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PDF DS232AS-N Data sheet ( Hoja de datos )

Número de pieza DS232AS-N
Descripción Dual RS-232 Transmitter/Receiver
Fabricantes Dallas Semiconducotr 
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www.dalsemi.com
DS232A
Dual RS-232 Transmitter/Receiver
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
C1+
V+
C1-
C2+
C2-
V-
T2OUT
R2IN
1
2
3
4
5
6
7
8
16 VCC
15 GND
14 T1OUT
13 R1IN
12 R1OUT
11 T1IN
10 T2IN
9 R2OUT
Uses small capacitors: 0.1 µF
16-Pin DIP AND SOIC
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)
C1+
V+
C1-
C2+
NC
C2-
V-
NC
T2OUT
R2IN
1
2
3
4
5
6
7
8
9
10
20 NC
19 VCC
18 GND
17 T1OUT
16 R1IN
15 R1OUT
14 NC
13 T1IN
12 T2IN
11 R2OUT
DS232AS 16-pin SOIC (300-Mil)
20-Pin TSSOP
DS232AS-N 16-pin SOIC (300-Mil) (Industrial)
DS232AE 20-pin TSSOP
DS232AE-N 20-pin TSSOP (Industrial)
PIN DESCRIPTION
VCC
GND
- +5-Volt Supply
- Ground
V+ - Positive Supply Output
V- - Negative Supply Output
T1IN, T2IN
T1OUT, T2OUT
- RS-232 Driver Inputs
- RS-232 Driver Outputs
R1IN, R2IN
R1OUT, R2OUT
C1+, C1-
- Receiver Inputs
- Receiver Outputs
- 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
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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DS232AS-N pdf
DC ELECTRICAL CHARACTERISTICS (continued)
RS-232 Receivers
RS-232 Input Voltage Operating Range
VIR
±25 ±30
RS-232 Input Threshold Low
VRTL 0.8 1.3
RS-232 Input Threshold High
VRTH
1.8
RS-232 Input Hysteresis
VHY 0.2 0.5
RS-232 Input Resistance
RIN 3 5
TTL/CMOS Output Voltage Low
VROL
0.2
TTL/CMOS Output Voltage High
VROH
3.5 VCC-0.2
TTL/CMOS Output Short Circuit
Current (VOUT=GND)
IRSC -2 -10
TTL/CMOS Output Short Circuit
Current (VOUT=VCC)
IRSC 10 30
2.4
1
7
0.4
DS232A
(0°C to 70°C)
V
V
V
V
k
V5
V6
mA
mA
AC ELECTRICAL CHARACTERISTICS
PARAMETER
SYMBOL
Transition Slew Rate
tSR
Transmitter Propagation
Delay TTL to RS-232
tPHLT
tPLHT
Receiver Propagation
Delay RS-232 to TTL
tPHLR
tPLHR
Transmitter + to - Propagation
Delay Difference
tPHLT
-tPLHT
Receiver + to - Propagation
Delay Difference
tPHLR
-tPLHR
MIN
6
(0°C to 70°C)
TYP MAX UNITS NOTES
12 30 V/µs
7
1.3 3.5 µs
1.5 3.5 µs
0.5 1 µs
0.6 1 µs
300 ns
100 ns
NOTES:
1. All voltages are referenced to ground.
2. All transmitter outputs loaded with 3 k=to ground
3. VCC = V+ = V- = 0V; VOUT = ±2V.
4. VOUT = 0V.
5. IOUT = 3.2 mA.
6. IOUT = -1.0 mA.
7. CL = 50 pF - 2500 pF; RL = 3 k=- 7 k; VCC = 5V; TA = 25°C.
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