DS229 DS229 Triple RS-232 Transmitter/Receiver FEATURES PIN ASSIGNMENT * Compatible with DS1229 C1+ 1 20 VCC V+ 2 19 GND C1- 3 18 T1OUT C2+ 4 17 R1IN C2- 5 16 R1OUT V- 6 15 T1IN * Operate from single +5V power T2OUT 7 14 T2IN * Meets all EIA-232E and V.28 specifications R2IN 8 13 R2OUT T3OUT 9 12 T3IN 10 11 R3OUT * 5V operation * 20-pin DIP or SOIC package * 20-pin TSSOP package for height restricted applications * Uses small capacitors: 0.1 F R3IN 20-PIN DIP, SOIC AND TSSOP * Optional industrial temperature range available (-40C to +85C) PIN DESCRIPTION ORDERING INFORMATION DS229 DS229N DS229S DS229SN DS229E DS229EN 20-pin DIP 20-pin DIP (Industrial) 20-pin SOIC 20-pin SOIC (Industrial) 20-pin TSSOP 20-pin TSSOP (Industrial) VCC GND V+ V- T1IN, T2IN, T3IN T1OUT, T2OUT, T3OUT R1IN, R2IN, R3IN R1OUT, R2OUT, R3OUT 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 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 F charge pump capacitors. OPERATION The diagram in Figure 1 shows the main elements of the DS229. The following paragraphs describe the function of each pin. 021998 1/9 DS229 FUNCTIONAL DIAGRAM OF DS229 Figure 1 +5V INPUT + + C5 C3 20 + C1+ 3 + VCC 1 4 5 V+ 2 +10V +5V TO +10V VOLTAGE DOUBLER C1- C2+ +10V TO -10V VOLTAGE INVERTER C2- V- 6 -10V + C4 +5V 400k 15 T1IN T1OUT 18 T2OUT 7 T3OUT 9 +5V 400k TTL/CMOS INPUTS 14 T2IN RS-232 OUTPUTS +5V 400k 12 16 T3IN R1OUT R1IN 17 5k TTL/CMOS OUTPUTS 13 R2OUT R2IN 8 5k 11 R3OUT R3IN 5k GND 19 NOTE: C5 is a recommended decoupling capacitor which is the same value as C1, C2, C3, and C4. 021998 2/9 10 RS-232 INPUTS DS229 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 F. A larger capacitor (up to 10 F) can be used to reduce supply ripple. V-: Negative supply output (RS-232). V- requires an external storage capacitor of at least 0.1 F. A larger capacitor (up to 10 F) can be used to reduce supply ripple. T1IN, T2IN, T3IN: Standard TTL/CMOS inputs for the RS-232 drivers. The inputs of unused drivers can be left unconnected since each input has a 400 k pull-up resistor. T1OUT, T2OUT, T3OUT: Driver outputs at RS-232 levels. Driver output swing meets RS-232 levels for loads up to 3 k. 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 protected 5 k 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 F minimum, 10 F 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 CONVERTERS The 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 F. Larger capacitors (up to 10 F) can be used to reduce supply ripple. RS-232 DRIVERS The 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 k pull-up 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 volt driving a 3 k 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 k 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/s. Typical slew rates are 20 volts/s unloaded and 12 volts/s with 3 k and 2500 pF load. These slew rates allow for bit rates of over 116 kbits/s. Driver outputs maintain high impedance when power is off. RS-232 RECEIVERS The three receivers conform fully to the RS-232E specifications. The input impedance is typically 5 k 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 and -25 volts. 