±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers
Pin Description
PIN
MAX3222E
MAX3232E
TSSOP
—
2
MAX3237E
13*
28
MAX3241E
SSOP/SO
23
28
QFN
22
28
MAX3246E
B3
F3
NAME
FUNCTION
TSSOP/ SO/DIP/
SO/DIP
SSOP
SSOP
1
2
1
2
—
1
MAX3222E/MAX3232E/MAX3237E/MAX3241E
†
/MAX3246E
EN
C1+
Receiver Enable. Active low.
Positive Terminal of Voltage-
Doubler Charge-Pump
Capacitor
+5.5V Generated by the
Charge Pump
Negative Terminal of Voltage-
Doubler Charge-Pump
Capacitor
Positive Terminal of Inverting
Charge-Pump Capacitor
Negative Terminal of Inverting
Charge-Pump Capacitor
-5.5V Generated by the
Charge Pump
RS-232 Transmitter Outputs
RS-232 Receiver Inputs
TTL/CMOS Receiver Outputs
3
3
2
3
27
27
27
F1
V+
4
4
3
4
25
24
23
F4
C1-
5
6
7
8, 15
9, 14
10, 13
5
6
7
8, 17
9, 16
10, 15
4
5
6
7, 14
8, 13
9, 12
5
6
7
8, 17
9, 16
12, 15
1
3
4
5, 6, 7,
10, 12
8, 9, 11
18, 20,
21
17*, 19*,
22*, 23*,
24*
2
26
14*
1
2
3
9, 10,
11
4–8
15–19
12, 13,
14
25
26
22
29
30
31
6, 7,
8
1–5
13, 14,
15, 17,
18
10, 11,
12
24
26
21
9, 16,
25, 32
E1
D1
C1
F6, E6, D6
A4, A5,
A6, B6, C6
C2, B1,
A1, A2, A3
C2+
C2-
V-
T_OUT
R_IN
R_OUT
11, 12
16
17
18
12, 13
18
19
20
10, 11
15
16
—
13, 14
18
19
—
1, 10, 11,
20
E3, E2, D2
F5
F2
B2
C3, D3, B4,
C4, D4, E4,
B5, C5, D5,
E5
T_IN
GND
V
CC
SHDN
N.C.
TTL/CMOS Transmitter Inputs
Ground
+3.0V to +5.5V Supply Voltage
Shutdown Control. Active low.
No Connection. For
MAX3246E, these locations
are not populated with solder
bumps.
MegaBaud Control Input.
Connect to GND for normal
operation; connect to VCC for
1Mbps transmission rates.
Noninverting Complementary
Receiver Outputs. Always
active.
—
11, 14
—
—
—
—
—
—
—
15*
—
—
—
MBAUD
—
—
—
—
16
20, 21
19, 20
—
R_OUTB
*These
pins have an active positive feedback resistor internal to the MAX3237E, allowing unused inputs to be left unconnected.
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7
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
