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RS-232 Drivers/Receivers
MAX220–MAX249
General Description
Benefits and Features
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.
Saves Board Space
Applications
of data sheet.
• 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
• 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
C1+ 1
+
16 VCC
V+ 2
C2- 5
C1
15 GND
C1- 3
C2+ 4
1
14 T1OUT
MAX220
MAX232
MAX232A
V- 6
C2
13 R1IN
12 R1OUT
10 T2IN
9
R2IN 8
TTL/CMOS
INPUTS
R2OUT
DIP/SO
CAPACITANCE (μF)
DEVICE
C1 C2 C3 C4 C5
MAX220 0.047 0.33 0.33 0.33 0.33
MAX232
1.0 1.0 1.0 1.0 1.0
MAX232A 0.1 0.1 0.1 0.1 0.1
16
VCC
+5V TO +10V
VOLTAGE DOUBLER
V-
6
-10V
C4
T1OUT 14
+5V
RS-232
OUTPUTS
400kΩ
10 T2IN
T2OUT 7
12 R1OUT
R1IN 13
TTL/CMOS
OUTPUTS
5kΩ
R2IN 8
9 R2OUT
5kΩ
GND
15
19-4323; Rev 17; 1/15
V+ 2 +10V
3 C14
C2+
+10V TO -10V
5 C2- VOLTAGE INVERTER
+5V
400kΩ
11 T1IN
11 T1IN
T2OUT 7
C1+
RS-232
INPUTS
