3.0V to 5.5V, Low-Power, up to 1Mbps, True RS-232
Transceivers Using Four 0.1µF External Capacitors
MAX3222/MAX3232/MAX3237/MAX3241
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)
3.3
5
MAX32_ _
V
CC
SUPPLY
VOLTAGE
(V)
3.3
5
COMPATIBILITY
Compatible with all CMOS
families.
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
C1
0.1µF
2 C1+
4
5
C2
0.1µF
6
C1-
17
V
CC
V+
3
C3
*
0.1µF
7
C4
0.1µF
0.1µF
0.1µF
+3.3V
0.1µF
1 C1+
3
4
5
C1-
C2+
C2-
T1OUT 14
RS-232
OUTPUTS
10 T2IN
T2OUT 7
16
V
CC
V+
2
C3
*
0.1µF
6
C4
0.1µF
MAX3222
C2+
C2-
V-
MAX3232
V-
12 T1IN
TTL/CMOS
INPUTS
11 T2IN
T1OUT 15
RS-232
OUTPUTS
T2OUT 8
TTL/CMOS
INPUTS
11 T1IN
13 R1OUT
TTL/CMOS
OUTPUTS
10 R2OUT
1
EN
GND
16
R1IN 14
5k
R2IN 9
5k
SHDN
18
RS-232
INPUTS
TTL/CMOS
OUTPUTS
12 R1OUT
R1IN 13
5k
RS-232
INPUTS
9 R2OUT
R2IN 8
5k
GND
15
PIN NUMBERS REFER TO DIP/SO PACKAGES.
*
C3 CAN BE RETURNED TO EITHER V
CC
OR GROUND.
SEE TABLE 2 FOR CAPACITOR SELECTION
*
C3 CAN BE RETURNED TO EITHER V
CC
OR GROUND.
12
______________________________________________________________________________________
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
