Datasheet

Interconnection with 3V and 5V Logic
The MAX3222/MAX3232/MAX3237/MAX3241 can
directly interface with various 5V logic families, including
ACT and HCT CMOS. See Table 3 for more information
on possible combinations of interconnections.
Table 3. Logic-Family Compatibility
with Various Supply Voltages
SYSTEM
POWER-
SUPPLY
VOLTAGE
(V)
MAX32_ _
V
CC
SUPPLY
VOLTAGE
(V)
COMPATIBILITY
3.3 3.3
Compatible with all CMOS
families.
5 5
Compatible with all TTL
and CMOS-logic families
5 3.3
Compatible with ACT and
HCT CMOS, and with TTL.
Incompatible with AC, HC,
and CD4000 CMOS.
Typical Operating Circuits
MAX3222
R2OUT10
1
R1OUT13
R2IN
9
18
GND
16
RS-232
OUTPUTS
TTL/CMOS
INPUTS
T2IN
11
T1IN
12
C2-
6
C2+
5
C1-
4
C1+
2
R1IN
14
T2OUT
8
T1OUT
15
V-
7
V+
3
V
CC
17
C1
0.1µF
C2
0.1µF
0.1µF
+3.3V
RS-232
INPUTS
TTL/CMOS
OUTPUTS
5kΩ
5kΩ
EN
SHDN
C3*
0.1µF
C4
0.1µF
PIN NUMBERS REFER TO DIP/SO PACKAGES.
* C3 CAN BE RETURNED TO EITHER V
CC
OR GROUND.
MAX3232
R2OUT9
R1OUT12
R2IN
8
GND
15
RS-232
OUTPUTS
TTL/CMOS
INPUTS
T2IN
10
T1IN
11
C2-
5
C2+
4
C1-
3
C1+
1
R1IN
13
T2OUT
7
T1OUT
14
V-
6
V+
2
V
CC
C4
0.1µF
16
0.1µF
0.1µF
0.1µF
+3.3V
RS-232
INPUTS
TTL/CMOS
OUTPUTS
C3*
0.1µF
5kΩ
5kΩ
* C3 CAN BE RETURNED TO EITHER V
CC
OR GROUND.
SEE TABLE 2 FOR CAPACITOR SELECTION
MAX3222/MAX3232/
MAX3237/MAX3241
3.0V to 5.5V, Low-Power, Up to 1Mbps,
True RS-232 Transceivers
www.maximintegrated.com
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