021998 3/9 DS229 ABSOLUTE MAXIMUM RATINGS* Absolute Maximum Ratings VCC V+ V- -0.3V to +7.0V (VCC-0.3V) to +14V +0.3V to -14V Input Voltages TIN RIN -0.3V to (VCC+0.3V) 30V Output Voltages TOUT ROUT Short Circuit Duration, TOUT (V+ + 0.3V) to (V- - 0.3V) -0.3V to (VCC + 0.3V) Continuous * This 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 PARAMETER Operating Supply Votlage SYMBOL MIN VCC 4.5 (0C to 70C) TYP MAX UNITS NOTES 5.5 V 1 DC ELECTRICAL CHARACTERISTICS PARAMETER SYMBOL (0C to 70C) MIN TYP MAX UNITS 15 mA Power Supply Current (No Load) ICC1 6 Power Supply Current (3 k Load All Outputs) ICC2 22.5 mA NOTES RS-232 Transmitters Output Voltage Swing VORS 5 8 V Input Logic Threshold Low VTTL 0.8 1.4 V Input Logic Threshold High VTTH 1.4 2.0 V Data Rate fD 200 116 kbits/s Logic Pull-up/Input Current IPU 5 40 A Transmitter Output Resistance ROUT 300 10M Output Short-Circuit Current ITSC 15 30 021998 4/9 100 2 3 mA 4 DS229 DC ELECTRICAL CHARACTERISTICS (continued) (0C to 70C) RS-232 Receivers VIR 25 30 V RS-232 Input Threshold Low VRTL 0.8 1.3 V RS-232 Input Threshold High VRTH RS-232 Input Hysteresis VHY RS-232 Input Resistance RIN RS-232 Input Voltage Operating Range 1.8 2.4 V 0.2 0.5 1 V 3 5 7 k 0.2 0.4 V 5 6 TTL/CMOS Output Voltage Low VROL TTL/CMOS Output Voltage High VROH 3.5 VCC-0.2 V TTL/CMOS Output Short Circuit Current (VOUT=GND) IRSC -2 -10 mA TTL/CMOS Output Short Circuit Current (VOUT=VCC) IRSC 10 30 mA SYMBOL MIN TYP MAX UNITS NOTES tSR 6 12 30 V/s 7 AC ELECTRICAL CHARACTERISTICS PARAMETER Transition Slew Rate (0C to 70C) Transmitter Propagation Delay TTL to RS-232 tPHLT tPLHT 1.3 1.5 3.5 3.5 s s Receiver Propagation Delay RS-232 to TTL tPHLR tPLHR 0.5 0.6 1 1 s s Transmitter + to - Propagation Delay Difference tPHLT -tPLHT 300 ns Receiver + to - Propagation Delay Difference tPHLR -tPLHR 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 = 25C. 021998 5/9 DS229 TRANSMITTER PROPAGATION DELAY TIMING Figure 2 +3V INPUT 0V V+ 0V OUTPUT V- tPLHT tPHLT RECEIVER PROPAGATION DELAY TIMING Figure 3 +3V 0V INPUT -3V OUTPUT VCC 50% 50% GND tPHLR 021998 6/9 tPLHR DS229 20-PIN DIP (300 MIL) B 1 A D E C F K G PKG J H 20-PIN DIM MIN MAX A IN. MM 0.970 24.63 1.040 26.42 B IN. MM 0.240 6.09 0.270 6.86 C IN. MM 0.120 3.05 0.140 3.56 D IN. MM 0.295 7.49 0.325 8.26 E IN. MM 0.015 0.38 0.040 1.02 F IN. MM 0.120 3.04 0.140 3.56 G IN. MM 0.090 2.23 0.110 2.79 H IN MM 0.310 7.87 0.390 9.91 J IN MM 0.008 0.20 0.012 0.30 K IN. MM 0.015 0.38 0.021 0.53 021998 7/9 DS229 20-PIN SOIC (300 MIL) N e b E1 H 1 D C A2 A1 PKG 20-PIN DIM MIN MAX A IN. MM 0.094 2.39 0.105 2.67 A1 IN. MM 0.004 0.102 0.012 0.30 A2 IN. MM 0.089 2.26 0.095 2.41 b IN. MM 0.013 0.33 0.020 0.51 C IN. MM 0.009 0.229 0.013 0.33 D IN. MM 0.498 12.65 0.511 12.99 e IN. MM 0.050 BSC 1.27 BSC E1 IN MM 0.290 7.37 0.300 7.62 H IN MM 0.398 10.11 0.416 10.57 L IN. MM 0.016 0.40 0.040 1.02 0 8 021998 8/9 A L DS229 20-PIN TSSOP D n E H SEE DETAIL A c B e1 A2 A A1 phi G L DETAIL A DIM MIN A MM - A1 MM 0.05 - A2 MM 0.75 1.05 C MM 0.09 0.18 L MM 0.50 0.70 e1 MM MAX 1.10 0.65 BSC B MM 0.18 0.30 D MM 6.40 6.90 E MM 4.40 NOM G MM 0.25 REF H MM phi 6.25 6.55 0 8 021998 9/9