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MAX220–MAX249
+5V-Powered, Multichannel
RS-232 Drivers/Receivers
General Description
Benefits and Features
Saves Board Space
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.
● Integrated Charge Pump Circuitry
• Eliminates the Need for a Bipolar ±12V Supply
• Enables Single Supply Operation from +5V Supply
The MAX225, MAX233, MAX235, and MAX245/MAX246/
MAX247 use no external components and are recommended
for applications where printed circuit board space is critical.
● Integrated Capacitors (MAX223, MAX233, MAX235,
MAX245–MAX247)
Saves Power for Reduced Power Requirements
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.
● 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
C3
TOP VIEW
C5
16
+
V
1
CC
2
C1+
V+
V
1
2
3
4
5
6
7
8
CC
16
15
14
13
12
11
10
9
C1+
C1-
+10V
V+
V-
+5V TO +10V
VOLTAGE DOUBLER
C1
C2
3
4
GND
6
-10V
C4
C2+
+10V TO -10V
C2- VOLTAGE INVERTER
C1-
T1OUT
R1IN
5
C2+
C2-
MAX220
MAX232
MAX232A
+5V
R1OUT
T1IN
400kΩ
T1IN
T1OUT
11
14
V-
+5V
TTL/CMOS
INPUTS
RS-232
T2OUT
T2IN
400kΩ
T2IN
OUTPUTS
T2OUT
R1IN
7
R2OUT
R2IN
10
12
DIP/SO
R1OUT
R2OUT
13
TTL/CMOS
OUTPUTS
RS-232
INPUTS
5kΩ
CAPACITANCE (µF)
DEVICE
MAX220
MAX232
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
8
9
R2IN
5kΩ
MAX232A 0.1 0.1 0.1 0.1 0.1
GND
15
19-4323; Rev 18; 5/19