ while the remaining two receivers (RA5
and RB5) are always active. RA1–RA4 and RB1–RB4
are put in a three-state mode when ENR is 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 lowpower 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.
Maxim Integrated │ 15
MAX220–MAX249
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 threestate mode. As in the MAX245, one Aside and one B-side
receiver (RA5 and RB5) remain active at all times. The
entire device is put into shutdown 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 ENRA and ENRB receiver
enable inputs each control four receiver outputs. The
ENTA and ENTB transmitter enable inputs each control
four drivers. The ninth receiver (RB5) is always active.
The device enters shutdown mode with a logic high on
both ENTA and ENTB.
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
The MAX249 provides ten receivers and six drivers with
four control pins. The ENRA and ENRB receiver enable
inputs each control five receiver outputs. The ENTA and
ENTB transmitter enable inputs control three drivers
each. There is no always-active receiver. The device
enters shutdown mode and transmitters go into a threestate mode with a logic high on both ENTA and 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 typical operating circuits. In applications that are sensitive to
power-supply noise, VCC should be decoupled to ground
with a capacitor of the same value as C1 and C2 connected as close as possible to the device.
The MAX248 provides eight receivers and eight drivers
with four control pins. The ENRA and ENRB receiver
enable inputs each control four receiver outputs. The
ENTA and ENTB transmitter enable inputs control four
drivers each. This part does not have an always-active
receiver. The device enters shutdown mode and transmitters go into a three-state mode with a logic high on both
ENTA and ENTB.
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Maxim Integrated │ 16
MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
+5V INPUT
TOP VIEW
C3
C5
C1+ 1
+
16 VCC
V+ 2
C2- 5
C1
15 GND
C1- 3
C2+ 4
14 T1OUT
MAX220
MAX232
MAX232A
C2
13 R1IN
+5V
400kΩ
11 T1IN
12 R1OUT
V- 6
11 T1IN
T2OUT 7
10 T2IN
9
R2IN 8
TTL/CMOS
INPUTS
R2OUT
DIP/SO
DEVICE
MAX220
MAX232
MAX232A
16
VCC
C1+
V+ 2 +10V
+5V TO +10V
3 C1VOLTAGE DOUBLER
4
6 -10V
C2+
+10V TO -10V
V5 C2- VOLTAGE INVERTER
C4
1
T1OUT 14
+5V
400kΩ
10 T2IN
12 R1OUT
TTL/CMOS
OUTPUTS
CAPACITANCE (µF)
C1 C2 C3 C4 C5
0.047 0.33 0.33 0.33 0.33
1.0 1.0 1.0 1.0 1.0
0.1 0.1 0.1 0.1 0.1
RS-232
OUTPUTS
T2OUT 7
R1IN 13
RS-232
INPUTS
5kΩ
R2IN 8
9 R2OUT
5kΩ
GND
15
Figure 5. MAX220/MAX232/MAX232A Pin Configuration and Typical Operating Circuit
+5V INPUT C3
TOP VIEW
ALL CAPACITORS = 0.1µF
C5
(N.C.) EN 1
(N.C.) EN 1
+
18 SHDN
+
C1+ 2
19 VCC
17 VCC
V+ 3
18 GND
V+ 3
16 GND
C1- 4
17 T1OUT
C1- 4
15 T1OUT
C2+ 5
14 R1IN
C2- 6
C2- 6
MAX222
MAX242
13 R1OUT
MAX222
MAX242
V- 7
16 N.C.
15 R1IN
+5V
14 R1OUT
12 T1IN
T2OUT 8
13 N.C.
T2OUT 8
11 T2IN
R2IN 9
12 T1IN
10 R2OUT R2OUT 10
11 T2IN
DIP/SO
C2
+5V
400kΩ
12 T1IN
V- 7
R2IN 9
C1
20 SHDN
C1+ 2
C2+ 5
17
VCC
3 +10V
C1+
+5V TO +10V
V+
4 C1VOLTAGE DOUBLER
5
C2+
7 -10V
+10V TO -10V
V6 C2C4
VOLTAGE INVERTER
2
TTL/CMOS
INPUTS
400kΩ
11 T2IN
(EXCEPT MAX220)
T1OUT 15
(EXCEPT MAX220)
T2OUT 8
13 R1OUT
TTL/CMOS
OUTPUTS
SSOP
( ) ARE FOR MAX222 ONLY.
PIN NUMBERS IN TYPICAL OPERATING CIRCUIT ARE FOR DIP/SO PACKAGES ONLY.
RS-232
OUTPUTS
R1IN 14
5kΩ
R2IN 9
10 R2OUT
1 (N.C.) EN
5kΩ
GND
SHDN
RS-232
INPUTS
18
16
Figure 6. MAX222/MAX242 Pin Configurations and Typical Operating Circuit
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Maxim Integrated │ 17
MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
+5V
TOP VIEW
0.1µF
28
+5V
VCC
27
VCC
400kΩ
ENR 1
+
28 VCC
ENR 2
27 VCC
T1IN 3
26 ENT
T2IN 4
R1OUT 5
T1IN
3
24 T4IN
R2OUT 6
23 T5IN
R3OUT 7
22 R4OUT
R3IN
21 R5OUT
8
R2IN 9
20 R5IN
R1IN 10
19 R4IN
T1OUT 11
18 T3OUT
T2OUT 12
17 T4OUT
GND 13
16 T5OUT
GND 14
15 T5OUT
SO
11
400kΩ
T2IN
4
T2OUT
+5V
25 T3IN
MAX225
T1OUT
+5V
12
400kΩ
T3IN
25
T3OUT
+5V
18
400kΩ
T4IN
24
T4OUT
+5V
400kΩ
T5OUT
T5IN
23
ENT
26
T5OUT
R1OUT
5
R1IN
17
16
15
10
5kΩ
R2OUT
6
R2IN
9
5kΩ
MAX225 FUNCTIONAL DESCRIPTION
5 RECEIVERS
5 TRANSMITTERS
2 CONTROL PINS
1 RECEIVER ENABLE (ENR)
1 TRANSMITTER ENABLE (ENT)
R3OUT
7
R3IN
8
5kΩ
R4OUT
22
R4IN
19
5kΩ
R5OUT
21
R5IN
20
5kΩ
PINS (ENR, GND, VCC, T5OUT) ARE INTERNALLY CONNECTED.
CONNECT EITHER OR BOTH EXTERNALLY. T5OUT IS A SINGLE DRIVER.
