MAX3222/MAX3232/MAX3237/MAX3241
3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232
Transceivers Using Four 0.1µF External Capacitors
Interconnection with 3V and 5V Logic
The MAX3222/MAX3232/MAX3237/MAX3241 can
directly interface with various 5V logic families, includ-
ing ACT and HCT CMOS. See Table 3 for more informa-
tion 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
Compatible with all CMOS
families.
3.3
5
3.3
5
Compatible with all TTL
and CMOS-logic families.
Compatible with ACT and
HCT CMOS, and with TTL.
Incompatible with AC, HC,
and CD4000 CMOS.
5
3.3
__________________________________________________Typical Operating Circuits
+3.3V
0.1μF
+3.3V
0.1μF
17
16
V
V
CC
CC
3
7
2
4
5
6
2
6
1
3
4
5
C1+
C1+
V+
V+
C1
0.1μF
C3*
C3*
0.1μF
0.1μF
0.1μF
0.1μF
C1-
C2+
C1-
C2+
MAX3222
MAX3232
V-
V-
C2
0.1μF
C4
0.1μF
C4
0.1μF
C2-
C2-
12
T1OUT
T1IN
15
8
11
T1OUT
T1IN
14
7
TTL/CMOS
INPUTS
RS-232
OUTPUTS
TTL/CMOS
INPUTS
RS-232
OUTPUTS
T2IN
T2OUT
R1IN
11
T2IN
T2OUT
R1IN
10
14
9
13 R1OUT
10 R2OUT
13
8
12 R1OUT
TTL/CMOS
OUTPUTS
TTL/CMOS
OUTPUTS
RS-232
INPUTS
5kΩ
5kΩ
RS-232
INPUTS
R2IN
9
R2OUT
R2IN
5kΩ
5kΩ
EN
1
18
SHDN
GND
16
GND
15
PIN NUMBERS REFER TO DIP/SO PACKAGES.
* C3 CAN BE RETURNED TO EITHER V OR GROUND.
* C3 CAN BE RETURNED TO EITHER V OR GROUND.
CC
CC
SEE TABLE 2 FOR CAPACITOR SELECTION
12
Maxim Integrated
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
