Datasheet

*These pins have an active positive feedback resistor internal to the MAX3237E, allowing unused inputs to be left unconnected.
PIN
NAME FUNCTION
MAX3222E MAX3232E
MAX3237E
MAX3241E
MAX3246E
TQFN
SO/
DIP
TSSOP/
SSOP
TQFN
SO/DIP/
SSOP/
16-PIN
TSSOP
20-PIN
TSSOP
SSOP/
SO/
TSSOP
TQFN
19 1 1 — — — 13* 23 22 B3 EN
Receiver Enable. Active
low.
1 2 2 16 1 2 28 28 28 F3 C1+
Positive Terminal
of Voltage-Doubler
Charge-Pump Capacitor
20 3 3 15 2 3 27 27 27 F1 V+
+5.5V Generated by the
Charge Pump
2 4 4 1 3 4 25 24 23 F4 C1-
Negative Terminal
of Voltage-Doubler
Charge-Pump Capacitor
3 5 5 2 4 5 1 1 29 E1 C2+
Positive Terminal of
Inverting Charge-Pump
Capacitor
4 6 6 3 5 6 3 2 30 D1 C2-
Negative Terminal of
Inverting Charge-Pump
Capacitor
5 7 7 4 6 7 4 3 31 C1 V-
-5.5V Generated by the
Charge Pump
6, 15
8,
15
8, 17
5,
12
7, 14 8, 17
5, 6, 7, 10,
12
9, 10,
11
6, 7,
8
F6, E6, D6 T_OUT
RS-232 Transmitter
Outputs
7, 14
9,
14
9, 16 6, 11 8, 13 9, 16 8, 9, 11 4–8 1–5
A4, A5, A6,
B6, C6
R_IN RS-232 Receiver Inputs
8, 13
10,
13
10, 15 7, 10 9, 12 12, 15 18, 20, 21 15–19
13,
14,
15,
17,
18
C2, B1, A1,
A2, A3
R_OUT
TTL/CMOS Receiver
Outputs
10, 11
11,
12
12, 13 8, 9 10, 11 13, 14
17*, 19*,
22*, 23*,
24*
12, 13,
14
10,
11, 12
E3, E2, D2 T_IN
TTL/CMOS Transmitter
Inputs
www.maximintegrated.com
Maxim Integrated │ 7
MAX3222E/MAX3232E/
MAX3237E/MAX3241E/
MAX3246E
±15kV ESD-Protected, Down to 10nA,
3.0V to 5.5V, Up to 1Mbps,
True RS-232 Transceivers
Pin Description