1
2
ENR
ENR
GND
13
GND
14
Figure 7. MAX225 Pin Configuration and Typical Operating Circuit
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Maxim Integrated │ 18
MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
TOP VIEW
1.0µF
12
C1+
1.0µF
14
C115
C2+
1.0µF
16 C2-
+5V INPUT
11
VCC
+5V TO +10V
VOLTAGE DOUBLER
V+
+10V TO -10V
VOLTAGE INVERTER
V-
13
1.0µF
17
1.0µF
+5V
400kΩ
T3OUT 1
7 T1IN
+
27 R3IN
T2OUT 3
26 R3OUT
R2IN 4
R2OUT 5
T2IN 6
25 SHDN (SHDN)
MAX223
MAX241
T1IN 7
24 EN (EN)
400kΩ
6 T2IN
TTL/CMOS
INPUTS
23 R4IN*
21 T4IN
R1IN 9
20 T3IN
GND 10
19 R5OUT*
VCC 11
18 R5IN*
C1+ 12
17 V-
V+ 13
16 C2-
C1- 14
15 C2+
Wide SO/
SSOP
T2
T2OUT 3
+5V
RS-232
OUTPUTS
400kΩ
20 T3IN
T3
T3OUT 1
+5V
22 R4OUT*
R1OUT 8
T1OUT 2
+5V
28 T4OUT
T1OUT 2
T1
400kΩ
21 T4IN
8 R1OUT
T4
R1
T4OUT 28
R1IN 9
5kΩ
5 R2OUT
R2
R2IN 4
5kΩ
LOGIC
OUTPUTS
26 R3OUT
R3
R3IN 27
5kΩ
22 R4OUT
R4
RS-232
INPUTS
R4IN 23
5kΩ
19 R5OUT
*R4 AND R5 IN MAX223 REMAIN ACTIVE IN SHUTDOWN.
NOTE: PIN LABELS IN ( ) ARE FOR MAX241.
24 EN (EN)
R5
GND
R5IN 18
5kΩ
SHDN 25
(SHDN)
10
Figure 8. MAX223/MAX241 Pin Configuration and Typical Operating Circuit
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Maxim Integrated │ 19
MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
TOP VIEW
T3OUT
1
1.0µF
+
20 T4OUT
T1OUT 2
19 T5IN
T2OUT 3
18 N.C.
T2IN 4
T1IN 5
+5V INPUT
1.0µF
1.0µF
+5V
15 T4IN
VCC 7
14 T3IN
C1+ 8
13 V-
V+ 9
12 C2-
C1- 10
11 C2+
400kΩ
4 T2IN
T2OUT 3
T2
+5V
400kΩ
14 T3IN
T3OUT 1
T3
+5V
400kΩ
15 T4IN
+5V
DIP/SO
1.0µF
T1OUT 2
T1
+5V
TTL/CMOS
INPUTS
1.0µF
400kΩ
5 T1IN
16 T5OUT
GND 6
9
11
+10V TO -10V
C2+
13
12
C2- VOLTAGE INVERTER V-
17 SHDN
MAX230
7
VCC
V+
+5V TO +10V
VOLTAGE DOUBLER
8 C1+
10 C1-
T4OUT 20
T4
400kΩ
19 T5IN
T5OUT 16
T5
N.C.x 18
GND
RS-232
OUTPUTS
17 SHDN
6
Figure 9. MAX230 Pin Configuration and Typical Operating Circuit
+5V INPUT
TOP VIEW
1
2
1.0µF
C+ 1
CV-
+
2
3
T2OUT 4
+7.5V TO +12V
1.0µF
MAX231
R2IN 5
14 V+
C+ 1
13 VCC
C- 2
15 VCC
12 GND
V- 3
14 GND
11 T1OUT T2OUT 4
10 R1IN
MAX231
9
R1OUT R2OUT 6
T2IN 7
8
T1IN
13 T1OUT
(10)
11 R1OUT
10 T1IN
N.C. 8
9
N.C.
SO
V+
V-
14
(16)
3
400kΩ
8
T1IN
+5V
TTL/CMOS
INPUTS
C2
1.0µF
T1OUT 11
T1
(13)
RS-232
OUTPUTS
400kΩ
12 R1IN
T2IN 7
C1-
VCC
+12V TO -12V
VOLTAGE CONVERTER
+5V
16 V+
R2IN 5
R2OUT 6
DIP
+
13 (15)
C1+
(11)
7
T2IN
9
R1OUT
T2OUT 4
T2
R1IN 10
R1
TTL/CMOS
OUTPUTS
5kΩ
6 R2OUT
(12)
RS-232
INPUTS
R2IN 5
R2
5kΩ
GND
PIN NUMBERS IN ( ) ARE FOR SO PACKAGE.
12 (14)
Figure 10. MAX231 Pin Configurations and Typical Operating Circuit
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Maxim Integrated │ 20
MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
+5V INPUT
1.0µF
TOP VIEW
7
VCC
+5V
T2IN
400kΩ
+
1
T1IN 2
19 R2IN
R1OUT 3
18 T2OUT
R1IN 4
MAX233
MAX233A
GND 6
400kΩ
16 C215 C2+
VCC 7
(V+) C1+
+5V
TTL/CMOS
INPUTS
17 V-
T1OUT 5
14 V+ (C1-)
GND 9
12 V- (C2+)
(V-) CS- 10
11 C2+ (C2-)
DIP/SO
T2OUT 18
1
T2IN
3
R1OUT
5kΩ
20 R2OUT
8 (13)
DO NOT MAKE
CONNECTIONS TO 13 (14)
THESE PINS
12 (10)
INTERNAL -10V
17
POWER SUPPLY
INTERNAL +10V
POWER SUPPLY
RS-232
OUTPUTS
R1IN 4
TTL/CMOS
OUTPUTS
13 C1- (C1+)
8
T1OUT 5
T1IN
2
20 R2OUT
RS-232
INPUTS
R2IN 19
5kΩ C2+ 11 (12)
C1+
C1-
C2+
V-
C2-
V14 (8) V+
CSGND
16
10 (11)
GND
6
PIN NAMES IN ( ) ARE FOR SO PACKAGE.
