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112099
FEATURES
Compatible with LT1181A and MAX232A
High data rate - 250 kbits/sec under load
16-pin DIP or SOIC package
20-pin TSSOP package for height restricted
applications
Operate from single +5V power
Meets all EIA-232E and V.28 specifications
Uses small capacitors: 0.1
μF
Optional industrial temperature range
available (-40
°C to +85°C)
ORDERING INFORMATION
DS232A
16-pin DIP
DS232A-N
16-pin DIP (Industrial)
DS232AR
16-pin SOIC (150-Mil)
DS232AR-N 16-pin SOIC (150-Mil) (Industrial)
DS232AS
16-pin SOIC (300-Mil)
DS232AS-N 16-pin SOIC (300-Mil) (Industrial)
DS232AE
20-pin TSSOP
DS232AE-N 20-pin TSSOP (Industrial)
PIN ASSIGNMENT
PIN DESCRIPTION
VCC
- +5-Volt Supply
GND
- Ground
V+
- Positive Supply Output
V-
- Negative Supply Output
T1IN, T2IN
- RS-232 Driver Inputs
T1OUT, T2OUT
- RS-232 Driver Outputs
R1IN, R2IN
- Receiver Inputs
R1OUT, R2OUT
- Receiver Outputs
C1+, C1-
- Capacitor 1 Connections
C2+, C2-
- Capacitor 2 Connections
DESCRIPTION
The DS232A is a dual RS-232 driver/receiver pair that generates RS-232 voltage levels from a single +5-
volt power supply. Additional
±12-volt supplies are not needed since the DS232A uses on-board charge
pumps to convert the +5-volt supply to
±10 volts. The DS232A is fully compliant with EIA RS-232E and
V.28/V.24 standards. The DS232A contains two drivers and two receivers. Driver slew rates and data
rates are guaranteed up to 250k bits/sec. The DS232A operates with only 0.1
μF charge pump capacitors.
OPERATION
The diagram in Figure 1 shows the main elements of the DS232A. The following paragraphs describe the
function of each pin.
DS232A
Dual RS-232 Transmitter/Receiver
www.maxim-ic.com
16-Pin DIP AND SOIC
15
C1-
C2-
T2OUT
R2IN
VCC
R1IN
R1OUT
T1IN
T2IN
R2OUT
1
2
3
4
5
6
7
8
16
14
13
12
11
10
9
V+
C2+
V-
C1+
GND
T1OUT
20-Pin TSSOP
19
C1-
NC
V-
NC
T2OUT
R2IN
NC
T1OUT
R1IN
R1OUT
NC
T1IN
T2IN
R2OUT
1
2
3
4
5
6
7
8
9
10
20
18
17
16
15
14
13
12
11
V+
C2+
C2-
C1+
VCC
GND