MAX13234E Datasheet, PDF (9/16 Pages) Maxim Integrated Products – 3Mbps RS-232 Transceivers with Low-Voltage Interface

3Mbps RS-232 Transceivers with
Low-Voltage Interface
PIN
MAX13234E/
MAX13235E
TSSOP TQFN-EP
MAX13236E/
MAX13237E
TQFN-EP
1
19
14
2
1
16
3
20
15
4
2
1
5
3
2
6
4
3
7
5
4
8
6
—
—
—
5
9
7
—
—
—
6
10
8
—
11
9
7
—
—
8
12
10
—
13
11
—
14
12
9
15
13
—
—
—
10
16
14
—
17
15
—
18
16
11
19
17
12
20
18
13
—
—
—
Pin Descriptions
NAME
FUNCTION
READY
C1+
V+
C1-
C2+
C2-
V-
T2OUT
RIN
R2IN
ROUT
R2OUT
V_L
TIN
T2IN
T1IN
FORCEON
R1OUT
TOUT
R1IN
T1OUT
GND
V_CC
FORCEOFF
EP
Ready to Transmit Output, Active-High. READY is enabled
high when V- goes below -4V and the device is ready to
transmit.
Positive Terminal of the Voltage Doubler Charge-Pump
Capacitor
+5.5V Generated by the Charge Pump
Negative Terminal of the Voltage Doubler Charge-Pump
Capacitor
Positive Terminal of the Inverting Charge-Pump Capacitor
Negative Terminal of the Inverting Charge-Pump Capacitor
-5.5V Generated by the Charge Pump
RS-232 Transmitter Output 2
RS-232 Receiver Input
RS-232 Receiver Input 2
CMOS Receiver Output. V_L referred logic.
CMOS Receiver Output 2. V_L referred logic.
Logic-Level Supply. All CMOS inputs and outputs are related
to this supply.
CMOS Transmitter Input. V_L referred logic.
CMOS Transmitter Input 2. V_L referred logic.
CMOS Transmitter Input 1. V_L referred logic.
FORCEON Input, Active-High. V_L referenced logic. Drive
FORCEON high to override automatic circuitry keeping
transmitters on (FORCEOFF must be high).
See Table 1.
CMOS Receiver Output 1. V_L referred logic.
RS-232 Transmitter Output
RS-232 Receiver Input 1
RS-232 Transmitter Output 1
Ground
+3V to +5.5V Supply Voltage
FORCEOFF Input, Active-Low. V_L referenced logic. Drive
FORCEOFF low to shut down transmitters and on-board
charge pumps. All receiver and transmitter outputs are tri-
stated. This overrides all automatic circuitry and FORCEON
(Table 1).
Exposed Pad. Connect EP to GND or leave unconnected.
_______________________________________________________________________________________ 9