15
9
Figure 11. MAX233/MAX233A Pin Configuration and Typical Operating Circuit
1.0µF
TOP VIEW
7
1.0µF
9
10
T1OUT 1
+
16 T3OUT
T2OUT 2
C1C2+
11 C2-
12 V-
VCC 6
11 C2-
C1+ 7
10 C2+
9
V+ 8
4 T1IN
13 T3IN
GND 5
C1-
+10V TO -10V
VOLTAGE INVERTER
1.0µF
V+
V-
8
12
1.0µF
400kΩ
14 T4IN
MAX234
6
VCC
+5V TO +10V
VOLTAGE DOUBLER
+5V
15 T4OUT
T2IN 3
T1IN 4
1.0µF
C1+
+5V INPUT
T1
T1OUT
1
T2OUT
2
+5V
400kΩ
3 T2IN
T2
+5V
TTL/CMOS
INPUTS
RS-232
OUTPUTS
400kΩ
13 T3IN
T3
+5V
DIP/SO
T3OUT
16
T4OUT
15
400kΩ
14 T4IN
T4
GND
5
Figure 12. MAX234 Pin Configuration and Typical Operating Circuit
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Maxim Integrated │ 21
MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
TOP VIEW
1.0µF
+5V INPUT
12
+5V
VCC
400kΩ
8 T1IN
+5V
T4OUT 1
TTL/CMOS
INPUTS
+
T3OUT 2
23 R3OUT
T1OUT 3
22 T5IN
T2OUT 4
21 SHDN
R2IN 5
MAX235
R2OUT 6
18 R4IN
T1IN 8
17 R4OUT
R1OUT 9
16 T4IN
R1IN 10
15 T3IN
GND 11
14 R5OUT
VCC 12
13 R5IN
DIP
T3OUT 2
T4OUT 1
T4
+5V
22 T5IN
9 R1OUT
RS-232
OUTPUTS
400kΩ
16 T4IN
19 T5OUT
T2IN 7
T2OUT 4
T3
+5V
20 EN
T2
400kΩ
15 T3IN
24 R3IN
T1OUT 3
400kΩ
7 T2IN
+5V
T1
400kΩ
T5OUT 19
T5
R1IN 10
T1
5kΩ
6 R2OUT
R2IN 5
R2
5kΩ
TTL/CMOS
OUTPUTS
23 R3OUT
R3IN 24
R3
5kΩ
17 R4OUT
RS-232
INPUTS
R4IN 18
R4
5kΩ
14 R5OUT
R5IN 13
R5
5kΩ
20 EN
GND
SHDN
21
11
Figure 13. MAX235 Pin Configuration and Typical Operating Circuit
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Maxim Integrated │ 22
MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
TOP VIEW
1.0µF
10
1.0µF
12
13
1.0µF
14
+5V INPUT
9
VCC
+5V TO +10V
VOLTAGE DOUBLER
C1+
C1C2+
C2-
24 T4OUT
T1OUT 2
23 R2IN
T2OUT 3
22 R2OUT
21 SHDN
R1IN 4
R1OUT 5
MAX236
20 EN
T2IN 6
19 T4IN
T1IN 7
18 T3IN
GND 8
17 R3OUT
VCC 9
16 R3IN
C1+ 10
15 V-
V+ 11
14 C2-
C1- 12
13 C2+
RS-232
OUTPUTS
400kΩ
18 T3IN
T3OUT 1
T3
+5V
19 T4IN
5 R1OUT
1.0µF
T2OUT 3
T2
+5V
15
400kΩ
6 T2IN
TTL/CMOS
INPUTS
1.0µF
T1OUT 2
T1
+5V
11
400kΩ
7 T1IN
+
V-
+10V TO -10V
VOLTAGE INVERTER
+5V
T3OUT 1
V+
400kΩ
T4OUT 24
T4
R1IN 4
R1
5kΩ
DIP/SO
TTL/CMOS
OUTPUTS
22 R2OUT
R2IN 23
R2
RS-232
INPUTS
5kΩ
17 R3OUT
R3IN 16
R3
5kΩ
20 EN
GND
SHDN
21
8
Figure 14. MAX236 Pin Configuration and Typical Operating Circuit
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Maxim Integrated │ 23
MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
TOP VIEW
1.0µF
10
1.0µF
12
13
1.0µF
14
+5V INPUT
9
VCC
+5V TO +10V
VOLTAGE DOUBLER
C1+
C1C2+
1.0µF
V+
V-
+10V TO -10V
VOLTAGE INVERTER
C2-
11
15
1.0µF
+5V
T3OUT 1
400kΩ
+
24 T4OUT
T1OUT 2
23 R2IN
T2OUT 3
22 R2OUT
R1IN 4
R1OUT 5
7 T1IN
+5V
+5V
20 T5OUT
T2IN 6
19 T4IN
T1IN 7
18 T3IN
GND 8
17 R3OUT
VCC 9
16 R3IN
C1+ 10
15 V-
V+ 11
14 C2-
C1- 12
13 C2+
T1OUT
2
T2OUT
3
T3OUT
1
T4OUT
24
T5OUT
20
400kΩ
6 T2IN
21 T5IN
MAX237
T1
T2
400kΩ
TTL/CMOS
INPUTS
18 T3IN
+5V
T3
RS-232
OUTPUTS
400kΩ
19 T4IN
+5V
T4
400kΩ
21 T5IN
DIP/SO
5 R1OUT
T5
R1
R1IN
4
5kΩ
TTL/CMOS
OUTPUTS
22 R2OUT
R2
R2IN
23
5kΩ
17 R3OUT
R3
R3IN
RS-232
INPUTS
16
5kΩ
GND
8
Figure 15. MAX237 Pin Configuration and Typical Operating Circuit
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Maxim Integrated │ 24
MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
TOP VIEW
1.0µF
10
1.0µF
12
13
1.0µF
14
+5V INPUT
1.0µF
9
VCC
+5V TO +10V
VOLTAGE DOUBLER
C1+
C1C2+
V+
V-
+10V TO -10V
VOLTAGE INVERTER
C2-
11
15
1.0µF
+5V
T2OUT 1
400kΩ
+
22 R3OUT
R2IN 3
18 T2IN
21 T4IN
R2OUT 4
MAX238
20 T4OUT
R1OUT 6
19 T3IN
R1IN 7
18 T2IN
GND 8
17 R4OUT
VCC 9
16 R4IN
C1+ 10
15 V-
V+ 11
14 C2-
C1- 12
13 C2+
T1
+5V
23 R3IN
T1OUT 2
T1IN 5
5 T1IN
24 T3OUT
+5V
TTL/CMOS
INPUTS
19 T3IN
+5V
T1OUT
2
T2OUT
1
400kΩ
T2
RS-232
OUTPUTS
400kΩ
T3
T3OUT
24
T4OUT
20
400kΩ
21 T4IN
6 R1OUT
T4
R1
R1IN
7
5kΩ
DIP/SO
4 R2OUT
R2
TTL/CMOS
OUTPUTS
R2IN
3
RS-232
INPUTS
5kΩ
22 R3OUT
R3
R3IN
23
5kΩ
17 R4OUT
R4
R4IN
16
5kΩ
GND
8
16. MAX238 Pin Configuration and Typical Operating Circuit
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Maxim Integrated │ 25
MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
TOP VIEW
+7.5V TO +13.2V
INPUT
+5V INPUT
1.0µF
5
4
6
1.0µF
7
VCC
C1+
V+
V-
+10V TO -10V
VOLTAGE INVERTER
C1-
8
1.0µF
+5V
400kΩ
R1OUT 1
24 T1IN
+
23 T2IN
GND 3
22 R2OUT
21 R2IN
VCC 4
V+ 5
+5V
24 T1IN
R1IN 2
MAX239
19 T1OUT
C- 7
18 R3IN
V- 8
17 R3OUT
R5IN 9
16 T3IN
R5OUT 10
15 N.C.
R4OUT 11
14 EN
R4IN 12
TTL/CMOS
INPUTS
23 T2IN
19
T2OUT
20
T3OUT
13
400kΩ
T2
+5V
16 T3IN
1 R1OUT
RS-232
OUTPUTS
T3
R1
R1IN
2
5kΩ
22 R2OUT
13 T3OUT
DIP/SO
T1OUT
400kΩ
20 T2OUT
C+ 6
T1
R2
R2IN 21
5kΩ
TTL/CMOS
OUTPUTS
17 R3OUT
R3
R3IN 18
RS-232
INPUTS
5kΩ
11 R4OUT
R4
R4IN 12
5kΩ
10 R5OUT
R5
14 EN
GND
R5IN 9
5kΩ
15
N.C.
3
Figure 17. MAX239 Pin Configuration and Typical Operating Circuit
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Maxim Integrated │ 26
MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
1.0µF
TOP VIEW
25
19
VCC
+5V TO +10V
VOLTAGE DOUBLER
C1+
1.0µF
27
C128
C2+
1.0µF
29 C2-
+5V INPUT
+5V TO -10V
VOLTAGE INVERTER
+5V
+5V
N.C.
R2IN
N.C.
T2OUT
T1OUT
T3OUT
T4OUT
R3IN
R3OUT
T5IN
N.C.
11
10
9
8
7
6
5
4
3
2
1
12
13
14
15
16
17
18
19
20
21
22
MAX240
44
43
42
41
40
39
38
37
36
35
34
N.C.
