DS229EN+ ,Triple RS-232 Transmitter/ReceiverFEATURES PIN ASSIGNMENT Compatible with DS1229VC1+ 1 20 CCV+ 19GND 5V operation 2C1-3 18 T1OUT 2 ..
DS229N ,Triple RS-232 Transmitter/Receiverapplications V- T1INT2T2OUT 7 14 IN Operate from single +5V powerR2 8 13IN R2OUT Meets all EIA-23 ..
DS229S ,Triple RS-232 Transmitter/ReceiverPIN DESCRIPTIONORDERING INFORMATIONV - +5-Volt SupplyCCDS229 20-pin DIPGND - GroundDS229N 20-pin DI ..
DS229S+ ,Triple RS-232 Transmitter/ReceiverPIN DESCRIPTIONORDERING INFORMATIONV - +5-Volt SupplyCCDS229 20-pin DIPGND - GroundDS229N 20-pin DI ..
DS229SN ,Triple RS-232 Transmitter/ReceiverFEATURES PIN ASSIGNMENT Compatible with DS1229VC1+ 1 20 CCV+ 19GND 5V operation 2C1-3 18 T1OUT 2 ..
DS229SN+ ,Triple RS-232 Transmitter/Receiverapplications V- T1INT2T2OUT 7 14 IN Operate from single +5V powerR2 8 13IN R2OUT Meets all EIA-23 ..
E53NA50 ,NABSOLUTE MAXIMUM RATINGSSymbol Parameter Value UnitV Drain-source Voltage (V =0) 500 VDS GSV 500 VD ..
DS229EN+-DS229S+-DS229SN+
Triple RS-232 Transmitter/Receiver
FEATURESCompatible with DS12295V operation20-pin DIP or SOIC package20-pin TSSOP package for height restricted
applicationsOperate from single +5V powerMeets all EIA-232E and V.28 specificationsUses small capacitors: 0.1 μFOptional industrial temperature range
available (-40°C to +85°C)
ORDERING INFORMATIONDS229 20-pin DIP
DS229N 20-pin DIP (Industrial)
DS229S 20-pin SOICDS229SN 20-pin SOIC (Industrial)
DS229E 20-pin TSSOP
DS229EN 20-pin TSSOP (Industrial)
PIN ASSIGNMENT
PIN DESCRIPTIONVCC - +5-Volt Supply
GND - Ground
V+ - Positive Supply OutputV- - Negative Supply Output
T1IN, T2IN, T3IN - RS-232 Driver Inputs
T1OUT, T2OUT, T3OUT - RS-232 Driver Outputs
R1IN, R2IN, R3IN - Receiver Inputs
R1OUT, R2OUT, R3OUT - Receiver OutputsC1+, C1- - Capacitor 1 Connections
C2+, C2- - Capacitor 2 Connections
DESCRIPTIONThe DS229 is a triple 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 DS229 uses on-board charge
pumps to convert the +5-volt supply to ±10 volts. The DS229 is fully compliant with EIA RS-232E and
V.28/V.24 standards. The DS229 contains three drivers and three receivers. Driver slew rates and data
rates are guaranteed up to 116 kbits/sec. The DS229 operates with only 0.1 μF charge pump capacitors.
OPERATIONThe diagram in Figure 1 shows the main elements of the DS229. The following paragraphs describe the
function of each pin.
DS22920-Pin DIP, SOIC AND TSSOP
C1-
C2-
T2OUT
R2IN
T3OUT
R3IN
VCC
R1IN
R1OUT
T1IN
T2IN
R2OUT
T3IN
R3OUT
C2+
C1+
GND
T1OUT
DS229
FUNCTIONAL DIAGRAM OF DS229 Figure 1NOTE: C5 is a recommended decoupling capacitor which is the same value as C1, C2, C3, and C4.
PIN DESCRIPTIONSVCC, 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.
DS229
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, T2IN, T3IN: Standard TTL/CMOS inputs for the RS-232 drivers. The inputs of unused drivers canbe left unconnected since each input has a 400 kΩ pullup resistor.
T1OUT, T2OUT, T3OUT: Driver outputs at RS-232 levels. Driver output swing meets RS-232 levels for
loads up to 3 kΩ. These driver outputs provide current necessary to meet RS-232 levels for loads up to
2500 pF.
R1IN, R2IN, R3IN: Receiver inputs. These inputs accept RS-232 level signals (±25 volts) into a protected5 kΩ terminating resistor. Each receiver provides 0.5V hysteresis (typical) for noise immunity.
R1OUT, R2OUT, R3OUT: 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 is
connected directly to V+. Likewise, C2 can be omitted if -12V is connected directly to V-.
DUAL CHARGE PUMP CONVERTERSThe DS229 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 DS229 to provide the necessary output
levels for RS-232 communication. The DS229 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 three 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=pullup
resistor 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 volts 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 ratesof over 116 kbits/s. Driver outputs maintain high impedance when power is off.
RS-232 RECEIVERSThe three receivers conform fully to the RS-232E specifications. The input impedance is typically 5
kΩ=and can withstand up to ±30 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 greater
than 2.4 volts. The receiver output will be high when the input is floating or driven between +0.8 volts
DS229
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)
DS229
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.
DS229
TRANSMITTER PROPAGATION DELAY TIMING Figure 2
RECEIVER PROPAGATION DELAY TIMING Figure 3
