±15kV ESD-Protected, Down to 10nA, 3.0V to 5.5V,
Up to 1Mbps, True RS-232 Transceivers
MAX3222E/MAX3232E/MAX3237E/MAX3241E
Typical Operating Characteristics (continued)
(V
CC
= +3.3V, 250kbps data rate, 0.1µF capacitors, all transmitters loaded with 3kΩ and C
L
, T
A
= +25°C, unless otherwise noted.)
MAX3237E
TRANSMITTER OUTPUT VOLTAGE vs.
SUPPLY VOLTAGE (MBAUD = GND)
6
5
4
3
2
1
0
-1
-2
-3
-4
-5
-6
2.0
MAX3237E toc13
MAX3237E
SUPPLY CURRENT vs.
SUPPLY VOLTAGE (MBAUD = GND)
MAX3237E toc14
50
TRANSMITTER OUTPUT VOLTAGE (V)
V
OUT
+
40
SUPPLY CURRENT (mA)
1 TRANSMITTER AT 250kbps
4 TRANSMITTERS AT 15.6kbps
ALL TRANSMITTERS LOADED
WITH 3kΩ +1000pF
30
20
1 TRANSMITTER AT 250kbps
4 TRANSMITTERS AT 15.6kbps
ALL TRANSMITTERS LOADED
WITH 3kΩ AND 1000pF
2.0
2.5
3.0
3.5
4.0
4.5
5.0
V
OUT-
10
0
2.5
3.0
3.5
4.0
4.5
5.0
SUPPLY VOLTAGE (V)
SUPPLY VOLTAGE (V)
Pin Description
PIN
MAX3222E
SO/DIP
1
2
TSSOP/
SSOP
1
2
MAX3232E
SO/DIP
—
1
TSSOP/
SSOP
—
2
MAX3237E
SSOP/SO
13*
28
23
28
QFN
22
28
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
TTL/CMOS Transmitter Inputs
MAX3241E
NAME
FUNCTION
3
3
2
3
27
27
27
V+
4
4
3
4
25
24
23
C1-
5
6
7
8, 15
9, 14
10, 13
11, 12
5
6
7
8, 17
9, 16
10, 15
12, 13
4
5
6
7, 14
8, 13
9, 12
10, 11
5
6
7
8, 17
9, 16
12, 15
13, 14
1
3
4
5, 6, 7, 10,
12
8, 9, 11
18, 20, 21
17*, 19*,
22*, 23*, 24*
1
2
3
9, 10,
11
4–8
15–19
12, 13,
14
29
30
31
6, 7, 8
1–5
13, 14, 15,
17, 18
10, 11,
12
C2+
C2-
V-
T_OUT
R_IN
R_OUT
T_IN
6
_______________________________________________________________________________________
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