SHDN
EN
T5OUT
R4IN
R4OUT
T4IN
T3IN
R5OUT
R5IN
N.C.
T2
T3
2 T5IN
16 R1OUT
N.C.
N.C.
C1+
V+
C1C2+
C2
VN.C.
N.C.
N.C.
T1OUT
7
T2OUT
8
T3OUT
6
T4OUT
5
T5OUT
41
R1IN
17
RS-232
OUTPUTS
400kΩ
38 T4IN
+5V
1.0µF
400kΩ
37 T3IN
+5V
30
400kΩ
T4
400kΩ
T5
R1
5kΩ
13 R2OUT
R2
R2IN 10
5kΩ
23
24
25
26
27
28
29
30
31
32
33
N.C.
R2OUT
T2IN
T1IN
R1OUT
R1IN
GND
VCC
N.C.
N.C.
N.C.
+
T1
14 T2IN
+5V
V-
1.0µF
400kΩ
15 T1IN
TTL/CMOS
INPUTS
V+
26
TTL/CMOS
OUTPUTS
Plastic FP
3 R3OUT
R3
R3IN 4
5kΩ
39 R4OUT
R4
RS-232
INPUTS
R4IN 40
5kΩ
36 R5OUT
42 EN
R5
R5IN 35
5kΩ
GND
SHDN 43
18
Figure 18. MAX240 Pin Configuration and Typical Operating Circuit
www.maximintegrated.com
Maxim Integrated │ 27
MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
TOP VIEW
0.1µF
1
0.1µF
C1+ 1
+
V+ 2
15 GND
14 T1OUT
C2+ 4
4
16 VCC
C1- 3
MAX243
0.1µF
C2+
C2-
16
VCC
+5V TO +10V
VOLTAGE DOUBLER
11 T1IN
T2OUT 7
10 T2IN
9
+10V
6
-10V
0.1µF
T1OUT 14
+5V
TTL/CMOS
INPUTS
RS-232
OUTPUTS
400kΩ
T2OUT 7
10 T2IN
R2OUT
R1IN 13
12 R1OUT
TTL/CMOS
OUTPUTS
5kΩ
9 R2OUT
R1 OUTPUT
HIGH
HIGH
LOW
V-
2
400kΩ
11 T1IN
DIP/SO
RECEIVER INPUT
≤ -3V
OPEN
≥ +3V
V+
+10V TO -10V
VOLTAGE INVERTER
13 R1IN
V- 6
R2IN 8
5
C1-
0.1µF
+5V
12 R1OUT
C2- 5
3
C1+
+5V INPUT
R2 OUTPUT
HIGH
LOW
LOW
RS-232
INPUTS
R2IN 8
5kΩ
GND
15
Figure 19. MAX243 Pin Configuration and Typical Operating Circuit
www.maximintegrated.com
Maxim Integrated │ 28
MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
+5V
TOP VIEW
1µF
1µF
20
VCC
+5V TO +10V VOLTAGE DOUBLER
2
1
1µF
RB5IN
TA1OUT
3
TB4OUT
TA2OUT
4
TB3OUT
TA3OUT
5
TB2OUT
TA4OUT
6
TB1OUT
RA4IN
RA5IN
21
1µF
44 43 42 41 40
RA3IN
7
39 RB4IN
RA2IN
8
38 RB3IN
RA1IN
9
37 RB2IN
RA1OUT
10
36 RB1IN
RA2OUT
11
35 RB1OUT
RA3OUT
12
RA4OUT
13
33 RB3OUT
RA5OUT
14
32 RB4OUT
TA1IN
15
31 RB5OUT
TA2IN
16
30 TB1IN
TA3IN
17
29 TB2IN
MAX244
TB3IN
TB4IN
V-
C2-
C2+
C1-
V+
C1+
VCC
19 20 21 22 23 24 25 26 27 28
GND
TA4IN
34 RB2OUT
PLCC
+5V
400kΩ
15 TA1IN
2 TA2OUT
400kΩ
26
V- 1µF
400kΩ
17 TA3IN
4 TA4OUT
18 TA4IN
+5V
9 RA1IN
TB3OUT 42
TB4OUT 41
TB4IN 27
RB1IN 36
5kΩ
5kΩ
10 RA1OUT
RB1OUT 35
RB2IN 37
5kΩ
5kΩ
11 RA2OUT
RB2OUT 34
7 RA3IN
RB3IN 38
5kΩ
5kΩ
12 RA3OUT
RB3OUT 33
6 RA4IN
RB4IN 39
5kΩ
5kΩ
13 RA4OUT
RB4OUT 32
5 RA5IN
RB5IN 40
5kΩ
5kΩ
14 RA5OUT
TB2OUT 43
TB3IN 28
+5V
400kΩ
TB1OUT 44
TB2IN 29
+5V
+5V
22
TB1IN 30
+5V
+5V
16 TA2IN
3 TA3OUT
+5V
8 RA2IN
MAX249 FUNCTIONAL DESCRIPTION
10 RECEIVERS
5 A-SIDE RECEIVERS
5 B-SIDE RECEIVERS
8 TRANSMITTERS
4 A-SIDE TRANSMITTERS
4 B-SIDE TRANSMITTERS
NO CONTROL PINS
V+
+10V TO -10V VOLTAGE INVERTER
2 TA1OUT
+
18
C1+
23 C124
C2+
25 C2-
GND
19
RB5OUT 31
Figure 20. MAX244 Pin Configuration and Typical Operating Circuit
www.maximintegrated.com
Maxim Integrated │ 29
MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
+5V
TOP VIEW
1µF
ENR
1
+
40
VCC
TA1IN
2
39
ENT
TA2IN
3
38
TB1IN
TA3IN
4
37
TB2IN
TA4IN
5
36
TB3IN
RA5OUT
6
35
TB4IN
RA4OUT
7
34
RB5OUT
RA3OUT
8
33
RB4OUT
RA2OUT
9
32
RB3OUT
RA1OUT
10
31
RB2OUT
RA1IN
11
30
RB1OUT
RA2IN
12
29
RB1IN
RA3IN
13
28
RB2IN
RA4IN
14
27
RB3IN
RA5IN
15
26
RB4IN
TA1OUT
16
25
RB5IN
TA2OUT
17
24
TB1OUT
TA3OUT
18
23
TB2OUT
TA4OUT
19
22
TB3OUT
GND
20
21
TB4OUT
MAX245
16 TA1OUT
+5V
40
VCC
17 TA2OUT
+5V
+5V
TB2OUT 23
400kΩ
3 TA2IN
18 TA3OUT
TB2IN 37
+5V
+5V
TB3OUT 22
400kΩ
TB3IN 36
4 TA3IN
19 TA4OUT
5 TA4IN
+5V
+5V
400kΩ
TB4OUT 21
TB4IN 35
1 ENR
ENT 39
11 RA1IN
RB1IN 29
5kΩ
5kΩ
10 RA1OUT
RB1OUT 30
12 RA2IN
RB2IN 28
5kΩ
5kΩ
RB2OUT 31
13 RA3IN
RB3IN 27
5kΩ
5kΩ
MAX245 FUNCTIONAL DESCRIPTION
10 RECEIVERS
5 A-SIDE RECEIVERS (RA5 ALWAYS ACTIVE)
5 B-SIDE RECEIVERS (RB5 ALWAYS ACTIVE)
8 TRANSMITTTERS
4 A-SIDE TRANSMITTERS
2 CONTROL PINS
1 RECEIVER ENABLE (ENR)
1 TRANSMITTER ENABLE (ENT)
TB1OUT 24
TB1IN 38
2 TA1IN
9 RA2OUT
DIP
+5V
400kΩ
8 RA3OUT
RB3OUT 32
14 RA4IN
RB4IN 26
5kΩ
5kΩ
7 RA4OUT
RB4OUT 33
15 RA5IN
RB5IN 25
5kΩ
5kΩ
6 RA5OUT
RB5OUT 34
GND
20
Figure 21. MAX245 Pin Configuration and Typical Operating Circuit
www.maximintegrated.com
Maxim Integrated │ 30
MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
