Datasheet

±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers
* These pins have an active positive feedback resistor internal to the MAX3237E, allowing unused inputs to be left unconnected.
Pin Description
PIN
MAX3222E MAX3232E MAX3241E
TQFN
SO/
DIP
TSSOP/
SSOP
TQFN
SO/DIP/
SSOP/
16-PIN
TSSOP
20-PIN
TSSOP
MAX3237E SSOP/
SO/
TSSOP
TQFN
MAX3246E
NAME FUNCTION
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
Maxim Integrated
7
MAX3222E/MAX3232E/MAX3237E/
MAX3241E/MAX3246E