DS232A+ ,Dual RS-232 Transmitter/Receiverapplications INT2 T2OUT 7 10 IN Operate from single +5V powerR2IN 8 9 R2OUT Meets all EIA-232E an ..
DS232AE ,Dual RS-232 Transmitter/Receiverapplications INT2 T2OUT 7 10 IN Operate from single +5V powerR2IN 8 9 R2OUT Meets all EIA-232E an ..
DS232AR ,Dual RS-232 Transmitter/ReceiverPIN DESCRIPTIONDS232AE-N 20-pin TSSOP (Industrial)V - +5-Volt SupplyCCGND - GroundV+ - Positive Sup ..
DS232AR ,Dual RS-232 Transmitter/ReceiverDS232ADual RS-232 Transmitter/Receiverwww.dalsemi.com
DS232AR ,Dual RS-232 Transmitter/ReceiverPIN DESCRIPTIONDS232AE-N 20-pin TSSOP (Industrial)V - +5-Volt SupplyCCGND - GroundV+ - Positive Sup ..
DS232AS ,Dual RS-232 Transmitter/ReceiverFEATURES PIN ASSIGNMENT Compatible with LT1181A and MAX232AC1+ V1 16 CCV+ 15 GND High data rate - ..
E53NA50 ,NABSOLUTE MAXIMUM RATINGSSymbol Parameter Value UnitV Drain-source Voltage (V =0) 500 VDS GSV 500 VD ..
DS232A+-DS232AS+-DS232AS-N+-DS232AS-NTR+
Dual RS-232 Transmitter/Receiver
FEATURESCompatible with LT1181A and MAX232AHigh data rate - 250 kbits/sec under load16-pin DIP or SOIC package20-pin TSSOP package for height restricted
applicationsOperate from single +5V powerMeets all EIA-232E and V0.28 specificationsUses small capacitors: 0.1 μFOptional industrial temperature range
available (-40°C to +85°C)
ORDERING INFORMATIONDS232A 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 DESCRIPTIONVCC - +5-Volt Supply
GND - Ground
V+ - Positive Supply Output
V- - Negative Supply Output
T1IN, T2IN- RS-232 Driver InputsT1OUT, T2OUT - RS-232 Driver Outputs
R1IN, R2IN - Receiver Inputs
R1OUT, R2OUT - Receiver Outputs
C1+, C1- - Capacitor 1 ConnectionsC2+, C2- - Capacitor 2 Connections
DESCRIPTIONThe 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.
OPERATION16-Pin DIP AND SOIC
C1-
C2-
T2OUT
R2IN
VCC
R1IN
R1OUT
T1IN
T2IN
R2OUT
C2+
C1+
GND
T1OUT
20-Pin TSSOP
C1-
T2OUT
R2IN
T1OUT
R1IN
R1OUT
T1IN
T2IN
R2OUT
C2+
C2-
C1+
VCC
GND
DS232A
FUNCTIONAL DIAGRAM OF DS232A Figure 1NOTE: C5 is a recommended decoupling capacitor which is the same value as C1, C2, C3, and C4.
( ) Are for TSSOP package only.
PIN DESCRIPTIONS
VCC, GND: DC power is provided to the device on these pins. VCC is the +5-volt input.
V+: Positive supply output (RS-232). V+ requires an external storage charge capacitor of at least 0.1 μF.A larger capacitor (up to 10 μF) can be used to reduce supply ripple.
V-: Negative supply output (RS-232). V- requires an external storage capacitor of at least 0.1 μF. A
larger capacitor (up to 10 μF) can be used to reduce supply ripple.
T1IN, T2 IN: Standard TTL/CMOS inputs for the RS-232 drivers. The inputs of unused drivers can be leftunconnected since each input has a 400 kΩ pullup resistor.
DS232A
R1 IN, R2 IN: Receiver inputs. These inputs accept RS-232 level signals (±25 volts) into a protected 5 kΩterminating resistor. Each receiver provides 0.5V hysteresis (typical) for noise immunity.
R1 OUT, R2 OUT: Receiver outputs at TTL/CMOS levels.