+5V
TOP VIEW
1µF
+
40
VCC
2
39
ENB
TA2IN
3
38
TB1IN
TA3IN
4
37
TB2IN
TA4IN
5
36
TB3IN
RA5OUT
6
35
TB4IN
RA4OUT
7
34
RB5OUT
RA3OUT
8
33
RB4OUT
ENA
1
TA1IN
MAX246
RA2OUT
9
32
RB3OUT
RA1OUT
10
31
RB2OUT
RA1IN
11
30
RB1OUT
RA2IN
12
29
RB1IN
RA3IN
13
28
RB2IN
RA4IN
14
27
RB3IN
RA5IN
15
26
RB4IN
TA1OUT
16
25
RB5IN
TA2OUT
17
24
TB1OUT
TA3OUT
18
23
TB2OUT
TA4OUT
19
22
TB3OUT
GND
20
21
TB4OUT
DIP
MAX246 FUNCTIONAL DESCRIPTION
10 RECEIVERS
5 A-SIDE RECEIVERS (RA5 ALWAYS ACTIVE)
5 B-SIDE RECEIVERS (RB5 ALWAYS ACTIVE)
8 TRANSMITTERS
4 A-SIDE TRANSMITTERS
4 B-SIDE TRANSMITTERS
2 CONTROL PINS
ENABLE A-SIDE (ENA)
ENABLE B-SIDE (ENB)
16 TA1OUT
40
VCC
+5V
+5V
TB1OUT 24
400kΩ
TB1IN 38
2 TA1IN
17 TA2OUT
+5V
+5V
TB2OUT 23
400kΩ
TB2IN 37
3 TA2IN
18 TA3OUT
4 TA3IN
19 TA4OUT
+5V
+5V
400kΩ
+5V
+5V
TB3OUT 22
TB3IN 36
TB4OUT 21
400kΩ
5 TA4IN
TB4IN 35
1 ENA
ENB 39
RB1IN 29
11 RA1IN
5kΩ
5kΩ
RB1OUT 30
10 RA1OUT
RB2IN 28
12 RA2IN
5kΩ
5kΩ
9 RA2OUT
RB2OUT 31
RB3IN 27
13 RA3IN
5kΩ
5kΩ
RB3OUT 32
8 RA3OUT
RB4IN 26
14 RA4IN
5kΩ
5kΩ
7 RA4OUT
RB4OUT 33
RB5IN 25
15 RA5IN
5kΩ
6 RA5OUT
5kΩ
GND
20
RB5OUT 34
Figure 22. MAX246 Pin Configuration and Typical Operating Circuit
www.maximintegrated.com
Maxim Integrated │ 31
MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
+5V
TOP VIEW
1µF
+
40
VCC
2
39
ENTB
TA2IN
3
38
TB1IN
TA3IN
4
37
TB2IN
TA4IN
5
36
TB3IN
RB5OUT
6
35
TB4IN
RA4OUT
7
34
RB4OUT
RA3OUT
8
33
RB3OUT
RA2OUT
9
32
RB2OUT
RA1OUT
10
31
RB1OUT
ENRA
11
30
ENRB
RA1IN
12
29
RB1IN
RA2IN
13
28
RB2IN
RA3IN
14
27
RB3IN
RA4IN
15
26
RB4IN
TA1OUT
16
25
RB5IN
TA2OUT
17
24
TB1OUT
TA3OUT
18
23
TB2OUT
TA4OUT
19
22
TB3OUT
GND
20
21
TB4OUT
ENTA
1
TA1IN
MAX247
DIP
MAX247 FUNCTIONAL DESCRIPTION
9 RECEIVERS
4 A-SIDE RECEIVERS
5 B-SIDE RECEIVERS (RB5 ALWAYS ACTIVE)
8 TRANSMITTERS
4 A-SIDE TRANSMITTERS
4 B-SIDE TRANSMITTERS
4 CONTROL PINS
ENABLE RECEIVER A-SIDE (ENRA)
ENABLE RECEIVER B-SIDE (ENRB)
ENABLE RECEIVER A-SIDE (ENTA)
ENABLE RECEIVER B-SIDE (ENTB)
1 ENTA
16 TA1OUT
40
VCC
+5V
+5V
ENTB 39
TB1OUT 24
400kΩ
2 TA1IN
17 TA2OUT
TB1IN 38
+5V
+5V
TB2OUT 23
400kΩ
TB2IN 37
3 TA2IN
18 TA3OUT
4 TA3IN
19 TA4OUT
+5V
+5V
400kΩ
+5V
+5V
TB3OUT 22
TB3IN 36
TB4OUT 21
400kΩ
5 TA4IN
TB4IN 35
6 RB5OUT
RB5IN 25
5kΩ
12 RA1IN
RB1IN 29
5kΩ
5kΩ
10 RA1OUT
RB1OUT 31
13 RA2IN
RB2IN 28
5kΩ
5kΩ
9 RA2OUT
RB2OUT 32
14 RA3IN
RB3IN 27
5kΩ
5kΩ
8 RA3OUT
RB3OUT 33
15 RA4IN
RB4IN 26
5kΩ
5kΩ
7 RA4OUT
11 ENRA
RB4OUT 34
GND
20
ENRB 30
Figure 23. MAX247 Pin Configuration and Typical Operating Circuit
www.maximintegrated.com
Maxim Integrated │ 32
MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
TOP VIEW
+5V
1µF
2
1
1µF
1µF
44 43 42 41 40
RA2IN
7
39 RB3IN
RA1IN
8
38 RB2IN
ENRA
9
37 RB1IN
RA1OUT
10
36 ENRB
RA2OUT
11
35 RB1OUT
RA3OUT
12
RA4OUT
13
33 RB3OUT
TA1IN
14
32 RB4OUT
TA2IN
15
31 TB1IN
TA3IN
16
30 TB2IN
TA4IN
17
29 TB3IN
MAX248
34 RB2OUT
TB4IN
ENTB
V-
C2-
C2+
C1-
V+
C1+
VCC
19 20 21 22 23 24 25 26 27 28
GND
ENTA
C1+
23 C124
C2+
25 C2-
VCC
+5V TO +10V VOLTAGE DOUBLER
PLCC
1 TA1OUT
+5V
+5V
8 RECEIVERS
4 A-SIDE RECEIVERS
4 B-SIDE RECEIVERS
8 TRANSMITTERS
4 A-SIDE TRANSMITTERS
4 B-SIDE TRANSMITTERS
4 CONTROL PINS
ENABLE RECEIVER A-SIDE (ENRA)
ENABLE RECEIVER B-SIDE (ENRB)
ENABLE RECEIVER A-SIDE (ENTA)
ENABLE RECEIVER B-SIDE (ENTB)
V-
22
26
1µF
ENTB 27
TB1OUT 44
400kΩ
TB1IN 31
14 TA1IN
2 TA2OUT
+5V
+5V
TB2OUT 43
400kΩ
15 TA2IN
3 TA3OUT
16 TA3IN
4 TA4OUT
TB2IN 30
+5V
+5V
400kΩ
+5V
+5V
TB3OUT 42
TB3IN 29
TB4OUT 41
400kΩ
17 TA4IN
TB4IN 28
8 RA1IN
RB1IN 37
5kΩ
5kΩ
MAX248 FUNCTIONAL DESCRIPTION
V+
+10V TO -10V VOLTAGE INVERTER
18 ENTA
+
18
20
21
RB4IN
TA1OUT
3
TA4OUT
TA2OUT
4
TB3OUT
TA3OUT
5
TB2OUT
TA4OUT
6
TB1OUT
RA3IN
RA4IN
1µF
10 RA1OUT
RB1OUT 35
7 RA2IN
RB2IN 38
5kΩ
5kΩ
11 RA2OUT
RB2OUT 34
6 RA3IN
RB3IN 39
5kΩ
5kΩ
12 RA3OUT
RB3OUT 33
5 RA4IN
RB4IN 40
5kΩ
5kΩ
13 RA4OUT
9 ENRA
RB4OUT 32
GND
19
ENRB 36
Figure 24. MAX248 Pin Configuration and Typical Operating Circuit
www.maximintegrated.com
Maxim Integrated │ 33
MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
