![](http://datasheet.mmic.net.cn/Maxim-Integrated-Products/MAX3225EEUP_datasheet_98217/MAX3225EEUP_7.png)
±15kV ESD-Protected, 1A, 1Mbps, 3.0V to 5.5V,
RS-232 Transceivers with AutoShutdown Plus
______________________________________________________________ Pin Description
PIN
MAX3224E
MAX3225E
MAX3226E
MAX3227E
TQFN
DIP/
SSOP/
TSSOP
TQFN
SSOP/
TSSOP
MAX3244E
MAX3245E
SO/ SSOP/ TSSOP
MAX3245E
TQFN
NAME
FUNCTION
19
1
14
1
—
READY
Ready to Transmit Output,
active-high. READY is
enabled high when V- goes
below -4V and the device is
ready to transmit.
1
2
16
2
28
31
C1+
Positive Terminal of Voltage-
Doubler Charge-Pump
Capacitor
20
3
15
3
27
30
V+
+5.5V generated by the
charge pump
2
4
1
4
24
26
C1-
Negative Terminal of Voltage-
Doubler Charge-Pump
Capacitor
3
5
2
5
1
33
C2+
Positive Terminal of Inverting
Charge-Pump Capacitor
4
6
3
6
2
34
C2-
Negative Terminal of
Inverting Charge-Pump
Capacitor
5
7
4
7
3
35
V-
-5.5V Generated by the
Charge Pump
6, 15
8, 17
10
13
9, 10, 11
7, 8, 9
T_OUT
RS-232 Transmitter Outputs
7, 14
9, 16
5
8
4-8
1-5
R_IN
RS-232 Receiver Inputs
8, 13
10, 15
6
9
15-19
15, 16, 17,
19, 20
R_OUT
TTL/CMOS Receiver Outputs
9
11
7
10
21
23
INVALID
Valid Signal Detector Output,
active low. A logic high
indicates that a valid RS-232
level is present on a receiver
input.
10, 11
12, 13
8
11
12-14
11, 12, 13
T_IN
TTL/CMOS Transmitter Inputs
Maxim Integrated
7
MAX3224E/MAX3225E/
MAX3226E/MAX3227E/MAX3244E/MAX3245E