DS232A
Dual RS-232 Transmitter/Receiver
www.dalsemi.com
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 V0.28 specifications
Uses small capacitors: 0.1
µF
Optional industrial temperature range
available (-40°C to +85°C)
PIN ASSIGNMENT
C1+
V+
C1-
C2+
C2-
V-
T2
OUT
R2
IN
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
V
CC
GND
T1
OUT
R1
IN
R1
OUT
T1
IN
T2
IN
R2
OUT
16-Pin DIP AND SOIC
C1+
V+
C1-
C2+
NC
C2-
V-
NC
T2
OUT
R2
IN
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
NC
V
CC
GND
T1
OUT
R1
IN
R1
OUT
NC
T1
IN
T2
IN
R2
OUT
ORDERING INFORMATION
DS232A
DS232A-N
DS232AR
DS232AR-N
DS232AS
DS232AS-N
DS232AE
DS232AE-N
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)
20-Pin TSSOP
PIN DESCRIPTION
V
CC
GND
V+
V-
T1
IN
, T2
IN
T1
OUT
, T2
OUT
R1
IN
, R2
IN
R1
OUT
, R2
OUT
C1+, C1-
C2+, 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 +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
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.
1 of 10
112099
DALLAS [ DALLAS SEMICONDUCTOR ]