+5V
TOP VIEW
1µF
2
1
1µF
RB4IN
TA1OUT
3
1µF
44 43 42 41 40
+
RA2IN
7
39 RB3IN
8
38 RB2IN
ENRA
9
37 RB1IN
RA1OUT
10
36 ENRB
35 RB1OUT
RA2OUT
11
RA3OUT
12
RA4OUT
13
33 RB3OUT
RA5OUT
14
32 RB4OUT
TA1IN
15
31 RB5OUT
TA2IN
16
30 TB1IN
TA3IN
17
29 TB2IN
MAX249
34 RB2OUT
TB3IN
ENTB
V-
C2-
C2+
C1-
V+
C1+
VCC
19 20 21 22 23 24 25 26 27 28
GND
ENTA
C1+
23 C124
C2+
25 C2-
VCC
+5V TO +10V VOLTAGE DOUBLER
PLCC
1 TA1OUT
+5V
+5V
V-
22
26
1µF
ENTB 27
TB1OUT 44
400kΩ
15 TA1IN
2 TA2OUT
TB1IN 30
+5V
+5V
TB2OUT 43
400kΩ
16 TA2IN
3 TA3OUT
17 TA3IN
TB2IN 29
+5V
+5V
400kΩ
8 RA1IN
TB3IN 28
5kΩ
5kΩ
10 RA1OUT
RB1OUT 35
7 RA2IN
RB2IN 38
5kΩ
11 RA2OUT
RB2OUT 34
6 RA3IN
RB3IN 39
5kΩ
5kΩ
12 RA3OUT
RB3OUT 33
5 RA4IN
RB4IN 40
5kΩ
5kΩ
13 RA4OUT
RB4OUT 32
4 RA5IN
RB5IN 41
5kΩ
5kΩ
14 RA5OUT
9 ENRA
TB3OUT 42
RB1IN 37
5kΩ
MAX249 FUNCTIONAL DESCRIPTION
10 RECEIVERS
5 A-SIDE RECEIVERS
5 B-SIDE RECEIVERS
6 TRANSMITTERS
3 A-SIDE TRANSMITTERS
3 B-SIDE TRANSMITTERS
4 CONTROL PINS
ENABLE RECEIVER A-SIDE (ENRA)
ENABLE RECEIVER B-SIDE (ENRB)
ENABLE RECEIVER A-SIDE (ENTA)
ENABLE RECEIVER B-SIDE (ENTB)
V+
+10V TO -10V VOLTAGE INVERTER
18 ENTA
RA1IN
18
20
21
RB5IN
TA2OUT
4
TB3OUT
TA3OUT
5
TB2OUT
RA5IN
6
TB1OUT
RA3IN
RA4IN
1µF
RB5OUT 31
GND
19
ENRB 36
Figure 25. MAX249 Pin Configuration and Typical Operating Circuit
www.maximintegrated.com
Maxim Integrated │ 34
MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
PART
TEMP RANGE
PIN-PACKAGE
-40°C to +85°C
16 Wide SO
MAX220CPE+
0°C to +70°C
16 Plastic DIP
MAX231EWE+
MAX220CSE+
0°C to +70°C
16 Narrow SO
MAX231EJD
-40°C to +85°C
14 CERDIP
MAX220CWE+
0°C to +70°C
16 Wide SO
MAX231MJD
55°C to +125°C
14 CERDIP
Dice*
MAX232CPE+
0°C to +70°C
16 Plastic DIP
16 Plastic DIP
MAX232CSE+
0°C to +70°C
16 Narrow SO
0°C to +70°C
16 Wide SO
0°C to +70°C
Dice*
MAX220C/D
MAX220EPE+
0°C to +70°C
-40°C to +85°C
MAX220ESE+
-40°C to +85°C
16 Narrow SO
MAX232CWE+
MAX220EWE+
-40°C to +85°C
16 Wide SO
MAX232C/D
MAX220EJE
-40°C to +85°C
16 CERDIP
MAX232EPE+
-40°C to +85°C
16 Plastic DIP
16 CERDIP
MAX232ESE+
-40°C to +85°C
16 Narrow SO
MAX220MJE
MAX222CPN+
55°C to +125°C
0°C to +70°C
18 Plastic DIP
MAX232EWE+
-40°C to +85°C
16 Wide SO
-40°C to +85°C
16 CERDIP
MAX222CWN+
0°C to +70°C
18 Wide SO
MAX232EJE
MAX222C/D
0°C to +70°C
Dice*
MAX232MJE
55°C to +125°C
16 CERDIP
18 Plastic DIP
MAX232MLP+
55°C to +125°C
20 LCC
0°C to +70°C
16 Plastic DIP
MAX222EPN+
-40°C to +85°C
MAX222EWN+
-40°C to +85°C
18 Wide SO
MAX232ACPE+
MAX222EJN
-40°C to +85°C
18 CERDIP
MAX232ACSE+
0°C to +70°C
16 Narrow SO
18 CERDIP
MAX232ACWE+
0°C to +70°C
16 Wide SO
MAX232AC/D
0°C to +70°C
Dice*
MAX222MJN
55°C to +125°C
MAX223CAI+
0°C to +70°C
28 SSOP
MAX223CWI+
0°C to +70°C
28 Wide SO
MAX232AEPE+
-40°C to +85°C
16 Plastic DIP
Dice*
MAX232AESE+
-40°C to +85°C
16 Narrow SO
28 SSOP
MAX232AEWE+
-40°C to +85°C
16 Wide SO
-40°C to +85°C
16 CERDIP
MAX223C/D
0°C to +70°C
MAX223EAI+
-40°C to +85°C
MAX223EWI+
-40°C to +85°C
28 Wide SO
MAX232AEJE
MAX225CWI+
0°C to +70°C
28 Wide SO
MAX232AMJE
55°C to +125°C
16 CERDIP
MAX225EWI+
-40°C to +85°C
28 Wide SO
MAX232AMLP+
55°C to +125°C
20 LCC
MAX233CPP+
0°C to +70°C
20 Plastic DIP
MAX230CPP+
0°C to +70°C
20 Plastic DIP1
MAX230CWP+
0°C to +70°C
20 Wide SO
MAX233EPP+
-40°C to +85°C
20 Plastic DIP
Dice*
MAX233ACPP+
0°C to +70°C
20 Plastic DIP
MAX233ACWP+
0°C to +70°C
20 Wide SO
MAX230C/D
0°C to +70°C
MAX230EPP+
-40°C to +85°C
20 Plastic DIP
MAX230EWP+
-40°C to +85°C
20 Wide SO
MAX233AEPP+
-40°C to +85°C
20 Plastic DIP
-40°C to +85°C
20 Wide SO
MAX230EJP
-40°C to +85°C
20 CERDIP
MAX233AEWP+
MAX230MJP
55°C to +125°C
20 CERDIP
MAX234CPE+
0°C to +70°C
16 Plastic DIP
0°C to +70°C
16 Wide SO
0°C to +70°C
Dice*
MAX231CPD+
0°C to +70°C
14 Plastic DIP
MAX234CWE+
MAX231CWE+
0°C to +70°C
16 Wide SO
MAX234C/D
MAX231CJD
0°C to +70°C
14 CERDIP
MAX234EPE+
MAX231C/D
MAX231EPD+
0°C to +70°C
-40°C to +85°C
www.maximintegrated.com
Dice*
14 Plastic DIP
-40°C to +85°C
16 Plastic DIP
+Denotes a lead(Pb)-free/RoHS-compliant package.
