Datasheet

±15kV ESD-Protected, 1µA, 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 INVAL ID
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