3.0V to 5.5V, Low -Pow e r, up to 1Mbps , True RS-232
Tra ns c e ive rs Us ing Four 0.1µF Exte rna l Ca pa c itors
______________________________________________________________P in De s c rip t io n
PIN
MAX3222
NAME
FUNCTION
MAX3232
MAX3237
MAX3241
DIP/SO
SSOP
1
2
3
4
1
—
1
13
28
27
25
23
28
27
24
Receiver Enable. Active low.
EN
C1+
V+
Positive Terminal of Voltage-Doubler Charge-Pump
Capacitor
2
3
4
2
+5.5V Generated by the Charge Pump
Negative Terminal of Voltage-Doubler Charge-Pump
Capacitor
3
C1-
Positive Terminal of Inverting Charge-Pump
Capacitor
5
5
4
1
1
C2+
Negative Terminal of Inverting Charge-Pump
Capacitor
6
7
6
7
5
6
3
4
2
3
C2-
V-
-5.5V Generated by the Charge Pump
RS-232 Transmitter Outputs
5, 6, 7,
10, 12
8, 15
8, 17
7, 14
9, 10, 11
T_OUT
9, 14
9, 16
8, 13
9, 12
8, 9, 11
4–8
R_IN
RS-232 Receiver Inputs
10, 13
10, 15
18, 20, 21
15–19
R_OUT
TTL/CMOS Receiver Outputs
17, 19, 22,
23, 24
11, 12
12, 13
10, 11
12, 13, 14
T_IN
GND
TTL/CMOS Transmitter Inputs
16
17
18
—
18
19
15
16
—
—
2
25
26
22
—
Ground
26
14
—
V
CC
+3.0V to +5.5V Supply Voltage
Shutdown Control. Active low.
No Connection
20
SHDN
11, 14
N.C.
MegaBaud Control Input. Connect to GND for normal
operation; connect to V for 1Mbps transmission rates.
CC
—
—
—
—
—
—
15
16
—
MBAUD
R_OUTB
7/MAX3241
Noninverting Complementary Receiver Outputs.
Always active.
20, 21
6
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MAXIM [ MAXIM INTEGRATED PRODUCTS ]