*Contact factory for dice specifications.
Maxim Integrated │ 35
MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
Ordering Information (continued)
PART
TEMP RANGE
PIN-PACKAGE
PART
TEMP RANGE
PIN-PACKAGE
MAX234EWE+
-40°C to +85°C
16 Wide SO
MAX240CMH+
0°C to +70°C
44 Plastic FP
MAX234EJE
-40°C to +85°C
16 CERDIP
MAX240C/D
0°C to +70°C
Dice*
MAX234MJE
55°C to +125°C
16 CERDIP
MAX241CAI+
0°C to +70°C
28 SSOP
MAX235CPG+
0°C to +70°C
24 Wide Plastic DIP
MAX241CWI+
0°C to +70°C
28 Wide SO
MAX235EPG+
-40°C to +85°C
24 Wide Plastic DIP
MAX241C/D
0°C to +70°C
Dice*
MAX235EDG
-40°C to +85°C
24 Ceramic SB
MAX241EAI+
-40°C to +85°C
28 SSOP
MAX235MDG
55°C to +125°C
24 Ceramic SB
MAX241EWI+
-40°C to +85°C
28 Wide SO
MAX236CNG+
0°C to +70°C
24 Narrow Plastic DIP
MAX242CAP+
0°C to +70°C
20 SSOP
MAX236CWG+
0°C to +70°C
24 Wide SO
MAX242CPN+
0°C to +70°C
18 Plastic DIP
MAX236C/D
0°C to +70°C
Dice*
MAX242CWN+
0°C to +70°C
18 Wide SO
MAX236ENG+
-40°C to +85°C
24 Narrow Plastic DIP
MAX242C/D
MAX236EWG+
-40°C to +85°C
24 Wide SO
MAX242EPN+
-40°C to +85°C
18 Plastic DIP
MAX236ERG
-40°C to +85°C
24 Narrow CERDIP
MAX242EWN+
-40°C to +85°C
18 Wide SO
MAX236MRG
55°C to +125°C
24 Narrow CERDIP
MAX242EJN
-40°C to +85°C
18 CERDIP
MAX237CNG+
0°C to +70°C
24 Narrow Plastic DIP
MAX242MJN
55°C to +125°C
18 CERDIP
MAX237CWG+
0°C to +70°C
24 Wide SO
MAX243CPE+
0°C to +70°C
16 Plastic DIP
MAX237C/D
0°C to +70°C
Dice*
MAX243CSE+
0°C to +70°C
16 Narrow SO
24 Narrow Plastic DIP
MAX243CWE+
0°C to +70°C
16 Wide SO
MAX237ENG+
-40°C to +85°C
0°C to +70°C
MAX237EWG+
-40°C to +85°C
24 Wide SO
MAX243C/D
MAX237ERG
-40°C to +85°C
24 Narrow CERDIP
MAX243EPE+
MAX237MRG
55°C to +125°C
24 Narrow CERDIP
MAX243ESE+
-40°C to +85°C
16 Narrow SO
MAX238CNG+
0°C to +70°C
24 Narrow Plastic DIP
MAX243EWE+
-40°C to +85°C
16 Wide SO
MAX238CWG+
0°C to +70°C
24 Wide SO
MAX243EJE
-40°C to +85°C
16 CERDIP
55°C to +125°C
16 CERDIP
MAX238C/D
MAX238ENG+
0°C to +70°C
-40°C to +85°C
Dice*
MAX243MJE
24 Narrow Plastic DIP
MAX244CQH+
0°C to +70°C
Dice*
-40°C to +85°C
Dice*
16 Plastic DIP
0°C to +70°C
44 PLCC
0°C to +70°C
Dice*
MAX238EWG+
-40°C to +85°C
24 Wide SO
MAX244C/D
MAX238ERG
-40°C to +85°C
24 Narrow CERDIP
MAX244EQH+
-40°C to +85°C
MAX238MRG
55°C to +125°C
24 Narrow CERDIP
MAX245CPL+
0°C to +70°C
MAX239CNG+
0°C to +70°C
24 Narrow Plastic DIP
MAX245C/D
MAX239CWG+
0°C to +70°C
24 Wide SO
MAX245EPL+
-40°C to +85°C
40 Plastic DIP
0°C to +70°C
44 PLCC
40 Plastic DIP
Dice*
Dice*
MAX246CPL+
0°C to +70°C
40 Plastic DIP
MAX239ENG+
-40°C to +85°C
24 Narrow Plastic DIP
MAX246C/D
0°C to +70°C
Dice*
MAX239EWG+
-40°C to +85°C
24 Wide SO
MAX246EPL+
MAX239ERG
-40°C to +85°C
24 Narrow CERDIP
MAX239MRG
55°C to +125°C
24 Narrow CERDIP
MAX239C/D
0°C to +70°C
www.maximintegrated.com
-40°C to +85°C
40 Plastic DIP
+Denotes a lead(Pb)-free/RoHS-compliant package.
*Contact factory for dice specifications.
Maxim Integrated │ 36
MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
Ordering Information (continued)
PART
TEMP RANGE
PIN-PACKAGE
MAX247CPL+
0°C to +70°C
40 Plastic DIP
MAX247C/D
0°C to +70°C
Dice*
MAX247EPL+
-40°C to +85°C
MAX248CQH+
0°C to +70°C
40 Plastic DIP
44 PLCC
MAX248C/D
0°C to +70°C
Dice*
MAX248EQH+
-40°C to +85°C
44 PLCC
MAX249CQH+
0°C to +70°C
44 PLCC
MAX249EQH+
-40°C to +85°C
44 PLCC
+Denotes a lead(Pb)-free/RoHS-compliant package.
