DS232A
Dual RS-232 Transmitter/Receiver
www.dalsemi.com
FEATURES
PIN ASSIGNMENT
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 V0.28 specifications
Uses small capacitors: 0.1 µF
Optional industrial temperature range
available (-40°C to +85°C)
C1+
V+
C1C2+
C2VT2OUT
R2IN
16
15
14
13
12
11
10
9
VCC
GND
T1OUT
R1IN
R1OUT
T1IN
T2IN
R2OUT
16-Pin DIP AND SOIC
C1+
V+
C1C2+
NC
C2VNC
T2OUT
R2IN
ORDERING INFORMATION
DS232A
DS232A-N
DS232AR
DS232AR-N
DS232AS
DS232AS-N
DS232AE
DS232AE-N
1
2
3
4
5
6
7
8
16-pin DIP
16-pin DIP (Industrial)
16-pin SOIC (150-Mil)
16-pin SOIC (150-Mil) (Industrial)
16-pin SOIC (300-Mil)
16-pin SOIC (300-Mil) (Industrial)
20-pin TSSOP
20-pin TSSOP (Industrial)
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
NC
VCC
GND
T1OUT
R1IN
R1OUT
NC
T1IN
T2IN
R2OUT
20-Pin TSSOP
PIN DESCRIPTION
VCC
GND
V+
VT1IN, T2IN
T1OUT, T2OUT
R1IN, R2IN
R1OUT, R2OUT
C1+, C1C2+, C2-
- +5-Volt Supply
- Ground
- Positive Supply Output
- Negative Supply Output
- RS-232 Driver Inputs
- RS-232 Driver Outputs
- Receiver Inputs
- Receiver Outputs
- Capacitor 1 Connections
- Capacitor 2 Connections
DESCRIPTION
The DS232A is a dual RS-232 driver/receiver pair that generates RS-232 voltage levels from a single +5volt 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
V0.28/V0.24 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.
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