C1+, C1-, C2+, C2-: Charge pump capacitor inputs. These pins require two external capacitors (0.1 μFminimum, 10 μF maximum and should be the same size as C3 and C4). Capacitor 1 is connected between
C1+ and C1-. Capacitor 2 is connected between C2+ and C2-. Capacitor C1 can be omitted if +12 volts isconnected directly to V+. Likewise, C2 can be omitted if -12V is connected directly to V-.
DUAL CHARGE PUMP CONVERTERSThe DS232A has a two-stage on-board charge pump circuit that is used to generate ±10 volts from a
single +5-volt supply. In the first stage, capacitor C1 doubles the +5V supply to +10 volts which is then
stored on capacitor C3. The second stage uses capacitor C2 to invert the +10V potential to -10V. This
charge is then stored on capacitor C4. The ±10-volt supplies allow the DS232A to provide the necessaryoutput levels for RS-232 communication. The DS232A will operate with charge pump capacitors as low
as 0.1 μF. Larger capacitors (up to 10 μF) can be used to reduce supply ripple.
RS-232 DRIVERSThe two RS-232 drivers are powered by the internal ±10-volt supplies generated by the on-board charge
pump. The driver inputs are both TTL and CMOS compatible. Each input has an internal 400 kΩ=pullupresistor so that unused transmitter inputs can be left unconnected. The open circuit output voltage swing
is from (V+ - 0.6) to V- volts. Worst case conditions for EIA-232E/V.28 of ±5-volt driving a 3 kΩ=load
and 2500 pF are met at maximum operating temperature and VCC equal to 4.5 volts. Typical voltage
swings of ±8 volts occur when loaded with a nominal 5 kΩ=RS-232 receiver. As required by EIA-232E
and V.28 specifications, the slew rate at the output is limited to less than 30 volts/μs. Typical slew rates
are 20 volts/μs unloaded and 12 volts/μs with 3 kΩ=and 2500 pF load. These slew rates allow for bit rates
of over 250k bits/s. Driver outputs maintain high impedance when power is off.
RS-232 RECEIVERSThe two receivers conform fully to the RS-232E specifications. The input impedance is typically 5
kΩ=and can withstand up to ±25 volts with or without VCC applied. The input switching thresholds are
within the ±3-volt limit of RS-232E specification with an input threshold low of 0.8 volts and an input
threshold high of 2.4 volts. The receivers have 0.5 volts of hysteresis (typical) to improve noise rejection.
The TTL/CMOS compatible outputs of the receivers will be low whenever the RS-232 input is greaterthan 2.4 volts. The receiver output will be high when the input is floating or driven between +0.8 volts
and -25 volts.
DS232A
ABSOLUTE MAXIMUM RATINGS*Absolute Maximum Ratings
VCC -0.3V to +7.0V
V+ (VCC-0.3V) to +14V
V- +0.3V to -14V
Input Voltages
TIN-0.3V to (VCC+0.3V)
RIN±30V
Output Voltages
TOUT(V+ + 0.3V) to (V- - 0.3V)
ROUT-0.3V to (VCC+ 0.3V)
Short Circuit Duration, TOUT ContinuousThis is a stress rating only and functional operation of the device at these or any other conditions
above those indicated in the operation sections of this specification is not implied. Exposure to
absolute maximum rating conditions for extended periods of time may affect reliability.
RECOMMENDED DC OPERATING CONDITIONS (0°C to 70°C)
DC ELECTRICAL CHARACTERISTICS (0°C to 70°C)
DS232A
DC ELECTRICAL CHARACTERISTICS (continued) (0°C to 70°C)
AC ELECTRICAL CHARACTERISTICS (0°C to 70°C)
NOTES:1. All voltages are referenced to ground.
2. All transmitter outputs loaded with 3 kΩ=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 kΩ=- 7 kΩ; VCC = 5V; TA = 25°C.
DS232A
TRANSMITTER PROPAGAION DELAY TIMING Figure 2
RECEIVER PROPAGATION DELAY TIMING Figure 3