*Contact factory for dice specifications.
Selection Table
PART
NUMBER
NO. OF
POWER
RS-232
SUPPLY
Drivers/
(V)
Rx
SHDN
NOMINAL
Rx
DATA
NO. OF
AND
CAPACITOR
ACTIVE RATE
EXT CAP
THREEVALUE (µF)
IN SHDN (kbps)
STATE
MAX220
+5
2/2
4
0.047, 0.33
No
No
MAX222
MAX223
MAX225
MAX230
MAX231
+5
+5
+5
+5
+5 and
+7.5 to
+5
+5
+5
+5
2/2
4/5
5/5
5/0
2/2
4
4
0
4
2
0.1
1.0, 0.1
—
1.0, 0.1
1.0, 0.1
Yes
Yes
Yes
Yes
No
No
Yes
Yes
No
No
2/2
2/2
2/2
2/2
4
4
0
0
1.0, 0.1
0.1
—
—
No
No
No
No
No
No
No
No
4/0
5/5
4/3
5/3
4/4
3/5
4
0
4
4
4
2
1.0, 0.1
—
1.0, 0.1
1.0, 0.1
1.0, 0.1
1.0, 0.1
No
Yes
Yes
No
No
No
No
No
No
No
No
No
120
120
120
120
120
120
MAX240
MAX241
+5
+5
+5
+5
+5
+5 and
+7.5 to
+5
+5
5/5
4/5
4
4
1.0
1.0, 0.1
Yes
Yes
No
No
120
120
Replaces 1488
No external caps
Shutdown, three state
Complements IBM PC serial port
Replaces 1488 and 1489
Standard +5/+12V or battery supplies;
single-package solution for IBM PC serial
DIP or flatpack package
Complete IBM PC serial port
MAX242
MAX243
MAX244
MAX245
MAX246
MAX247
MAX248
MAX249
+5
+5
+5
+5
+5
+5
+5
+5
2/2
2/2
8/10
8/10
8/10
8/9
8/8
6/10
4
4
4
0
0
0
4
4
0.1
0.1
1.0
—
—
—
1.0
1.0
Yes
No
No
Yes
Yes
Yes
Yes
Yes
Yes
No
No
Yes
Yes
Yes
Yes
Yes
200
200
120
120
120
120
120
120
Separate shutdown and enable
Open-line detection simplifies cabling
High slew rate
High slew rate, int. caps, two shutdown
High slew rate, int. caps, three shutdown
High slew rate, int. caps, nine operating
High slew rate, selective half-chip enables
Available in quad flatpack package
MAX232
MAX232A
MAX233
MAX233A
MAX234
MAX235
MAX236
MAX237
MAX238
MAX239
www.maximintegrated.com
120
FEATURES
Ultra-low-power, industry-standard pinout
Low-power shutdown
MAX241 and receivers active in shutdown
Available in SO
5 drivers with shutdown
Standard +5/+12V or battery supplies;
same functions as MAX232
120 (64) Industry standard
Higher slew rate, small caps
200
No external caps
120
No external caps, high slew rate
200
200
120
120
120
120
Maxim Integrated │ 37
MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
Package Information
For the latest package outline information and land patterns (footprints), go to www.maximintegrated.com/packages. Note that a “+”,
“#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
PACKAGE
TYPE
PACKAGE
CODE
P14+3
16 SO(W)
W16+1
P16+1
16 SO(W)
W16+2
16 PDIP
P16+2
16 SO(W)
W16+3
16 PDIP
P16+3
18 SO(W)
W18+1
18 PDIP
P18+5
20 SO(W)
W20+3
20 PDIP
P20+3
20 SO(W)
W20M+1
20 PDIP
P20M+1
24 SO(W)
W24+2
24 PDIP
N24+3
28 SO(W)
W28+1
24 PDIP
P24M+1
28 PDIP
P28+2
40 PDIP
P40+1
20 LCC
L20+3
40 PDIP
P40M+2
20 SSOP
A20+1
14 CERDIP
J14-3
24 SSOP
A24+2
16 CERDIP
J16-3
18 CERDIP
J18-2
PACKAGE
TYPE
PACKAGE
CODE
14 PDIP
16 PDIP
OUTLINE
NO.
LAND
PATTERN NO.
21-0043
—
21-0044
21-0045
28 SO(W)
W28+2
28 SO(W)
W28M+1
28 SSOP
A28+1
16 TSSOP
U16+1
OUTLINE
NO.
LAND
PATTERN NO.
90-0107
90-0181
21-0042
90-0108
90-0182
90-0109
21-0658
90-0177
90-0094
90-0110
21-0658
90-0095
90-0117
20 CERDIP
J20-2
16 FPCK
F16-3
21-0013
—
24 CERDIP
R24-4
44 MQFP
M44+5
21-0826
90-0169
16 SO(N)
S16+3
44 PLCC
Q44+1
16 SO(N)
S16+5
44 PLCC
Q44+2
21-0049
90-0236
21-0041
90-0097
Terminal Connections
01,03,05 01,03,05
J16
L20
02
02
04
04
J18
L20
J18
L20
01,03,05 01,03,05
J16
02
02
04
04
L20
J18
L20
J18
L20
1
C1+
NC
NC
NC
EN
EN
11
T1IN
NC
T2IN
NC
T2IN
NC
2
V+
C1+
C1+
C1+
C1+
C1+
12
R1OUT
R2OUT
T1IN
R2OUT
T1IN
R2OUT
3
C1-
V+
V+
V+
V+
V+
13
R1IN
T2IN
R1OUT
T2IN
R1OUT
T2IN
4
C2+
C1-
C1-
C1-
C1-
C1-
14
T1OUT
T1IN
R1IN
T1IN
R1IN
T1IN
5
C2-
C2+
C2+
C2+
C2+
C2+
15
GND
R1OUT
T1OUT
R1OUT
T1OUT
R1OUT
6
V-
NC
C2-
NC
C2-
NC
16
VCC
NC
GND
R1IN
GND
R1IN
7
T2OUT
C2-
V-
C2-
V-
C2-
17
R1IN
VCC
T1OUT
VCC
T1OUT
8
R2IN
V-
T2OUT
V-
T2OUT
V-
18
T1OUT
SHND
GND
SHND
GND
9
R2OUT
T2OUT
R2IN
T2OUT
R2IN
T2OUT
19
GND
VCC
VCC
10
T2IN
R2IN
R2OUT
R2IN
R2OUT
R2IN
20
VCC
SHND
SHND
www.maximintegrated.com
Maxim Integrated │ 38
MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
CHANGED
15
1/06
Added part information to the lead temperature in the Absolute Maximum Ratings
sections
16
7/10
Changed multiple packages to lead-free versions; updated/added notes 3, 4, 5, 7, and 8
to the Electrical Characteristics table; removed incorrect subscripting from all pin names
in the Electrical Characteristics table and Pin Configurations
17
1/15
Updated General Description and Benefits and Features sections
1
18
5/19
Add Terminal Connections table
38
DESCRIPTION
2, 5, 8
1, 2–9, 17–36
For pricing, delivery, and ordering information, please visit Maxim Integrated’s online storefront at https://www.maximintegrated.com/en/storefront/storefront.html.
Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses
are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits)
shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance.
Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc.
© 2019 Maxim Integrated Products, Inc. │ 39
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